CN1900772A - Method and device for regulating liquid crystal panel flash - Google Patents
Method and device for regulating liquid crystal panel flash Download PDFInfo
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- CN1900772A CN1900772A CN 200510084519 CN200510084519A CN1900772A CN 1900772 A CN1900772 A CN 1900772A CN 200510084519 CN200510084519 CN 200510084519 CN 200510084519 A CN200510084519 A CN 200510084519A CN 1900772 A CN1900772 A CN 1900772A
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- striped
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Abstract
The adjusting device includes following parts: display faceplate, adjusting unit in use for adjusting flicker degree of display faceplate, image generation unit, photoelectric conversion unit, and control circuit. The image generation unit makes the display faceplate displays prearranged image. The said prearranged image possesses interleaved arranged first stripes and second stripes in multiple different gray scales. Photoelectric conversion unit senses the said prearranged image on the display plane, and generates electric signals. The control circuit converts the electric signals to flicker signals. Based on minimal value of the flicker signals, the adjusting unit adjusts flicker degree of display faceplate.
Description
Technical field
The present invention relates to a kind of adjusting gear and method of display panel, particularly relate to a kind of method of adjustment of display panels flicker level.
Background technology
General LCD screen (liquid crystral display) is to provide reference level with driving voltage Vcom when display frame, makes the working bias voltage that acts on each display pixel be able to reverse the bright degree that liquid crystal is controlled light with reference to this driving voltage; Because the deviation of individual difference, back light brightness and uniformity coefficient between pixel, or the factors such as frequency of scan drive circuit cause LCD screen to produce the phenomenon of flicker (flick).
Generally improving the mode of the flicker level of LCD screen, is when the LCD screen video picture, with charge-coupled image sensor (Charge Coupled Device; Be called for short CCD) etc. sensing component obtain the image of LCD screen, by analysis, calculate correct flicker value, and then adjust driving voltage Vcom according to flicker value to this image, improve the flicker level of LCD screen whereby.Yet this kind mode need use expensive sensing component to come capture, and still needs just can draw correct flicker value through the calculating correction of complexity, its cost height.Moreover, except the consideration of cost, for the small-medium size liquid crystal panel, little because of the area of liquid crystal panel, flicker level is serious not as large-scale liquid crystal panel, therefore requires also lower, so application vendor of general small-medium size liquid crystal panel, for example producers such as mobile portable product, personal digital assistant, device for mobile communication all are the flicker level of judging and adjust liquid crystal panel with human eye generally, therefore are badly in need of the method for adjustment and the device of a kind of economy and robotization.
Summary of the invention
Fundamental purpose of the present invention is to be to provide a kind of low cost, liquid crystal panel flash adjusting gear fast.
A kind of liquid crystal panel flash adjusting gear of the present invention comprises display panel, adjustment unit, image generation unit, photoelectric conversion unit, and control circuit.
This display panel has display plane, and this display plane has defined horizontal direction and vertical direction, and this display panel is with scanning in the horizontal direction and in the display frame on this display plane of vertical direction mode from top to bottom.This adjustment unit is adjusted the flicker level of this display panel by changing driving voltage.
This image generation unit is used so that this display panel shows the predetermined image with a plurality of first stripeds and second striped, and described first striped and described second striped self are staggered, and described first striped has different GTG degree with second striped.Preferably, the GTG degree of described first striped is more than or equal to 0%, and is less than or equal to 40%, and the GTG degree of described second striped is more than or equal to 60%, and is less than or equal to 100%.Preferably, the GTG degree difference of described first striped and described second striped is more than or equal to 50%.More preferably, the GTG degree of described first striped is 0%, and the GTG degree of described second striped is 70%.
This photoelectric conversion unit is to respond to the predetermined image on this display plane and produce an electric signal with optical mode.This control circuit then produces a flash signal according to the electric signal of this photoelectric conversion unit generation, and this adjustment unit is adjusted the flicker level of this display panel according to the minimum value of this flash signal.
Another purpose of the present invention is to provide a kind of optimized low cost of liquid crystal panel flash degree and method of adjustment fast of making.So liquid crystal panel flash method of adjustment of the present invention comprises the following step:
Display panel with display plane is provided, and this display plane has defined horizontal direction and vertical direction, and this display panel is with scanning in the horizontal direction and in the display frame on this display plane of vertical direction mode from top to bottom.
