CN1326404C - Automatic colour temp regulating method and device - Google Patents
Automatic colour temp regulating method and device Download PDFInfo
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- CN1326404C CN1326404C CNB2004100218864A CN200410021886A CN1326404C CN 1326404 C CN1326404 C CN 1326404C CN B2004100218864 A CNB2004100218864 A CN B2004100218864A CN 200410021886 A CN200410021886 A CN 200410021886A CN 1326404 C CN1326404 C CN 1326404C
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Abstract
The present invention discloses a method and a device for automatically adjusting color temperature, which relates to an electronic technology, particularly to a digital processing technology of analog video signals. The present invention can adjust the input of input signals according to values of output signals after A/D conversion, which are fed back to the input signals before the A/D conversion. The present invention has the advantages that the purpose of each liquid crystal display obtaining the same brightness-color temperature characteristic under the precondition of consistent parameters of liquid crystal screens can be realized; OFFSET and GAIN of an A/D converter is not required to be debugged during manufacturing processes; the present invention can obviously improve the quality of displayed pictures, can ensure the consistency of the color temperature of batch productions, and can improve productivity effects at the same time.
Description
Technical field
The present invention relates to electronic technology, particularly the digital processing technology of analog video signal.
Background technology
Display, particularly LCD circuit generally are made up of CPU, A/D converter and display format converter.Under the control of CPU and management, it at first carries out the A/D conversion with simulation R, G, the B signal of the output of PC display adapter, and then after carrying out digital plane display format conversion process, signal is delivered on the LCD screen show.
Because the A/D transducer performance has discreteness, and simulation R, the G of different PC display adapters output, the inconsistency of B signal amplitude, in the time of can causing changing different LCD or PC signal source, the brightness of LCD---color temperature characteristic changes, and need carry out automatic colour temperature adjustment to guarantee display effect.
And some LCD chip suppliers in the related specifications and technological document of its PW13X series LCD application-specific integrated circuit (ASIC), do not adjust the description of function such as U.S. PIXELWORKS company about automatic colour temperature.
Practical test result shows:
1, to same shows signal, different PC display adapters have inconsistent output amplitude;
2, different A/D converters may have different data image signal zero point and full scale.
Therefore, adjust the LCD of function to not having automatic colour temperature, when connecting different host computer (display adapter): 1) because the analogue signal amplitude of display adapter output is inconsistent, the digital image signal of A/D converter output also will change thereupon, cause that the brightness of LCD---color temperature characteristic changes; 2), need in process of production the skew (OFFSET) and the gain (GAIN) of each piece A/D converter are debugged owing to the discreteness of A/D transducer performance.
Summary of the invention
Technical problem to be solved by this invention is not adjust the general implementation method that the display, particularly LCD of function provide a kind of automatic colour temperature to adjust for there being automatic colour temperature.
The present invention solve the technical problem the technical scheme that is adopted, and a kind of automatic color temperature adjusting method is provided, and according to the output signal numerical value after the A/D conversion, feeds back to the preceding input signal of A/D conversion, regulates its input.
Described signal comprises the signal of R, G, three passages of B.The present invention regulates the OFFSET and the GAIN of input signal according to R, the G of A/D conversion output, the maximum and the minimum value of B signal, and making each road signal maximum is maximum standard, and minimum value is a minimum sandards.Comprise step:
1) gain with A/D converter R, G, B passage is set to fixed value;
2) regulate the skew of R, G, B passage, all just equal its standard up to the value of one group of register of R, G, B;
3) regulate the gain of R, G, B passage, all just equal its standard up to value of another group register of R, G, B;
4) R, G, the yield value of B passage, the deviant after will regulating writes EEPROM.
R, G, B-register are divided into two groups, are respectively 3 maximum value register of 3 minimum value register of R, G, B and R, G, B;
The standard of the value of minimum value register is that simulation R, G, B are transformed to the minimum sandards of the black level value of digital R, G, B through A/D;
The standard of the value of maximum value register is that simulation R, G, B are transformed to the maximum standard of the white level value of digital R, G, B through A/D.
The maximum standard of described digital R, G, B is FFH, and the minimum sandards of digital R, G, B is 00H.
Step 2) concrete steps are:
A) skew with A/D converter R, G, B passage is set to minimum value;
B) progressively increase R, G, B channel offset value respectively, monitor 3 minimum value register values simultaneously, just equaling 00H to some register values then no longer increases corresponding skew; Continuing increases other deviant, all just equals 00H up to 3 register values.
The concrete steps of step 3) are:
C) gain with A/D converter R, G, B passage is set to maximum FFH;
D) progressively reduce R, G, B channel gain value respectively, monitor 3 maximum value register values simultaneously, just equal FF to some register values and then no longer reduce corresponding gain; Continue to reduce other yield value, all just equal FFH up to 3 register values.
