CN100442333C - Display apparatus and display method - Google Patents
Display apparatus and display method Download PDFInfo
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- CN100442333C CN100442333C CNB200510109645XA CN200510109645A CN100442333C CN 100442333 C CN100442333 C CN 100442333C CN B200510109645X A CNB200510109645X A CN B200510109645XA CN 200510109645 A CN200510109645 A CN 200510109645A CN 100442333 C CN100442333 C CN 100442333C
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Abstract
The invention discloses a display apparatus and display method. The display apparatus includes a plurality of optical modulators that display monochromatic images, respectively, an optical system that synthesizes the monochromatic images into a color image, a luminance non-uniformity correction unit that adjusts a correction coefficient according to a luminance to be displayed, and that corrects a luminance non-uniformity in the monochromatic image using the adjusted correction coefficient, and a color non-uniformity correction unit that adjusts a luminance balance among the monochromatic images per pixel or pixel block, thereby correcting a color non-uniformity in the color image.
Description
Technical field
The present invention relates to a kind of display device and display packing thereof, especially relate to the method for improving irregular colour and brightness disproportionation.
Background technology
Method as the irregular colour of revising display device, comprise that for example the spy opens in the flat 10-84551 communique (No. 3202613 communique of patent) disclosed such, display frame is divided into piece, even by the intensity level that makes the piece that is partitioned into, revise the method for the irregular colour that in display frame, produces.
In addition, open the spy and to disclose following method in the flat 09-200571 communique:, compare the correction when increasing low-light level during with the big high brightness of incoming video signal level by gain adjustment circuit and DC bias adjustment circuit.
Yet, open in the method for flat 10-84551 communique the spy, owing to, make the brightness of display frame integral body even, so there is the problem of the high-high brightness step-down of display frame by as one man reducing the brightness of the high part of brightness with the low part of brightness.
Open in the flat 09-200571 communique the spy, disclosing by resembling makes brightness evenly revise brightness disproportionation and irregular colour the so-called blackspot correction, and disclose when high brightness,, thereby adopted little correction to get final product because the brightness disproportionation irregular colour is not obvious.
, when high brightness, though brightness disproportionation is not obvious really, irregular colour is still obvious.Thereby, as the spy open put down in writing in the flat 09-200571 communique, when high brightness, only merely reduce correction, can not improve the image quality deterioration that irregular colour causes.
Display device, especially projection type image display apparatus (projector) are in order to improve the visuality at bright place, the high brightnessization of strong request display frame.On the other hand, be accompanied by giant-screenization, also strong request reduces irregular colour and brightness disproportionation., as mentioned above, prior art can't be taken into account the high brightnessization of display frame and the reduction of irregular colour and brightness disproportionation simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of display device and display packing, can under the situation of the high-high brightness that does not reduce demonstration, revise irregular colour.
And, the object of the present invention is to provide a kind of display device and display packing, can under the situation that the tangible low-light level of brightness disproportionation shows, revise brightness disproportionation and irregular colour simultaneously.
To achieve these goals, the present invention adopts following structure:
The 1st scheme of the present invention is a kind of display device, has:
The a plurality of optical modulation components that show monochrome image respectively;
Described monochrome image is synthesized the optical system of coloured image;
The brightness disproportionation correction portion is adjusted correction factor accordingly with the brightness that should show, uses this adjusted correction factor, revises the brightness disproportionation in the described monochrome image; With
The irregular colour correction portion by being that unit adjusts the luminance balance between described monochrome image with pixel or block of pixels, is revised the irregular colour in the described coloured image.
The 2nd scheme of the present invention is a kind of display packing, comes color display by synthetic a plurality of monochrome images, has following steps:
Adjust correction factor accordingly with the brightness that should show;
Use this adjusted correction factor, revise the brightness disproportionation in the described monochrome image; With
By being that unit adjusts the luminance balance between described monochrome image, revise the irregular colour in the described coloured image with pixel or block of pixels.
According to the present invention, can under the situation that does not cause display brightness to reduce, suitably improve the brightness disproportionation irregular colour of display image, show thereby can carry out high quality images.
Description of drawings
Fig. 1 is the side cross-sectional view of the rear projection type display apparatus of expression embodiment of the present invention.
Fig. 2 is the figure of the projection type display engine of expression embodiment of the present invention.
Fig. 3 is the block diagram of the rear projection type display apparatus of embodiment of the present invention.