Show the predetermined image with a plurality of first stripeds and second striped at this display panel, described first striped and described second striped self are staggered, and described first striped has different GTG degree with described second striped.With the predetermined image on this display plane of optical mode sensing, obtain the flash signal of an interchange.Adjust the flicker level of this display panel according to this flash signal.
Description of drawings
The present invention is described in detail below in conjunction with drawings and Examples:
Fig. 1 is the function block schematic diagram of the possible embodiments of a liquid crystal panel flash adjusting gear of the present invention, illustrates that the present invention comprises a LCD and a scintillation detector;
Fig. 2 is a predetermined image on the display plane of this possible embodiments, illustrates that this predetermined image is made of two kinds of first striped and second stripeds that have different GTG degree respectively;
Fig. 3 is a view that is similar to Fig. 1, illustrates that this scintillation detector has an image generation unit.
Detailed Description Of The Invention
Yi Xia embodiment for convenience of description, similarly assembly is represented with identical label.
Consult Fig. 1 and Fig. 2, the possible embodiments of liquid crystal panel flash adjusting gear of the present invention comprises LCD 1 and scintillation detector 2.This LCD 1 comprises display panel 11, driver element 12, image generation unit 13, adjustment unit 14.
This display panel 11 has display plane 3, and this display plane definition has horizontal direction X and vertical direction Y.This driver element 12 drives this display panel 11 by driving voltage Vcom, makes this display panel 11 with X scanning in the horizontal direction and in the display frame on this display plane 3 of vertical direction Y mode from top to bottom.
But the driving voltage Vcom of this this driver element 12 of adjustment unit 14 modulations, and so as to adjusting the flicker level of this display panel 11.In the present embodiment, this adjustment unit 14 has a variable resistor, and via changing variable-resistance resistance sizes, the position that just can adjust this driving voltage Vcom is accurate, and then adjusts the flicker level of this display panel 11.
This image generation unit 13 provides the signal of the predetermined image with a plurality of staggered first stripeds 31 and second striped 32 to this driver element 12, make this display panel 11 produce first striped 31 and second striped 32 that is parallel to horizontal direction X, and each first striped 31 and second striped 32 self are staggered at vertical direction Y, and first striped 31 has 0% GTG degree, second striped 32 has 70% GTG degree, and width with same pixel of first striped 31 and second striped 32.
This scintillation detector 2 comprises photoelectric conversion unit 21, control circuit 22, memory control module 23, and indicating member 24.
This photoelectric conversion unit 21 is the electronic packages that light signal can be converted to electric signal, and in the present embodiment, this photoelectric conversion unit 21 is phototransistor (photo transister), but also can be photodiode (photo diode).When this photoelectric conversion unit 21 sensed the predetermined image that has first striped 31 and second striped 32 on this display plane 3, the electric signal that it produced had direct current component and AC portion; Direct current component is subjected to the influence of predetermined image overall brightness, and then relevant for the flicker level of display panel 11, the amplitude of its AC portion is bigger for AC portion, and scintillation is more serious.
This control circuit 22 comprises interchange separative element 221, low-pass filter unit 222, rectification unit 223, and digital conversion unit 224.
This exchanges separative element 221 and connects these photoelectric conversion units 21, and in order to intercepting the direct current component in the electric signal that this photoelectric conversion unit 21 produced, and then output only has the flash signal of AC portion.In this example, this interchange separative element 221 is capacitors.
This low-pass filter unit 222 connects this and exchanges separative element 221, in order to intercept the HFS that belongs to sweep frequency in the interchange flash signal that this interchange separative element 221 exported, and output frequency belongs to the appreciable low frequency part of human eye, just less than the flash signal of 100 hertz (Hz).
This rectification unit 223 connects this low-pass filter unit 222, is converted to direct current signal and output in order to the flash signal that will only have the low-frequency ac part.This digital conversion unit 224 connects these rectification units 223, exports after being converted to digital flash signal in order to the flash signal with these rectification unit 223 outputs.
