CN102542996B - Light-emitting diode (LED) wavelength correcting circuit - Google Patents
Light-emitting diode (LED) wavelength correcting circuit Download PDFInfo
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- CN102542996B CN102542996B CN201010619714.2A CN201010619714A CN102542996B CN 102542996 B CN102542996 B CN 102542996B CN 201010619714 A CN201010619714 A CN 201010619714A CN 102542996 B CN102542996 B CN 102542996B
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Abstract
The invention is applied to the field of light-emitting diodes (LED) display and provides an LED wavelength correcting circuit. The circuit comprises a main passage current source, two auxiliary passage current sources and a current adjusting unit, wherein the main passage current source is used for adjusting the brightness of a main base color; the two auxiliary passage current sources are used for correcting the wavelengths of the main base color; and the current adjusting unit is used for adjusting the current values of the main passage current source and the auxiliary passage current sources according to input current adjusting signals. The main passage current source is used for adjusting the brightness of the main base color, and the two auxiliary passage current sources are used for correcting the wavelengths of the main base color, so the brightness and the wavelength of an LED are consistent, and high fidelity of the color is realized. The technical scheme provided by the invention is easy to realize, is low in cost, and is beneficial for popularization and application in the field.
Description
Technical field
The invention belongs to LED and show field, relate in particular to a kind of LED wavelength circuit for rectifying.
Background technology
At present, LED-backlit shows high with its brightness, and good uniformity and color representation power are strong etc., and advantage will progressively replace LCD product, become the main flow of demonstration backlight.So-called LED-backlit shows it is the multiple LED light emitting diodes that form of arranging with matrix form of current drives by having certain wavelength, and formation has the combination of pixels of three primary colours, thereby the light of different colours is made us outlook and is clipped in generation.And existing LED-backlit demonstration only adopts main channel current source to realize the brightness regulation of fine chrominance primary conventionally, the light of different wave length can produce decay or drift because of environment and the factor such as aging, make LED brightness and wavelength occur difference, cause the deviation of display color, cannot meet the requirement of people to color high fidelity (Hi-Fi).
Summary of the invention
The object of the embodiment of the present invention is to provide a kind of LED wavelength circuit for rectifying, is intended to solve the inconsistent problem of LED-backlit display brightness and wavelength.
The embodiment of the present invention is achieved in that a kind of LED wavelength circuit for rectifying, and described circuit comprises:
Main channel current source, for regulating the brightness of fine chrominance primary;
Two secondary channels current sources, for carrying out wavelength rectification to fine chrominance primary; And
Current regulation unit, for according to the current regulating signal of input, regulates the current value of described main channel current source and described secondary channels current source.
Another object of the embodiment of the present invention is to provide a kind of LED-backlit display driver circuit, comprises LED light emitting diode and signal processor, and described LED-backlit display driver circuit also comprises LED wavelength circuit for rectifying, and described LED wavelength circuit for rectifying comprises:
Main channel current source, for regulating the brightness of fine chrominance primary;
Two secondary channels current sources, for carrying out wavelength rectification to fine chrominance primary; And
Current regulation unit, for according to the current regulating signal of input, regulates the current value of described main channel current source and described secondary channels current source.
The embodiment of the present invention is carried out brightness regulation by main channel current source to fine chrominance primary, by other two primary colours secondary channels current sources, fine chrominance primary is carried out to wavelength rectification, realize brightness and the consistent wavelength of LED, and utilize current regulation unit to regulate the current value of main channel current source and secondary channels current source, greatly improved rectification precision, to realize the high fidelity (Hi-Fi) of color, the technical program easily realizes, cost is low, is beneficial in this field and applies.
Brief description of the drawings
The LED wavelength circuit for rectifying structural drawing that Fig. 1 provides for first embodiment of the invention;
The LED-backlit display device structure figure that Fig. 2 provides for second embodiment of the invention.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The embodiment of the present invention is carried out brightness regulation by main channel current source to fine chrominance primary, by other two primary colours secondary channels current sources, fine chrominance primary is carried out to wavelength rectification, realize brightness and the consistent wavelength of LED, and utilize current regulation unit to regulate the current value of main channel current source and secondary channels current source, realize improving and correct precision.
Below in conjunction with specific embodiment, realization of the present invention is elaborated.
Fig. 1 shows the structural principle of the LED wavelength circuit for rectifying that first embodiment of the invention provides.The LED wavelength circuit for rectifying that the embodiment of the present invention provides comprises:
Main channel current source 11, for regulating the brightness of fine chrominance primary;
Two secondary channels current sources 12, for carrying out wavelength rectification to fine chrominance primary; And
Current regulation unit 13, for according to the current regulating signal of input, regulates the current value of described main channel current source and described secondary channels current source.