Fig. 4 is the figure of the brightness disproportionation modification method of explanation prior art.
Fig. 5 is the figure of the modification method of the brightness disproportionation irregular colour of explanation embodiment of the present invention when incoming level is big.
Fig. 6 is the figure of the modification method of the brightness disproportionation irregular colour of explanation embodiment of the present invention when incoming level median size.
Fig. 7 is the figure of explanation embodiment of the present invention at the modification method of the brightness disproportionation irregular colour of incoming level hour.
Fig. 8 is the block diagram that carries out the circuit of the brightness disproportionation correction of embodiment of the present invention and irregular colour correction.
Fig. 9 is the figure of an example of expression adjusting point.
Embodiment
Below, describe preferred forms of the present invention for example in detail with reference to accompanying drawing.Wherein, the size of the component parts of putting down in writing in the present embodiment, material, shape, its relatively configuration etc. be not limited to specific record especially, and do not mean scope of the present invention only limited to this.
Fig. 1 is a sectional view of seeing the rear projection type display apparatus 200 of present embodiment from the side.In Fig. 1, by catoptron 201 reflections, project to the back side of screen 6 then from the image of projection type display engine D1 projection.In the front of screen 6 digital quantizer 202 is installed.Digital quantizer 202 will be input to display device 200 from the location coordinate that the front of screen 6 is imported with pen 203 by digital quantizer.As digital quantizer 202, can use various converters such as optical profile type, pressure sensing type or ultrasonic type.It is the SW (switch) that is used to indicate the light and shade of display frame that light and shade is adjusted SW204.
Fig. 2 represents projection type display engine D1.Projection type display engine D1 use R, the G of Fig. 2,3 liquid crystal panel 2R, 2G of B demonstration usefulness of all kinds, 2B are as optical modulation element.With these 3 liquid crystal panel 2R, 2G, 2B be configured in cross prisms 7 opposed positions on.Cross prisms 7 are to synthesize monochrome (R, G, the B) image that shows in liquid crystal panel 2R, 2G, 2B, the optical system that forms full-colour image.In addition, in the present embodiment,, use the TN liquid crystal panel that utilizes TFT to drive as liquid crystal panel 2R, 2G, 2B.In addition, clip each liquid crystal panel 2R, 2G, 2B, and penetrate side configuration projecting lens 9 or screen (being projected parts) 6 at the light of cross prisms 7 respectively at the both sides of each liquid crystal panel configuration Polarizer 8.
Configuration par reflecting device 10 makes it surround lamp 1 (light source).This reverberator 10 will convert parallel beam to from the emergent light of lamp 1.In addition, this reverberator 10 can not be a parabolic type also.For example, also can convert thereof into convergent beam by disciform reverberator.Lamp 1 can use metal halide lamp or xenon lamp etc.
On the light path of the light that penetrates from lamp 1, become conjugate relation ground configuration fly's eye integraph 40,41 with liquid crystal panel 2R, 2G, 2B, be used to improve the unevenness of light source.
And, at the light emitting side of fly's eye integraph 40,41, dispose relay lens 11 and catoptron 12 successively.And, dispose 2 dichronic mirrors 13,14, relay lens 15, catoptron 16,17,18.By these optical systems, will be branched off into 3 from the emergent light of lamp 1, and guide to each liquid crystal panel 2R, 2G, 2B.In addition, symbol 19 expression field lenss.
Here, the V-T curve of each liquid crystal panel 2R, 2G, 2B is in face under the inconsistent situation, or by the light of lamp 1 irradiation under different situation on each liquid crystal panel 2R, 2G, the 2B, or because under the different situation of characteristic difference, projected light of projection optical system, as described later, the image quality deterioration of the irregular colour of generation display image or brightness disproportionation etc.
Video signal processing unit shown in Figure 33 grades are connected on above-mentioned liquid crystal panel 2R, 2G, the 2B.
Fig. 3 is the block diagram of the rear projection type display apparatus 200 of expression present embodiment.In Fig. 3, video signal processing unit 3 is set in rear projection type display apparatus 200.Video signal processing unit 3 comprises: signal processing circuit 52; Switch 30; A/D converter 31; DSP32; Keep current video data and the storer 33 of data presented etc. in next frame; Timing generation circuit 34; Conversion of resolution portion 101; Be stored in the storer 102 of the video data that uses in the correction of brightness disproportionation irregular colour; Brightness disproportionation irregular colour correction portion 103; D/A converter 35; With the signal that puts on each liquid crystal panel 2R, 2G, the 2B and the drive circuit (panel driver) 36 of power supply are provided.In DSP32, display images such as degree of comparing, lightness adjustment or color conversion are handled.
