WO2005038766A1 - マトリックス型表示装置及びその駆動方法 - Google Patents
マトリックス型表示装置及びその駆動方法 Download PDFInfo
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- WO2005038766A1 WO2005038766A1 PCT/JP2004/015192 JP2004015192W WO2005038766A1 WO 2005038766 A1 WO2005038766 A1 WO 2005038766A1 JP 2004015192 W JP2004015192 W JP 2004015192W WO 2005038766 A1 WO2005038766 A1 WO 2005038766A1
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- characteristic
- pixel
- key
- area ratio
- distribution area
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Classifications
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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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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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
-
- 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
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
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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
- G09G2320/028—Improving the quality of display appearance by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
Definitions
- the present invention relates to a matrix type display device which displays an image by driving a plurality of pixels arranged in a matrix, and a driving method thereof.
- a liquid crystal display using a TN (Twisted Nematic) method since the liquid crystal has anisotropy of refractive index and torsional alignment, light passing through the liquid crystal layer has various complexities depending on its direction and angle. Due to the refraction effect, complicated viewing angle dependence appears (for example, the phenomenon that the entire screen becomes whitish at an upward viewing angle, the entire screen becomes dark at a downward viewing angle, and the contrast is inverted at the low brightness part of the image). For such a viewing angle characteristic, various techniques for widening the viewing angle with respect to brightness, hue, contrast characteristics, gradation characteristics, etc. have been developed.
- n + 1 levels are driven only by black and white binary, and the other levels are gray levels and white or black combined
- the liquid crystal display device for switching the sex transmittance characteristics with respect to the input level
- Japanese Patent Application Laid-Open No. 9-90910 discloses that a plurality of applied voltages generated by a plurality of conversion methods for converting an input signal of the same level into a different applied voltage. It discloses that two different types of key characteristics are switched so that the distribution area ratios become the same by selectively applying the voltage to each pixel.
- the former liquid crystal display uses binary black and white only when the transmittance to be displayed is 50%, and uses a combination of gray level and white or black for other transmittances. 0% improves viewing angle characteristics
- the combined key characteristics deviate significantly from the original key characteristics, and Good viewing angle characteristics cannot be realized.
- An object of the present invention is to provide a matrix type display device capable of realizing good viewing angle characteristics for a wide range of transmittance and a driving method thereof.
- a matrix type display device is a matrix type display device that drives a display panel having a plurality of pixels arranged in a matrix to display an image, and converts an input video signal
- One of the key characteristic pairs is selected from among the selected key characteristic pairs, and the first distribution area ratio of the pixels driven by the T- converted video signal based on the first key characteristic of the selected key characteristic pair, and the key conversion is performed based on the second key characteristic.
- the display is performed from the 2 ⁇ outputs converted by the conversion means so that the second distribution area ratio of the pixels driven by the video signal is a predetermined distribution area ratio with respect to the corresponding characteristic pair.
- the video signal is converted using ⁇ ( ⁇ is an integer of 2 or more) key characteristic pairs composed of different first and second key characteristics, and the video signal is converted according to the transmittance to be displayed.
- ⁇ is an integer of 2 or more
- the video signal is converted according to the transmittance to be displayed.
- one key characteristic pair is selected from the ⁇ key characteristic pairs, and the first distribution area ratio of the pixel driven by the video signal r-converted by the first ⁇ characteristic of the selected key characteristic pair is obtained.
- 2nd characteristic From the 2 n outputs to the display panel so that the second distribution area ratio of the pixels driven by the r-converted video signal becomes a predetermined distribution area ratio with respect to the corresponding characteristic pair.
- the video signal converted by the first and second key characteristics suitable for the transmittance to be displayed is selected so as to have a distribution area ratio suitable for the transmittance to be displayed.
- good viewing angle characteristics can be realized for a wide range of transmittance.
- the selecting means converts the first distribution area ratio and the second distribution area ratio into a predetermined distribution area ratio in a block unit having (n + 1) pixels as one block. It is preferable to select an output to be supplied to the display panel from the 2 n outputs thus obtained.
- the first distribution area ratio and the second distribution area ratio of each key characteristic pair are kZ (n + 1) and (l_k) / (n + 1) when k is an integer of 1 to n. It is preferable to select from the following.
- the first distribution area ratio and the second distribution area ratio can be set to an appropriate distribution area ratio with respect to the transmittance to be displayed in a block unit in which (n + 1) pixels are one block. Therefore, good viewing angle characteristics can be realized for a wide range of transmittance using a normal display panel in which each pixel has the same configuration.
- the selection means is configured to perform a conversion by the conversion means such that the first distribution area ratio and the second distribution area ratio become a predetermined distribution area ratio in units of a block in which one pixel constitutes one block.
- An output to be supplied to the display panel may be selected from the 2 n outputs thus obtained.
- the first distribution area ratio and the second distribution area ratio of each characteristic pair are preferably selected from 1 (m + 1) and mZ (m + 1).
- the first distribution area ratio and the second distribution area ratio should be set to an appropriate distribution area ratio with respect to the transmittance to be displayed in units of a block in which the first sub-pixel and the second sub-pixel constitute one block.
- Have two types of sub-pixels A good viewing angle characteristic can be realized for a wide range of transmittance by using a display panel.
- the second pixel area Sb satisfies the relationship of 1.5 Sa ⁇ Sb ⁇ 3Sa. In this case, it is possible to achieve good viewing angle characteristics over a wide range of transmittance by using a display panel having two types of sub-pixels without deteriorating display quality.
- the selection unit is configured by the conversion unit such that the first distribution area ratio and the second distribution area ratio become a predetermined distribution area ratio in block units each including two pixels as one block.
- the output is supplied to the display panel from the 2 n outputs that have been converted using the characteristics. The output may be selected.
- the first distribution area ratio and the second distribution area ratio of each key characteristic pair are 1 / (2 + 2m), m / (2 + 2m), 2 / (2 + 2m), ( 1 + m) / (2 + 2m), 2m / (2 + 2m), (2 + m) / (2 + 2m) and (2m + l) / (2 + 2m) It is preferable to select from among them.
- the first distribution area ratio and the second distribution area ratio should be displayed in block units with two first sub-pixels and two second sub-pixels as one block. Therefore, the number of settable distribution area ratios can be increased to increase the number of characteristic pairs, and a wide range of transmittance can be obtained by using a display panel with two types of sub-pixels. Better viewing angle characteristics can be realized.
- the second pixel area Sb satisfies the relationship of 1.2 Sa ⁇ Sb ⁇ 2Sa. In this case, a better viewing angle characteristic can be realized for a wide range of transmittance by using a display panel having two types of sub-pixels without deteriorating the display quality.
- the selection means selects an output to be supplied to the display panel from 2n outputs converted by the conversion means in units of one pixel composed of an R pixel, a G pixel, and a B pixel.
- the selecting means selects an output to be supplied to the display panel from among the 2 n outputs converted by the converting means for each of the R, G, and B pixels with the R, G, and B pixels as one pixel. It is preferable to select.
- the key characteristics can be switched in each pixel unit of the R pixel, the G pixel, and the B pixel, so that the key characteristics corresponding to the characteristics of the R pixel, the G pixel, and the B pixel can be used. Better viewing angle characteristics with respect to transmittance can be realized.
- the display panel is preferably a liquid crystal display panel.
- a liquid crystal display device having a large viewing angle characteristic good viewing angle characteristics can be realized for a wide range of transmittance.
- a driving method of a matrix type display device is a method of driving a matrix type display device that displays a picture by driving a display panel having a plurality of pixels arranged in a matrix.
- One of the ⁇ characteristic pairs is selected from among the ⁇ characteristic pairs, and the first distribution area ratio of the pixels driven by the video signal T-converted by the first T characteristic of the selected ⁇ characteristic pair, and the second In the conversion step, 2 n is converted in such a manner that the second distribution area ratio of the pixels driven by the video signal that has been converted by the characteristic is a distribution area ratio that is predetermined for the pair of the characteristic. From output to display panel It is intended to include a selection step of selecting an output that sheet.
- the video signal is converted using n (n is an integer of 2 or more) characteristic pairs having different first and second characteristic values, and is displayed.
- One of the n characteristic pairs is selected from the n characteristic pairs according to the power transmittance, and the pixel driven by the video signal converted by the first characteristic of the selected characteristic pair is selected.
- the first distribution area ratio and the 2 out of the 2 n outputs so that the second distribution area ratio of the pixels driven by the video signal converted by the ⁇ characteristic is a predetermined distribution area ratio for the pair of ⁇ characteristics. Since the output to be supplied to the display panel is selected, the video signal converted by the first and second key characteristics suitable for the transmittance to be displayed has a distribution area ratio suitable for the transmittance to be displayed. It is possible to realize good viewing angle characteristics for a wide range of transmittance.
- FIG. 1 is a block diagram showing a configuration of the liquid crystal display device according to the first embodiment of the present invention.
- FIG. 2 is a characteristic diagram for explaining an example of a first-type first key characteristic 1A and a second key characteristic 2A used in the liquid crystal display device shown in FIG.
- FIG. 3 is a characteristic diagram for explaining an example of a second type of first key characteristic 1B and second key characteristic 2B used in the liquid crystal display device shown in FIG.
- FIG. 4 is a characteristic diagram for explaining an example of a third type of first key characteristic 1C and second key characteristic 2C used in the liquid crystal display device shown in FIG.
- FIG. 5 is a schematic diagram showing an example of a first to third type of characteristic characteristic switching pattern used in the liquid crystal display device shown in FIG.
- FIG. 6 is a characteristic diagram for explaining an example of key characteristic control according to the transmittance by the liquid crystal display device shown in FIG.
- FIG. 7 is a block diagram showing a configuration of the liquid crystal display device according to the second embodiment of the present invention.
- FIG. 8 is a schematic diagram showing a configuration of a pixel of the liquid crystal panel shown in FIG.
- FIG. 9 shows a first-type first-a characteristic 1A, a first-type second-a characteristic 2A, and a second-type first-a characteristic used in the liquid crystal display device shown in FIG. 1B is a characteristic diagram for explaining an example of 1B and a second type of second key characteristic 2B.
- FIG. 10 is a characteristic diagram for explaining an example of ⁇ characteristic control according to the transmittance by the liquid crystal display device shown in FIG.
- FIG. 11 is a block diagram showing a configuration of a liquid crystal display device according to a third embodiment of the present invention. It is a lock figure.
- FIG. 12 is a schematic diagram showing a configuration of a pixel of the liquid crystal panel shown in FIG. 11, and FIG. 13 is a first to seventh types of first-key characteristics used in the liquid crystal display device shown in FIG.
- FIG. 4 is a characteristic diagram for explaining an example of A to G 1G and second key characteristics A 2 A to G 2G.
- FIG. 14 is a characteristic diagram for explaining an example of key characteristic control according to the transmittance by the liquid crystal display device shown in FIG.
- FIG. 15 is a first partially enlarged view of the characteristic diagram shown in FIG.
- FIG. 16 is a second partially enlarged view of the characteristic diagram shown in FIG.
- FIG. 17 is a third partially enlarged view of the characteristic diagram shown in FIG.
- FIG. 18 is a fourth partially enlarged view of the characteristic diagram shown in FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- a matrix type display device according to the present invention will be described with reference to the drawings.
- a liquid crystal display device will be described as an example of a matrix type display device, but a matrix type display device to which the present invention is applied is not particularly limited to this example, and has a viewing angle characteristic.
- the present invention can be similarly applied to other matrix type display devices such as an organic EL (electro-luminescence) display device.
- FIG. 1 is a block diagram showing a configuration of the liquid crystal display device according to the first embodiment of the present invention.
- the liquid crystal display device shown in FIG. 1 is a block diagram showing a configuration of the liquid crystal display device according to the first embodiment of the present invention. The liquid crystal display device shown in FIG.
- a distribution determination circuit 8, a drive circuit 9, and a liquid crystal panel 10 are provided.
- AA conversion circuit la rl B conversion circuit lb, a1C conversion circuit lc, r2 A conversion circuit 2a, a2B conversion circuit 2b, a2C conversion circuit 2c and panel equivalent circuit 6 , R, G, and B color components are input to the video signal IS.
- a synchronization signal HV such as a synchronization signal is input.
- the video signal IS and the synchronization signal HV are signals input from a predetermined video output circuit (not shown) or the like.
- the r 1 A conversion circuit 1 a converts the video signal IS using the first type of first key characteristic 1 A and outputs the converted video signal to the selector 3.
- the ⁇ 2A conversion circuit 2 a converts the video signal IS using the first type of second key characteristic ⁇ 2A, and outputs the converted video signal to the selector 4.
- the first type 1a characteristic 1A and the second type 1a characteristic 2A are complementary to each other, and are a first type characteristic pair used for the video signal IS having a low transmittance. is there.
- FIG. 2 is a characteristic diagram for explaining an example of a first-type first key characteristic 1A and a second key characteristic 2A used in the liquid crystal display device shown in FIG.
- the horizontal axis shows the transmittance to be displayed (corresponding to the input) and the vertical axis shows the transmittance actually displayed (the output corresponds to the input level). (Equivalent) is shown, and each transmittance is a normalized value.
- the reference “characteristic f” in the front view (0 °) is a straight line, and the ⁇ characteristic s in a non-front surface (for example, horizontal 45 °) deviates and deteriorates as shown in the figure.
- the reference key characteristic rf and the key characteristic rs in non-frontal vision are the same in the following embodiments, and the description thereof will not be repeated.
- the 1A conversion circuit 1a has a first-type first key characteristic 1A
- the second conversion circuit 2 & has a first-type second key characteristic 2a.
- A by switching the output of the r 1 A conversion circuit 1 a and the output of the ⁇ 2 A conversion circuit 2 a using a first type of key characteristic pair switching pattern described later, a first type of first key characteristic r 1 A and the first type of second ⁇ characteristic r 2 A are synthesized, and the r characteristic after synthesis becomes the first type of synthesized characteristic A. Comparing this first-type composite characteristic A with the reference characteristic rf at the frontal viewing angle (0 °) and the characteristic characteristic S at non-frontal vision, the deviation from the characteristic f is smaller than the characteristic f.
- the characteristics have been improved.
- the deviation from the reference characteristic f is small in a range where the transmittance to be displayed is low.
- the first type of first key characteristic 1A and second key characteristic 2A are determined based on the skin color of the video signal IS.
- the reason why skin color is used as the standard is that skin color is the most visually sensitive color to humans, and the viewing angle characteristics related to skin color are most easily recognized. This is the same as other key characteristics.
- the 7 1B conversion circuit 1 b converts the video signal IS using the second type of first key characteristic 1 B and outputs the converted video signal to the selector 3.
- the r2B conversion circuit 2b r-converts the video signal IS using the second type of second-key characteristic r2B, and outputs the r-converted video signal to the selector 4.
- the second type first key characteristic 1B and the second key characteristic 2B are complementary key characteristics, and are a second type key characteristic pair used for the video signal IS having an intermediate transmittance. is there.
- FIG. 3 is a characteristic diagram for explaining an example of a second type of first key characteristic 1B and second key characteristic 2B used in the liquid crystal display device shown in FIG. As shown in FIG.
- the ⁇ 1 B conversion circuit 1 b has a second type of first characteristic characteristic 1 B, an ⁇ 2 B conversion circuit 2 b, and a second type of second characteristic characteristic 2 B
- a second type of first characteristic 1B and the second-type second-characteristics 2B are combined, and the combined characteristic becomes the second-type combined-characteristics B.
- This second-type composite characteristic B and the reference characteristic rf at the frontal viewing angle, and the characteristic characteristic s at non-frontal vision s Comparing with, it can be seen that the deviation from f is smaller than rs, and that the characteristics are improved. Also, it can be seen that the deviation from the reference characteristic f is small when the transmittance to be displayed is in the middle range.
- the distribution area ratio of the pixels driven using the output of the ⁇ 1 B conversion circuit 1 b ′ and the distribution area ratio of the pixels driven using the output of the ⁇ 2 B conversion circuit 2 b are 2 4: 2 Z 4 is set, and the transmittance to be displayed is X, so that 2 XT 1 B (x) +2 X r 2 B (x); The key characteristic 1B and the second key characteristic 2B are determined in advance.
- the T 1 C conversion circuit 1 c converts the video signal IS using the third type of first key characteristic 1 C and outputs the converted video signal to the selector 3.
- the ⁇ 2 C conversion circuit 2 c converts the video signal IS into digital data using the third type of second key characteristic “r 2 C”, and outputs the converted video signal to the selector 4.
- the first key characteristic 1C and the second key characteristic 2C are complementary key characteristics and are a third kind of key characteristic pair used for the video signal IS having high transmittance.
- 5 is a characteristic diagram for explaining an example of a third type of first key characteristic 1C and second key characteristic 2C used in the liquid crystal display device shown in Fig. 1. As shown in FIG.
- the C conversion circuit 1c has a third-type first-a characteristic 1C
- an a2C conversion circuit 2c has a third-type second-a characteristic 2C
- a 1C By switching the output of the conversion circuit 1 c and the output of the ⁇ 2 C conversion circuit 2 c using a third type of characteristic switching pattern for the type 1 described later, the third type 1 characteristic 1 C and the type 3
- the second key characteristic and 2C are synthesized.
- the combined characteristic is the third type of combined characteristic? ⁇ C.
- the distribution area ratio of the pixels driven using the output of the a 1 C conversion circuit 1 c and the distribution area ratio of the pixels driven using the output of the a 2 C conversion circuit 2 c are 3 4 : 1
- the transmittance to be displayed is X, 3
- the configuration of the r conversion circuit is not particularly limited to the above example, and various changes are possible, and various types such as an analog system, an arithmetic system, and a ROM table system can be used.
- various types such as an analog system, an arithmetic system, and a ROM table system can be used.
- the ⁇ characteristics of the RGB signals do not match at all gradations and have a color shift characteristic.
- a key conversion circuit may be provided for each RGB signal.
- the panel equivalent circuit 6 is a circuit having a conversion characteristic equivalent to the input / output characteristic P (X) of the liquid crystal panel 10, and a video signal obtained by converting the video signal IS by the input / output characteristic P (x) of the liquid crystal panel 10. Is output to the key judgment circuit 7 and the distribution judgment circuit 8.
- the key determination circuit 7 specifies the transmittance to be displayed from the video signal converted by the input / output characteristics P (X) of the liquid crystal panel 10 and converts the key with a pair of key characteristics associated with the specified transmittance.
- a selection signal S1 for selecting a key conversion circuit for performing the operation is output to the selectors 3 and 4.
- the relationship between the transmittance and the first to third types of key characteristic pairs is stored in advance in the key determination circuit 7 in a ROM table format or the like.
- the distribution judging circuit 8 specifies the pixel position of the video signal IS on the display screen of the liquid crystal panel 10 based on the vertical synchronizing signal and the horizontal synchronizing signal of the synchronizing signal HV.
- the configuration of the key determination circuit and the distribution determination circuit is not particularly limited to the above example, and the panel equivalent circuit 6 is omitted, and the transmittance is obtained from the video signal IS in the key determination circuit and the distribution determination circuit. Are variously changeable.
- the selector 3 converts the A1A conversion circuit 1a and the A1B conversion according to the selection signal S1. Select the output 1 from the three outputs of the conversion circuit 1b and the 1c conversion circuit 1c and output it to the selector 5. If the transmittance is low, select the output of the 1a conversion circuit 1a. If the transmittance is intermediate, the output of the A1B conversion circuit 1b is selected, and if the transmittance is high, the output of the A1C conversion circuit 1c is selected.
- the selector 4 selects one output from the three outputs of the a2A conversion circuit 2a, the a2B conversion circuit 2b and the a2C conversion circuit 2c according to the selection signal S1.
- Output to selector 5 if the transmittance is low, select the output of A2A conversion circuit 2a. If the transmittance is intermediate, select the output of A2B conversion circuit 2b, and if the transmittance is high. Selects the output of the a2C conversion circuit 2c.
- the selector 5 selects one output from the two outputs of the selectors 3 and 4 according to the selection signal S2 and outputs the selected output to the drive circuit 9, and when the transmittance is low, the first type of key characteristic pair is used.
- the output of the A1A conversion circuit 1a and the output of the A2A conversion circuit 2a are switched so that the switching pattern is obtained. If the transmittance is intermediate, the switching pattern for the second type of the A characteristic pair is used: ⁇ 1 B conversion circuit 1 b and ⁇ 2 Switch the output of B conversion circuit 2 b, and if the transmittance is high, a 1C conversion circuit 1 c and 2 Switches the output of C conversion circuit 2 c.
- FIG. 5 is a schematic diagram showing an example of a switching pattern for the first to third types of characteristic pairs used in the liquid crystal display device shown in FIG. 1.
- FIG. (B) shows a second-type key characteristic pair switching pattern
- (c) shows a third-type key characteristic pair switching pattern.
- FIG. 5 shows only a pattern for four adjacent pixels, this pattern is repeated on the liquid crystal panel 10, and the key characteristics are switched over the entire display screen.
- the polarity of the drive voltage for each pixel is inverted every frame, but the polarity is not shown in FIG.
- the second-type key characteristic pair switching pattern two of the four pixels (lower left pixel and upper right pixel) have the second type first key characteristic. 1B is used, and the second type of second-character characteristic 2B is used for the remaining two pixels. Therefore, the distribution area ratio of the pixels driven using the output of the second type first key characteristic 1B and the distribution of the pixels driven using the output of the second type second key characteristic 2B The area ratio is 2-4: 24.
- the drive circuit 9 is composed of a polarity inversion circuit, a gate drive circuit, a source drive circuit, etc., drives the liquid crystal panel 10 by the source drive circuit using the video signal output from the selector 5, and is represented by the video signal IS. Image is displayed on the LCD panel 10.
- the liquid crystal panel 10 is a liquid crystal panel having a plurality of pixels arranged in a matrix. For example, a TN (Twisted Nematic) liquid crystal panel or a PVA (Patterned Vertical Alignment) liquid crystal panel can be used.
- the number of key characteristic pairs is not particularly limited to the above example, and another number of 2 or 4 or more may be used.
- the switching pattern is not particularly limited to the above example, and other switching patterns may be used.
- the unit of the pixel to be switched is not particularly limited to the above example, and the R pixel and the G pixel Alternatively, the key characteristics may be switched with each of the pixels B and B as one pixel.
- the configuration of the selector is not particularly limited to the above example, and various changes such as configuring the selectors 3 to 5 from one selector are possible.
- the liquid crystal panel 10 is equivalent to an example of a display panel, and includes: a 1 A conversion circuit la, rl B conversion circuit lb, rl C conversion circuit lc, a 2A conversion circuit 2 a, and a 2 B conversion.
- the circuit 2b and the ⁇ 2C conversion circuit 2c correspond to an example of the conversion means, and the selectors 3 to 5, the key determination circuit 7 and the distribution determination circuit 8 correspond to an example of the selection means.
- each characteristic characteristic is divided into blocks each having (n + 1) pixels as one block.
- the distribution area ratio of the first pixel driven by the r-converted video signal according to the first-a characteristic and the distribution area ratio of the second pixel driven by the r-converted video signal by the second-a characteristic thus, one output is selected from the 2 n outputs that have been converted so that the distribution area ratio is preset for each r characteristic pair.
- the distribution area ratio of the first and second key characteristics of each key characteristic pair is k no (n + 1) and (1 k) / (n + 1) is selected.
- FIG. 6 is a characteristic diagram for explaining an example of key characteristic control according to the transmittance by the liquid crystal display device shown in FIG.
- the key determination circuit 7 selects the key 1A conversion circuit 1a and the key 2A conversion circuit 2a.
- the selectors 3 and 4 select the outputs of the ⁇ 1 A conversion circuit 1 a and the output of the 2 A conversion circuit 2 a and output the selected outputs to the selector 5.
- the distribution determination circuit 8 outputs to the selector 5 a selection signal S2 for switching the outputs of the a1A conversion circuit 1a and the a2A conversion circuit 2a with the first type of a-characteristic pair switching pattern.
- the selector 5 switches the outputs of the A1A conversion circuit 1a and the A2A conversion circuit 2a according to the first type of A characteristic pair switching pattern, and is converted by the first type of composite A characteristic A.
- the output video signal is output to the drive circuit 9.
- the a determination circuit 7 outputs a selection signal S1 for selecting the a1B conversion circuit 1b and the a2B conversion circuit 2b. Output to selectors 3 and 4.
- the selectors 3 and 4 select the output of the rl B conversion circuit 1 b and the output of the ⁇ 2 B conversion circuit 2 b and output the selected output to the selector 5.
- the distribution determining circuit 8 outputs to the selector 5 a selection signal S2 for switching the output of the key 1B conversion circuit 1b and the output of the key 2B conversion circuit 2b with the second type key characteristic pair switching pattern.
- the selector 5 switches the output of the rl B conversion circuit lb and the output of the ⁇ 2 B conversion circuit 2 b according to the second type of key characteristic pair switching pattern, and converts the video signal converted by the second type Output to drive circuit 9.
- the liquid crystal panel 10 is converted by the video signal converted by the second type composite ⁇ characteristic ⁇ B having the smallest deviation from the reference r characteristic rf.
- the a determination circuit 7 selects the a 1C conversion circuit 1c and the a 2C conversion circuit 2c.
- Select signal S1 is output to the selectors 3 and 4.
- the selectors 3 and 4 select the output of the rl C conversion circuit 1c and the output of the a 2C conversion circuit 2c and output the same to the selector 5.
- Distribution determination circuit Reference numeral 8 denotes a third-type key characteristic pair switching pattern, which outputs a selection signal S 2 for switching the output of the key 1 C conversion circuit 1 c and the key 2 C conversion circuit 2 c to the selector 5.
- Rl The output of the C conversion circuit lc and the output of the A2C conversion circuit 2c are switched according to the third type of switching pattern for the A characteristic.
- the video signal converted by the synthesizer characteristic C is output to the drive circuit 9.
- the transmittance to be displayed is in the range of TB to 1, the deviation from the reference ⁇ characteristic f is the smallest.
- the liquid crystal panel 10 can be driven by the video signal converted by the small third type of composite characteristic C.
- the video signal IS is r-converted using three r characteristic pairs composed of different first and second key characteristics, and three video signals IS are converted according to the transmittance to be displayed.
- r One characteristic pair is selected from the characteristic pairs,
- the distribution area ratio of the pixels driven by the video signal converted by the first key characteristic of the selected key characteristic pair, and the distribution area ratio of the pixels driven by the T signal converted by the second key characteristic Is selected from the six outputs so that the distribution area ratio is determined in advance for each r characteristic pair, so that the first output that is optimal for the transmittance to be displayed is selected.
- the video signal that has been ⁇ - converted by the second key characteristic is selected with an optimal distribution area ratio with respect to the transmittance to be displayed, and good viewing angle characteristics can be realized with respect to all the transmittances.
- FIG. 7 is a block diagram illustrating the configuration of the liquid crystal display device according to the second embodiment of the present invention.
- the liquid crystal display device shown in FIG. 7 is composed of an a1 conversion circuit 1 &, an r1B conversion circuit lb, an a2A conversion circuit 2a, an a2B conversion circuit 2b, selectors 3 to 5, a panel equivalent circuit 6, It includes a key determination circuit 7, a distribution determination circuit 8, a drive circuit 9, and a liquid crystal panel 10a.
- FIG. 8 is a schematic diagram showing a configuration of a pixel of the liquid crystal panel shown in FIG.
- the liquid crystal panel 10a has a pixel P1 composed of a first sub-pixel S1 having a pixel area Sa and a second sub-pixel S2 having a pixel area 2Sa as one pixel.
- This is a liquid crystal panel in which pixels are arranged in a matrix.
- the first sub-pixel S1 and the second sub-pixel S2 are individually driven by two TFTs (thin film transistors, not shown).
- the ratio of the pixel area of the first sub-pixel S1 to the pixel area of the second sub-pixel S2 is 1: 2
- the first sub-pixel S1 and the second sub-pixel S By using the first key characteristic for one of the two and the second key characteristic for the other, the distribution area ratio of sub-pixels using the first key characteristic and the distribution of sub-pixels using the second key characteristic
- the area ratio can be set to 2/3: 1/3 or 1Z3: 2/3.
- liquid crystal panel 10a various types can be used as long as they have sub-pixels.
- a liquid crystal panel as disclosed in Japanese Unexamined Patent Application Publication No. 10-1425707 can be used.
- the number of sub-pixels included in one pixel is not particularly limited to the above example, and three or more sub-pixels may be used, and the size of each sub-pixel and each pixel does not need to be the same. However, different ones may be used. Regarding these points, the same applies to a third embodiment described later.
- a 1 A conversion circuit la, A IB conversion circuit lb, A 2 A conversion circuit 2 a, r 2 B conversion circuit 2 b, and panel equivalent circuit 6 have video signals separated into R, G, and B color components.
- IS is input, and the distribution determination circuit 8 receives synchronization signals HV such as a vertical synchronization signal and a horizontal synchronization signal of the video signal IS.
- the T 1 A conversion circuit 1 a converts the video signal IS using the first type of first key characteristic 1 A, and outputs the converted video signal to the selector 3.
- the A2A conversion circuit 2a converts the video signal IS using the first type of second-a characteristic a2A, and outputs the converted video signal to the selector 4.
- the first type 1a characteristic 1A and the second type 1a characteristic 2A are complementary to each other, and are a first type characteristic pair used for the video signal IS having a low transmittance. is there.
- the 7 1B conversion circuit 1 b converts the video signal IS using the second type of first key characteristic 1 B, and outputs the converted video signal to the selector 3.
- the ⁇ 2B conversion circuit 2 b converts the video signal IS using the second type of second key characteristic ⁇ 2B, and outputs the converted video signal to the selector 4.
- the second-type first key characteristic 1B and the second key characteristic 2B are complementary key characteristics, and are a second-type key characteristic pair used for the high transmittance video signal IS. is there.
- FIG. 9 shows a first type 1a characteristic 1A, a first type 2a characteristic 2A, a second type 1a characteristic 1B and a first type 1a characteristic 1A used in the liquid crystal display device shown in FIG. FIG.
- FIG. 9 is a characteristic diagram for explaining an example of a second type second key characteristic key 2B.
- the key 1A conversion circuit 1a has a first type first key characteristic 1A
- the 72 A conversion circuit 2a has a first type second key characteristic 1A. 2 A.
- the r 1 B conversion circuit lb has a second type of first r characteristic 1 B
- the 2 B conversion circuit 2 b has a second type of second r characteristic 2 B.
- Panel equivalent circuit 6 is equivalent to input / output characteristics P (X) of LCD panel 10a. And outputs a video signal obtained by converting the video signal IS according to the input / output characteristics P (x) of the liquid crystal panel 10a to the key determination circuit 7 and the distribution determination circuit 8.
- the key determination circuit 7 specifies the transmittance to be displayed from the video signal converted by the input / output characteristic P (X) of the liquid crystal panel 10a, and determines the key characteristic corresponding to the specified transmittance.
- a selection signal S1 for selecting a key conversion circuit for key conversion based on the first and second key characteristics is output to the selectors 3 and 4.
- the distribution determination circuit 8 specifies the pixel position of the video signal IS on the display screen of the liquid crystal panel 10a with reference to the vertical synchronization signal and the horizontal synchronization signal of the synchronization signal HV, and the input / output characteristics of the liquid crystal panel 10a.
- the transmittance to be displayed is specified from the video signal converted by P (X), and the sub-pixels are driven at a distribution area ratio previously associated with the pair of the identified transmittance characteristics. Outputs selection signal S 2 to selector 5.
- the selector 3 selects one output from the two outputs of the A1A conversion circuit 1a and the A1B conversion circuit 1b in accordance with the selection signal S1, and outputs the selected output to the selector 5, and the transmittance is selected. If it is low, select the output of the A1A conversion circuit 1a. If the transmittance is high, select the output of the A1B conversion circuit 1b.
- the selector 4 selects one of the two outputs of the a2A conversion circuit 2a and the a2B conversion circuit 2b according to the selection signal S1 and outputs it to the selector 5, and the transmittance is When the transmittance is high, the output of the a2A conversion circuit 2a is selected. When the transmittance is high, the output of the a2B conversion circuit 2b is selected.
- the selector 5 selects an output to be supplied to the liquid crystal panel 10a from the two outputs of the selectors 3 and 4 according to the selection signal S2 and outputs the output to the drive circuit 9.
- the distribution area ratio of the sub-pixels driven by using the output of one kind of first key characteristic 1A and the second kind of second key characteristic 2A The outputs of the 1A conversion circuit 1a and the 2A conversion circuit 2a are output to the driving circuit 9 so that the distribution area ratio of the sub-pixels driven using the output of (1) is 13: 2/3.
- the transmittance is high, that is, when the second kind of characteristic pair is selected, the second kind of first ⁇
- the distribution area ratio of the sub-pixels driven using the output of the characteristic 1B and the distribution area ratio of the sub-pixels driven using the output of the second type 2a characteristic 2B are 2/3:
- the outputs of the ⁇ 1 B conversion circuit 1 b and the ⁇ 2 B conversion circuit 2 b are output to the drive circuit 9 so as to be 1 Z 3.
- the drive circuit 9 includes a polarity inversion circuit, a gate drive circuit, a source drive circuit, and the like.
- the drive circuit 9 drives the liquid crystal panel 10a using the video signal output from the selector 5, and displays the video signal IS using the video signal IS.
- the displayed image is displayed on the LCD panel 10a. .
- the liquid crystal panel 10a corresponds to an example of a display panel, and the ⁇ 1 A conversion circuit la, ⁇ ⁇ ⁇ conversion circuit lb, the a2A conversion circuit 2a , and the a2B conversion circuit 2b are converted.
- the selectors 3 to 5, the key determination circuit 7, and the distribution determination circuit 8 correspond to an example of the selection means.
- the number of types of the characteristic pairs is n (n is an integer of 2 or more), and each pixel of the display panel has a first sub-area having a first pixel area Sa.
- n is an integer of 2 or more
- each pixel of the display panel has a first sub-area having a first pixel area Sa.
- S b is m XS a, where m> 1
- the first sub-pixel and the second sub-pixel constitute one block.
- An output to be supplied to the liquid crystal panel is selected from the 2 n converted outputs so that the ratio of the pixel to the second distribution area is a distribution area ratio preset for each characteristic pair.
- the Rukoto At this time, the first distribution area ratio and the second distribution area ratio of each key characteristic pair are selected from 1 (m + 1) and m / (m + 1).
- the second pixel area Sb satisfies the following relationship: 1.5 Sa ⁇ Sb ⁇ 3Sa. In this case, a good viewing angle characteristic can be realized for a wide range of transmittance using a display panel having two types of sub-pixels without deteriorating the display quality.
- FIG. 10 shows the liquid crystal display device shown in FIG.
- FIG. 10 is a characteristic diagram for explaining an example of key characteristic control according to transmittance according to FIG. 10.
- the key determination circuit 7 outputs to the selectors 3 and 4 a selection signal S1 for selecting the a1A conversion circuit 1a and the a2A conversion circuit 2a.
- the selectors 3 and 4 select the outputs of the a1A conversion circuit 1a and the r2A conversion circuit 2a and output them to the selector 5.
- the distribution determination circuit 8 drives the first sub-pixel S1 using the output of the first type of first key characteristic 1A and outputs the second sub-pixel S1 using the output of the first type of second key characteristic 2A.
- the selection signal S 2 for driving the sub-pixel S 2 is output to the selector 5.
- the drive circuit 9 drives the first sub-pixel S1 using the output of the first type 1r characteristic 1A and uses the output of the first type 2r characteristic 2A.
- the output of the A1A conversion circuit 1a and the output of the A2A conversion circuit 2a are selected so that the second sub-pixel S2 can be driven, and output to the drive circuit 9.
- the liquid crystal panel is converted by the video signal converted by the first type composite ⁇ characteristic A, which has the smallest deviation from the standard characteristic ⁇ f. 10a can be driven.
- the key decision circuit 7 selects the selection signal S 1 for selecting the end 1 B conversion circuit 1 b and the key 2 B conversion circuit 2 b. Output to 3 and 4.
- the selectors 3 and 4 select the output of the 1B conversion circuit 1b and the output of the 2B conversion circuit 2b, and output the selected output to the selector 5.
- the distribution determination circuit 8 drives the second sub-pixel S2 using the output of the second type of first key characteristic 1B and outputs the first sub-pixel S2 using the output of the second type of second key characteristic 2B.
- a selection signal S2 for driving the sub-pixel S1 is output to the selector 5.
- the drive circuit 9 drives the second sub-pixel S2 by using the output of the second type of first key characteristic 1B, and uses the output of the second type of second key characteristic 2B.
- the output of the r 1 B conversion circuit 1 b and the output of the ⁇ 2 B conversion circuit 2 b are selected so as to drive the first sub-pixel S 1, and output to the drive circuit 9.
- the video signal Is is converted using two pairs of key characteristics including the first and second key characteristics different from each other, and is converted according to the transmittance to be displayed.
- One key characteristic pair is selected from the key characteristic pairs, and the distribution area ratio of the sub-pixels driven by the video signal 7 * converted by the first key characteristic of the selected key characteristic pair, and (2)
- the liquid crystal is selected from the four outputs so that the distribution area ratio of the sub-pixels driven by the video signal converted by the key characteristic becomes a predetermined distribution area ratio for each key characteristic pair. Since the output to be supplied to panel 10a is selected, the video signal converted by the first and second r characteristics, which is optimal for the transmittance to be displayed, is optimal for the transmittance to be displayed. It is selected based on the distribution area ratio, and can achieve good viewing angle characteristics for all transmittances. Wear.
- FIG. 11 is a block diagram showing a configuration of the liquid crystal display device according to the third embodiment of the present invention.
- the liquid crystal display device shown in FIG. 11 has seven rl A conversion circuits 1 a to a 1 G conversion circuit 1 g, seven a 2 A conversion circuits 2 a to a 2 G conversion circuit 2 g, and a selector 3 to 5, a panel equivalent circuit 6, a key determination circuit 7, a distribution determination circuit 8, a drive circuit 9, and a liquid crystal panel 10b.
- FIG. 12 is a schematic diagram showing a configuration of a pixel of the liquid crystal panel shown in FIG.
- the liquid crystal panel 10b has one pixel P1, P2 composed of a first sub-pixel S1 having a pixel area Sa and a second sub-pixel S2 having a pixel area 1.5Sa.
- This is a liquid crystal panel in which a plurality of pixels are arranged in a matrix.
- the first sub-pixel S 1 and the second sub-pixel S 2 are individually driven by two TFTs (not shown), and the two sub-pixels P 1 and P 2 constitute one block BL, and the four sub-pixels S by four TFTs. 1 and S2 are driven individually.
- the ratio of the pixel area of the first sub-pixel S1 to the pixel area of the second sub-pixel S2 is 2: 3, so that the first sub-pixel S1 and the 2
- the distribution area ratio of the sub-pixel using the first key characteristic and the sub-pixel using the second key characteristic 2/10: 8/10, 3/10: 7/10, 4/1 0: 6/10, 5/10: 5/10, 6/1 0: 4/10, 7/10: 3 no 10 or 8/10: 2/10 can be set.
- a 1A conversion circuit 1a to 1G conversion circuit 1g, 2A conversion circuit 2a to 2G conversion circuit 2g, and panel equivalent circuit 6 are separated into R, G, and B color components.
- the video signal IS is input, and the distribution determination circuit 8 receives a synchronization signal HV such as a vertical synchronization signal and a horizontal synchronization signal of the video signal IS.
- the T 1 A conversion circuit 1 a converts the video signal IS using the first type of first key characteristic 1 A, and outputs the converted video signal to the selector 3.
- the A2A conversion circuit 2a converts the video signal IS using the first type of second-a characteristic a2A, and outputs the converted video signal to the selector 4.
- the first-type first key characteristic 1A and the first-type second key characteristic 2A are complementary key characteristics, and the first key characteristic 1A used for the video signal IS having the lowest transmittance is used. It is a pair of T characteristics.
- the a1B conversion circuit 1b to a1G conversion circuit 1g converts / converts the video signal IS using the second to seventh types of first-a characteristics a1B to a1G. Then, the converted video signal is output to selector 3.
- the ⁇ 2 C conversion circuit 2 c to a 2 G conversion circuit 2 g converts the video signal IS using the second to seventh types of second key characteristics 2 ⁇ to ⁇ 2 G, and converts the video signal IS into a video signal. Is output to selector 4.
- the second to seventh types of first keys 1a to 1G and the second to seventh elements of second keys 2a to 2G are complementary to each other.
- the second to seventh types of characteristic pairs used for the video signal IS having the second to seventh lowest transmittance.
- FIG. 13 illustrates an example of first to seventh types of first key characteristics 1 ⁇ to 1G and second key characteristics 2A to 2G used in the liquid crystal display device illustrated in FIG. 11.
- the A1A conversion circuit la has a first type first key characteristic r1A
- the A2A conversion circuit 2a has a first type second key characteristic r2A.
- the a1B conversion circuit 1b to the 1G conversion circuit 1g has second to seventh types of first-a characteristics a1B to a1G
- the 2B conversion circuit 2b to a 2G conversion circuit 2g is a second-to-seventh-type second-a characteristic 2B-? ⁇ Has 2G.
- the panel equivalent circuit 6 is a circuit having a conversion characteristic equivalent to the input / output characteristic P (X) of the liquid crystal panel 10b, and the video signal IS is converted by the input / output characteristic P (x) of the liquid crystal panel 10b.
- the video signal is output to the ⁇ judgment circuit 7 and the distribution judgment circuit 8.
- the key determination circuit 7 specifies the transmittance to be displayed from the video signal converted by the input / output characteristics P (x) of the liquid crystal panel 10b, and determines the key characteristic corresponding to the specified transmittance.
- a selection signal S1 for selecting a key conversion circuit for performing key conversion based on the first and second r characteristics is output to the selectors 3 and 4.
- the distribution determination circuit 8 specifies the pixel position of the video signal IS on the display screen of the liquid crystal panel 10b based on the vertical and horizontal synchronizing signals of the synchronizing signal HV, and the input / output characteristics of the liquid crystal panel 10b. Selection for specifying the transmittance to be displayed from the video signal converted by P (X), and switching the r characteristic to the distribution area ratio previously associated with the r characteristic pair of the specified transmittance Outputs signal S2 to selector 5.
- the selector 3 selects one of the seven outputs of the a1A conversion circuit 1a to the a1G conversion circuit lg according to the selection signal S1 and outputs the selected output to the selector 5, which has the highest transmittance. If it is in the lower range, the output of the ⁇ 1A conversion circuit 1a is selected, and the output of the ⁇ 1B conversion circuit 1b to the ⁇ 1G conversion circuit 1g is selected according to the increase in transmittance.
- the selector 4 selects one of the seven outputs of the a2A conversion circuit 2a to the a2G conversion circuit 2g according to the selection signal S1 and outputs it to the selector 5, and the transmittance is If it is in the lowest range, the output of the a2A conversion circuit 2a is selected, and the output of the a2B conversion circuit 2b to the a2G conversion circuit 2g is selected according to the increase in transmittance.
- the selector 5 selects an output to be supplied to the liquid crystal panel 10b from the seven outputs of the selectors 3 and 4 according to the selection signal S2 and outputs the selected output to the drive circuit 9. That is, the selector 5 operates when the transmittance is in the lowest range. That is, when the first kind of key characteristic pair is selected, the distribution area ratio of the sub-pixels driven using the output of one kind of first key characteristic 1A and the second kind of second key characteristic The output of the A1A conversion circuit 1a and the output of the A2A conversion circuit 2a such that the distribution area ratio of the sub-pixels driven using the output of the A2A becomes 2Z10: 8 ⁇ 10. Is output to the drive circuit 9.
- the distribution area ratios of the sub-pixels driven using the outputs of the sub-pixels driven using the outputs of the sub-pixels driven using the outputs of the sub-pixels driven using the outputs of the second to seventh types Pixel distribution area ratios are 310: 7/1 0, 4/1 0: 6/10, 5/10: 5/10, 6/10: 4/10, 7/1 0: 3/10, 8/10: 2Z10 0 1B conversion circuit 1b to 1G conversion circuit 1g and 2B conversion circuit 2
- the output of the b to r 2 G conversion circuit 2 g is output to the drive circuit 9.
- the drive circuit 9 includes a polarity inversion circuit, a gate drive circuit, a source drive circuit, and the like.
- the drive circuit 9 drives the liquid crystal panel 10b using the video signal output from the selector 5 and displays the image signal IS. The displayed image is displayed on the LCD panel 10b.
- the number of types of the characteristic pairs is n (n is an integer of 2 or more), and each pixel of the display panel has a first sub-area having a first pixel area Sa.
- the first distribution area ratio of the sub-pixel driven by the video signal converted by the first key characteristic and the second distribution area ratio of the sub-pixel driven by the video signal converted by the second key characteristic are:
- An output to be supplied to the liquid crystal panel is selected from the 2 n outputs that have been converted so that a distribution area ratio set in advance for each characteristic pair.
- the first distribution area ratio and the second distribution area ratio of each ⁇ characteristic pair are 1 / (2 + 2m), / (2 + 2m), 2 / (2 + 2m), (1+ m) / (2 + 2m), 2 / (2 + 2m), (2 + m) / (2 + 2m) and ( 2 m + 1) / (2 + 2 m).
- the above-mentioned second pixel area Sb satisfies the relationship of 1.2 Sa ⁇ Sb ⁇ 2Sa. In this case, it is possible to achieve better viewing angle characteristics for a wider range of transmittance by using a display panel having two types of sub-pixels without deteriorating the display quality.
- the liquid crystal panel 10b corresponds to an example of a display panel, and includes a 1A conversion circuit 1a to a 1G conversion circuit 1g and a 2A conversion circuit 2a to 2G conversion circuit 2g.
- the selectors 3 to 5 correspond to an example of the selection means.
- FIG. 14 is a characteristic diagram for explaining an example of key characteristic control according to the transmittance by the liquid crystal display device shown in FIG. 11, and FIGS. 15 to 18 are shown in FIG.
- FIG. 7 is a first to fourth partial enlarged views of the characteristic diagram.
- the 7 determination circuit 7 includes the 1 1A conversion circuit 1 a and the 2 2 A conversion circuit 2.
- a selection signal S1 for selecting a is output to selectors 3 and 4.
- the selectors 3 and 4 select the output of the A1A conversion circuit 1a and the output of the A2A conversion circuit 2a and output them to the selector 5.
- the distribution judging circuit 8 is driven by using the distribution area ratio of the sub-pixels driven using the output of the first type 1a characteristic 1A and the output of the first type 2a characteristic 2a.
- the selection signal S 2 is output to the selector 5 so as to set the distribution area ratio of the sub-pixels to be 2 ⁇ 10: 8/10.
- the selector 5 is driven by using the distribution area ratio of the sub-pixels driven using the output of the first type 1a characteristic 1A and the output of the first type 2a characteristic 2A.
- the output of the 1A conversion circuit 1a and the output of the 2A conversion circuit 2a are selected so that the distribution area ratio of the sub-pixels becomes 210: 8/10, and the first type of synthesis characteristic
- the video signal converted by A is output to the drive circuit 9.
- the transmittance to be displayed is in the range of 0 to TA
- the video signal converted by the first type of composite characteristic TA with the smallest deviation from the reference characteristic rf is obtained.
- the liquid crystal panel 10b can be driven more.
- the ⁇ B determination circuit 7 is a selector for selecting the selection signal S1 for selecting the rlB conversion circuit lb and the 22B conversion circuit 2b to the 11G conversion circuit 1g and the 22G conversion circuit 2g. Output to 3 and 4.
- the selectors 3 and 4 select the outputs of the a1B conversion circuit 1b and the a2B conversion circuit 2b to the a1G conversion circuit 1g and the a2G conversion circuit 2g and output them to the selector 5.
- the distribution determination circuit 8 includes a distribution area ratio of sub-pixels driven using the outputs of the second to seventh types of first key characteristics ⁇ 1B to ⁇ 1G and a second to seventh type second r. 3/10: 7/10, 4/10: 6/10, 5/10: 5/10, 6 / 10: 4/10, 7/10: 3/1 0, 8/10: 2/1 0
- Select signal S2 is output to selector 5.
- the selector 5 is configured to control the distribution area ratio of sub-pixels driven using the outputs of the second to seventh types of first key characteristics ⁇ 1B to ⁇ 1G and the second to seventh types of second key characteristics.
- the distribution area ratios of the sub-pixels driven using the outputs of ⁇ 2 B to ⁇ 2 G are 3 10: 7 Z10, 4/10: 6/10, 5X10: 5/10, 6/10: 4/1, respectively. 0, 7/10: 3/10 8 Z10: 2 10 A1B conversion circuit 1b and A2B conversion circuit 2b to A1G conversion circuit 1g and A2G conversion circuit 2
- the output of g is selected, and the video signal converted by the second to seventh types of composite characteristics r B to G is output to the drive circuit 9.
- the liquid crystal panel 10b can be driven by a video signal that has been converted by the small second to seventh types of combining characteristics B to G.
- the video signal IS is converted using the seven pairs of key characteristics including the first and second key characteristics that are different from each other, and the video signal IS is converted according to the transmittance to be displayed.
- One key characteristic pair is selected from the key characteristic pairs
- the output to be supplied to the LCD panel 10b is selected from the 14 outputs so that the area ratio becomes a predetermined distribution area ratio for each key characteristic pair.
- the video signal 7 "converted by the first and second key characteristics optimal for the transmittance is selected with the optimal distribution area ratio for the transmittance to be displayed, and the visual field is good for all transmittances Angular characteristics can be realized.
- the present invention it is possible to realize good viewing angle characteristics for a wide range of transmittance, and to drive a plurality of pixels arranged in a matrix to display an image. It is useful as a device.
Abstract
Description
Claims
Priority Applications (5)
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CA2534193A CA2534193C (en) | 2003-10-16 | 2004-10-07 | Matrix-type display apparatus, and driving method for the same |
EP04792420A EP1640964B1 (en) | 2003-10-16 | 2004-10-07 | Matrix type display apparatus and method of driving the same |
DE602004031620T DE602004031620D1 (de) | 2003-10-16 | 2004-10-07 | Matrixanzeigevorrichtung und ihr verfahren zum ansteuern |
JP2005514779A JP4019096B2 (ja) | 2003-10-16 | 2004-10-07 | マトリックス型表示装置及びその駆動方法 |
US10/567,015 US7843473B2 (en) | 2003-10-16 | 2004-10-07 | Matrix display with gamma correction based on gamma characteristics pairs and different input transmittance level |
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JP2003356126 | 2003-10-16 | ||
JP2003-356126 | 2003-10-16 |
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US (1) | US7843473B2 (ja) |
EP (1) | EP1640964B1 (ja) |
JP (1) | JP4019096B2 (ja) |
KR (1) | KR100781464B1 (ja) |
CN (1) | CN100429692C (ja) |
CA (1) | CA2534193C (ja) |
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US8803922B2 (en) * | 2007-05-30 | 2014-08-12 | Apple Inc. | Methods and apparatuses for increasing the apparent brightness of a display |
JP5289757B2 (ja) * | 2007-12-13 | 2013-09-11 | ルネサスエレクトロニクス株式会社 | 液晶表示装置、データ駆動ic、及び液晶表示パネル駆動方法 |
JP4840412B2 (ja) * | 2008-06-26 | 2011-12-21 | ソニー株式会社 | 液晶表示装置 |
TWI408656B (zh) * | 2008-12-30 | 2013-09-11 | Innolux Corp | 降低色偏之畫素驅動方法 |
US8866837B2 (en) * | 2010-02-02 | 2014-10-21 | Microsoft Corporation | Enhancement of images for display on liquid crystal displays |
CN103155026B (zh) * | 2010-10-19 | 2015-09-23 | 夏普株式会社 | 显示装置 |
EP2669882B1 (en) | 2012-05-31 | 2019-10-09 | Samsung Display Co., Ltd. | Display device and driving method thereof |
US11011095B2 (en) * | 2018-08-31 | 2021-05-18 | Chongqing Hkc Optoelectronics Technology Co., Ltd. | Display panel, and image control device and method thereof |
CN111833787B (zh) * | 2019-04-16 | 2022-10-11 | 咸阳彩虹光电科技有限公司 | 一种显示面板、装置及其驱动方法 |
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WO2006009106A1 (ja) * | 2004-07-16 | 2006-01-26 | Sony Corporation | 画像表示装置および画像表示方法 |
US7936325B2 (en) | 2005-03-15 | 2011-05-03 | Sharp Kabushiki Kaisha | Display device, liquid crystal monitor, liquid crystal television receiver, and display method |
WO2006098148A1 (ja) * | 2005-03-15 | 2006-09-21 | Sharp Kabushiki Kaisha | 表示装置,液晶モニター,液晶テレビジョン受像機および表示方法 |
JP2007025701A (ja) * | 2005-07-20 | 2007-02-01 | Samsung Electronics Co Ltd | 表示装置の駆動装置 |
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US8154497B2 (en) | 2005-07-20 | 2012-04-10 | Samsung Electronics Co., Ltd. | Driving apparatus for display device |
US8427515B2 (en) | 2006-12-04 | 2013-04-23 | Samusng Display Co., Ltd. | Display device and method of driving the same |
JP2008139891A (ja) * | 2006-12-04 | 2008-06-19 | Samsung Electronics Co Ltd | 表示装置及びその駆動方法 |
JP5293597B2 (ja) * | 2007-03-29 | 2013-09-18 | ソニー株式会社 | 液晶表示装置及び駆動制御回路 |
JP2008275853A (ja) * | 2007-04-27 | 2008-11-13 | Optrex Corp | 液晶表示装置の表示制御方法および液晶表示装置 |
JP2008275854A (ja) * | 2007-04-27 | 2008-11-13 | Optrex Corp | 液晶表示装置の表示制御方法および液晶表示装置 |
JP2008275855A (ja) * | 2007-04-27 | 2008-11-13 | