CN102542996A - Light-emitting diode (LED) wavelength correcting circuit - Google Patents
Light-emitting diode (LED) wavelength correcting circuit Download PDFInfo
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- CN102542996A CN102542996A CN2010106197142A CN201010619714A CN102542996A CN 102542996 A CN102542996 A CN 102542996A CN 2010106197142 A CN2010106197142 A CN 2010106197142A CN 201010619714 A CN201010619714 A CN 201010619714A CN 102542996 A CN102542996 A CN 102542996A
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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 the field, relate in particular to a kind of LED wavelength circuit for rectifying.
Background technology
At present, LED-backlit shows with its brightness high, and good uniformity and color representation power are strong etc., and advantage will progressively replace the LCD product, become the main flow of demonstration backlight.So-called LED-backlit shows it is to arrange the LED light emitting diode that forms through the current drives with certain wavelength is a plurality of with matrix form, form the combination of pixels with three primary colours, thereby the light that outlook is clipped to different colours is made us in generation.And existing LED-backlit shows the brightness regulation that only adopts main channel current source realization fine chrominance primary usually; The light of different wave length can produce decay or drift because of environment and factor such as aging; Make LED brightness and wavelength difference occur; Cause the deviation of display color, can't satisfy the requirement of people the color high fidelity (Hi-Fi).
Summary of the invention
The purpose of the embodiment of the 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 invention is achieved in that a kind of LED wavelength circuit for rectifying, and said circuit comprises:
The main channel current source is used to regulate the brightness of fine chrominance primary;
Two secondary channels current sources are used for that fine chrominance primary is carried out wavelength and correct; And
Current regulation unit is used for the current regulating signal according to input, regulates the current value of said main channel current source and said secondary channels current source.
Another purpose of the embodiment of the invention is to provide a kind of LED-backlit display driver circuit, comprises LED light emitting diode and signal processor, and said LED-backlit display driver circuit also comprises LED wavelength circuit for rectifying, and said LED wavelength circuit for rectifying comprises:
The main channel current source is used to regulate the brightness of fine chrominance primary;
Two secondary channels current sources are used for that fine chrominance primary is carried out wavelength and correct; And
Current regulation unit is used for the current regulating signal according to input, regulates the current value of said main channel current source and said secondary channels current source.
The embodiment of the invention is carried out brightness regulation through the main channel current source to fine chrominance primary, through other two primary colours secondary channels current sources fine chrominance primary is carried out wavelength and corrects, and realizes brightness and the consistent wavelength of LED; And utilize current regulation unit that the current value of main channel current source and secondary channels current source is regulated; Improved the rectification precision greatly, to realize the high fidelity (Hi-Fi) of color, the present technique scheme realizes easily; Cost is low, is beneficial in this field to apply.
Description of 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 the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention is carried out brightness regulation through the main channel current source to fine chrominance primary; Through other two primary colours secondary channels current sources fine chrominance primary being carried out wavelength corrects; Realize brightness and the consistent wavelength of LED; And utilize current regulation unit that the current value of main channel current source and secondary channels current source is regulated, realize improving the rectification 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 invention provides comprises:
Main channel current source 11 is used to regulate the brightness of fine chrominance primary;
Two secondary channels current sources 12 are used for that fine chrominance primary is carried out wavelength and correct; And
Fig. 2 shows the structural principle of the LED-backlit display driver circuit that second embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with the embodiment of the invention.
The LED-backlit display driver circuit comprises: signal processor 3 and a plurality of LED wavelength circuit for rectifying 1.
In embodiments of the present invention; The LED-backlit display device comprises a plurality of combination of pixels; Each combination of pixels comprises blue primary current channel (being B), red primary current channel (being R) and green primary current channel (being G) again; The current channel of every kind of primary colours can be realized through LED wavelength circuit for rectifying, be that example describes with the blue primary current channel below.
LED wavelength circuit for rectifying 1 comprises: blue main channel current source 21, its anodal LED light emitting diode 14 that passes through of fine chrominance primary being carried out brightness regulation connect the 15V supply voltages, and negative pole connects the output terminal of gray shade scale driver 2;
Fine chrominance primary is carried out red secondary channels current source 22 and the green secondary channels current source 23 that wavelength is corrected, and it is anodal through LED light emitting diode 14 connection 15V supply voltages, and negative pole connects the output terminal of gray shade scale driver 2; 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 are 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 the electric current register.
