WO2011080963A1 - 表示装置 - Google Patents
表示装置 Download PDFInfo
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- WO2011080963A1 WO2011080963A1 PCT/JP2010/069506 JP2010069506W WO2011080963A1 WO 2011080963 A1 WO2011080963 A1 WO 2011080963A1 JP 2010069506 W JP2010069506 W JP 2010069506W WO 2011080963 A1 WO2011080963 A1 WO 2011080963A1
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- gamma conversion
- video signal
- gradation
- liquid crystal
- input
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0238—Improving the black level
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0252—Improving the response speed
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0285—Improving the quality of display appearance using tables for spatial correction of display data
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/041—Temperature compensation
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/10—Special adaptations of display systems for operation with variable images
- G09G2320/103—Detection of image changes, e.g. determination of an index representative of the image change
Definitions
- the present invention relates to a display device, and more particularly, to a display device that displays an image by performing processing according to temperature and processing according to the type of video signal on a video signal.
- the response speed of the liquid crystal in the liquid crystal display device varies depending on the gradation change (how the gradation changes). For example, it is known that a liquid crystal in a vertical alignment mode (normally black mode) has the slowest response speed when the gradation changes from black to halftone. Further, the response speed of the liquid crystal becomes slower as the temperature becomes lower. For example, an in-vehicle liquid crystal display device needs to operate even when the environmental temperature is about ⁇ 20 ° C. However, at low temperatures, the response speed of the liquid crystal is extremely slow when the gradation changes from black or a gradation close to black to halftone. Also, when the image is a moving image, the response speed of the liquid crystal when the gradation changes from black or a gradation close to black to a halftone becomes extremely slow.
- an object of the present invention is to provide a display device that can improve response speed at low cost.
- a first aspect of the present invention is a display device that displays an image by performing gamma conversion on an input video signal, A display panel; A digital gamma converter for performing gamma conversion on the input video signal; A drive unit for driving the display panel based on the video signal after the gamma conversion; A timing control unit that outputs the video signal and the control signal at a predetermined timing to the drive unit; A first table used when performing gamma conversion in the digital gamma conversion unit; A determination unit that determines whether or not a predetermined condition is satisfied, The first table stores a gamma conversion result for converting the input video signal so that the luminance corresponding to the input gradation on the low gradation side of the input video signal is multiplied by a predetermined magnification. And The digital gamma conversion unit may perform gamma conversion using the first table when it is determined that the predetermined condition is satisfied.
- a temperature detector for detecting the temperature of the display panel;
- a changeover switch for switching to output the input video signal to either the digital gamma conversion unit or the timing control unit;
- the determination unit determines whether the temperature detected by the temperature detection unit is higher than a predetermined value,
- the changeover switch is switched to output the input video signal to the digital gamma conversion unit when the detected temperature is determined to be equal to or less than the predetermined value, and when determined to be higher than the predetermined value,
- the input video signal is switched to be output to the timing control unit without performing gamma conversion.
- a temperature detector for detecting the temperature of the display panel;
- a second table for storing a gamma conversion result obtained by multiplying the luminance corresponding to all input gradations of the input video signal by 1;
- the determination unit is included in the digital gamma conversion unit, determines whether the temperature detected by the temperature detection unit is higher than a predetermined value, The digital gamma conversion unit performs gamma conversion using the first table when it is determined that the detected temperature is equal to or lower than the predetermined value, and the detected temperature is higher than the predetermined value. When it is determined, gamma conversion is performed using the second table.
- the first table includes a plurality of tables storing different gamma conversion results depending on the temperature, Among the plurality of tables, the table used at a lower temperature stores the gamma conversion result obtained by increasing the predetermined magnification, The digital gamma conversion unit selects one table from the plurality of tables according to the temperature detected by the temperature detection unit, and performs gamma conversion using the selected table.
- a temperature detector for detecting the temperature of the display panel;
- a third table for storing a gamma conversion result for converting the input gradation of the input video signal into a desired output gradation;
- the input gradation is set to a desired output gradation, and then the luminance corresponding to the input gradation on the low gradation side is multiplied by the predetermined magnification. It is a table that stores the gamma conversion result that converts the input video signal.
- the determination unit is included in the digital gamma conversion unit, determines whether the temperature detected by the temperature detection unit is higher than a predetermined value, The digital gamma conversion unit performs gamma conversion using the first table when it is determined that the detected temperature is equal to or lower than the predetermined value, and the detected temperature is higher than the predetermined value. If it is determined, gamma conversion is performed using the third table.
- the determination unit determines the type of the input video signal
- the changeover switch switches the input video signal to be output to the digital gamma converter when it is determined that the input video signal is a moving image, and performs gamma conversion when it is determined that the input video signal is a still image. And switching to output the input video signal to the timing control unit.
- the determination unit is included in the digital gamma conversion unit, determines the type of the input video signal,
- the digital gamma conversion unit performs gamma conversion using the first table when it is determined that the input video signal is a moving image, and when it is determined that the input video signal is a still image, Gamma conversion is performed using the second table.
- a third table for storing a gamma conversion result for converting the input gradation of the input video signal into a desired output gradation In the first table, the input gradation is set to a desired output gradation, and then the luminance corresponding to the input gradation on the low gradation side is multiplied by the predetermined magnification. It is a table that stores the gamma conversion result that converts the input video signal.
- the determination unit is included in the digital gamma conversion unit, determines the type of the input video signal, The digital gamma conversion unit performs gamma conversion using the first table when it is determined that the input video signal is a moving image, and when it is determined that the input video signal is a still image, Gamma conversion is performed using the third table.
- the predetermined magnification is greater than 1 and 2 or less.
- the digital gamma conversion unit converts the input video signal into a multi-gradation video signal
- the image processing apparatus further includes a pseudo multi-gradation unit that performs pseudo multi-gradation processing on the video signal output from the digital gamma conversion unit and outputs the obtained video signal to the timing control unit.
- the display panel is a normally black mode liquid crystal panel.
- the gamma conversion when a predetermined condition is satisfied, the gamma conversion is such that the luminance obtained by multiplying the luminance corresponding to the input gradation on the low gradation side by the predetermined magnification is obtained.
- the first table for storing the results gamma conversion is performed on the input video signal.
- the input video signal is output to the digital gamma conversion unit by switching the changeover switch to the digital gamma conversion unit side.
- the digital gamma conversion unit performs gamma conversion on the input video signal using the first table.
- the changeover switch is switched to the timing control unit and the input video signal is output to the timing control unit as it is.
- the display device stores not only the first table, but also the second gamma conversion result obtained by multiplying the luminance corresponding to all input gradations by one.
- the table is also equipped.
- the digital gamma conversion unit performs gamma conversion on the input video signal using the first table.
- the temperature of the display panel is higher than the predetermined value, the gradation change with a slow response speed does not occur, so the digital gamma conversion unit performs gamma conversion on the input video signal using the second table. .
- the digital gamma conversion unit selects an optimum table from a plurality of tables and uses the selected table to input video signals. Perform gamma conversion on.
- gamma conversion can be performed using an optimum table selected from a plurality of tables according to the temperature of the display panel, so that a gradation change with a slow response speed occurs regardless of the temperature of the display panel. This can be further prevented, and the response speed can be improved at low cost without overshoot driving.
- the digital gamma conversion unit when the temperature of the display panel is equal to or lower than a predetermined value, performs gamma conversion using the first table. That is, after the input gradation of the input video signal is converted into a desired output gradation, conversion is further performed to increase the luminance on the lower gradation side by a predetermined magnification. On the other hand, when the temperature of the display panel is higher than a predetermined value, the digital gamma conversion unit performs gamma conversion using the third table.
- the input video signal when the input video signal is a moving image, the input video signal is output to the digital gamma conversion unit by switching the changeover switch to the digital gamma conversion unit side.
- the digital gamma conversion unit performs gamma conversion on the input video signal using the first table.
- the selector switch is switched to the timing control unit, and the input video signal is output to the timing control unit without performing gamma conversion.
- the only table that needs to be prepared is the first table, the manufacturing cost of the display device can be reduced.
- the display device stores not only the first table but also the second gamma conversion result obtained by multiplying the luminance corresponding to all input gradations by 1 as the multiplication factor.
- the table is also equipped.
- the digital gamma conversion unit performs gamma conversion on the input video signal using the first table.
- the digital gamma conversion unit performs gamma conversion on the input video signal using the second table.
- the digital gamma conversion unit when the input video signal is a moving image, performs gamma conversion using the first table. That is, after the input gradation of the input video signal is converted into a desired output gradation, conversion is further performed to increase the luminance on the lower gradation side by a predetermined magnification.
- the digital gamma conversion unit when the input video signal is a still image, performs gamma conversion using the third table.
- the response speed can be improved at low cost without performing overshoot driving. Furthermore, even when the gamma value is changed to display an image with a desired output gradation, it is possible to prevent a gradation change with a slow response speed from occurring regardless of the type of input video signal.
- the setting range can be expanded.
- the ninth aspect of the present invention it is possible to prevent the input video signal on the high gradation side from being saturated by the gamma conversion, causing the contrast balance to be lost and causing image corruption.
- the number of gradations of the video signal is increased by gamma conversion, and then a pseudo multi-gradation process is performed, thereby performing multi-gradation display exceeding the capability of the drive unit. it can.
- the response speed of the liquid crystal can be improved at a low cost in the display device including the normally black mode liquid crystal panel.
- FIG. 1 is a block diagram illustrating a configuration of a liquid crystal display device according to a first embodiment of the present invention. It is a figure which shows the example of the process result of the pseudo
- FIG. 1 is a block diagram showing a configuration of a liquid crystal display device 10 according to the first embodiment of the present invention.
- a liquid crystal display device 10 shown in FIG. 1 includes a display control circuit 11, a look-up table (hereinafter referred to as "LUT") 12, a scanning line driving circuit 13, a data line driving circuit 14, a liquid crystal panel 15, and A temperature sensor 16 is provided.
- the display control circuit 11 includes an input unit 21, a digital gamma conversion unit 22, a pseudo multi-gradation unit 23, and a timing control unit 24.
- the input unit 21 includes a temperature determination unit 31 and a changeover switch 32. It is out.
- the liquid crystal display device 10 does not include an overshoot driving circuit.
- the liquid crystal panel 15 includes a plurality of scanning lines 1, a plurality of data lines 2, and a plurality of pixels 3.
- the scanning lines 1 are arranged in parallel to each other, and the data lines 2 are arranged in parallel to each other so as to be orthogonal to the scanning lines 1.
- the pixel 3 is arranged corresponding to the intersection of the scanning line 1 and the data line 2 and is connected to one scanning line 1 and one data line 2.
- the liquid crystal panel 15 is a normally black mode (vertical alignment mode) liquid crystal panel such as a multi-domain vertical alignment (MVA) system.
- VMA multi-domain vertical alignment
- the scanning line driving circuit 13 and the data line driving circuit 14 constitute a driving unit that drives the liquid crystal panel 15.
- the scanning line driving circuit 13 sequentially selects the scanning lines 1 one by one from the plurality of scanning lines 1 and applies a predetermined voltage (for example, a high level voltage) to the selected scanning lines 1.
- the pixels 3 connected to the scanning line 1 to which a predetermined voltage is applied are sequentially selected for each scanning line 1.
- the data line driving circuit 14 applies a voltage corresponding to the video signal V1 or the video signal V3 output from the display control circuit 11 to each data line 2.
- the voltage applied to each data line 2 is written to each of the selected pixels 3.
- the luminance of the pixel 3 changes according to the voltage written in the pixel 3.
- a desired image can be displayed on the liquid crystal panel 15 by writing a voltage corresponding to the video signal to all the pixels 3 in the liquid crystal panel 15. At this time, the higher the voltage applied to the liquid crystal, the faster the response speed of the liquid crystal and the shorter the switching time of the image displayed on the liquid crystal panel 15.
- the video signal V1 is input to the input unit 21 of the liquid crystal display device 10 from the outside.
- the input video signal (input video signal) V ⁇ b> 1 is given to the changeover switch 32 of the input unit 21.
- the temperature sensor 16 is provided on the surface of the liquid crystal panel 15 and detects the surface temperature of the liquid crystal panel 15.
- the temperature detected by the temperature sensor 16 (hereinafter referred to as “panel temperature Tp”) is input to the temperature determination unit 31.
- the temperature determination unit 31 determines whether the panel temperature Tp is higher than a predetermined temperature ( ⁇ 10 ° C. in this embodiment), and switches the changeover switch 32 according to the determination result.
- the changeover switch 32 is switched to the digital gamma converter 22 side.
- the changeover switch 32 is switched by the video signal V 1, and the video signal V 1 is input to the digital gamma conversion unit 22.
- the changeover switch 32 is switched to the timing control unit 24 side. Accordingly, the video signal V1 is input to the timing control unit 24 and is not input to the digital gamma conversion unit 22 and the pseudo multi-gradation unit 23. For this reason, the video signal V1 is not subjected to gamma conversion and pseudo multi-gradation processing.
- the digital gamma conversion unit 22 When the panel temperature Tp is ⁇ 10 ° C. or lower, the digital gamma conversion unit 22 performs gamma conversion using the LUT 12 on the video signal V1, and outputs a video signal V2 having a higher gradation than the video signal V1.
- the pseudo multi-gradation unit 23 performs pseudo multi-gradation processing on the video signal V2, and outputs a video signal V3 having the same number of gradations as the video signal V1.
- the timing control unit 24 outputs a control signal C1 to the scanning line driving circuit 13 and outputs a control signal C2 to the data line driving circuit 14.
- the control signal C1 includes a gate start pulse and a gate clock
- the control signal C2 includes a source start pulse and a source clock.
- the timing control unit 24 outputs a video signal to the data line driving circuit 14 at a suitable timing. Specifically, if the panel temperature Tp is ⁇ 10 ° C. or lower, the video signal V3 is output, and if it is higher than ⁇ 10 ° C., the video signal V1 is output.
- the video signals V1 and V3 are 6-bit video signals
- the video signal V2 is an 8-bit video signal.
- the digital gamma conversion unit 22 generates an 8-bit video signal V2 based on the 6-bit video signal V1
- the pseudo multi-gradation unit 23 generates 8-bit.
- a 6-bit video signal V3 is generated based on the video signal V2.
- the predetermined temperature is set to ⁇ 10 ° C., according to an experiment conducted by the inventor, when the temperature is ⁇ 10 ° C. or lower, the response speed of the liquid crystal becomes extremely slow, and the display is performed on the liquid crystal panel 15. This is because the blurred image is noticeable, and the predetermined temperature is appropriately determined according to the liquid crystal panel to be used.
- the pseudo multi-gradation unit 23 performs the following frame rate control, for example. That is, the pseudo multi-gradation unit 23 divides the video signal V2 into upper 6 bits and lower 2 bits, and outputs the upper 6 bits or a value obtained by adding 1 to the upper 6 bits as the video signal V3. Which is output is determined by the value of the lower 2 bits.
- N is an integer between 0 and 3
- the upper 6 bits are output in the (4-N) frames out of the 4 consecutive frames, and the higher 6 bits are output in the remaining N frames. A value obtained by adding 1 is output.
- the method of selecting N frames from four consecutive frames differs between four adjacent pixels.
- FIG. 2 is a diagram illustrating an example of a processing result of the pseudo multi-gradation unit 23.
- the value of the video signal V2 is 10001101 (binary representation)
- the values of the video signal V3 for four frames are described for four adjacent pixels.
- the value of the upper 6 bits of the video signal V2 is 100011 (binary representation)
- the value of the lower 2 bits of the video signal V2 is 1. Therefore, the value of the video signal V3 is 1000011 (binary representation) for 3 frames out of 4 consecutive frames, and 100100 (binary representation) for the remaining 1 frame.
- the value of the video signal V3 is 100100 (binary representation) because the upper right pixel is the first frame, the lower right pixel is the second frame, the lower left pixel is the third frame, and the upper left pixel is the fourth frame. Eyes.
- the luminance of the pixel 3 may be at a level corresponding to the value of the upper 6 bits of the video signal V2 or at a level one level higher than that. Therefore, the luminance of the pixel 3 is averaged in time and becomes a level between the two. Further, by arranging the pixels 3 two-dimensionally, the luminance of the pixels 3 is averaged in the spatial direction.
- 8-bit gradation display 256-level gradation display
- the pseudo multi-gradation unit 23 may perform the pseudo multi-gradation process on the video signal V2 by a method (for example, error diffusion method) other than the frame rate control.
- FIG. 3 is a diagram illustrating processing of the digital gamma conversion unit 22.
- the video signal V1 input to the digital gamma conversion unit 22 includes a 6-bit red component V1r, a 6-bit green component V1g, and a 6-bit blue component V1b.
- the LUT 12 includes an R LUT used for gamma conversion of the red component V1r, a G LUT used for gamma conversion of the green component V1g, and a B LUT used for gamma conversion of the blue component V1b. .
- the digital gamma conversion unit 22 converts the 6-bit red component V1r into the 8-bit red component V2r using the R LUT, and converts the 6-bit green component V1g into the 8-bit green component V2g using the G LUT. And the process of converting the 6-bit blue component V1b into the 8-bit blue component V2b using the B LUT are independently performed. In this way, the digital gamma conversion unit 22 independently performs gamma conversion of the red component V1r, the green component V1g, and the blue component V1b on the 6-bit video signal V1, and the 8-bit video signal V2r. , V2g, and V2b are generated. Note that the data stored in these three types of LUTs may be the same or different. If different data is stored in the three types of LUTs, different gamma conversion can be performed for each color.
- the LUT 12 stores the value of the video signal V2 (hereinafter referred to as output gradation) in association with the value of the video signal V1 (hereinafter referred to as input gradation).
- the digital gamma conversion unit 22 reads the output gradation corresponding to the input gradation from the LUT 12, thereby converting the video signal V1 into the video signal V2, and outputs the converted video signal V2 to the pseudo multi-gradation unit 23. .
- the digital gamma conversion unit 22 converts the video signal V1 into the 8-bit video signal V2 using the LUT 12.
- the digital gamma conversion unit 22 will be described assuming that the 6-bit video signal V1 is converted into a 6-bit video signal and the converted video signal is output to the timing control unit 24.
- the liquid crystal panel 15 is a liquid crystal panel capable of displaying 64 gradations
- the input gradation is X (0 ⁇ X ⁇ 63)
- a voltage corresponding to the luminance y is applied to the liquid crystal in the pixel 3.
- the liquid crystal panel 15 is a normally black mode liquid crystal panel
- the panel temperature Tp is ⁇ 10 ° C. or lower
- the response speed of the liquid crystal is extremely high when the input gradation X is a gradation on the low gradation side. Will be late. Therefore, in order to improve the response speed of the liquid crystal at ⁇ 10 ° C. or lower, it is necessary to apply a higher voltage to the liquid crystal, that is, increase the luminance of the image.
- the luminance Y obtained by the equation (1) is multiplied by k (1 ⁇ k ⁇ 2) to obtain the luminance Y.
- obtaining the luminance Y by multiplying the luminance y corresponding to the input gradation X on the low gradation side by k is referred to as “gamma conversion”.
- Y k * (X / 63) ⁇ (2)
- the luminance of the image corresponding to the input gradation X on the low gradation side is compared with the luminance of the image by the video signal not subjected to gamma conversion. It is only twice as high. Note that the luminance of an image is determined by the transmittance and the luminance of a backlight (not shown). However, if the luminance of the backlight is ignored, the luminance of the image becomes equal to the transmittance of the liquid crystal panel 15. The transmittance of the liquid crystal panel 15 is equal to the voltage applied to the liquid crystal, that is, the output gradation. As a result, the luminance Y of the image represented by Expression (2) becomes equal to the output gradation.
- the LUT 12 stores the output gradation associated with the input gradation X based on the equation (2).
- the operator adjusts the output gradation so that the video signal V2 does not saturate and the gamma characteristic changes smoothly.
- the key is added to the LUT 12 and stored.
- the LUT 12 that stores the gamma conversion result suitable for the gamma characteristic of the liquid crystal panel 15 at ⁇ 10 ° C. or less is obtained.
- the input gradation X of the video signal V1 has many gradations on the low gradation side. For this reason, if Expression (2) is applied to the input gradation X on the low gradation side, the image displayed on the liquid crystal panel 15 is switched in a short time. In this case, it is possible to suppress the blur that is likely to occur when the images are switched.
- FIG. 4 is a diagram showing the relationship between the input gradation X and the transmittance of the liquid crystal panel 15 when gamma conversion is performed using the LUT 12 thus obtained.
- FIG. 5 is a table showing the response speed of the conventional liquid crystal display device at ⁇ 20 ° C.
- FIG. 6 is a table showing the response speed of the liquid crystal display device 10 according to the present embodiment at ⁇ 20 ° C. 5 and 6, the start gradation represents the gradation of the image displayed immediately before, and the arrival gradation represents the gradation of the currently displayed image.
- the start gradation represents the gradation of the image displayed immediately before
- the arrival gradation represents the gradation of the currently displayed image.
- the response speed was extremely slow when the gradation changed from black or a gradation close to black to a halftone at a low temperature.
- the liquid crystal display device 10 performs gamma conversion so that the luminance corresponding to the gradation on the low gradation side of the luminance of the liquid crystal panel 15 when the image based on the video signal V1 is displayed is multiplied by k. .
- the response time of the liquid crystal becomes shorter than the response time of the conventional liquid crystal display device in almost all gradations, and the response speed of the liquid crystal is improved. This prevents a change in gradation with a slow response speed of the liquid crystal (specifically, a change from black or a gradation close to black to an intermediate gradation) and reduces the response speed of the liquid crystal at low temperatures. Can be improved.
- the column indicating the gamma conversion whose response time is shortened is hatched.
- the response time of the liquid crystal can be greatly shortened.
- the maximum response time of the conventional liquid crystal display device at ⁇ 20 ° C. is 530 msec.
- the maximum response time can be shortened to 500 msec, and the response time for almost all input gradations X can be set to 200 msec or less.
- the liquid crystal display device 10 has the liquid crystal panel 15 and the input video signal V1 to the digital gamma conversion unit 22 when the panel temperature Tp is ⁇ 10 ° C. or lower.
- the scanning line driving circuit 13 and the data line driving circuit 14 to be driven, the temperature sensor 16 for detecting the temperature of the liquid crystal panel 15, and the luminance of the image by the video signal V1 correspond to the input gradation X on the low gradation side.
- an LUT 12 for storing a gamma conversion result for obtaining a video signal V2 for multiplying the luminance by k. If the panel temperature Tp detected by the temperature sensor 16 is ⁇ 10 ° C. or lower, the digital gamma conversion unit 22 performs gamma conversion on the video signal V1 using the LUT 12. Thereby, the liquid crystal display device 10 prevents a change in gradation with a slow response speed regardless of the temperature of the liquid crystal panel 15, and improves the response speed at low cost without performing overshoot drive. be able to. Further, when the panel temperature Tp is higher than ⁇ 10 ° C., the gamma conversion is not performed, so that an LUT for that purpose is unnecessary. For this reason, the only LUT that must be prepared is the LUT 12, and the manufacturing cost of the liquid crystal display device 10 can be reduced.
- k used for performing gamma conversion stored in the LUT 12 is a numerical value in a range of 1 ⁇ k ⁇ 2.
- the digital gamma conversion unit 22 converts the video signal V1 into a multi-gradation video signal V2.
- the liquid crystal display device 10 further includes a pseudo multi-gradation unit 23 that performs pseudo multi-gradation processing on the video signal V2 and outputs the obtained video signal V3 to the timing control unit 24. In this way, by increasing the number of gradations of the video signal V2 by gamma conversion and then performing pseudo multi-gradation processing, multi-gradation display exceeding the capability of the drive unit can be performed.
- FIG. 7 is a block diagram showing a configuration of a liquid crystal display device 100 according to a first modification of the first embodiment of the present invention.
- a liquid crystal display device 100 shown in FIG. 7 includes a display control circuit 11, a plurality of (three in this modification) LUTs 112a to 112c, a scanning line driving circuit 13, a data line driving circuit 14, a liquid crystal panel 15, and a temperature sensor 16. It has.
- the display control circuit 11 includes an input unit 21, a digital gamma conversion unit 22, a pseudo multi-gradation unit 23, and a timing control unit 24.
- the input unit 21 includes a temperature determination unit 31 and a changeover switch 32. It is out.
- the same components as those of the liquid crystal display device 10 according to the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- the liquid crystal display device 100 differs from the liquid crystal display device 10 shown in FIG. 1 in that a gamma conversion result obtained based on k having a different value according to the panel temperature Tp is used instead of the LUT 12.
- Three LUTs 112a to 112c for storing each are provided.
- the digital gamma conversion unit 22 determines whether the panel temperature Tp detected by the temperature sensor 16 is 3 One LUT is selected from the LUTs 112a to 112c, and using the selected LUT, gamma conversion is performed on the input video signal V1, and a video signal V2 having a higher gradation than the video signal V1 is obtained. The result is output to the pseudo multi-gradation unit 23.
- the three LUTs 112a to 112c have different k values in equation (2) used when performing gamma conversion based on the input gradation X on the low gradation side, and are used when the panel temperature Tp is lower. Larger values of k are used for more LUTs.
- the digital gamma conversion unit 22 responds to the panel temperature Tp detected by the temperature sensor 16 from the three LUTs 112a to 112c when the panel temperature Tp is ⁇ 10 ° C. or lower.
- One LUT is selected, and gamma conversion is performed using the selected LUT. That is, it is more preferable because an optimum LUT corresponding to the temperature of the liquid crystal panel 15 can be selected from a plurality of LUTs for the input video signal V1, and gamma conversion can be performed using the selected LUT. Gamma conversion can be performed.
- the liquid crystal display device 100 can further prevent a change in gradation with a slow response speed from occurring regardless of the temperature of the liquid crystal panel 15, and can respond at a low cost without performing overshoot driving. The speed can be further improved.
- FIG. 8 is a block diagram showing a configuration of a liquid crystal display device 200 according to a second modification of the first embodiment of the present invention.
- the liquid crystal display device 200 illustrated in FIG. 8 includes a display control circuit 211, two LUTs 212 a and 212 b, a scanning line driving circuit 13, a data line driving circuit 14, a liquid crystal panel 15, and a temperature sensor 16.
- the display control circuit 211 includes a digital gamma conversion unit 222, a pseudo multi-gradation unit 23, and a timing control unit 24, and the digital gamma conversion unit 222 includes a temperature determination unit 231.
- the same components as those of the liquid crystal display device 10 according to the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.
- the panel temperature Tp of the liquid crystal panel 15 detected by the temperature sensor 16 is provided in the digital gamma conversion unit 222.
- the temperature is input to the temperature determination unit 231.
- the temperature determination unit 231 determines whether or not the panel temperature Tp is higher than a predetermined temperature ( ⁇ 10 ° C. in this modification).
- the digital gamma conversion unit 222 selects one LUT from the LUTs 212a and 212b according to the determination result of the temperature determination unit 231.
- the digital gamma converter 222 selects the LUT 212a when the panel temperature Tp is ⁇ 10 ° C. or lower, selects the LUT 212b when the panel temperature Tp is higher than ⁇ 10 ° C., and performs gamma conversion.
- V2 is output to the pseudo multi-gradation unit 23. Note that the processing after the pseudo multi-gradation processing in the pseudo multi-gradation unit 23 is the same as the processing in the liquid crystal display device 10, and thus the description thereof is omitted.
- the digital gamma converter 222 performs gamma conversion on the video signal V1 using the LUT 212a when the panel temperature Tp is ⁇ 10 ° C. or lower.
- the digital gamma conversion unit 222 performs gamma conversion on the video signal V1 using the LUT 212b.
- the digital gamma conversion unit 222 performs gamma.
- the digital gamma conversion unit 222 performs gamma.
- the gamma conversion result is stored.
- the gamma conversion result for gamma-converting the video signal V1 is stored so that the conversion is performed.
- the digital gamma conversion unit 222 of the liquid crystal display device 200 performs gamma conversion using the LUT 212a when the temperature of the liquid crystal panel 15 is ⁇ 10 ° C. or lower, and uses the LUT 212b when the temperature of the liquid crystal panel 15 is higher than ⁇ 10 ° C. Perform gamma conversion. Then, the video signal V2 having a desired output gradation subjected to gamma conversion is output to the pseudo multi-gradation unit 23. As a result, the liquid crystal display device 200 can prevent a change in gradation with a slow response speed from occurring regardless of the temperature of the liquid crystal panel 15, and the response speed can be reduced at low cost without overshoot driving. Can be improved.
- the liquid crystal display device 200 causes a gradation change with a slow response speed regardless of the temperature of the liquid crystal panel 15. Therefore, the setting range of the gamma value can be expanded.
- FIG. 9 is a block diagram showing a configuration of a liquid crystal display device 300 according to a third modification of the first embodiment of the present invention.
- the liquid crystal display device 300 shown in FIG. 9 includes a display control circuit 211, a plurality (four in this case) of LUTs 312a to 312d, a scanning line driving circuit 13, a data line driving circuit 14, a liquid crystal panel 15, and a temperature sensor 16. ing.
- the display control circuit 211 includes a digital gamma conversion unit 222, a pseudo multi-gradation unit 23, and a timing control unit 24, and the digital gamma conversion unit 222 includes a temperature determination unit 231.
- the same components as those of the liquid crystal display device 200 according to the second modification are denoted by the same reference numerals and description thereof is omitted.
- the table 312a is taken.
- the table 312b is taken.
- the table 312d is used.
- the digital gamma conversion unit 222 uses the LUT 312d to perform gamma on the video signal V1. Perform conversion.
- the digital gamma conversion unit 222 selects one LUT from the LUTs 312a to 312c according to the panel temperature Tp, and uses the selected LUT to generate the video signal V1.
- gamma conversion is performed. As described above, when gamma conversion is performed, if the panel temperature Tp is higher than ⁇ 10 ° C., the LUT 312d is used.
- any of the LUTs 312a to 312c that differ depending on the temperature is used. Is used. Thereby, even when the temperature of the liquid crystal panel 15 is higher than ⁇ 10 ° C., it is possible to prevent a change in gradation with a slow response speed from occurring. Further, when the temperature of the liquid crystal panel 15 is ⁇ 10 ° C. or lower, the liquid crystal display device 300 selects an optimum LUT from the plurality of LUTs 312a to 312c according to the temperature, and performs gamma conversion using the selected LUT. Therefore, more preferable gamma conversion can be performed. For this reason, the response speed can be further improved at low cost without performing overshoot driving.
- the images include an image centered on a still image such as a menu screen (hereinafter referred to as “still image”) and an image centered on a moving image such as a television or a DVD (hereinafter referred to as “moving image”).
- a moving image is more susceptible to the response speed of the liquid crystal than a still image, and the display performance of the moving image tends to deteriorate. Therefore, if the video signal input to the liquid crystal display device is a moving image or a still image, and if it is determined to be a moving image, the display quality of the image can be improved if the response speed of the liquid crystal can be improved. Can be improved.
- FIG. 10 is a block diagram showing a configuration of a liquid crystal display device 400 according to the second embodiment of the present invention.
- a liquid crystal display device 400 shown in FIG. 10 includes a display control circuit 411, one LUT 412, a scanning line driving circuit 13, a data line driving circuit 14, and a liquid crystal panel 15.
- the display control circuit 411 includes an input unit 421, a digital gamma conversion unit 422, a pseudo multi-gradation unit 23, and a timing control unit 24.
- the input unit 421 includes an input signal determination unit 435 and a changeover switch 436. It is out.
- the same components as those of the liquid crystal display device 10 according to the first embodiment are denoted by the same reference numerals and description thereof is omitted.
- the video signal V1 is input from the outside to the input unit 421 of the liquid crystal display device 400.
- the input video signal V1 is given to the input signal determination unit 435 and the changeover switch 436 of the input unit 421.
- the input signal determination unit 435 determines whether the video signal V1 is a still image or a moving image, and when determining that the video signal V1 is a still image, switches the changeover switch 436 to the timing control unit 24 side. Thereby, the video signal V ⁇ b> 1 determined as a still image is output to the timing control unit 24.
- the input signal determination unit 435 determines that the video signal V1 is a moving image
- the input signal determination unit 435 switches the changeover switch 436 to the digital gamma conversion unit 422 side.
- the video signal V ⁇ b> 1 determined as a moving image is output to the digital gamma conversion unit 422.
- the digital gamma conversion unit 422 performs gamma conversion on the video signal V 1 using the LUT 412, and sends it to the pseudo multi-gradation unit 23.
- a video signal V2 having more gradation than the video signal V1 is output.
- the pseudo multi-gradation unit 23 performs pseudo multi-gradation processing on the video signal V2, and outputs a video signal V3 having the same number of gradations as the video signal V1 to the timing control unit 24.
- the timing control unit 24 outputs a control signal C1 to the scanning line driving circuit 13, outputs a control signal C2 to the data line driving circuit 14, and outputs video at a suitable timing to the data line driving circuit 14. Output a signal. Specifically, if the video signal V1 input to the liquid crystal display device 400 is a moving image, the video signal V3 is output, and if the video signal V1 is a still image, the video signal V1 is output.
- the processing after the pseudo multi-gradation processing in the pseudo multi-gradation unit 23 is the same as the processing in the liquid crystal display device 10 shown in FIG.
- the liquid crystal display device 400 includes the liquid crystal panel 15 and the input unit 421 that determines the type of the input video signal V1 and distributes the video signal based on the determination result.
- a digital gamma conversion unit 422 that performs gamma conversion on the video signal V1 of the moving image, and a scanning line that drives the liquid crystal panel 15 based on the video signal V3 obtained by performing pseudo multi-gradation processing on the video signal V2 after the gamma conversion
- the driving circuit 13 and the data line driving circuit 14 and an LUT 412 for storing a gamma conversion result used when the video signal V1 is a moving image are provided.
- the LUT 412 stores a gamma conversion result for obtaining a video signal V2 that multiplies the luminance corresponding to the input gradation X on the low gradation side among the luminances of the image by the video signal V1. If gamma conversion is performed on the video signal V1 using the LUT 412, the output gradation corresponding to the input gradation X on the low gradation side is multiplied by k and becomes high. Thereby, when the video signal V1 of the moving image is input, the response speed of the liquid crystal can be improved, so that the moving image can be displayed on the liquid crystal panel 15 as a high-quality image. As described above, the liquid crystal display device 400 prevents a change in gradation with a slow response speed from occurring even when the input video signal V1 is a moving image, and responds at a low cost without performing overshoot driving. Speed can be improved.
- FIG. 11 is a block diagram showing a configuration of a liquid crystal display device 500 according to a modification of the second embodiment of the present invention.
- a liquid crystal display device 500 illustrated in FIG. 11 includes a display control circuit 511, two LUTs 512a and 512b, a scanning line driving circuit 13, a data line driving circuit 14, and a liquid crystal panel 15.
- the display control circuit 511 includes a digital gamma conversion unit 522, a pseudo multi-gradation unit 23, and a timing control unit 24, and the digital gamma conversion unit 522 includes an input signal determination unit 535.
- the same components as those of the liquid crystal display device 400 according to the second embodiment are denoted by the same reference numerals, and description thereof is omitted.
- the video signal V1 is input from the outside to the digital gamma conversion unit 522 of the liquid crystal display device 500.
- the input signal determination unit 535 of the digital gamma conversion unit 522 determines whether the input video signal V1 is a moving image or a still image. When the input signal determination unit 535 determines that the video signal V1 is a moving image, the digital gamma conversion unit 522 gamma-converts the video signal V1 using the LUT 512a. On the other hand, when it is determined that the video signal V1 is a still image, the digital gamma conversion unit 522 gamma-converts the video signal V1 using the LUT 512b.
- the LUT 512a is the same table as the LUT 412.
- the digital gamma conversion unit 522 outputs to the pseudo multi-gradation unit 23 a video signal V2 having a higher gradation than the video signal V1 that is a moving image or a still image. Since the processing after the pseudo multi-gradation processing in the pseudo multi-gradation unit 23 is the same as the processing in the liquid crystal display device 400, description thereof is omitted.
- the digital gamma conversion unit 522 when the input signal determination unit 535 determines that the video signal V1 is a moving image, the digital gamma conversion unit 522 performs gamma conversion using the LUT 512a. When it is determined that the video signal V1 is a still image, gamma conversion is performed using the LUT 512b. Thereby, when the video signal V1 is a moving image, the response speed of the liquid crystal is improved, so that the moving image can be displayed on the liquid crystal panel 15 as a high-quality image. In this way, regardless of the type of the video signal V1, it is possible to prevent a change in gradation with a slow response speed from occurring, and to improve the response speed at low cost without performing overshoot driving.
- the gamma conversion result is stored.
- the gamma conversion result for gamma-converting the video signal V1 is stored so that the conversion is performed.
- the digital gamma conversion unit 522 of the liquid crystal display device 500 performs gamma conversion using the LUT 512a when the video signal V1 is a moving image, and performs gamma conversion using the LUT 512b when the video signal V1 is a still image. Then, the video signal V2 having a desired output gradation subjected to gamma conversion is output to the pseudo multi-gradation unit 23. Accordingly, the liquid crystal display device 500 prevents a change in gradation with a slow response speed from occurring even when the input video signal V1 is a moving image, and does not perform overshoot driving at a low cost. Can be improved.
- the value setting range can be expanded.
- the liquid crystal panel 15 of the liquid crystal display device according to each of the embodiments and the modifications thereof is a normally black mode (vertical alignment mode) liquid crystal panel.
- the liquid crystal panel includes not only a normally black mode but also a normally white mode liquid crystal panel such as a TN (Twisted Nematic) method. Therefore, the inventor of the present invention determines whether or not the response speed of the liquid crystal is improved when a normally white mode liquid crystal panel is used instead of the liquid crystal panel 15 in the liquid crystal display device 10 shown in FIG. The experiment was conducted.
- the liquid crystal display device used in the experiment has LUTa and LUTb.
- FIG. 12 is a diagram showing the response speed of the liquid crystal when the gamma conversion is performed using the LUTb
- FIG. 13 is a diagram showing the response speed of the liquid crystal when the gamma conversion is performed using the LUTa.
- the response speed of the liquid crystal cannot be significantly improved unlike the normally black mode liquid crystal panel.
- the response speed of the liquid crystal can be improved to some extent at low cost.
- the temperature sensor is provided at a place other than the surface of the liquid crystal panel (for example, the surface of the housing of the liquid crystal module including the liquid crystal panel), and the temperature of the liquid crystal panel has a certain relationship with the surface temperature of the liquid crystal panel. May be detected.
- the display control circuit may be integrated with at least one of the scanning line driving circuit and the data line driving circuit.
- a display device other than the liquid crystal display device can be configured by the above methods. The liquid crystal display device and the display device according to these modifications also have the same effects as the liquid crystal display devices according to the first and second embodiments.
- the response speed can be improved at low cost without performing overshoot driving.
- the present invention is suitable for a display device that reduces the delay in change in gradation even when the temperature of the liquid crystal panel is low or when an image whose moving image is included in the video signal is displayed.
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Abstract
Description
表示パネルと、
前記入力映像信号に対してガンマ変換を行なうデジタルガンマ変換部と、
ガンマ変換後の映像信号に基づき、前記表示パネルを駆動する駆動部と、
前記駆動部に所定のタイミングで前記映像信号および制御信号を出力するタイミング制御部と、
前記デジタルガンマ変換部でガンマ変換を行なうときに用いられる第1のテーブルと、
所定の条件に該当するか否かを判定する判定部とを備え、
前記第1のテーブルは、前記入力映像信号の低階調側の入力階調に対応する輝度に所定の倍率を乗算した輝度になるように前記入力映像信号を変換するガンマ変換結果を記憶するテーブルであり、
前記デジタルガンマ変換部は、前記所定の条件に該当すると判定されたときには、前記第1のテーブルを用いてガンマ変換を行なうことを特徴とする。
前記表示パネルの温度を検知する温度検知部と、
前記入力映像信号を前記デジタルガンマ変換部または前記タイミング制御部のいずれかに出力するように切り換えるための切換スイッチとをさらに備え、
前記判定部は、前記温度検知部で検知された温度が所定値よりも高いか否かを判定し、
前記切換スイッチは、前記検知された温度が前記所定値以下と判定されたときには、前記入力映像信号を前記デジタルガンマ変換部に出力するように切り換え、前記所定値よりも高いと判定されたときには、ガンマ変換を行なわずに、前記入力映像信号を前記タイミング制御部に出力するように切り換えることを特徴とする。
前記表示パネルの温度を検知する温度検知部と、
前記入力映像信号のすべての入力階調に対応する輝度に乗算する倍率を1倍として求めたガンマ変換結果を記憶する第2のテーブルとをさらに備え、
前記判定部は、前記デジタルガンマ変換部に含まれ、前記温度検知部で検知された温度が所定値よりも高いか否かを判定し、
前記デジタルガンマ変換部は、前記検知された温度が前記所定値以下であると判定されたときには、前記第1のテーブルを用いてガンマ変換を行い、前記検知された温度が前記所定値よりも高いと判定されたときには、前記第2のテーブルを用いてガンマ変換を行なうことを特徴とする。
前記第1のテーブルは、温度に応じて異なるガンマ変換結果を記憶した複数のテーブルを含み、
前記複数のテーブルのうち、より低い温度で使用されるテーブルほど、前記所定の倍率をより大きくして求めたガンマ変換結果を記憶し、
前記デジタルガンマ変換部は、前記複数のテーブルの中から前記温度検知部で検知された温度に応じて1個のテーブルを選択し、選択したテーブルを用いてガンマ変換を行なうことを特徴とする。
前記表示パネルの温度を検知する温度検知部と、
前記入力映像信号の入力階調を所望の出力階調に変換するためのガンマ変換結果を記憶する第3のテーブルとをさらに備え、
前記第1のテーブルは、入力階調を所望の出力階調になるようにした後に、低階調側の入力階調に対応する輝度に前記所定の倍率を乗算した輝度になるように、前記入力映像信号を変換するガンマ変換結果を記憶するテーブルであり、
前記判定部は、前記デジタルガンマ変換部に含まれ、前記温度検知部で検知された温度が所定値よりも高いか否かを判定し、
前記デジタルガンマ変換部は、前記検知された温度が前記所定値以下であると判定されたときには、前記第1のテーブルを用いてガンマ変換を行い、前記検知された温度が前記所定値よりも高いと判定されたときには、前記第3のテーブルを用いてガンマ変換を行なうことを特徴とする。
前記判定部の判定結果に応じて、入力映像信号を切り換えてデジタルガンマ変換部とタイミング制御部のいずれかに出力するように切り換えるための切換スイッチをさらに備え、
前記判定部は、前記入力映像信号の種類を判定し、
前記切換スイッチは、前記入力映像信号が動画であると判定されたときには、前記入力映像信号を前記デジタルガンマ変換部に出力するように切り換え、静止画であると判定されたときには、ガンマ変換を行なわずに、前記入力映像信号を前記タイミング制御部に出力するように切り換えることを特徴とする。
前記入力映像信号のすべての入力階調に対応する輝度に乗算する倍率を1倍として求めたガンマ変換結果を記憶する第2のテーブルをさらに備え、
前記判定部は、前記デジタルガンマ変換部に含まれ、前記入力映像信号の種類を判定し、
前記デジタルガンマ変換部は、前記入力映像信号が動画であると判定されたときには、前記第1のテーブルを用いてガンマ変換を行い、前記入力映像信号が静止画であると判定されたときには、前記第2のテーブルを用いてガンマ変換を行なうことを特徴とする。
前記入力映像信号の入力階調を所望の出力階調に変換するためのガンマ変換結果を記憶する第3のテーブルをさらに備え、
前記第1のテーブルは、入力階調を所望の出力階調になるようにした後に、低階調側の入力階調に対応する輝度に前記所定の倍率を乗算した輝度になるように、前記入力映像信号を変換するガンマ変換結果を記憶するテーブルであり、
前記判定部は、前記デジタルガンマ変換部に含まれ、前記入力映像信号の種類を判定し、
前記デジタルガンマ変換部は、前記入力映像信号が動画であると判定されたときには、前記第1のテーブルを用いてガンマ変換を行い、前記入力映像信号が静止画であると判定されたときには、前記第3のテーブルを用いてガンマ変換を行なうことを特徴とする。
前記所定の倍率は、1よりも大きく、かつ、2以下の倍率であることを特徴とする。
前記デジタルガンマ変換部は、前記入力映像信号をより多階調の映像信号に変換し、
前記デジタルガンマ変換部から出力された前記映像信号に対して擬似多階調化処理を施し、得られた映像信号を前記タイミング制御部に出力する擬似多階調化部をさらに備えたことを特徴とする。
前記表示パネルはノーマリブラックモードの液晶パネルであることを特徴とする。
<1.1 液晶表示装置の構成>
図1は、本発明の第1の実施形態に係る液晶表示装置10の構成を示すブロック図である。図1に示す液晶表示装置10は、表示制御回路11、ルックアップテーブル(Look Up Table :以下、「LUT」という)12、走査線駆動回路13、データ線駆動回路14、液晶パネル15、および、温度センサ16を備えている。表示制御回路11は、入力部21、デジタルガンマ変換部22、擬似多階調化部23、および、タイミング制御部24を含んでおり、入力部21は、温度判定部31および切換スイッチ32を含んでいる。なお、液晶表示装置10は、オーバーシュート駆動用の回路を備えていない。
以下の説明では、映像信号V1、V3は6ビットの映像信号であり、映像信号V2は8ビットの映像信号であるとする。この場合、パネル温度Tpが-10℃以下であれば、デジタルガンマ変換部22は6ビットの映像信号V1に基づいて8ビットの映像信号V2を生成し、擬似多階調化部23は8ビットの映像信号V2に基づいて6ビットの映像信号V3を生成する。なお、本実施形態において所定の温度を-10℃としたのは、発明者が行なった実験によれば、-10℃以下になると、液晶の応答速度が極端に遅くなり、液晶パネル15に表示される画像のぼけが顕著になったためであり、所定の温度は使用する液晶パネルに応じて適宜決められる。
y=(X/63)∧γ … (1)
Y=k*(X/63)∧γ … (2)
第1の実施形態によれば、本実施形態に係る液晶表示装置10は、液晶パネル15と、パネル温度Tpが-10℃以下のときに、入力された映像信号V1をデジタルガンマ変換部22に与える入力部21と、映像信号V1に対してガンマ変換を行なうデジタルガンマ変換部22と、ガンマ変換後の映像信号V2に擬似多階調化処理を施した映像信号V3に基づいて液晶パネル15を駆動する走査線駆動回路13およびデータ線駆動回路14と、液晶パネル15の温度を検知する温度センサ16と、映像信号V1による画像の輝度のうち、低階調側の入力階調Xに対応する輝度をそれぞれk倍するような映像信号V2を求めるガンマ変換結果を記憶するLUT12とを備えている。デジタルガンマ変換部22は、温度センサ16で検知されたパネル温度Tpが-10℃以下であれば、LUT12を用いて映像信号V1に対してガンマ変換を行なう。これにより、液晶表示装置10は、液晶パネル15の温度の温度にかかわらず応答速度が遅い階調の変化が発生することを防止し、オーバーシュート駆動を行うことなく低コストで応答速度を改善することができる。また、パネル温度Tpが-10℃よりも高いときには、ガンマ変換を行なわないので、そのためのLUTは不要になる。このため、準備しなければならないLUTはLUT12だけであり、液晶表示装置10の製造コストを低減することができる。
図7は、本発明の第1の実施形態の第1の変形例に係る液晶表示装置100の構成を示すブロック図である。図7に示す液晶表示装置100は、表示制御回路11、複数(この変形例では3個)のLUT112a~112c、走査線駆動回路13、データ線駆動回路14、液晶パネル15、および、温度センサ16を備えている。表示制御回路11は、入力部21、デジタルガンマ変換部22、擬似多階調化部23、および、タイミング制御部24を含んでおり、入力部21は、温度判定部31および切換スイッチ32を含んでいる。本変形例に係る液晶表示装置100の構成要素のうち、第1の実施形態に係る液晶表示装置10と同一の構成要素については、同一の参照符号を付してその説明を省略する。
図8は、本発明の第1の実施形態の第2の変形例に係る液晶表示装置200の構成を示すブロック図である。図8に示す液晶表示装置200は、表示制御回路211、2個のLUT212a、212b、走査線駆動回路13、データ線駆動回路14、液晶パネル15、および、温度センサ16を備えている。表示制御回路211は、デジタルガンマ変換部222、擬似多階調化部23、および、タイミング制御部24を含んでおり、デジタルガンマ変換部222は温度判定部231を含んでいる。本変形例に係る液晶表示装置200の構成要素のうち、第1の実施形態に係る液晶表示装置10と同一の構成要素については、同一の参照符号を付してその説明を省略する。
図9は、本発明の第1の実施形態の第3の変形例に係る液晶表示装置300の構成を示すブロック図である。図9に示す液晶表示装置300は、表示制御回路211、複数(ここでは4個)のLUT312a~312d、走査線駆動回路13、データ線駆動回路14、液晶パネル15、および、温度センサ16を備えている。表示制御回路211は、デジタルガンマ変換部222、擬似多階調化部23、および、タイミング制御部24を含んでおり、デジタルガンマ変換部222は温度判定部231を含んでいる。本変形例に係る液晶表示装置300の構成要素のうち、第2の変形例に係る液晶表示装置200と同一の構成要素については、同一の参照符号を付してその説明を省略する。
画像には、メニュー画面などの静止画を中心とする画像(以下、「静止画」という)と、テレビやDVDなどの動画を中心とする画像(以下、「動画」という)とがある。動画は、静止画よりも液晶の応答速度の影響を受けて動画の表示性能が悪くなりやすい。そこで、液晶表示装置に入力された映像信号が動画であるのか、静止画であるのかを判定し、動画であると判定したときに、液晶の応答速度を改善させることができれば、画像の表示品位を向上させることができる。
図11は、本発明の第2の実施形態の変形例に係る液晶表示装置500の構成を示すブロック図である。図11に示す液晶表示装置500は、表示制御回路511、2個のLUT512a、512b、走査線駆動回路13、データ線駆動回路14、および、液晶パネル15を備えている。表示制御回路511は、デジタルガンマ変換部522、擬似多階調化部23、および、タイミング制御部24を含んでおり、デジタルガンマ変換部522は入力信号判定部535を含んでいる。本変形例に係る液晶表示装置500の構成要素のうち、第2の実施形態に係る液晶表示装置400と同一の構成要素については、同一の参照符号を付してその説明を省略する。
上記各実施形態およびその変形例に係る液晶表示装置の液晶パネル15は、ノーマリブラックモード(垂直配向モード)の液晶パネルである。しかし、液晶パネルには、ノーマリブラックモードだけでなく、TN(Twisted Nematic)方式などのノーマリホワイトモードの液晶パネルもある。そこで、本発明の発明者は、図1に示す液晶表示装置10において、液晶パネル15の代わりに、ノーマリホワイトモードの液晶パネルを使用したときに、液晶の応答速度が改善されるか否かの実験を行なった。
本発明の実施形態に係る液晶表示装置には、各種の変形例が考えられる。例えば、温度センサは、液晶パネルの表面以外の場所(例えば、液晶パネルを含む液晶モジュールの筐体の表面など)に設けられ、液晶パネルの温度として液晶パネルの表面温度と一定の関係がある温度を検知してもよい。また、上記各実施形態またはその変形例において、表示制御回路を、少なくとも走査線駆動回路およびデータ線駆動回路のいずれかと一体化してもよい。また、上記各方法で液晶表示装置以外の表示装置を構成することもできる。これら変形例に係る液晶表示装置および表示装置も、第1および第2の実施形態に係る液晶表示装置と同様の効果を奏する。
11、211、411、511…表示制御回路
12、112a~c、212a~b、312a~d、412、512a~b…LUT
13…走査線駆動回路
14…データ線駆動回路
15…液晶パネル
16…温度センサ
21、421…入力部
22、222、422、522…デジタルガンマ変換部
23…擬似多階調化部
24…タイミング制御部
31、231…温度判定部
435、535…入力信号判定部
32、436…切換スイッチ
Claims (11)
- 入力映像信号に対してガンマ変換を行い、画像を表示する表示装置であって、
表示パネルと、
前記入力映像信号に対してガンマ変換を行なうデジタルガンマ変換部と、
ガンマ変換後の映像信号に基づき、前記表示パネルを駆動する駆動部と、
前記駆動部に所定のタイミングで前記映像信号および制御信号を出力するタイミング制御部と、
前記デジタルガンマ変換部でガンマ変換を行なうときに用いられる第1のテーブルと、
所定の条件に該当するか否かを判定する判定部とを備え、
前記第1のテーブルは、前記入力映像信号の低階調側の入力階調に対応する輝度に所定の倍率を乗算した輝度になるように前記入力映像信号を変換するガンマ変換結果を記憶するテーブルであり、
前記デジタルガンマ変換部は、前記所定の条件に該当すると判定されたときには、前記第1のテーブルを用いてガンマ変換を行なうことを特徴とする、表示装置。 - 前記表示パネルの温度を検知する温度検知部と、
前記入力映像信号を前記デジタルガンマ変換部または前記タイミング制御部のいずれかに出力するように切り換えるための切換スイッチとをさらに備え、
前記判定部は、前記温度検知部で検知された温度が所定値よりも高いか否かを判定し、
前記切換スイッチは、前記検知された温度が前記所定値以下と判定されたときには、前記入力映像信号を前記デジタルガンマ変換部に出力するように切り換え、前記所定値よりも高いと判定されたときには、ガンマ変換を行なわずに、前記入力映像信号を前記タイミング制御部に出力するように切り換えることを特徴とする、請求項1に記載の表示装置。 - 前記表示パネルの温度を検知する温度検知部と、
前記入力映像信号のすべての入力階調に対応する輝度に乗算する倍率を1倍として求めたガンマ変換結果を記憶する第2のテーブルとをさらに備え、
前記判定部は、前記デジタルガンマ変換部に含まれ、前記温度検知部で検知された温度が所定値よりも高いか否かを判定し、
前記デジタルガンマ変換部は、前記検知された温度が前記所定値以下であると判定されたときには、前記第1のテーブルを用いてガンマ変換を行い、前記検知された温度が前記所定値よりも高いと判定されたときには、前記第2のテーブルを用いてガンマ変換を行なうことを特徴とする、請求項1に記載の表示装置。 - 前記第1のテーブルは、温度に応じて異なるガンマ変換結果を記憶した複数のテーブルを含み、
前記複数のテーブルのうち、より低い温度で使用されるテーブルほど、前記所定の倍率をより大きくして求めたガンマ変換結果を記憶し、
前記デジタルガンマ変換部は、前記複数のテーブルの中から前記温度検知部で検知された温度に応じて1個のテーブルを選択し、選択したテーブルを用いてガンマ変換を行なうことを特徴とする、請求項1に記載の表示装置。 - 前記表示パネルの温度を検知する温度検知部と、
前記入力映像信号の入力階調を所望の出力階調に変換するためのガンマ変換結果を記憶する第3のテーブルとをさらに備え、
前記第1のテーブルは、入力階調を所望の出力階調になるようにした後に、低階調側の入力階調に対応する輝度に前記所定の倍率を乗算した輝度になるように、前記入力映像信号を変換するガンマ変換結果を記憶するテーブルであり、
前記判定部は、前記デジタルガンマ変換部に含まれ、前記温度検知部で検知された温度が所定値よりも高いか否かを判定し、
前記デジタルガンマ変換部は、前記検知された温度が前記所定値以下であると判定されたときには、前記第1のテーブルを用いてガンマ変換を行い、前記検知された温度が前記所定値よりも高いと判定されたときには、前記第3のテーブルを用いてガンマ変換を行なうことを特徴とする、請求項1に記載の表示装置。 - 前記判定部の判定結果に応じて、入力映像信号を切り換えてデジタルガンマ変換部とタイミング制御部のいずれかに出力するように切り換えるための切換スイッチをさらに備え、
前記判定部は、前記入力映像信号の種類を判定し、
前記切換スイッチは、前記入力映像信号が動画であると判定されたときには、前記入力映像信号を前記デジタルガンマ変換部に出力するように切り換え、静止画であると判定されたときには、ガンマ変換を行なわずに、前記入力映像信号を前記タイミング制御部に出力するように切り換えることを特徴とする、請求項1に記載の表示装置。 - 前記入力映像信号のすべての入力階調に対応する輝度に乗算する倍率を1倍として求めたガンマ変換結果を記憶する第2のテーブルをさらに備え、
前記判定部は、前記デジタルガンマ変換部に含まれ、前記入力映像信号の種類を判定し、
前記デジタルガンマ変換部は、前記入力映像信号が動画であると判定されたときには、前記第1のテーブルを用いてガンマ変換を行い、前記入力映像信号が静止画であると判定されたときには、前記第2のテーブルを用いてガンマ変換を行なうことを特徴とする、請求項1に記載の表示装置。 - 前記入力映像信号の入力階調を所望の出力階調に変換するためのガンマ変換結果を記憶する第3のテーブルをさらに備え、
前記第1のテーブルは、入力階調を所望の出力階調になるようにした後に、低階調側の入力階調に対応する輝度に前記所定の倍率を乗算した輝度になるように、前記入力映像信号を変換するガンマ変換結果を記憶するテーブルであり、
前記判定部は、前記デジタルガンマ変換部に含まれ、前記入力映像信号の種類を判定し、
前記デジタルガンマ変換部は、前記入力映像信号が動画であると判定されたときには、前記第1のテーブルを用いてガンマ変換を行い、前記入力映像信号が静止画であると判定されたときには、前記第3のテーブルを用いてガンマ変換を行なうことを特徴とする、請求項1に記載の表示装置。 - 前記所定の倍率は、1よりも大きく、かつ、2以下の倍率であることを特徴とする、請求項1に記載の表示装置。
- 前記デジタルガンマ変換部は、前記入力映像信号をより多階調の映像信号に変換し、
前記デジタルガンマ変換部から出力された前記映像信号に対して擬似多階調化処理を施し、得られた映像信号を前記タイミング制御部に出力する擬似多階調化部をさらに備えたことを特徴とする、請求項1に記載の表示装置。 - 前記表示パネルはノーマリブラックモードの液晶パネルであることを特徴とする、請求項1に記載の表示装置。
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- 2010-11-02 JP JP2011547388A patent/JP5449404B2/ja not_active Expired - Fee Related
- 2010-11-02 WO PCT/JP2010/069506 patent/WO2011080963A1/ja active Application Filing
- 2010-11-02 US US13/513,907 patent/US20120249619A1/en not_active Abandoned
- 2010-11-02 EP EP10840822.0A patent/EP2521120A4/en not_active Withdrawn
- 2010-11-02 CN CN201080054407.2A patent/CN102640209B/zh not_active Expired - Fee Related
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CN104751772A (zh) * | 2013-12-26 | 2015-07-01 | 昆山工研院新型平板显示技术中心有限公司 | 有机发光显示器及其数据驱动芯片、数据驱动方法 |
Also Published As
Publication number | Publication date |
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JPWO2011080963A1 (ja) | 2013-05-09 |
CN102640209A (zh) | 2012-08-15 |
EP2521120A1 (en) | 2012-11-07 |
EP2521120A4 (en) | 2013-07-24 |
JP5449404B2 (ja) | 2014-03-19 |
US20120249619A1 (en) | 2012-10-04 |
CN102640209B (zh) | 2015-04-08 |
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