CN100524447C - Display apparatus and its control method - Google Patents
Display apparatus and its control method Download PDFInfo
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- CN100524447C CN100524447C CNB2006100051225A CN200610005122A CN100524447C CN 100524447 C CN100524447 C CN 100524447C CN B2006100051225 A CNB2006100051225 A CN B2006100051225A CN 200610005122 A CN200610005122 A CN 200610005122A CN 100524447 C CN100524447 C CN 100524447C
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Abstract
The invention discloses an image display apparatus having a display device and a signal processing circuit for performing a signal processing according to a size of region of a predetermined color in an image to be displayed. The invention also discloses an image display apparatus having: a display device; and a signal processing circuit, wherein when a first image having a region to be displayed in a predetermined color and a predetermined brightness, that is, a first region in which a width in a predetermined direction is equal to a first value and a second image which is an image in which average luminance of a whole image is the same as that of the first image and which has a region to be displayed in the same color as the predetermined color and in the predetermined brightness, that is, a second region in which a width in the predetermined direction is larger than the first value are respectively displayed, the brightness of the first region in the first image is brighter than that of the second region in the second image by the signal processing in the signal processing circuit.
Description
Technical field
The present invention relates to the image display device that the image quality of display image is improved.
Background technology
So far, there is the following technology that in limited dynamic range, shows the image of high-contrast.
Entire display screen is divided into a plurality of zones and vision signal that each the is regional technology (for example, referring to JP-A No.2004-048185) to be expanded with the irrelevant mode of other regional vision signal and to be proofreaied and correct by gamma (γ) according to the distribution of the brightness value of the vision signal of target area.
Change the technology (for example, referring to JP-A No.2002-333858) of dynamic range according to average level for white peak (white peak) characteristic that realizes similar CRT.
Summary of the invention
The objective of the invention is to, realization can be carried out image display device or the manufacturing method of anm image displaying apparatus that shows preferably.According to the following embodiment that explains of the present invention, can improve contrast sense (feeling), more specifically, the structure example that can improve the brightness impression of particular coloured regions is illustrated.
Can mention that following example is as the object lesson that can be solved by the structure of following each embodiment that explains of the present invention.
For example, in above-mentioned conventional method,
According to the zone in the display screen cut apart and the vision signal of target area with the method that is expanded with the irrelevant mode of other regional vision signal and the distribution of the brightness value of the vision signal in based target zone is proofreaied and correct by γ, though with in the entire display screen curtain in a lump the γ situation of proofreading and correct compare the contrast sense and be improved, but in the zone of respectively cutting apart, gain still is subjected to the inhibition of one of a plurality of white peaks.Therefore, the problem that has the part that contrast sense deficiency occurs.
According to dynamic range according to the reformed method of average level, because the problem that gain to be determined with irrelevant mode such as the area of white peak, width, therefore exists the brightness impression of the white in a plurality of white peaks parts fully not showed.
About one of invention of the present invention be constructed as follows.That is,
A kind of image display device is used for based on the view data display image, and this image display device comprises:
Be used for detecting the pick-up unit of size of the color region of predetermined color based on view data;
Be used for conversion equipment according to the view data of the size conversion color region of color region.
About another be constructed as follows of invention of the present invention, that is,
A kind of image display device comprises:
Display device; With
Be used for carrying out the signal processing circuit of signal Processing according to the size in the zone of the predetermined color of the image that will show.
The size in the zone of color is not limited to the area in this zone, but comprises the size (width) along predetermined direction.Be not limited to size according to the zone according to the processing of the size in zone and make the different structure of treatment capacity (correcting value).For example, this processing comprises a kind of like this structure,, in this structure, though carry out specific processing under the situation of preliminary dimension, does not carry out specific processing under the situation of another size that is.
Another be constructed as follows about invention of the present invention.That is,
A kind of image display device comprises:
Display device; With
Signal processing circuit,
Wherein, (a) under such a case at least, that is, image is shown that by first picture signal first area that this first picture signal specifies first image to have predetermined color and predetermined luminance, first area have along first width of predetermined direction, and
(b) under such a case at least, promptly, image is shown by second picture signal, this second picture signal specifies second image to have the second area of predetermined color and predetermined luminance, described second image equals the image of described first image for the mean flow rate of its entire image, second area has along predetermined direction second width bigger than first width
By the signal Processing in the signal processing circuit, the brightness height of the second area in the image that the brightness ratio of the first area in the image that is shown by first picture signal is shown by second picture signal.