In the present embodiment, explanation be light and shade to be adjusted SW test section 109, digital quantizer test section 118, USB I/F107 etc. be connected in the situation of CPU63, but also can be built among the CPU, or carry out by program.
(existing brightness disproportionation modification method)
Fig. 4 represents the brightness disproportionation modification method of prior art.
Fig. 4 (A) is the preceding input signal of brightness disproportionation correction and the example of display brightness thereof.The longitudinal axis of input signal is represented level, and transverse axis is represented the location of pixels of horizontal direction.The longitudinal axis of display brightness is represented brightness, and transverse axis is represented the location of pixels of horizontal direction.When whole pixels have been imported the signal of same level, in the demonstration before correction, the brightness height of display part core, the display brightness of two end portions is low.If such brightness disproportionation is excessive, then the image quality of display image reduces.
Fig. 4 (B) expression is used to revise the correction factor (corrected signal) of prior art of the brightness disproportionation of Fig. 4 (A).This correction factor is got maximal value (for example, 100%) to the minimum two end portions of brightness, and more little value is got in the brightness high more center of display part (more near).Signal times before revising with this corrected signal after, the signal level of low-light level part (picture two end portions) is constant, but the signal level of hi-lite (picture middle body) is reduced to the degree identical with the low-light level part.
Fig. 4 (C) is the example of revised input signal and display brightness thereof.By reducing the signal level of picture middle body, the display brightness of picture middle body becomes and two end portions brightness much at one.Thus, as picture integral body, can obtain uniform brightness.
, so existing method has as one man reduced the brightness of hi-lite with the low-light level part after revising, so the problem that exists the brightness (high-high brightness MAX) of whole image to reduce.
(the brightness disproportionation modification method of present embodiment)
Fig. 5, Fig. 6, Fig. 7 are the examples of the brightness disproportionation irregular colour correction of expression present embodiment.In the present embodiment, correspondence is input to the level of the signal of brightness disproportionation correction circuit, changes the effect of brightness disproportionation correction.Fig. 5 is the example of the level (intensity level) of input signal when big, and Fig. 6 is that intensity level is broad in the middle hour a example, and Fig. 7 is the example of intensity level hour.
Shown in Fig. 5 (A), under the situation of having imported the big signal of intensity level, shown in Fig. 5 (B), select the little brightness disproportionation correction factor of correction.Do not exist because the difference of the correction that the difference of display position causes.In this example, using correction is zero correction factor, shown in Fig. 5 (C), exports under the situation of not carrying out the brightness disproportionation correction.Thereby high-high brightness MAX does not reduce.At this moment, the processing below carrying out in the irregular colour correction portion is to carry out the little demonstration of colour difference.
Fig. 7 (A)～(C) is the example of having imported under the situation of the little signal of intensity level.At this moment, select the big brightness disproportionation correction factor of correction, identical with Fig. 4 (A)～(C) of conventional example, revise fully, so that the brightness of picture integral body is even.
Fig. 6 (A)～(C) has imported intensity level to be the example under the situation of the signal of middle size.The level of corresponding input signal is set in correction effect the centre of the effect of the effect of Fig. 5 (A)～(C) and Fig. 7 (A)～(C).
By to multiply by the adjusted value that the corresponding brightness level is set, calculate the brightness disproportionation correction factor from the original correction factor of storing the storer output of correction factor accordingly with locations of pixels information.
(structure of brightness disproportionation irregular colour correction portion)
Fig. 8 is the block diagram that carries out the circuit of the brightness disproportionation correction of present embodiment and irregular colour correction.
Positional information generating unit 601 is according to the horizontal-drive signal HSYNC and the vertical synchronizing signal VSYNC that carry out video signal displayed, carry out the counting of horizontal direction and vertical direction, the timing of corresponding vision signal and corrected signal offers brightness disproportionation correction factor storage part 603 with storage address.Thus, read the correction factor of pixel position corresponding (adjusting point).
Monochrome information extracting part 602 is calculated the adjusted value of ratio (size of the correction) variation that is used to make correction factor according to display brightness information.Specifically, monochrome information extracting part 602 calculate when display brightness is big correction little, at the big adjusted value of display brightness hour correction.So-called display brightness information is the index of the size of the expression brightness that should show.In the present embodiment, the intensity level of the vision signal of input is used as display brightness information.