The present invention adopts stepping or reducing-pitch thread to increase or reduce skew and gain.Described fixed value is a median.
The present invention adopts stepping or reducing-pitch thread to increase or reduce skew and gain.
The present invention also provides a kind of automatic color temperature regulator, comprises a CPU, amplifier, A/D converter and 6 registers, and analog signal is through amplifier input A/D converter, and the output of A/D converter feeds back to amplifier through CPU; Described 6 registers write down the maximum and the minimum value of R, G, B passage respectively, described CPU is according to the numerical value in described 6 registers, regulating the gain and the side-play amount of A/D input signal, is maximum standard until each channel signal maximum, and minimum value is a minimum sandards.Described maximum standard is FFH, and described minimum sandards is 00H.
Described 6 registers write down the maximum value register and the minimum value register of R, G, B passage respectively;
Described amplifier is used to regulate the skew and the gain of R, G, B passage;
Described CPU is according to the numerical value in described 6 registers, resonance-amplifier.
Described amplifier is a variable gain amplifier.
The invention has the beneficial effects as follows, realized under the prerequisite of liquid crystal screen parameter unanimity, make each LCD obtain identical brightness---color temperature characteristic, do not need in process of production the OFFSET and the GAIN of A/D converter are debugged.Do not adopt LCD of the present invention, the inconsistency of PC display adapter amplitude output signal and the discreteness of A/D transducer performance, can be reflected in together on the image signal data of A/D converter output, and finally be reflected in 6 mentioned registers of aforementioned techniques scheme, it is self-adjusting that the present invention then is that the data value according to 6 registers carries out, thereby these two problems have obtained solution in the lump.The present invention can significantly improve the display frame quality, guarantees that the bulk article colour temperature is conforming, enhance productivity simultaneously.
Description of drawings
Fig. 1 is the inventive method flow chart.
Fig. 2 is apparatus of the present invention schematic diagrames.
Embodiment
LCD is when the normal analog signal that receives and handle from PC, and the A/D converter is 3 * 8 (R, G, B) data image signals of output in real time.At format conversion IC interior G PORT 38 maximum value register and 38 minimum value register are arranged, write down the maximum and the minimum value of R, G in the former frame image, B data respectively, i.e. white level value and black level value in the image.Under the perfect condition, these two values should just in time be FFH and 00H, show according to actual test result in practical application, these two values depart from FFH and 00H, and system does not grasp simulation R, the G from the PC display adapter, the inconsistent degree of B and the dispersion degree of A/D converter yet, so adopt other external compensation method to lack foundation, be difficult to implement.Because black signal can obtain by line retrace, therefore when we know in the frame image adularescent signal, system is as long as recall to ideal value with these two values that depart from, just realized naturally to whole signal import, the calibration of output characteristic.Specifically, system controlling software is according to the data of these 6 registers, OFFSET and GAIN to A/D converter front end adjust and set, to change A/D converter front end signal OFFSET and GAIN, make the start point signal and the amplitude that are added to A/D converter inlet change, the output of A/D converter also changes like this, and the data of register change thereupon; And then, continue to adjust the OFFSET and the GAIN of A/D converter front end according to the variation of these register datas, just be 00H or a value that is close to 00H up to minimum value register; Maximum value register just is that 16 systems are counted FFH or near FFH, thereby realizes the purpose that automatic colour temperature is adjusted.The method of adjusting can adopt stepping (step-length is fixed) or reducing-pitch thread (step-length is descending) dual mode.
As the specific embodiment of the invention, be example with the serial LCD circuit platform of the PW13X of U.S. PIXELWORKS, specifically describe enforcement of the present invention, referring to Fig. 1 and Fig. 2.