In embodiments of the present invention, current regulation unit 24 is used to store the current value in each fine chrominance primary channel current source, and to realize the setting of LED brightness, other and brightness that set can be through changing the current value adjustment in the current adjustment unit.
Current regulation unit 24 also is used to store the current value of secondary channels current source, and with the rectification of realization to the fine chrominance primary wavelength, and the secondary channels current source can be closed when fine chrominance primary need not be corrected.
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 used to control 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, be used to provide the pulse signal of certain dutycycle, and control the break-make of said switching tube; And switching tube Q1, utilize break-make to control the average current value of said main channel current source and said secondary channels current source.Wherein, switching tube Q1 drain electrode is the output terminal of gray shade scale controller 2, its source class ground connection, and 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 is used for converting single line input signal Din into gray shade scale control signal, current regulating signal and output control signal; Address register 32 is used for demodulation output control signal, and output driver 33, is used to strengthen the load capacity of output control signal after the demodulation, and output single line data output Dout is as the drive signal of next stage circuit.
As one embodiment of the present invention, said LED-backlit display driver circuit can drive by multi-stage serial connection.
In embodiments of the present invention, the quantity of combination of pixels can be according to application settings in the LED-backlit display device.
Single line data input signal Din gives pulse-width modulator 25 through gray shade scale conditioning signal of data shift register 31 outputs; These pulse width regulator 25 outputs have the make-and-break time of the pulse signal CS 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; When switching tube Q1 conducting, regulate the brightness of blue main channel current source 21; And control red secondary channels current source 22 and 23 pairs of fine chrominance primaries of green secondary channels current source and carry out wavelength and correct; 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 was accomplished the wavelength rectification to three kinds of primary colours current channels, this combination of pixels realized really that through the mixing of high-fidelity three primary light source the high-fidelity LED-backlit shows.
The LED-backlit display driver circuit that the embodiment of the invention provides can be applied in the rectification chip for driving of any series.
The embodiment of the invention is carried out brightness regulation through the main channel current source to fine chrominance primary, through other two primary colours secondary channels current sources fine chrominance primary is carried out wavelength and corrects, and realizes brightness and the consistent wavelength of LED; And utilize current regulation unit that the current value of main channel current source and secondary channels current source is regulated; Improved the rectification precision greatly, to realize the high fidelity (Hi-Fi) of color, the present technique scheme realizes easily; Cost is low, is beneficial in this field to apply.
More than be merely preferred embodiment of the present invention,, all any modifications of within spirit of the present invention and principle, being done, be equal to and replace and improvement etc., all should be included within protection scope of the present invention not in order to restriction the present invention.
Claims (7)
1. LED wavelength circuit for rectifying is characterized in that said circuit comprises:
The main channel current source is used to regulate the brightness of fine chrominance primary;
Two secondary channels current sources are used for that fine chrominance primary is carried out wavelength and correct; And
Current regulation unit is used for the current regulating signal according to input, regulates the current value of said main channel current source and said secondary channels current source.
2. circuit as claimed in claim 1 is characterized in that, said current regulation unit is the electric current register.
3. circuit as claimed in claim 1 is characterized in that, said circuit also comprises:
The gray shade scale driver is used to control the average current value of said main channel current source and said secondary channels current source, regulates to realize gray scale.
4. circuit as claimed in claim 3 is characterized in that, said gray shade scale driver comprises:
Pulse-width modulator is used to provide the pulse signal of certain dutycycle, controls the break-make of said switching tube; And
Switching tube utilizes break-make to control the average current value of said main channel current source and said secondary channels current source.
5. circuit as claimed in claim 4 is characterized in that, said switching tube is a 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, said LED-backlit display driver circuit also comprises LED wavelength circuit for rectifying, and said LED wavelength circuit for rectifying comprises:
The main channel current source is used to regulate the brightness of fine chrominance primary;
Two secondary channels current sources are used for that fine chrominance primary is carried out wavelength and correct; And
Current regulation unit is used for the current regulating signal according to input, regulates the current value of said main channel current source and said secondary channels current source.
7. correct chip for driving for one kind, it is characterized in that said 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 |
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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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| CN102542996A true CN102542996A (en) | 2012-07-04 |
| CN102542996B CN102542996B (en) | 2014-09-03 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114097306A (en) * | 2019-06-07 | 2022-02-25 | 大众汽车股份公司 | 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 |
-
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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114097306A (en) * | 2019-06-07 | 2022-02-25 | 大众汽车股份公司 | 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 |
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| CN102542996B (en) | 2014-09-03 |
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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. |