WO2003107319A1 - Led-based white-light backlighting for electronic displays - Google Patents
Led-based white-light backlighting for electronic displays Download PDFInfo
- Publication number
- WO2003107319A1 WO2003107319A1 PCT/IB2003/002549 IB0302549W WO03107319A1 WO 2003107319 A1 WO2003107319 A1 WO 2003107319A1 IB 0302549 W IB0302549 W IB 0302549W WO 03107319 A1 WO03107319 A1 WO 03107319A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- leds
- white light
- effective
- light guide
- Prior art date
Links
Classifications
-
- 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
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
- H05B45/22—Controlling the colour of the light using optical feedback
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
- H05B45/28—Controlling the colour of the light using temperature feedback
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0606—Manual adjustment
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/0633—Adjustment of display parameters for control of overall brightness by amplitude modulation of the brightness of the illumination source
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0626—Adjustment of display parameters for control of overall brightness
- G09G2320/064—Adjustment of display parameters for control of overall brightness by time modulation of the brightness of the illumination source
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2360/00—Aspects of the architecture of display systems
- G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
- G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display screen
Definitions
- This invention relates in general to a backlight system for a liquid crystal (LCD) or other electronic display and, in particular, to controlling the color and lumen level of a red-green-blue (RGB) light-emitting diode (LED) backlight and the sensor(s) that control(s) such a backlight.
- LCD liquid crystal
- RGB red-green-blue
- LED light-emitting diode
- RGB LEDs Backlighting with white light generated by RGB LEDs is known to those skilled in the art.
- the characteristics of the LEDs vary with temperature, current, and aging. These characteristics also vary from one LED in a batch to another.
- a feedback control to maintain within set limits the color and lumen level of such a backlighting system.
- sensors must be placed properly to provide the necessary optical feedback.
- the present invention provides apparatus and method for backlighting an electronic display with LEDs to control luminosity, radiometric power, and tristimulus levels by means of feedback control through a microprocessor, thereby maintaining the white backlight at substantially constant levels, which can be chosen by an operator.
- apparatus for backlighting an electronic display with white light comprises: a plurality of light-emitting diodes (LEDs), each of the LEDs effective for emitting light of a single color; at least one light source comprised of at least three of the LEDs arranged in a combination that produces white light; a light guide effective for illuminating the display with the white light; and circuitry effective for maintaining the white light at a substantially constant level of color and luminosity by controlling the at least one light source.
- LEDs light-emitting diodes
- This embodiment of the invention utilizes a method for backlighting an electronic display with white light comprising the steps of: driving a plurality of LEDs, each of the LEDs emitting light of a single color; combining light emitted from at least three of the LEDs to form white light; illuminating the display with the white light; and controlling the color and brightness of the white light by means of feedback circuitry.
- apparatus for backlighting an electronic display with white light comprising means for driving a plurality of LEDs, each of the LEDs emitting light of a single color; means for combining light emitted from at least three of the LEDs to form white light; means for illuminating the display with the white light; means for controlling the color and brightness of the white light by feedback circuitry; and the means for controlling being subject to an operator's direction.
- the present invention addresses one or more of these concerns.
- FIG. 1 illustrates the apparatus of the present invention for backlighting an
- FIG. 2 illustrates the placement of photosensors in a light guide
- FIG. 3 illustrates placement of photosensors in a light guide when only a single side light source is used.
- FIG. 1 there is illustrated an apparatus for controlling white light for substantially uniform backlighting of an LCD 100 or similar display, utilizing a power supply 110, which obtains power from an alternating current source 115.
- Power supply 110 further comprises a plurality of LED drivers 120, 130, 140, one each for red, green, and blue drivers, respectively.
- Each of LED drivers 120, 130, 140 is connected to a plurality of LEDs of the same color, connected in suitable series and parallel combinations, that comprise each of a plurality of light sources 150, 160.
- Light sources 150, 160 are each embedded in a heat sink 190, 200 to avoid overheating of LEDs and maximize uniformity of color. Light sources 150, 160 are in turn mounted on the edges of a light guide 170. Uniformity of color is maintained by forming a unit white cell on each of light sources 150, 160 in a suitable combination of LEDs, such as R-G-B, R-G-B-G, G-R-B, etc., that maximize uniformity of color.
- Optical arrangements couple the light from the LEDs of light sources 150, 160 to light guide 170.
- LED drivers 120, 130, 140 supply current, suitably converted within power supply 110, to the LEDs in light sources 150, 160.
- a microprocessor 180 programmed with the functions necessary to control color and lumen level in light guide 170, provides signals that control the currents from LED drivers 120, 130, 140.
- a plurality of photo sensors 210 send feedback via a circuit 230 to permit microprocessor 180 to vary the signals sent to LED drivers 120, 130, 140. These signals may take the form of amplitude modulation, PWM signals, or other suitable values.
- a controller 240 feeds to microprocessor 180 signals that determine color and brightness levels of an LCD or other electronic display (not shown) backlit by light guide 170.