When the LCD operate as normal that PW13X series integrated circuit platform constitutes, its built-in A/D converter at first will be transformed into 3 * 8 real time digital signals from analog signal R, G, the B of PC, after the A/D conversion of finishing a frame image data, maximum and the minimum value of R, G, B write in following 6 G PORT registers:
G PORT register base address Base Address=Byte 40h
Red minimum value register offset address REDMIN (7:0) Byte offset 0E
Red maximum value register offset address REDMAX (7:0) Byte offset 0F
Green minimum value register offset address GRNMIN (7:0) Byte offset 10
Green maximum value register offset address GRNMAX (7:0) Byte offset 11
Blue minimum value register offset address BLUMIN (7:0) Byte offset 12
Blue maximum value register offset address BLUMAX (7:0) Byte offset 13
Black or the flyback part in the value correspondence image of 3 minimum value register wherein, white in the corresponding image of 3 maximum value register is the highest part of brightness, the A/D converter that has inconsistent output amplitude, different PW13X series integrated circuit owing to different PC display adapters has different data image signal zero points and these two reasons of full scale, cause minimum value register not necessarily just not necessarily just to be FFH for 00H, maximum value register, adjust by the inventive method this moment, and these adjustment all realize by system controlling software:
1) GAIN with A/D converter R, G, B passage is set to median 80H;
2) OFFSET with A/D converter R, G, B passage is set to minimum value 00H;
3) progressively increase R, G, B passage OFFSET value respectively, monitor 3 minimum value register simultaneously, just equaling 0 to some register values no longer increases corresponding OFFSET; Continuing increases other OFFSET value, all just equals 00H up to 3 register values;
4) GAIN of A/D converter R, G, B passage is set to maximum FFH;
5) progressively reduce R, G, B passage GAIN value respectively, monitor 3 maximum value register simultaneously, just equal FFH to some register values and then no longer reduce corresponding GAIN; Continue to reduce other GAIN value, all just equal FFH up to 3 register values;
6) the colour temperature adjustment is finished automatically, 6 is adjusted use when data value writes EEPROM for next start.
Above-mentioned steps 5) in, if the output of A/D converter surpasses peak, then amplitude limit is to FFH, this moment, the value of maximum value register also was FFH, so specifically when adjusting GAIN, reduced GAIN before this and make the value of maximum value register begin to change (reducing), and finely tuned then when GAIN makes A/D output just in time for FFH and end from FFH.
The algorithm of above-mentioned increase or minimizing can adopt stepping, and promptly step-length is 1 increasing or decreasing; Also can take reducing-pitch thread, promptly step-length is descending.
The embodiment that takes reducing-pitch thread to adjust is as follows: (PW13X with U.S. PIXELWORKS is an example)
1. the GAIN with A/D converter R, G, B passage is set to median 80H;
2. the OFFSET with A/D converter R, G, B passage is set to minimum value 00H;
3. respectively R, G, B passage OFFSET value are made as 40H, monitor 3 minimum value register simultaneously, if register value, again R, G, B passage OFFSET value are increased aforementioned set point increment absolute value greater than 00H half promptly be made as 60H; If register value equals 00H, half that then again R, G, B passage OFFSET value is reduced aforementioned set point increment absolute value is 20H, monitor 3 minimum value register simultaneously, repeat above step (step-length of set point increase and decrease is followed successively by 20H, 10H, 8H, 4H, 2H, 1H), just equal 00H up to register value;
4.A/D the GAIN of converter R, G, B passage is set to maximum FFH;
5. respectively R, G, B passage GAIN value are made as 80H, monitor 3 maximum value register simultaneously, if register value, again R, G, B passage GAIN value are increased aforementioned set point increment absolute value less than FFH half promptly be made as 60H; If register value equals FFH, half that then again R, G, B passage GAIN value is reduced aforementioned set point increment absolute value is 40H, monitor 3 maximum value register simultaneously, repeat above step (step-length of set point increase and decrease is followed successively by 40H, 20H, 10H, 8H, 4H, 2H, 1H), just equal FFH up to register value; Automatically the colour temperature adjustment is finished;
Use when 6) 6 adjustment data values being write EEPROM for next start.
The execution mode of apparatus of the present invention is referring to Fig. 2.Present embodiment comprises a CPU, amplifier, A/D converter and 6 registers, and analog signal is through amplifier input A/D converter, and the output of A/D converter feeds back to amplifier; Described 6 registers write down the maximum and the minimum value of R, G, B passage respectively, described CPU is according to the numerical value in described 6 registers, regulating the gain and/or the side-play amount of A/D converter input signal, is maximum standard until each channel signal maximum, and minimum value is a minimum sandards.The described maximum standard of present embodiment is FFH, and promptly the highest white of brightness represents that described minimum sandards is 00H, i.e. the black that brightness is minimum.Described amplifier is a variable gain amplifier.
" maximum standard " of the present invention is at final display effect with " minimum sandards ", and for 8 bit memories, desirable maximum standard is FF, and minimum sandards is 00.For leveling off to the numerical value of FFH or 00H, though its numerical value is not 00H and FFH, it is still based on thinking of the present invention, and display effect is identical with the present invention, also belongs to the scope of the invention.In like manner, for based on thinking of the present invention but adopt the memory of other figure places, for example, and 16 bit memories, maximum standard is FFFFH, minimum sandards is 0000H, also is in interest field of the present invention.