Preferably, signal processing circuit has change-over circuit, and this change-over circuit is used for based on the controlling value conversion image data according to the quantity of the pixel of continuous predetermined color.
According to the present invention, in the display device such as CRT, LCD or PDP etc., contrast sense and brightness impression can improve.
Description of drawings
Fig. 1 is the diagrammatic sketch of expression according to the rear projection type display apparatus of the first embodiment of the present invention;
Fig. 2 is the diagrammatic sketch of expression according to the projection type display engine of first embodiment;
Fig. 3 is the block diagram according to the image display device of first embodiment;
Fig. 4 is the signal Processing block diagram that comprises according to the white peak correcting unit of first embodiment;
Fig. 5 A1,5A2,5A3,5B1,5B2 and 5B3 are the key diagrams that is used to explain according to the white peak bearing calibration of first embodiment;
Fig. 6 A1,6A2,6A3,6B1,6B2 and 6B3 are the key diagrams that is used for the interpretation routine bearing calibration.
Embodiment
(first embodiment)
Fig. 1 is the lateral elevational view of rear projection type display apparatus 200 of the present invention.
From be reflected mirror 201 reflections and be projected of the image of projection type display engine D1 projection from the rear surface of screen 6.Aristogrid 202 is fixed on the front surface of screen 6.Be imported into display device 200 for the position coordinates of Aristogrid input from the front surface of screen 6 by pen 203.The Aristogrid that can use optical type, pressure sensitive, ultrasonic type etc. is as Aristogrid 202.
Switch (SW) the 204th is adjusted in brightness, is used to indicate the switch of the brightness of display screen.
According to the projection type display engine D1 among Fig. 2, show that with the colour of R, G and B corresponding three liquid crystal panel 2R, 2G and 2B are used as optical modulation device (display device).Three liquid crystal panel 2R, 2G and 2B are configured on the position in the face of the surface of beam split (cross) prism 7.Can be used as liquid crystal panel 2R, 2G and 2B with lower panel: by using TN (twisted-nematic) the type liquid crystal panel of the driven active matrix of TFT (active matrix) type; Can carry out the active array type ferroelectric liquid crystals panel of high speed operation; OCB (light compensated bend (Optically Compensated Bend)) liquid crystal panel etc.Polaroid (polarizingplate) 8 is configured in each the both sides of liquid crystal panel 2R, 2G and 2B, respectively each panel is clipped in therebetween.Projecting lens 9 and screen (member that is projected) 6 is configured in the light emitting side of Amici prism 7.
Fly's eye (fly ' s eys) integrator 40 and 41 is configured on the light path of the light of lamp 1 emission, and having conjugation (conjugate) relation with liquid crystal panel 2R, 2G and 2B, and the unevenness of light source is enhanced.
The processing of the electric signal in the projection type display engine of explanation present embodiment now.Fig. 3 is a block diagram according to an embodiment of the invention.
Be transfused to apparatus for processing of video signals 3 from the vision signal of personal computer (PC) 300 output with from TV (TV) signal of broadcast wave demodulation by PC input end 50 and NTSC input end 51, and any of vision signal or TV signal selected by switch 30.The picture signal of selecting is sent to peak (peak) correcting unit 103 by A/D converter 31, DSP32 and resolution converter (resolutionconverter) 101.The view data of storer 33 storage current images data and next frame.The peak image correcting data is converted into simulating signal and is transfused to panel driver 36 by D/A converter 35.Panel driver 36 is supplied with drive signal based on view data to liquid crystal panel 2R, 2G and 2B respectively.
In DSP unit 32, handle to be performed such as the display image of contrast adjustment, brightness adjustment and color conversion.
Though analog input signal only is shown in this block diagram, the invention is not restricted to this, the present invention also can be effectively applied in the input terminal that LVDS, TMDS etc. are provided, be used for the structure of the D4 terminal etc. of Digital Television.
Signal Processing, noise reduction process, band that signal processing circuit 52 is carried out such as the decoding of NTSC signal are limit filtering (band limitation filtering), signal level adjustment etc.