- Feedback control is required to maintain color and brightness in light guide 170. Without such control, variations in the characteristics of the individual LEDs in light sources 150, 160 will cause the color and brightness in light guide 170 to vary within unacceptable limits.
- the feedback control required depends on taking appropriate samples by sensing.
- temperatures of light sources 150, 160 are sensed within heat sinks 190, 200.
- Microprocessor 180 is programmed to compensate for temperature-related variations in color and brightness in light guide 170 caused by variations in the characteristics of the LEDs in light sources 150, 160. This compensation is effected by adjusting the currents sent by LED drivers 120, 130, 140 to the LEDs. This first embodiment has no mechanism to overcome aging effects in the individual LEDs.
- photo diodes 210 measure at least one of either the lumen level and the radiometric power level in light guide 170 by unfiltered photo diodes, photo diodes with Y filters, or other suitable means.
- Microprocessor 180 is programmed to compensate for variations in color and brightness in light guide 170, caused by variations in the characteristics of the LEDs in light sources 150, 160, by adjusting the currents from LED drivers 120, 130, 140 to the desired levels of lumen and/or radiometric power. This second embodiment cannot overcome variations in color caused by variations in temperature.
- both the temperatures in heat sinks 190, 200 and at least one of either the lumen level or the radiometric power level in light guide 170 are sensed as described in the first and second embodiments and fed to microprocessor 180.
- microprocessor 180 By programming microprocessor 180 to adjust the currents from LED drivers 120, 130, 140 in response to both sets of feedback stimuli, this embodiment of the present invention compensates for both aging and temperature variations in the LEDs in light sources 150, 160.
- photo diodes 210 are fitted with appropriate filters to sense the tristimulus values of the white light in light guide 170.
- tristimulus values (or another measure of color), fed back to a suitably programmed microcomputer 180, adjust the currents of LED drivers 120, 130, 140 to match the tristimulus values for the light in light guide 170 to match reference values.
- temperatures in heat sinks 190, 200 are measured to add temperature compensation to the adjusted tristimulus values referred to in the fourth embodiment.
- the color and lumen level of the white light from light guide 170 can be manually set by an operator or automatically by the control circuitry.
- each of heat sinks 190, 200 has three temperature sensors 250.
- the placement of temperature sensors 250 on heat sinks 190, 200 depends on the latter's temperature profile.
- Feedback control is based on a weighted average of the outputs of temperature sensors 250.
- a minimum of one pair of photo diodes 210 is required by the present invention, but their placement can vary. Referring again to Figure 1, a first embodiment places each of a pair of photo diodes 210 in the middle of each of two sides of light guide 170.
- a second embodiment places photo diodes 210 on the underside of light guide 170, between its body and the reflector below.
- the light in light guide 170 is sensed by at least one set of photo diodes 210, and the average from all of them is used by microprocessor 180.
- Figure 2 shows three sets of photo sensors 260, 270, and 280. They are placed in a row substantially in the middle of a planar light guide 170, with photo sensors 270 in the middle of the row and photo sensors 260, 280 each placed approximately one-quarter of the distance from the side.
- photo sensors 260, 270, 280 may be placed at the opposite edge of light guide 170 from light source 150. They are placed in a row with photo sensors 270 in the middle of the row and photo sensors 260, 280 each placed approximately one-quarter of the distance from the side.
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03732876A EP1516312A1 (en) | 2002-06-17 | 2003-06-05 | Led-based white-light backlighting for electronic displays |
JP2004514052A JP2005530312A (en) | 2002-06-17 | 2003-06-05 | Backlighting of electronic displays with white LED light |
AU2003239305A AU2003239305A1 (en) | 2002-06-17 | 2003-06-05 | Led-based white-light backlighting for electronic displays |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/173,346 | 2002-06-17 | ||
US10/173,346 US6753661B2 (en) | 2002-06-17 | 2002-06-17 | LED-based white-light backlighting for electronic displays |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003107319A1 true WO2003107319A1 (en) | 2003-12-24 |
Family
ID=29733317
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2003/002549 WO2003107319A1 (en) | 2002-06-17 | 2003-06-05 | Led-based white-light backlighting for electronic displays |
Country Status (7)
Country | Link |
---|---|
US (1) | US6753661B2 (en) |
EP (1) | EP1516312A1 (en) |
JP (1) | JP2005530312A (en) |
CN (1) | CN1662949A (en) |
AU (1) | AU2003239305A1 (en) |
TW (1) | TW200406932A (en) |
WO (1) | WO2003107319A1 (en) |
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Also Published As
Publication number | Publication date |
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EP1516312A1 (en) | 2005-03-23 |
US20030230991A1 (en) | 2003-12-18 |
JP2005530312A (en) | 2005-10-06 |
AU2003239305A1 (en) | 2003-12-31 |
US6753661B2 (en) | 2004-06-22 |
TW200406932A (en) | 2004-05-01 |
CN1662949A (en) | 2005-08-31 |
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