Fig. 2 shows the structural principle of the LED-backlit display driver circuit that second embodiment of the invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention.
LED-backlit display driver circuit comprises: signal processor 3 and multiple LED wavelength circuit for rectifying 1.
In embodiments of the present invention, LED-backlit display device comprises multiple combination of pixels, each combination of pixels comprises again blue primary current channel (being B), red primary current channel (being R) and green primary current channel (being G), the current channel of every kind of primary colours can be realized by LED wavelength circuit for rectifying, describes below as an example of blue primary current channel example.
LED wavelength circuit for rectifying 1 comprises: blue main channel current source 21, its positive pole of fine chrominance primary being carried out to brightness regulation connect 15V supply voltage by LED light emitting diode 14, and negative pole connects the output terminal of the gray shade scale driver 2 of corresponding color;
The red secondary channels current source 22 and the green secondary channels current source 23 that fine chrominance primary are carried out to wavelength rectification, its positive pole connects 15V supply voltage by LED light emitting diode 14 respectively, and negative pole connects respectively the output terminal of the gray shade scale driver of corresponding color; And
The current regulation unit 24 that the current value of blue main channel current source 21, red secondary channels current source 22 and green secondary channels current source 23 is regulated, its input end is connected with signal processor 3, input current conditioning signal, its output terminal is connected with the control end of the control end of blue main channel current source 21, red secondary channels current source 22 and the control end of green secondary channels current source 23 respectively.
As one embodiment of the invention, current regulation unit 24 can be electric current register.
In embodiments of the present invention, current regulation unit 24, for storing the current value in each fine chrominance primary channel current source, to realize the setting of LED brightness, brightness other and that set can be by changing the current value adjustment in current adjustment unit.
Current regulation unit 24 is also for storing the current value of secondary channels current source, and to realize the rectification to fine chrominance primary wavelength, and secondary channels current source can be closed in the time that fine chrominance primary does not need to correct.
As one embodiment of the present invention, LED wavelength circuit for rectifying 1 can also comprise gray shade scale driver 2, this gray shade scale driver 2 is for controlling the average current value of blue main channel current source 21, red secondary channels current source 22 and green secondary channels current source 23, and its output terminal is connected with the negative pole of blue main channel current source 21, red secondary channels current source 22 and green secondary channels current source 23.
Gray shade scale driver 2 comprises: pulse-width modulator (being PWM) 25, for the pulse signal of certain dutycycle is provided, control the break-make of described switching tube; And switching tube Q1, utilize the average current value of main channel current source and described secondary channels current source described in break-make control.Wherein, the output terminal that switching tube Q1 drain electrode is gray shade scale controller 2, its source class ground connection, its control end connects the output terminal of pulse-width modulator 25, and the input end of pulse-width modulator 25 is connected with signal processor 3.
As one embodiment of the invention, switching tube Q1 can be N-type metal-oxide-semiconductor.
Signal processor 3 comprises: data shift register 31, for single line input signal Din is converted to gray shade scale control signal, current regulating signal and output control signal; Address register 32, for demodulation output control signal, and output driver 33, for strengthening the load capacity of exporting control signal after demodulation, output single line data output Dout is as the driving signal of next stage circuit.
As one embodiment of the present invention, described LED-backlit display driver circuit can drive by multi-stage serial connection.
In embodiments of the present invention, in LED-backlit display device, the quantity of combination of pixels can be according to application settings.
Single line data input signal Din exports a gray shade scale conditioning signal to pulse-width modulator 25 by data shift register 31, these pulse width regulator 25 outputs have the make-and-break time of the pulse signal gauge tap pipe Q1 of certain dutycycle, to realize the control to its average current.Current regulation unit 24 is received the current regulating signal from data shift register 31 simultaneously, in the time of switching tube Q1 conducting, regulate the brightness of blue main channel current source 21, and control red secondary channels current source 22 and green secondary channels current source 23 carries out wavelength rectification to fine chrominance primary, to export Hi-Fi blue primary light source, in like manner realize the rectification output of red light source and green light source.
After this wavelength circuit for rectifying completes the wavelength rectification of three kinds of primary colours current channels, this combination of pixels, by the mixing of high-fidelity three primary light source, really realizes high-fidelity LED-backlit and shows.
The rectification that the LED-backlit display driver circuit that the embodiment of the present invention provides can be applied to any series drives in chip.