Ballast resistor (ballast) the 57th, the lamp power supply that is connected with lamp 1.System power supply 58 from AC port 60 to the total system supply capability.Telepilot 61 is devices that the user is used to carry out the various operations of display device.Control panel 62 receives the signal that sends from telepilot 61.
The operation that switch detecting unit 109 sensed luminance are adjusted switch 204 is adjusted in brightness.Aristogrid detecting unit 118 detects by Aristogrid 202 specified coordinate.
Though on switch detecting unit 109, Aristogrid detecting unit 118, USB I/F 107 etc. and CPU 63 connection basis are adjusted in hypothesis brightness, present embodiment has been described, also can have constructed them to be built among the CPU or by the mode that program is carried out.
PC 300 comprises: CPU 301; HD (hard disk) 302; RAM 303; ROM 304; Video memory 305; Graphics controller 306; Mouse I/F 307; USB I/F 308 etc.PC 300 has video output terminal 309, USB input terminal 310 and mouse input terminal 311.Mouse 312 is connected with mouse input terminal 311.
Referring now to Fig. 5 and Fig. 6 the principle of proofreading and correct according to the white peak of present embodiment is described.
Fig. 6 A1,6A2,6A3,6B1,6B2 and 6B3 represent the example that conventional dynamic range improvement is proofreaied and correct.Demonstration example before Fig. 6 A1,6A2 and 6A3 represent to proofread and correct.Fig. 6 B1,6B2 and 6B3 represent the demonstration example after the correction corresponding with the demonstration example of Fig. 6 A1,6A2 and 6A3.The longitudinal axis is represented display brightness, and transverse axis is represented the position of along continuous straight runs.Dotted line represents respectively to show the average level (APL) of example, shown in the conventional example of Fig. 6 A1,6A2 and 6B3, only carrying out under the situation of the processing that changes the dynamic range that shows according to mean flow rate, when average level is low as among Fig. 6 A1, can improve contrast by as shown in Fig. 6 B1, increasing the gain of white peak.On the contrary, when average level was high as among Fig. 6 A2, gain was not changed, and contrast can be enhanced according to the size of white portion (white region).But under the situation of Fig. 6 A3, because mean flow rate equals the mean flow rate among Fig. 6 A2, therefore, although white peak has narrower zone, contrast is not enhanced yet.
On the other hand, according to the present invention, because this device has the pick-up unit of the size that is used to detect white portion, therefore, gray scale (gradation) is changed according to the size of white portion.
Fig. 5 A1,5A2,5A3,5B1,5B2 and 5B3 represent to improve the example of proofreading and correct according to dynamic range of the present invention.Demonstration example before Fig. 5 A1,5A2 and 5A3 represent to proofread and correct.Fig. 5 B1,5B2 and 5B3 represent the demonstration example after the correction corresponding with the demonstration example of Fig. 5 A1,5A2 and 5A3.When white portion is narrower as Fig. 5 A1 and Fig. 5 A3,, all carry out the processing of the gain that is used to increase white peak no matter average level (APL) is much.Shown in Fig. 5 A2, when the white portion broad, carry out the not reformed processing of gain in the mode similar to conventional example.
Fig. 4 is the block diagram of the details of expression white peak correcting unit 103.
Peak detecting unit 401 detects white peak from the area of threshold value and white portion.Threshold value is determined by the histogram or the mean flow rate of the view data that will show.
Size Control gray-scale Control unit 403 and the white balance control module 404 of control module 402 according to the white portion that is detected by peak detecting unit 401 proofreaied and correct at the peak.
Gray-scale Control unit 403 conversion image datas increase the view data that is judged as the white peak part of white peak by peak detecting unit 401 with the amplitude according to white peak.
If brightness has reached maximal value, further increase display brightness by changing white balance so by white balance control module 404.In color diffusion (color diffusion) unit 405, when white balance by white balance control module 404 when predetermined white balance is changed, and be diffused into the neighboring area from the corresponding color of the side-play amount of predetermined white balance.
In V-T correcting unit 406, carry out the correction of V-T curve according to the characteristic of liquid crystal panel.
Below explain in detail.