The input end of this memory control module 23 connects the output terminal of this digital conversion unit 224, when the driver element 12 of this LCD 1 drives display panel 11 with a plurality of different driving voltage Vcom, the flash signal values of different sizes can be exported in this digital conversion unit 224, minimum value in the flash signal value of these memory control module 23 record inputs, and export this minimum value.
This adjustment unit 14 is set the optimal drive voltage Vcom of this LCD 1 according to the minimum flash signal value of this memory control module 23 outputs, so that this driver element 12 when driving these display panels 11, reduces the flicker level of this display panel 11.
This indicating member 24 connects the output terminal of this digital conversion unit 224, and shows the size of this flash signal value according to the digital flash signal of these digital conversion unit 224 outputs, allows the user can learn the flicker level of this display panel 11.In the present embodiment, the strip marking device that this indicating member 24 is made up of a plurality of light emitting diode (bar display), but also can use the marking device of pointer-type or digital display type.
What deserves to be mentioned is, the memory control module 23 of this scintillation detector 2 also can omit, or optionally just be connected with this LCD 1, that is to say that the user can understand the flicker level of this LCD 1 via eye-observation indicating member 24, and then can come this scintillation detector 2 is carried out adjustment in the mode of manual adjustment driving voltage Vcom.
In the present embodiment, this LCD 1 comprises image generation unit 13, but also can be as shown in Figure 3, and this LCD 1 does not comprise this image generation unit 13, this stroboscopic display 2 then comprises this image generation unit 13, and this image generation unit 13 can be connected with this driver element 12.At this moment, this scintillation detector 2 can be used by independent sale or the manufacturer that offers LCD 1.Moreover when the flicker level of the different LCD 2 of adjusting same model, the reference value when the preceding minimum flash signal value that once is recorded in memory control module 23 can provide LCD 2 coarse adjustment next time is to save collating time.
Consult Fig. 1,2, the possible embodiments of liquid crystal panel flash method of adjustment of the present invention comprises the following step:
At first, display panel 11 is provided, and this display panel 11 has display plane 3, and these display plane 3 definition have horizontal direction X and vertical direction Y, and this display panel 11 is with scanning in the horizontal direction and in vertical direction mode from top to bottom, display frame on this display plane 3.
Then, on this display panel 11, show predetermined image with image generation unit 13 with a plurality of first stripeds 31 and a plurality of second stripeds 32, each first striped 31 and each second striped 32 self are staggered at vertical direction Y, and first striped 31 has 0% GTG degree, and second striped 32 has 70% GTG degree, and both have identical width.
It should be noted that the GTG degree of first striped 31 also can be between 0% to 40%, the GTG degree of second striped 32 then can be between 60% to 100%.Or both GTG degree differences are more than or equal to 50%.
Predetermined image with on this display plane 3 of photoelectric conversion unit 21 sensings obtains having the flash signal of direct current component and AC portion.Then, utilize and exchange the flash signal that separative element 221 intercepts direct current component, and stay the flash signal of AC portion, utilize low-pass filter unit 222 that aforementioned the flash signal with AC portion isolated frequency less than 100 hertz low-frequency ac flash signal again; See through rectification unit 223 then this low-frequency ac flash signal is converted to the direct current flash signal,, make this direct current flash signal be converted to the flash signal of digital form again through digital conversion unit 224.
When making the driving voltage Vcom change of this display panel 11 when adjusting an adjustment unit 14, the flicker level that has different GTG degree and staggered first striped 31 and second striped 32 on this display plane 3 is along with change, makes the size of flash signal value of digital form also along with change.Then utilize memory control module 23, the flash signal value is carried out record, and obtain a minimum value, make this adjustment unit 14 that driving voltage Vcom is controlled at an optimum value according to this minimum value again, and then make the flicker level of this display panel 11 reach optimization.
In sum, structural attitude of the present invention has utilized image generation unit 13 to have different GTG degree and staggered bar detection image with generation, and with simple structure, photoelectric conversion unit 21 transfers this image to electric signal cheaply, regulate and control the flicker level of display panel 11 again according to the minimum value of this electric signal (flash signal), so can avoid calculating flicker value, thereby do not need accurate expensive electronic package, just can reach good, the acceptable best flicker level of human eye.And judge the method for adjustment of flicker level than having human eye now, more can effectively save the adjustment time.
