CN100530319C - Display device with time-multiplexed LED light source - Google Patents

Display device with time-multiplexed LED light source Download PDF

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Publication number
CN100530319C
CN100530319C CNB2005800397602A CN200580039760A CN100530319C CN 100530319 C CN100530319 C CN 100530319C CN B2005800397602 A CNB2005800397602 A CN B2005800397602A CN 200580039760 A CN200580039760 A CN 200580039760A CN 100530319 C CN100530319 C CN 100530319C
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China
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light
led matrix
led
polarization
display device
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CNB2005800397602A
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CN101061530A (en
Inventor
M·P·C·M·克里恩
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Koninklijke Philips NV
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Koninklijke Philips Electronics NV
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/3413—Details of control of colour illumination sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
    • G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
    • G02B26/10—Scanning systems
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/1006—Beam splitting or combining systems for splitting or combining different wavelengths
    • G02B27/102—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources
    • G02B27/1046—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with transmissive spatial light modulators
    • G02B27/1053—Beam splitting or combining systems for splitting or combining different wavelengths for generating a colour image from monochromatic image signal sources for use with transmissive spatial light modulators having a single light modulator for all colour channels
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/145—Beam splitting or combining systems operating by reflection only having sequential partially reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/14—Beam splitting or combining systems operating by reflection only
    • G02B27/149—Beam splitting or combining systems operating by reflection only using crossed beamsplitting surfaces, e.g. cross-dichroic cubes or X-cubes
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0235—Field-sequential colour display
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0237—Switching ON and OFF the backlight within one frame

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Nonlinear Science (AREA)
  • Multimedia (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Chemical & Material Sciences (AREA)
  • Mathematical Physics (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Liquid Crystal (AREA)
  • Projection Apparatus (AREA)

Abstract

A display device (100) has a time-multiplexed a light source (110, 200) including at least two light emitting diode (LED) devices (210, 220) that operate sequentially, and a light combiner (230, 630, 830) that outputs light from the LED devices (210, 220), the light having a first polarization when a first one of the LED devices (210) is turned on, and having a second polarization (220) when a second one of the LED devices is turned on; and a light modulator (122) that receives the light from the light combiner (230, 630, 830). The light modulator (122) and is driven to white when the first LED device (210) is turned on, and is driven to black when the second LED device (220) is turned on.

Description

Display device with time-multiplexed LED light source
Technical field
The present invention relates to field of display devices, particularly relate to a kind of light source that is used for liquid crystal indicator.
Background technology
Light emitting diode (LED) is often used as for example light source of LCD (LCD) device of some display device.LED is little because of its size, fiduciary level is high and the life-span long from but required light source.
Simultaneously, maximum brightness level is a display device, particularly the key character of projection display equipment.Projection display equipment has the very big image of indoor demonstration of sufficient relatively surround lighting through being everlasting, the intensity level of Projection Display is important feature in this case.Certainly, the high-high brightness that gets of projection display equipment is controlled by the brightness of employed light source.
Correspondingly, people are going in for the study and the intensity level developed to improve LED reaches the appropriate level that can be used for projection display equipment.
Yet, it has been found that as LED will descend in the light output of work LED during heating.In US 2003/0218723 A1, this is to allow each LED all have the time of not launching to solve on the movable part by LED is placed on, wherein LED is an illumination condition in the short period with respect to the lighting position of movable part the time, is non-illumination condition with respect to the non-lighting position of movable part the time.Therefore, LED can not become warm to the degree that the light emission declines to a great extent.Yet the problem that disclosed method exists among US 20,03/,021 8723 A1 is that mobile part means and has various mechanical constraint.In addition, the moving structure of manufacturing machine complexity also is a problem.
Correspondingly, people need provide a kind of display device that the led light source of time-multiplex (time-multiplexed) is arranged.People also need to provide at least two of a kind of uses to replace the light source that is used for display device of radiative LED matrix.People further need provide following display and light source, and this display and light source can be used a plurality of monochromatic LEDs in each LED matrix.
Summary of the invention
In one aspect of the present invention, a kind of projection display equipment, this device comprises light source, liquid crystal indicator and driving circuit, this light source comprises that being suitable for replacing luminous first and second light emitting diodes (LED) installs and polarization beam apparatus, this polarization beam apparatus is suitable for receiving from the light of first LED matrix at first light incident surface and receives light from second LED matrix with going into firing table at second vertical with the first light incident surface basically light, and output is from the light with first polarization of first LED matrix when first LED matrix is opened, and output is from the light with second polarization of second LED matrix when second LED matrix is opened; This liquid crystal indicator has and is suitable for receiving from the light output of polarization beam apparatus and a plurality of pixels of the modulation polarisation of light that receives; This driving circuit is suitable for providing data-signal also further to be suitable for providing inverted data signal to the pixel of liquid crystal indicator when second LED matrix is opened to the pixel of liquid crystal indicator when first LED matrix is opened.
In the present invention on the other hand, a kind of display device comprises light source, optical mixer and photomodulator, this light source comprises at least two light emitting diode (LED) devices that are suitable for sequential working, this optical mixer is suitable for exporting the light from a plurality of LED matrix, this light has first polarization and when second unlatching of LED matrix, this light has second polarization when first of LED matrix opened; This photomodulator is suitable for receiving being driven from the light output of optical mixer and when first of LED matrix opened to be black and to be driven when second unlatching of LED matrix and is white in color.
Description of drawings
Accompanying drawing 1 has shown the projection display equipment that time-multiplexed LED light source is arranged;
Accompanying drawing 2 has shown the exemplary time-multiplexed LED light source in the projection display equipment that can be applied in accompanying drawing 1;
Accompanying drawing 3 has shown the first optional LED matrix in the time-multiplexed LED light source that can be used in accompanying drawing 2;
Accompanying drawing 4 has shown the second optional LED matrix in the time-multiplexed LED light source that can be used in accompanying drawing 2;
Accompanying drawing 5 has shown the 3rd optional LED matrix in the time-multiplexed LED light source that can be used in accompanying drawing 2;
Accompanying drawing 6 has shown first embodiment of polarization conversion system;
Accompanying drawing 7 has shown second embodiment of polarization conversion system;
Accompanying drawing 8 has shown the schematic time-multiplexed LED light source of the projection display system that can be used to accompanying drawing 1, has comprised the polarization system.
Embodiment
Accompanying drawing 1 has shown projection display system 100, comprises time-multiplexed LED light source 110, visual maker 120 and projection optical device 130, controller 140 and display screen 150.
Advantageously, this time-multiplexed LED light source 110 comprises a plurality of LED matrix, and these devices are configured to sequentially luminous.LED in the time-multiplexed LED light source 110 is each adapted under the duty cycle that reduces and works, and comparing their light of each emission with continuous working (100% duty cycle) thus all has higher brightness.
Accompanying drawing 2 has shown the exemplary embodiment of the time-multiplexed LED light source 200 of the system 100 that can be used for accompanying drawing 1.Light source 200 comprises first and second LED matrix 210,220 and is suitable for mixing and exports polarisation of light beam splitter (PBS) 230 from first and second LED matrix 210,220.Advantageously, the white light of each LED matrix 210,220 emitting bright in the embodiment of accompanying drawing 2 demonstrations.In the embodiment that accompanying drawing 2 shows, each all comprises a White LED first and second LED matrix 210,220.Yet LED matrix 210,220 also can each all comprise a plurality of White LEDs, and wherein all LED of given LED matrix are in the opening and closing each other of identical time.
Get back to accompanying drawing 1 once more, advantageously, visual maker 120 comprises photomodulator 122 and analyzer 124.Advantageously, photomodulator 122 is the liquid crystal panels that show (LCD) device as twisted nematic liquid crystal.Photomodulator 122 comprises a plurality of addressable pixel.Analyzer 124 is polarizing filters that the transmittance polarization direction is arranged.
Controller 140 comprises driving circuit 142, and driving circuit has pixel address and is used for the data-driven assembly of addressing and provides video data to drive the pixel of photomodulator 122 to the pixel of photomodulator 122.Controller 140 also comprises the circuit of the photogenerated of control time multiplexed LED light source 110.More particularly, controller 140 provide signal suitable time open or shut-in time multiplexed LED light source 110 in LED so that they are sequentially alternately luminous, thereby also reduced the duty cycle of each LED and correspondingly increased the brightness that each LED exports light.
The at first work of interpretation time multiplexed LED light source 200.First and second LED matrix 210,220 are configured to alternation to send light.That is to say that first and second LED matrix 210,220 duty cycle with about 50% under certain frequency is switched between opening and closed condition.When of first and second LED matrix 210,220 is when opening, another is closed exactly, and vice versa.When first LED matrix 210 is unlatching, polarization beam apparatus 230 receives from the light of first LED matrix 210 and the light of first LED matrix 210 of first (for example, " p ") polarization is arranged by light exit surface 236 outputs at first light incident surface 232.Simultaneously, when second LED matrix 220 is unlatching, polarization beam apparatus 230 receives from the light of second LED matrix 220 and by light exit surface 236 outputs at second light incident surface 234 light from second LED matrix 220 of second (for example, " s ") polarization of first (P) polarization orthogonal together.Correspondingly, time-multiplexed LED light source 200 is exported the polarized light that replaces between mutually perpendicular first (p) and second (s) polarization.
In addition, when need be under specific frame speed during display video, can open one of LED matrix 210,220 and open another of LED matrix 210,220 in the time in the time in even frame in odd-numbered frame.
The work of the display system 100 of accompanying drawing 1 will be with reference to the accompanying drawings the embodiment of 2 time-multiplexed LED light source 200 illustrate.
Light source 110 provides polarized light to visual maker 120.More particularly, as described in accompanying drawing 2, light source 110 provides the light of first (for example, " p ") polarization when first LED matrix is unlatching, provides second (for example, " s ") light of polarization when second LED matrix is unlatching.
In the work, the polarized light that photomodulator 122 receives from light source 100.Thereby the pixel of photomodulator 122 changes the polarisation of light light modulated that receives from light source 110 alternatively obtains required image.When photomodulator 122 is TN-LCD, there be not pixel or video data voltage to supply with under the situation of pixel, then pixel rotation or change are at polarisation of light 90 degree of this pixel place reception.On the other hand, when video or pixel data voltage were applied to the pixel of TN-LCD photomodulator 122, the rotation of the light polarization of this pixel or change just had been suppressed.
Simultaneously, the light transmissive polarization direction of analyzer 124 is with identical from first (p) polarization of the light of light source 110 or vertical second (s) polarization.For example, when the polarization direction of analyzer 124 is first (p) polarization, there is the light of first (p) polarization just can stop light simultaneously by analyzer 124 to projection optical device 130 from vertical second (s) polarization of having of light source 110.
In following discussion, the polarization direction of supposing analyzer 124 is second (s) polarization.
As mentioned above, in the time interval, when first LED matrix 210 was unlatching, the light that outputs to photomodulator 122 from light source 110 had first (for example, " p ") polarization.In these time intervals, if do not have video or pixel data voltage to be applied to pixel, so pixel will rotate or change have first (p) polarization the polarisation of light that receives 90 degree so that it has vertical second (s) polarization when leaving photomodulator 122.Correspondingly, from not having video or pixel data voltage to be applied to the light of the pixel on it through there being the analyzer 124 of second (s) polarization to be supplied to projection optical device 130.On the other hand, if video or pixel data voltage are applied to pixel, rotation or the change for the polarisation of light that first (p) polarization is arranged will be suppressed at the pixel place so.At this moment, will there be the analyzer 124 of second (s) polarization to stop from the light that has video or pixel data voltage to be applied to the pixel on it or be blocked so that this pixel presents dark in display or be black.The mode of this operational light modulator 122 is known as " driving blackening " or " Chang Bai " mode.
Simultaneously, in the time interval, when second LED matrix 220 was unlatching, the light that outputs to photomodulator 122 from light source 110 had second (for example, " s ") polarization.In these time intervals, if if do not have video or pixel data voltage to be applied to pixel, so pixel will rotate or change have second (s) polarization the polarisation of light that receives 90 degree so that it has vertical first (p) polarization when leaving photomodulator 122.Correspondingly, being had second (s) can not be supplied to projection optical device's 130 these pixels thereby the analyzer of polarization 124 blocks from the light that does not have video or pixel data voltage to be applied to the pixel on it will present dark or black in display.On the other hand, if video or pixel data voltage are applied to pixel, rotation or the change for the polarisation of light that second (s) polarization is arranged will be suppressed at the pixel place so.Correspondingly, will be fed into projection optical device 130 by the analyzer 124 that second (s) polarization is arranged from the light that has video or pixel data voltage to be applied to the pixel on it.The mode of this operational light modulator 122 is known as " driving bleaches " or " normal black " mode.
In brief, when first LED matrix 210 is opened, photomodulator 122 is controlled to be driven and is black (working under the normal white mode) and when second LED matrix 220 was opened, photomodulator 122 was controlled to be driven be white in color (deceive under the pattern often and work).
Controller 140 has been controlled the photogenerated of light source 110 and the image of visual maker 120 generates just synchronously.More properly, when controller 140 was opened the LED of first LED matrix 210, the driving circuit 142 of controller 140 provided video data signal to drive photomodulator 120 blackening to the pixel of the photomodulator 122 that " normally " polarization is arranged.Simultaneously, when controller 140 was opened the LED of second LED matrix 220, the pixel that the driving circuit 142 counter-rotating video data signals of controller 140 also will have the video data signal of the counter-rotating of " counter-rotating " polarization to supply with photomodulator 122 bleached to drive photomodulator 120.
In addition, the image that controller 140 can the control sequence color be cut apart generates, and wherein first (for example, red), second (for example, green) and the 3rd (for example, indigo plant) picture sequences ground generate also demonstration apace, thereby spectators have experienced panchromatic image.At last, accompanying drawing 3 has shown the first optional LED matrix 300, and first and second LED matrix 210,220 that this device can be used for replacing in the time-multiplexed LED light source of accompanying drawing 2 generate with the image that produces sequential color and cut apart.
LED matrix 300 comprises first (for example, red), second (for example, green) and the 3rd (for example, indigo plant) LED310,320 and 330, and first and second dichroic filters 325 and 335.The light of three kinds of LED310,320 and 330 each generation has all been mixed once more by dichroic filter 325 and 335.These optical filters are used in the projector usually and transmission part visible spectrum are arranged and the performance of reflection remaining part.
The embodiment of the LED matrix 300 of accompanying drawing 3 can be extended to more than three kinds of original looks easily.Especially, in order to obtain white light, particularly advantageous is the light that LED launched that mixes single red LED, single blue led and two emission spectrum green portion light.The spectrum of two green LED should not wanted overlapping too many so that can mix their light by dichroic filter.
Accompanying drawing 4 has shown that the LED410,420,430 and 440 that adopts color more than three kinds obtains the second optional LED matrix 400 of white light.Advantageously, LED430 and 440 transmitting green light all.
Accompanying drawing 5 has shown the 3rd optional LED matrix 500, and this device 500 can be used to replace first and second LED matrix 210,220 in the time-multiplexed LED light source of accompanying drawing 2.Device 500 adopts dichroic cube 510 to mix from three LED310,320 and 330 light.
In the light source 200 of accompanying drawing 2, do not arrive the output terminal of light source 200 thereby by PBS 230 time, lost it from half light of the pact of each LED matrix 210,220.More properly, when first LED matrix 210 was unlatching, the s polarized light of first LED matrix 210 was reflected and can not arrive the light exit surface 236 of PBS 230 by PBS 230.Similarly, when second LED matrix 220 was unlatching, the p polarized light of second LED matrix 220 was not reflected and can not arrive the light exit surface 236 of PBS 230 by PBS 230.
Accompanying drawing 6 has shown all photoconductions to a direction and the polarization conversion system (PCS) 600 of unified polarization is arranged.PCS 600 comprises PBS 630, optical coupling element 660 and half-wave ratarder 680.The work of PCS 600 will obtain explanation at this.When first LED matrix 210 was opened, it launched nonpolarized light to PBS630, and PBS 630 reflexes to optical coupling element 660 to output terminal (light exit surface 636) transmission p polarized light and with the s polarized light.Optical coupling element 660 reflexes to half-wave ratarder 680 places with the s polarized light, and delayer 680 converts light to the p polarization.Therefore, all export from all light of first LED matrix 210 with the form of p polarized light.Simultaneously, when second LED matrix 220 was opened, it was to PBS 630 emission nonpolarized lights, PBS 630 to output terminal reflection s polarized light and with the p polarized light transmission to optical coupling element 660.Optical coupling element 660 reflexes to half-wave ratarder 680 places with the p polarized light, and delayer 680 converts light to the s polarization.Therefore, all export from all light of second LED matrix 220 with the form of s polarized light.