Vision signal R, the G of each of the pixel that detecting unit 401 detections in peak are transfused to and the ratio of B judge thus whether color of pixel is achromaticity (achromatic color).In the present example, the pixel that is formed by the ratio of each signal of R, G, B be equal to or less than 5% signal of (in other words, be used to form the difference that has the value of peaked signal among signal R, the G of a pixel and the B and have between the value of signal of minimum value and be equal to or less than peaked 5%) is used as the achromaticity processes pixel.Then, determine whether the signal that is judged as achromatic pixel becomes the target that will carry out the white peak processing.Intensity level is compared with the average level (APL) of incoming video signal, and the pixel that intensity level is higher than APL is set as the object pixel that white peak is handled.That is, in the achromaticity pixel, the pixel that intensity level is higher than APL is regarded as the pixel of predetermined color (being white in the present embodiment).Calculate the quantity of the successive objective pixel of white peak processing.Count value control white peak according to the size of indicating white portion is handled.
In the present embodiment, be equal to or less than at 20 o'clock at the counting Kw of white peak object pixel and carry out the white peak processing.The intensity level of white increases by 10% when supposing Kw=1, and at K
wBe set as 1 times value at=21 o'clock, the arithmetical operation of white peak processing is as follows so.
Rout＝{1+f(Kw)}·Rin
Gout＝{1+f(Kw)}·Gin
Bout＝{1+f(Kw)}·Bin
Here,
f(Kw)＝(20-(Kw-1))/200
1+f (Kw) represents gain.
The linear mode that changes of white peak recruitment is provided with intensity level when in the present embodiment, being equal to or less than 20 with the counting Kw when the white peak object pixel.But the video scenery that maybe will show by the characteristic according to display device changes above-mentioned function f (Kw), can carry out the white peak of the most suitable display device or video scenery and proofread and correct.Though the value of using 20 pixels here is as the threshold value that is used to judge whether the peak processing is performed, this value can suitably be provided with.Preferred 5% the value that is equal to or less than along the sum of the pixel of predetermined direction (being horizontal direction here) of using.In this structure example, kw is input in the arithmetical operation of white peak processing as controlling value.When count value is equal to or greater than 22, do not carry out above-mentioned treatment for correcting at the arithmetic circuity that is used for the white peak processing.Especially, in the present embodiment, this device is constituted as and makes and can adjust the degree of proofreading and correct according to count value Kw.Also can construct this device in such a way, promptly, only be equal to or less than under the situation of predetermined value or under its situation, produce controlling value greater than predetermined value (being equal to or greater than predetermined value) in count value (for example 1 or 0), perhaps/and, whether evenly proofread and correct according to the existence of controlling value.
About the quantity of the white pixel of calculating along continuous straight runs and carry out the example that white peak proofreaies and correct embodiment has been described.By this method, can carry out correction according to the size (width) of the white portion of along continuous straight runs.Particularly, can be set as under the situation of first and second images of identical value APL and carry out following control.Here mention following situation as an example: first image have as the white portion that will be shown with predetermined brightness and wherein the width of along continuous straight runs be equal to or less than the zone of preset width (being 20 pixels) here, and second image have as will be shown with the brightness identical with predetermined brightness and wherein the width of along continuous straight runs greater than the zone of preset width.In the image of actual displayed in this case, the brightness Be Controlled makes the brightness height in zone of brightness ratio second image in the zone of the image of winning.Relativeness is represented in the bright statement of the another kind of brightness of a kind of brightness ratio.That is, make the brightness deepening in zone of second image, can control and make that the brightness in the zone of sensation first image is higher relatively by control.
By the quantity of a plurality of line storages (line memory) and calculating pixel vertically is set, the white peak that can carry out is vertically proofreaied and correct.
By size based on the number of computations decision white portion of the number of computations of the white peak pixel of along continuous straight runs and white peak pixel vertically, and determine the white peak correcting value by the size of the white portion that obtains based on mode with two dimension, can more effectively carry out white peak and proofread and correct.
Make the operation of Balance Control unit 404 and color diffusion unit 405 now clear.
Usually, in many display device, white balance can be changed.The display device of the value in existence can become colour temperature from about 6500 ° low colour temperature to the scope of about 9500 ° high colour temperature.And, exist the user can be per 500 ° wait the display device of adjusting colour temperatures.