Brightness disproportionation correction factor insertion section 604 is by inserting the correction factor of adjusting point, exports after calculating the correction factor corresponding to each pixel of display position.
Brightness disproportionation correction operational part 605 multiply by the brightness disproportionation correction factor by the vision signal that makes input, carries out the correction of brightness disproportionation.Here, the brightness disproportionation correction factor is by making the correction factor of being calculated by brightness disproportionation correction factor insertion section 604 multiply by the resulting value of the adjusted value of being calculated by monochrome information extracting part 602.Thus, when the intensity level height (display brightness is big) of the signal of importing, the degree of brightness disproportionation correction is little, and when the intensity level low (display brightness is little) of the signal of importing, the degree of brightness disproportionation correction is big.
The level of vision signal detects in level detection portion 606.The signal level of irregular colour correction factor insertion section 608 corresponding R, G, B, read the irregular colour correction factor of each adjusting point from irregular colour correction factor storage part 607, after inserting these correction factors, calculate the irregular colour correction factor of each pixel or each block of pixels.Make the revised input signal of brightness disproportionation add and subtract the irregular colour correction factor of calculating by irregular colour correction operational part 609.
With reference to Fig. 9, be illustrated in brightness disproportionation correction factor storage part 603 or the irregular colour correction factor storage part 607 example of setting along the correction factor (correction data) of level and vertical direction, the adjusting point that forms behind the divided frame at certain intervals.Fig. 9 represents the vision signal of the XGA display standard of 1024 point * 768 lines is divided into 9 points at 128 at horizontal direction interval, 7 situation of vertical direction interval 128 lines.At this moment, in RAM, set the data that amount to 63 adjusting point P in the picture.As mentioned above, by inserting the correction factor of the adjusting point P that is stored along level and vertical direction, calculate correction factor at each pixel by coefficient insertion section 604,608.Thus, compare, can cut down memory space with the correction factor of the whole pixels of storage.
In addition, preferably the correction factor of each incoming level is stored in brightness disproportionation correction factor storage part 603 and the irregular colour correction factor storage part 607.
In order to cut down the memory space of incoming level direction, also can be by cutting apart incoming level, storage is corresponding to the correction factor of each level after cutting apart.At this moment, the level by the vision signal of input detects in monochrome information extracting part 602 or level detection portion 606 inserts correction factor by brightness disproportionation coefficient insertion section 604 or irregular colour coefficient insertion section 608 along the incoming level direction.
As mentioned above, the interpolation of the level direction of the interpolation of the level of location of pixels and vertical direction and input signal can be carried out in coefficient insertion section 604,608.
In addition, as interpolation method, can use neighbour's the whole bag of tricks such as (nearest neighbor) method of interpolation, linear interpolation method, cube method of interpolation or spline method of taking a sample.
Below, explain the modification method of brightness disproportionation.
(existing brightness disproportionation modification method)
If (x, high-high brightness y) is K to each pixel
Max(x, y), the brightness of the pixel that brightness is minimum is K
Max(min), when the level of incoming video signal is Din, if the level Dout of the signal after the correcting process is satisfied by correction
Dout?＝(K
max(min)/K
max(x，y))×Din
Then can make display brightness Kout in picture, become even.
As K
Max(min), preferably do not select the brightness of abnormal pixels such as defect pixel.For example, Luminance Distribution that can reference pixels, the brightness value that will have the brightness value intermediate value minimum of the regulation number of degrees (pixel count) is set at K
Max(min).
Therefore, as long as R, G, each panel of B carry out these processing, just can there be the demonstration of brightness disproportionation.
Yet, because the maximal value of revised brightness Kout is K
Max(min), so the problem that reduces greatly before existing the high-high brightness ratio of picture integral body to revise.
(the brightness disproportionation modification method of present embodiment)
Thereby in the present embodiment, the level of brightness disproportionation irregular colour correction portion 103 corresponding input signals changes the ratio of brightness disproportionation correction.
For example, at the level ratio specified level D of input signal
RefWhen high, establish
Dout＝Din
Carry out the brightness disproportionation correction.
In addition, the level at input signal is specified level D
RefWhen following, establish
Dout＝(K
max(min)/K
max(x，y))×Din
Carry out the brightness disproportionation correction.
Here, (K
Max(min)/K
Max(x, y)) is the brightness disproportionation correction factor.