Accompanying drawing 7 has shown and has been used for all photoconductions to a direction and second embodiment of the PCS700 of unified polarization is arranged.PCS700 comprises PBS 730, optical coupling element 760 and half-wave ratarder 780.When first LED matrix 210 was opened, it was to PBS 730 emission nonpolarized lights, and PBS 730 reflexes to optical coupling element 760 to delayer 780 transmission s polarized lights and with the p polarized light.Optical coupling element 760 reflexes to output terminal with the p polarized light.Delayer 780 converts the s polarized light to the p polarization.Therefore, all export from all light of first LED matrix 210 with the form of p polarized light.Simultaneously, when second LED matrix 220 was opened, it was to PBS 730 emission nonpolarized lights, PBS 730 to delayer 780 reflection p polarized lights and with the s polarized light transmission to optical coupling element 760.Optical coupling element 760 reflexes to output terminal with the s polarized light.Delayer 780 converts the p polarized light to the s polarization.Therefore, all export from all light of second LED matrix 220 with the form of s polarized light.
The polarization conversion system structure also can be used for arbitrary LEC device of accompanying drawing 3-5.
Accompanying drawing 8 has shown the embodiment of a light source 800, and this light source comprises polarization conversion system 830.Light source 800 is similar with the light source 200 of accompanying drawing 2, except the PBS 230 of accompanying drawing 2 is substituted by the PCS 830 of accompanying drawing 8.That is to say, replace (perhaps except) in each LED matrix 810 and 820, to comprise one or more PCS, mix by PCS 830 from the light of two LED matrix 810,820.The work of light source 800 is the same with the work of the light source 200 of top detailed record.
Although preferred embodiment be disclosed herein, as long as drop in scope of the present invention and the notion, so many changes all are possible.For example, also can be used in three panel display with setting recited above as shown in Figure 2, each panel produces the light modulated with different colours (for example, red, green and blue) in this system.In this case, the light that can be used for the monolithic panel of display system and panel transmission of the setting shown in the accompanying drawing 2 can be by mixing with the similar dichroic cube of the dichroic cube shown in the accompanying drawing 5 again before being applied to projection optical device 130.These changes all are tangible after those skilled in the art read instructions, accompanying drawing and claim.Therefore the present invention is limited in the spirit and scope of claims.

Claims (17)

1, a kind of projection display equipment comprises:
Light source (110,200) comprises,
Be suitable for replacing luminous first and second light emitting diodes (LED) devices (210,220),
Polarization beam apparatus (230,630,830), this polarization beam apparatus is suitable for receiving from the light of first LED matrix (210) and receiving light from second LED matrix with vertical substantially second light incident surface (234) of first light incident surface (232) at first light incident surface (232), and when first LED matrix (210) is opened, export part light from first LED matrix (210) with first polarization, output has the part light from second LED matrix (220) of second polarization when second LED matrix (220) is opened;
Liquid crystal indicator (122), this liquid crystal indicator have and are suitable for receiving from the light output of polarization beam apparatus (230,630,830) and a plurality of pixels of the modulation polarisation of light that receives; And
Driving circuit (142), this driving circuit (142) are suitable for providing data-signal also further to be suitable for providing to the pixel of liquid crystal indicator (122) data-signal of counter-rotating when second LED matrix (220) is opened to the pixel of liquid crystal indicator (122) when first LED matrix (210) is opened;
Described projection display equipment (100) further comprises:
Optical coupling element (660), when first LED matrix (210) is opened, this optical coupling element (660) is suitable for from the light of polarization beam apparatus (630) reception from the second portion with second polarization of first LED matrix (210), and when second LED matrix (220) is opened, this optical coupling element (660) is suitable for from the light of polarization beam apparatus (630) reception from the second portion with first polarization of second LED matrix (220), and when first LED matrix (210) is opened, this optical coupling element (660) is suitable for the light of output from the second portion of first LED matrix (210), with when second LED matrix (220) is opened, this optical coupling element (660) is suitable for the light of output from the second portion of second LED matrix (220); With
Half-wave ratarder (680), when first LED matrix (210) is opened, this half-wave ratarder (680) is suitable for from the light of optical coupling element (660) reception from the second portion of first LED matrix (210), and will convert to from the light of the second portion of first LED matrix (210) and have first polarization, and will output to liquid-crystal apparatus (122) from the second portion light with first polarization of first LED matrix (210), and further when second LED matrix (220) is opened, this half-wave ratarder (680) is suitable for from the second portion light of optical coupling element (660) reception from second LED matrix (220), and will convert to from the second portion light of second LED matrix (220) and have second polarization, and will output to liquid-crystal apparatus (122) from the second portion light with second polarization of second LED matrix (220).
2, the display device of claim 1 (100), wherein when first LED matrix (210) is opened liquid-crystal apparatus (122) be driven be black and when second LED matrix (220) is opened liquid-crystal apparatus (122) be driven and be white in color.
3, the display device of claim 1 (100), wherein each of first and second LED matrix (210,220) all comprises a plurality of LED of each self-emission white light.
4, the display device of claim 1 (100), wherein each of first and second LED matrix (210,220,300,400,500) all comprises:
Be suitable for launching a LED (310,410) of first coloured light;
Be suitable for launching the 2nd LED (320,420) of second coloured light;
Be suitable for launching the 3rd LED (330,430) of the 3rd coloured light.
5, the display device of claim 4 (100), wherein each of first and second LED matrix (210,220,400) all further comprises the 4th LED (440) that is suitable for launching the 3rd coloured light.
6, the display device of claim 4, wherein each of first and second LED matrix (210,220) all further comprises:
First dichroic filter (325) that is suitable for receiving first coloured light and second coloured light and exports first and second coloured light that mix;
Be suitable for receiving first coloured light and second coloured light of mixing, second dichroic filter (335) of first, second that receives that the 3rd coloured light and output mixes and the 3rd coloured light.
7, the display device of claim 1 (100) further comprises analyzer (124), and this analyzer (124) is suitable for transmission to be had the light of first polarization and stop the light that second polarization is arranged.
8, a kind of display device (100) comprising:
Light source (110,200) comprising:
At least two light emitting diode (LED) devices (210,220) that are suitable for sequential working and
Be suitable for the optical mixer (230,630,830) of output from the light of LED matrix (210,220), when opened first (210) of LED matrix, this light had first polarization, and when opened second (220) of LED matrix, this light had second polarization; With
Photomodulator (122), this photomodulator (122) is suitable for receiving the light output from optical mixer (230,630,830), photomodulator (122) is driven and is black when open first (210) of LED matrix, and photomodulator (122) is driven and is white in color when second (220) of LED matrix unlatching.
9, the display device of claim 8, wherein optical mixer (230) is a polarization beam apparatus.
10, the display device of claim 8, wherein optical mixer (630,830) comprises polarization conversion system.
11, the display device of claim 8, wherein each LED matrix (210,220) comprises the LED that launches white light.
12, the display device of claim 8, wherein each LED matrix (210,220) comprises a plurality of LED of each self-emission white light.
13, the display device of claim 8, wherein each LED matrix (210,220,300,400,500) comprising:
Launch a LED (310,410) of first coloured light;
Launch the 2nd LED (320,420) of second coloured light;
Launch the 3rd LED (330,430) of the 3rd coloured light.
14, the display device of claim 13, wherein each of first and second LED matrix (210,220) all further comprises:
First dichroic filter (325), this dichroic filter (325) are suitable for receiving first and second coloured light that first coloured light and second coloured light and output mix; With
Second dichroic filter (335), this dichroic filter (335) is suitable for receiving first and second coloured light of mixing, and receives the 3rd coloured light, and first, second and the 3rd coloured light of output mixing
15, the display device of claim 13 (100), wherein each of first and second LED matrix (210,220,400) all further comprises the 4th LED (440) that is suitable for launching the 3rd coloured light.
16, the display device of claim 8 (100), it further comprises analyzer (124), it is suitable for transmission has the light of first polarization and stops the light that second polarization is arranged.
17, a kind of display device comprises:
Three optical processing systems, each system all is suitable for making the light modulated of different colours, and each photosystem all comprises:
Light source (110,200) comprising:
At least two light emitting diode (LED) devices (210,220) that are suitable for sequential working and
Be suitable for the optical mixer (230,630,830) of output from the light of LED matrix (210,220), when opened first (210) of LED matrix, this light had first polarization, and when second (220) of LED matrix unlatching, this light have second polarization and
Be suitable for receiving photomodulator (122) from the light output of optical mixer (230,630,830), this photomodulator (122) is driven and is black and when second (220) of LED matrix unlatching, this photomodulator (122) is driven and is white in color when opening in first (210) of LED matrix; With
Be suitable for mixing the dichroic cube of light modulated from each of three optical systems.
CNB2005800397602A 2004-11-19 2005-11-16 Display device with time-multiplexed LED light source Expired - Fee Related CN100530319C (en)

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