Give each the gain of signal level of RGB panel by change, carry out the adjustment of colour temperature.
For example, under the situation of R:G:B=1:1:1, owing to tone must be made as shallow basket look in order to obtain 9500 °, therefore, by reducing the gain of R and G, ratio (R:G:B) becomes R:G:B=8:8:10 when 6500 ° the time.
Therefore, because the gain of R and G is reduced, so the situation that the picture signal of the R of brightness ratio 100% and G is output is low.Therefore, if white balance is adjusted, the brightness of display device is set as lower than the brightness of original demonstration so.
In order to adjust white balance, in gain control unit, when pixel value equal (R, G, in the time of B)=(100,100,100) display device of exportable high-high brightness be adjusted to (R, G, B)=(80,80,100).If each of rgb signal increases by 10% under the state of white peak, (B)=(88,88,100), and the pixel value of B be maximum, makes brightness not to be increased for R, G.Therefore, white balance departs from setting value.
When white peak exists, be difficult to aware color drift (colordrift) in less zone.But, if if exist the side-play amount of a plurality of white peaks or white balance bigger, so also problematic situation can take place.
Therefore, by by the side-play amount of color diffusion unit 405 to neighboring pixel diffusion white balance, the white balance of a plurality of pixel regions is by equalization.In the above-described embodiments, because each of R and G pixel value departs from 8, therefore deduct 2 values that obtain and be shown, owing to make the white balance equalization of a plurality of pixel regions basically by each of four pixels from upper and lower, left and right.
As a result, can provide brightness ratio by the high white peak of the brightness of white balance restriction and the display device of high image quality more.
(second embodiment)
In embodiment 1, illustrated and detected white portion and carry out the example that white peak is handled.About the peak processing that can carry out predetermined particular color and the method that obtains picture rich in detail second embodiment is described now.
In many projection display devices, generally pay attention to the light service efficiency and use high-pressure mercury-vapor lamp as light source.But high-pressure mercury-vapor lamp has the lower tendency of brightness that causes red area owing to the spectral characteristic of lamp.
Therefore, so far, for example, by widen be used for red sub from the cutoff wavelength (cutting wavelength) of wave filter of dichroic (dichloic) mirror 14 increase the amount of transmitted light.But, though red brightness increase, the purity deterioration of red colourity, and colour gamut (color gamut) narrows down.
According to the present invention, the size by detecting red area is also carried out the peak treatment for correcting according to this size, even also can the clear display image in red area, red colour gamut is narrowed down.
Illustrate that with reference to Fig. 3 and Fig. 4 the peak for redness among the embodiment handles again now.The difference of itself and first embodiment is that peak correcting unit 103, peak detecting unit 401 and peak are proofreaied and correct 402 pairs of redness as predetermined color of control module and carried out the peak treatment for correcting.
Peak detecting unit 401 detects R, the G of incoming video signal and the ratio of B signal, and whether decision signal is red thus.In the present embodiment, each of R and B signal signal of 5% of being equal to or less than the R signal is confirmed as redness.Then, judge that whether the signal of determining being carried out the peak handles.For this reason, calculate the quantity of continuous peak processing target pixel, and handle according to count value control peak.
In the present embodiment, carrying out the peak when the counting Kr of the peak of redness object pixel is equal to or less than 20 handles.Red brightness increases by 10% when supposing Kr=1, and at K
rBe set as 1 times value at=21 o'clock,
Rout＝{1+f(Kr)}·Rin
Gout＝Gin
Bout＝Bin
Here,
f(Kr)＝(20-(Kr-1))/200
1+f (Kr) represents gain.
According to second embodiment, with the similar mode setting device of first embodiment, make when the counting Kr of red peak object pixel is equal to or less than 20 the linear change of the recruitment at red peak.But the video scenery that maybe will show by the characteristic according to display device changes the function f (Kr) in the equation, can carry out the red peak of the most suitable display device or video scenery and proofread and correct.
And in the present embodiment, determining method and white balance adjustment method for the size of red area can use and the first embodiment similar methods.
For example, pixel value equals that (picture signal B)=(80,0,0) is confirmed as red peak correction target image for R, G.Suppose that the R signal increases by 10%, (R, G, B)=(88,0,0) and white balance control module 404 be adjusted with output because white balance surpasses the R signal of limits value.