The embodiment of the present invention is carried out brightness regulation by main channel current source to fine chrominance primary, by other two primary colours secondary channels current sources, fine chrominance primary is carried out to wavelength rectification, realize brightness and the consistent wavelength of LED, and utilize current regulation unit to regulate the current value of main channel current source and secondary channels current source, greatly improved rectification precision, to realize the high fidelity (Hi-Fi) of color, the technical program easily realizes, cost is low, is beneficial in this field and applies.
These are only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a LED wavelength circuit for rectifying, is characterized in that, described circuit comprises:
Main channel current source, for regulating the brightness of fine chrominance primary;
Two secondary channels current sources, for carrying out wavelength rectification to fine chrominance primary; And
Current regulation unit, for according to the current regulating signal of input, regulates the current value of described main channel current source and described secondary channels current source.
2. circuit as claimed in claim 1, is characterized in that, described current regulation unit is electric current register.
3. circuit as claimed in claim 1, is characterized in that, described circuit also comprises:
Gray shade scale driver, for controlling the average current value of described main channel current source and described secondary channels current source, regulates to realize gray scale.
4. circuit as claimed in claim 3, is characterized in that, described gray shade scale driver comprises:
Switching tube, utilizes the average current value of main channel current source and described secondary channels current source described in break-make control; And
Pulse-width modulator, for the pulse signal of certain dutycycle is provided, controls the break-make of described switching tube.
5. circuit as claimed in claim 4, is characterized in that, described switching tube is N-type metal-oxide-semiconductor.
6. a LED-backlit display driver circuit, comprises LED light emitting diode and signal processor, it is characterized in that, described LED-backlit display driver circuit also comprises LED wavelength circuit for rectifying, and described LED wavelength circuit for rectifying comprises:
Main channel current source, for regulating the brightness of fine chrominance primary;
Two secondary channels current sources, for carrying out wavelength rectification to fine chrominance primary; And
Current regulation unit, for according to the current regulating signal of input, regulates the current value of described main channel current source and described secondary channels current source.
7. correct and drive a chip, it is characterized in that, described chip comprises LED-backlit display driver circuit as claimed in claim 6.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201010619714.2A CN102542996B (en) | 2010-12-31 | 2010-12-31 | Light-emitting diode (LED) wavelength correcting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010619714.2A CN102542996B (en) | 2010-12-31 | 2010-12-31 | Light-emitting diode (LED) wavelength correcting circuit |
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| CN102542996A CN102542996A (en) | 2012-07-04 |
| CN102542996B true CN102542996B (en) | 2014-09-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102019208347A1 (en) * | 2019-06-07 | 2020-12-10 | Volkswagen Aktiengesellschaft | Method for operating a light-emitting diode module and light-emitting diode module |
| CN114648944A (en) * | 2020-12-21 | 2022-06-21 | 西安钛铂锶电子科技有限公司 | Display driving method and circuit, LED display panel and display device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6633301B1 (en) * | 1999-05-17 | 2003-10-14 | Displaytech, Inc. | RGB illuminator with calibration via single detector servo |
| CN101416100A (en) * | 2006-03-02 | 2009-04-22 | Lg伊诺特有限公司 | Light emitting device and method for driving the same |
| CN201479427U (en) * | 2009-08-21 | 2010-05-19 | 深圳市长运通集成电路设计有限公司 | Lighting rectification device of light-emitting diode module |
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2010
- 2010-12-31 CN CN201010619714.2A patent/CN102542996B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6633301B1 (en) * | 1999-05-17 | 2003-10-14 | Displaytech, Inc. | RGB illuminator with calibration via single detector servo |
| CN101416100A (en) * | 2006-03-02 | 2009-04-22 | Lg伊诺特有限公司 | Light emitting device and method for driving the same |
| CN201479427U (en) * | 2009-08-21 | 2010-05-19 | 深圳市长运通集成电路设计有限公司 | Lighting rectification device of light-emitting diode module |
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| CN102542996A (en) | 2012-07-04 |
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Address after: 518000 Guangdong City, Nanshan District province high tech in the middle of the two road, No. 2 Shenzhen International Software Park, room 201-205, room, 4 (only office) (222-226) Patentee after: Shenzhen mayor express Semiconductor Technology Co., Ltd. Address before: 518000, No. 2, building 4, two software park, central science and technology zone, Nanshan District hi tech Zone, Guangdong, Shenzhen Patentee before: Shenzhen CYT Optoelectronic Technology Co.,Ltd. |