Claims (9)
1, automatic color temperature adjusting method is characterized in that, may further comprise the steps:
1) gain with A/D converter R, G, B passage is set to fixed value;
2) regulate the skew of R, G, B passage, all just equal its standard up to the value of one group of register of R, G, B;
3) regulate the gain of R, G, B passage, all just equal its standard up to value of another group register of R, G, B;
4) R, G, the yield value of B passage, the deviant after will regulating writes EEPROM.
R, G, B-register are divided into two groups, are respectively 3 maximum value register of 3 minimum value register of R, G, B and R, G, B;
The standard of the value of minimum value register is that simulation R, G, B are transformed to the minimum sandards of the black level value of digital R, G, B through A/D;
The standard of the value of maximum value register is that simulation R, G, B are transformed to the maximum standard of the white level value of digital R, G, B through A/D.
2, automatic color temperature adjusting method as claimed in claim 1 is characterized in that, the maximum standard of described digital R, G, B is FFH, and the minimum sandards of digital R, G, B is 00H.
3, automatic color temperature adjusting method as claimed in claim 2 is characterized in that step
2) concrete steps are:
A) skew with A/D converter R, G, B passage is set to minimum value;
B) progressively increase R, G, B channel offset value respectively, monitor 3 minimum value register values simultaneously, just equaling 00H to some register values then no longer increases corresponding skew; Continuing increases other deviant, all just equals 00H up to 3 register values.
4, automatic color temperature adjusting method as claimed in claim 3 is characterized in that, adopts stepping or reducing-pitch thread to increase skew.
5, automatic color temperature adjusting method as claimed in claim 2 is characterized in that step
3) concrete steps are:
C) gain with A/D converter R, G, B passage is set to maximum FFH;
D) progressively reduce R, G, B channel gain value respectively, monitor 3 maximum value register values simultaneously, just equal FF to some register values and then no longer reduce corresponding gain; Continue to reduce other yield value, all just equal FFH up to 3 register values.
6, automatic color temperature adjusting method as claimed in claim 5, tool are characterised in that, adopt stepping or reducing-pitch thread to reduce gain.
7, as any described automatic color temperature adjusting method of claim 1 to 6, it is characterized in that described fixed value is a median.
8, automatic color temperature regulator is characterized in that, comprises a CPU, amplifier, A/D converter and 6 registers, and analog signal is through amplifier input A/D converter, and the output of A/D converter feeds back to amplifier through CPU;
Described 6 registers write down the maximum value register and the minimum value register of R, G, B passage respectively;
Described amplifier is used to regulate the skew and the gain of R, G, B passage;
Described CPU is according to the numerical value in described 6 registers, resonance-amplifier.
9, automatic color temperature regulator as claimed in claim 8 is characterized in that, described amplifier is a variable gain amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100218864A CN1326404C (en) | 2004-02-23 | 2004-02-23 | Automatic colour temp regulating method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100218864A CN1326404C (en) | 2004-02-23 | 2004-02-23 | Automatic colour temp regulating method and device |
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| CN1561115A CN1561115A (en) | 2005-01-05 |
| CN1326404C true CN1326404C (en) | 2007-07-11 |
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| CNB2004100218864A Expired - Fee Related CN1326404C (en) | 2004-02-23 | 2004-02-23 | Automatic colour temp regulating method and device |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101887673B (en) * | 2010-07-21 | 2011-11-30 | 福建捷联电子有限公司 | Method for dynamically predicting color temperatures of liquid crystal display television |
| CN104185003B (en) * | 2014-08-21 | 2017-03-29 | 深圳市奥拓电子股份有限公司 | A kind of color temperature adjusting method and device of video image |
| US9913327B2 (en) * | 2015-07-01 | 2018-03-06 | Cree, Inc. | Control circuit for modulating an analog dimming command signal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6034629A (en) * | 1996-09-16 | 2000-03-07 | Samsung Electronics Co., Ltd. | Analog-to-digital conversion apparatus |
| EP1289315A2 (en) * | 2001-07-27 | 2003-03-05 | Hitachi, Ltd. | Video display device and color temperature correction method for the same |
| EP1381221A2 (en) * | 2002-07-04 | 2004-01-14 | Canon Kabushiki Kaisha | Image sensing apparatus and method, program, and storage medium |
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2004
- 2004-02-23 CN CNB2004100218864A patent/CN1326404C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6034629A (en) * | 1996-09-16 | 2000-03-07 | Samsung Electronics Co., Ltd. | Analog-to-digital conversion apparatus |
| EP1289315A2 (en) * | 2001-07-27 | 2003-03-05 | Hitachi, Ltd. | Video display device and color temperature correction method for the same |
| EP1381221A2 (en) * | 2002-07-04 | 2004-01-14 | Canon Kabushiki Kaisha | Image sensing apparatus and method, program, and storage medium |
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| CN1561115A (en) | 2005-01-05 |
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