Claims (20)
1, a kind of display panels flicker adjusting gear, comprise display panel and adjustment unit, this display panel has display plane, this display plane definition has horizontal direction and vertical direction, this display panel is with scanning in the horizontal direction and in vertical direction mode from top to bottom, display frame on this display plane, and this adjustment unit is in order to adjust the flicker level of this display panel, it is characterized in that this display panels flicker adjusting gear also comprises:
Image generation unit, with so that this display panel shows the predetermined image with a plurality of first stripeds and a plurality of second stripeds, each first striped and each second striped self are staggered, and described first striped has different GTG degree with described second striped;
Photoelectric conversion unit is responded to the predetermined image on this display plane and is produced an electric signal with optical mode; And
Control circuit produces a flash signal according to the electric signal of this photoelectric conversion unit generation, and controls this adjustment unit and adjust the flicker level of this display panel according to this flash signal to best.
2. display panels flicker adjusting gear as claimed in claim 1, it is characterized in that: this control circuit comprises the interchange separative element that connects this photoelectric conversion unit, in order to intercept direct current signal in the electric signal that this photoelectric conversion unit produces and the flash signal of output AC.
3. display panels flicker adjusting gear as claimed in claim 1, it is characterized in that: this interchange separative element is a capacitor.
4. display panels flicker adjusting gear as claimed in claim 2, it is characterized in that: this control circuit also comprises the low-pass filter unit that connects this interchange separative element, in order to intercepting the HFS in the interchange flash signal that this interchange separative element produced, and output frequency is less than 100 hertz flash signal.
5. display panels flicker adjusting gear as claimed in claim 1 is characterized in that: described display panels flicker adjusting gear also comprises the memory control module, judges the minimum value of the flash signal of this control circuit output in order to record.
6. display panels flicker adjusting gear as claimed in claim 2 is characterized in that: described display panels flicker adjusting gear also comprises the indicating member that shows the size of this flash signal value according to the flash signal of this control circuit.
7. display panels flicker adjusting gear as claimed in claim 1, it is characterized in that: this photoelectric conversion unit is photodiode or phototransistor.
8. display panels flicker adjusting gear as claimed in claim 1, it is characterized in that: the GTG degree of described first striped is more than or equal to 0%, and be less than or equal to 40%, the GTG degree of described second striped is more than or equal to 60%, and is less than or equal to 100%.
9. display panels flicker adjusting gear as claimed in claim 1, it is characterized in that: the GTG degree difference of described first striped and described second striped is more than or equal to 50%.
10. display panels flicker adjusting gear as claimed in claim 8, it is characterized in that: the GTG degree of described first striped is 0%, the GTG degree of described second striped is 70%.
11. display panels flicker adjusting gear as claimed in claim 9, it is characterized in that: the GTG degree of described first striped is 0%, and the GTG degree of described second striped is 70%.
12. display panels flicker method of adjustment, comprise the step that display panel is provided, this display panel has display plane, this display plane definition has horizontal direction and vertical direction, and this display panel is with scanning in the horizontal direction and in vertical direction mode from top to bottom, display frame on this display plane is characterized in that this display panels flicker method of adjustment also comprises the following step:
Show the predetermined image with a plurality of first stripeds and a plurality of second stripeds at this display panel, each first striped and each second striped self are staggered, and described first striped has different GTG degree with described second striped;
With the predetermined image on this display plane of optical mode sensing, obtain the flash signal of an interchange; And
Adjust the flicker level of this display panel according to this flash signal.
13. display panels flicker method of adjustment as claimed in claim 12 is characterized in that: described display panels flicker method of adjustment also comprises isolates the step of frequency less than 100 hertz interchange flash signal.
14. display panels flicker method of adjustment as claimed in claim 13, it is characterized in that: described display panels flicker method of adjustment also comprises the step that this interchange flash signal is converted to the direct current flash signal, and adjusts the step of this flicker of display panel degree according to the minimum value of this direct current flash signal.
15. display panels flicker method of adjustment as claimed in claim 12, it is characterized in that: the GTG degree of described first striped is more than or equal to 0%, and be less than or equal to 40%, the GTG degree of described second striped is more than or equal to 60%, and is less than or equal to 100%.