Be adjusted at pixel value that feasible (R, G B)=(100,80,80) are set under the peaked situation by white balance, if (R, G B)=(100,0,0) are transfused to the R signal, and so, because the value of R is a maximal value, so the brightness of R can not be increased.Like this, when the R signal has maximal value, by increasing G or B signal and for example passing through as (each 5% execution that B)=(100,5,5) increases G and B signal like that increases the peak treatment for correcting of red brightness for R, G.
Carry out this processing by a kind of like this sense quality of utilizing the people, that is,, thereby be difficult to perceive color drift in less zone owing to red peak exists.
As a result, can be equal to or higher than the red peak of the brightness that limits by white balance by apparent brightness, and the display device of the picture rich in detail of high image quality can be provided.
As mentioned above, in the present invention,, can also proofread and correct the deficiency of contrast sense of the redness that the deficiency by the brightness of redness as the problems referred to above causes and the deficiency of brightness impression by change the view data of red area according to the size of red area.And, the display device of the picture rich in detail that can show high image quality can be provided.
Though illustrated in the present embodiment redness is carried out the example that the peak is handled, obviously, the present invention also can be used to other color.
Claims (7)
1. an image display device is used for based on the view data display image, and this image display device comprises:
Be used for detecting the pick-up unit of size of the color region of predetermined color based on described view data;
Be used for conversion equipment according to the view data of the described color region of size conversion of described color region,
Wherein, the described pick-up unit that is used to detect the size of described color region is to be used to calculate the counting assembly of quantity that continuous described view data is the pixel of white peak.
2. according to the image display device of claim 1, wherein, the described conversion equipment that is used to change described view data is the control device that is used to control gray scale.
3. according to the image display device of claim 1, also comprise the white balance control device that is used for changing white balance according to the size of white portion.
4. according to the image display device of claim 3, also comprise the color disperser that is used for color being diffused into neighboring pixel according to the variation of described white balance.
5. according to the image display device of claim 4, wherein, described color disperser changes variable quantity according to the pixel value of the variation of described white balance with the pixel value of neighboring pixel.
6. image display device comprises:
Display device; With
Signal processing circuit is used for received image signal and view data is outputed to described display device,
Wherein,
The first area of specifying first picture signal of first image to have predetermined color and predetermined luminance, first area have along first width of predetermined direction,
The second area of specifying second picture signal of second image to have described predetermined color and described predetermined luminance, described second image equals the image of the mean flow rate of described first image for the mean flow rate of its entire image, second area has along described predetermined direction second width bigger than first width, and
Wherein by conversion first picture signal, described signal processing circuit generates view data, makes the brightness data of the picture signal of winning bigger than the brightness data of second picture signal.
7. according to the image display device of claim 6, also comprise the change-over circuit that is used for based on the controlling value conversion image data, described controlling value is based on the quantity along the pixel of the continuous described predetermined color of described predetermined direction.
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| JP2005007481 | 2005-01-14 | ||
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| JP2005372527 | 2005-12-26 |
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Citations (4)
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| CN1313982A (en) * | 1999-06-07 | 2001-09-19 | 精工爱普生株式会社 | Image displaying apparatus and method, and image processing device and method |
| CN1457024A (en) * | 2002-05-10 | 2003-11-19 | 佳能株式会社 | Greyscale transform process |
| JP2004201106A (en) * | 2002-12-19 | 2004-07-15 | Sony Corp | Imaging apparatus, color adjustment device, and color adjustment method |
| JP2004228948A (en) * | 2003-01-23 | 2004-08-12 | Seiko Epson Corp | Image processing system, projector, program, information storage medium and image processing method |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1313982A (en) * | 1999-06-07 | 2001-09-19 | 精工爱普生株式会社 | Image displaying apparatus and method, and image processing device and method |
| CN1457024A (en) * | 2002-05-10 | 2003-11-19 | 佳能株式会社 | Greyscale transform process |
| JP2004201106A (en) * | 2002-12-19 | 2004-07-15 | Sony Corp | Imaging apparatus, color adjustment device, and color adjustment method |
| JP2004228948A (en) * | 2003-01-23 | 2004-08-12 | Seiko Epson Corp | Image processing system, projector, program, information storage medium and image processing method |
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