In addition, as other modification method, the proportional linearity ground of brightness disproportionation correction is changed.
At incoming signal level is specified level D
RefWhen following, identical with above-mentioned example, establish
Dout?＝(K
max(min)/K
max(x，y))×Din
Revise so that brightness is even.
On the other hand, at incoming signal level than specified level D
RefWhen high, establish
Dout?＝((K
max(min)+(K
max(x，y)-K
max(min))×((Din-D
ref)/(D
max-D
ref)))/K
max(x，y))×Din。
Wherein, D
MaxMaximal value for incoming signal level.
As mentioned above, as Fig. 5～shown in Figure 7, can make the ground variation of the corresponding incoming signal level of correction factor.
In said method, the level of the corresponding input of the ratio of brightness disproportionation correction changes linearly.But, the method that preferably adopts the ratio of brightness disproportionation correction non-linearly to change.For example, if make correction factor storage part 603 store the corresponding expectation coefficient of each level with input signal in advance, the ratio of brightness disproportionation correction is at random changed.
(the irregular colour modification method of present embodiment)
Below, the irregular colour modification method of embodiment of the present invention is described.The irregular colour modification method of present embodiment does not make the brightness unanimity of picture integral body, but changes the color disperse of revising in the picture by little brightness.In the method, the color distortion between pixel (or block of pixels) preferentially is inhibited than the brightness disperse between pixel (or block of pixels).
Existing method makes the brightness unanimity of picture integral body at each R, G, B panel, and the result has eliminated irregular colour.But as mentioned above, existing method causes display brightness to reduce.
In contrast, as Fig. 5～shown in Figure 7, the irregular colour modification method of present embodiment is unit with the pixel or is unit with the block of pixels (neighbor group) that is made of a plurality of (for example 10) neighbor, makes the luminance balance unanimity of the signal of R, G, B.Though the display brightness (lightness) between pixel (or block of pixels) is inhomogeneous, the difference of the colourity between pixel (or block of pixels) (form and aspect, chroma) diminishes.Thus, can under the situation that does not cause display brightness to reduce, improve the irregular colour of display image.
In the present embodiment, owing to carry out the irregular colour correction after the brightness disproportionation correction, irregular colour specific luminance inequality preferentially obtains revising.Though there is the possibility that produces brightness disproportionation (becoming big) because of the irregular colour correction, as described later, because people's vision is to irregular colour comparison brightness disproportionation sensitivity, so not too become problem.In addition, in order suitably to keep the effect of brightness disproportionation correction, preferably the correction (coefficient value) with the irregular colour correction is limited in the specialized range.
Preferably, in the irregular colour correction, not only reduce one of them the level (reduction ratio) of signal of R, G, B, also improve the level (increase coefficient) of the signal of one of them, thereby adjust the luminance balance of R, G, B.For example, being adjusted at 1: 1: 1 o'clock from 3: 1: 1 at the luminance balance with R, G, B, is not the level that only reduces the R signal, also in the level that reduces the R signal, improves the level (for example, becoming 2: 2: 2) of G signal and B signal.Thus, realize having kept the irregular colour correction of high brightness.
The brightness disproportionation irregular colour modification method of present embodiment utilizes following human vision property.
(1) human vision is to irregular colour comparison brightness disproportionation sensitivity.Therefore, specific luminance is uneven revises and preferentially carries out irregular colour correction (intensity level of modified R, G, B and suppress irregular colour independently is to adjust the modification method of color balance at each pixel or each block of pixels).
(2) human vision compares when brightness is high the luminance difference sensitivity when brightness is low.Therefore, under the high situation of the intensity level of incoming video signal, compare, reduce the brightness disproportionation correction with the situation that intensity level is low.
In the present embodiment, the level that is to use incoming video signal of explanation is as display brightness information, and the method that the ratio of brightness disproportionation correction is changed with the level of input signal.But, as display brightness information, also can use the vision signals such as mean flow rate, maximal value or minimum value of picture integral body have been carried out the value that obtains after the statistical treatment, also can use not according to incoming video signal but adjust the brightness adjusted value of the operating and setting of switch, also can use the indicated value of the various indicating devices of change display frame brightness by brightness.
In the present embodiment, carry out brightness disproportionation correction and irregular colour correction successively by different circuit.But, preferably revise brightness disproportionation and irregular colour by 1 correcting process of 1 correction circuit.In this case, also can suitably adjust the correction (correction factor) of brightness disproportionation correction and irregular colour correction, to change correction effect accordingly with display brightness information.
Claims (7)
1, a kind of display device has:
The a plurality of optical modulation components that show monochrome image respectively;
Described monochrome image is synthesized the optical system of coloured image;
The brightness disproportionation correction portion is adjusted correction factor accordingly with the brightness that should show, and uses this adjusted correction factor to revise the interior brightness disproportionation of described monochrome image; With
The irregular colour correction portion by being that unit adjusts the luminance balance between described monochrome image with pixel or block of pixels, is revised the irregular colour in the described coloured image,
Wherein said irregular colour correction portion is to implementing the irregular colour correction by the revised vision signal of described brightness disproportionation correction portion.
2, display device according to claim 1 is characterized in that:
Described brightness disproportionation correction portion is adjusted described correction factor, so that when the described brightness that should show is big, do not suppress brightness disproportionation, and in the described brightness that should show hour, suppresses brightness disproportionation.
3, display device according to claim 1 is characterized in that:
Described brightness disproportionation correction portion is at the level of the described brightness that should show during more than or equal to specified level, adjust described correction factor so that the correction of brightness disproportionation diminishes, and during less than described specified level, do not adjust described correction factor at the level of the described brightness that should show.
4, display device according to claim 1 is characterized in that:
The described brightness that should show is the intensity level of incoming video signal.
5, display device according to claim 1 is characterized in that:
Mean value, maximal value or minimum value that the described brightness that should show is the intensity level of incoming video signal.
6, display device according to claim 1 is characterized in that:
Described irregular colour correction portion is limited in the correction of irregular colour correction in the specialized range.
7, a kind of display packing is come color display by synthetic a plurality of monochrome images, has following steps:
Adjust correction factor accordingly with the brightness that should show;
Use this adjusted correction factor, revise the brightness disproportionation in the described monochrome image; With
By being that unit adjusts the luminance balance between described monochrome image with pixel or block of pixels, revise the irregular colour in the described coloured image,
Wherein in described irregular colour correction step, revised vision signal in described brightness disproportionation correction step is implemented the irregular colour correction.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2004266725 | 2004-09-14 | ||
| JP2004266725 | 2004-09-14 | ||
| JP2005202694 | 2005-07-12 |
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| Publication Number | Publication Date |
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| CN1750075A CN1750075A (en) | 2006-03-22 |
| CN100442333C true CN100442333C (en) | 2008-12-10 |
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| CN102402944B (en) * | 2011-12-20 | 2014-11-12 | 深圳市奥拓电子股份有限公司 | Point-by-point correcting system and point-by-point correcting method for LED display screen |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09200571A (en) * | 1996-01-18 | 1997-07-31 | Matsushita Electric Ind Co Ltd | Video signal processor |
| JPH1084551A (en) * | 1996-09-06 | 1998-03-31 | Nec Corp | Uneven color correction device |
| JP2000315070A (en) * | 1999-04-28 | 2000-11-14 | Matsushita Electric Ind Co Ltd | Full color display |
| US20020012104A1 (en) * | 2000-06-30 | 2002-01-31 | Seiko Epson Corporation | Projector |
| CN1450801A (en) * | 2002-04-05 | 2003-10-22 | 株式会社日立制作所 | Contrast adjusting circuit and video display apparatus using same |
| CN1127263C (en) * | 2000-12-07 | 2003-11-05 | 康佳集团股份有限公司 | Correction method for uniform bright field of CRT projection TV |
-
2005
- 2005-09-14 CN CNB200510109645XA patent/CN100442333C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09200571A (en) * | 1996-01-18 | 1997-07-31 | Matsushita Electric Ind Co Ltd | Video signal processor |
| JPH1084551A (en) * | 1996-09-06 | 1998-03-31 | Nec Corp | Uneven color correction device |
| JP2000315070A (en) * | 1999-04-28 | 2000-11-14 | Matsushita Electric Ind Co Ltd | Full color display |
| US20020012104A1 (en) * | 2000-06-30 | 2002-01-31 | Seiko Epson Corporation | Projector |
| CN1127263C (en) * | 2000-12-07 | 2003-11-05 | 康佳集团股份有限公司 | Correction method for uniform bright field of CRT projection TV |
| CN1450801A (en) * | 2002-04-05 | 2003-10-22 | 株式会社日立制作所 | Contrast adjusting circuit and video display apparatus using same |
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