16. display panels flicker method of adjustment as claimed in claim 12, it is characterized in that: the GTG degree difference of described first striped and described second striped is more than or equal to 50%.
17. display panels flicker method of adjustment as claimed in claim 15, it is characterized in that: the GTG degree of described first striped is 0%, and the GTG degree of described second striped is 70%.
18. display panels flicker adjusting gear, be used for a display panel, this display panel has the display plane that definition has horizontal direction and vertical direction, this display panel is with scanning in the horizontal direction and in vertical direction mode from top to bottom, display frame on this display plane, it is characterized in that this display panels flicker adjusting gear comprises:
Image generation unit, with so that this display panel shows the predetermined image with a plurality of first stripeds and a plurality of second stripeds, each first striped and each second striped self are staggered, and described first striped has different GTG degree with described second striped;
Photoelectric conversion unit is responded to the predetermined image on this display plane and is produced an electric signal with optical mode; And
Control circuit produces a flash signal according to the electric signal of this photoelectric conversion unit generation, and this display panel is adjusted flicker level according to this flash signal.
19. display panels flicker adjusting gear as claimed in claim 18, it is characterized in that: the GTG degree of described first striped is more than or equal to 0%, and be less than or equal to 40%, the GTG degree of described second striped is more than or equal to 60%, and is less than or equal to 100%.
20. display panels flicker adjusting gear as claimed in claim 19, described display panels flicker adjusting gear also comprises the memory control module, judges the minimum value of the flash signal of this control circuit output in order to record.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510084519 CN1900772A (en) | 2005-07-18 | 2005-07-18 | Method and device for regulating liquid crystal panel flash |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510084519 CN1900772A (en) | 2005-07-18 | 2005-07-18 | Method and device for regulating liquid crystal panel flash |
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| Publication Number | Publication Date |
|---|---|
| CN1900772A true CN1900772A (en) | 2007-01-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200510084519 Pending CN1900772A (en) | 2005-07-18 | 2005-07-18 | Method and device for regulating liquid crystal panel flash |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101783898A (en) * | 2010-03-08 | 2010-07-21 | 青岛海信电器股份有限公司 | Television |
| CN101950551A (en) * | 2009-07-09 | 2011-01-19 | 佳能株式会社 | Image display device and control method thereof |
| CN102708821A (en) * | 2012-05-17 | 2012-10-03 | 京东方科技集团股份有限公司 | Method and device for setting common electrode voltage |
| CN103366657A (en) * | 2013-07-17 | 2013-10-23 | 青岛海信电器股份有限公司 | Flicker regulating system |
| CN104766582A (en) * | 2015-04-24 | 2015-07-08 | 合肥京东方光电科技有限公司 | Regulating system, regulating method thereof and display device |
-
2005
- 2005-07-18 CN CN 200510084519 patent/CN1900772A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101950551A (en) * | 2009-07-09 | 2011-01-19 | 佳能株式会社 | Image display device and control method thereof |
| CN101950551B (en) * | 2009-07-09 | 2013-04-17 | 佳能株式会社 | Image display apparatus and method of controlling the same |
| US8576335B2 (en) | 2009-07-09 | 2013-11-05 | Canon Kabushiki Kaisha | Image display apparatus having flicker control and method of controlling the same |
| CN101783898A (en) * | 2010-03-08 | 2010-07-21 | 青岛海信电器股份有限公司 | Television |
| CN101783898B (en) * | 2010-03-08 | 2013-03-27 | 青岛海信电器股份有限公司 | Television |
| CN102708821A (en) * | 2012-05-17 | 2012-10-03 | 京东方科技集团股份有限公司 | Method and device for setting common electrode voltage |
| CN102708821B (en) * | 2012-05-17 | 2014-02-19 | 京东方科技集团股份有限公司 | Method and device for setting common electrode voltage |
| CN103366657A (en) * | 2013-07-17 | 2013-10-23 | 青岛海信电器股份有限公司 | Flicker regulating system |
| CN103366657B (en) * | 2013-07-17 | 2016-07-13 | 青岛海信电器股份有限公司 | Flicker regulates system |
| CN104766582A (en) * | 2015-04-24 | 2015-07-08 | 合肥京东方光电科技有限公司 | Regulating system, regulating method thereof and display device |
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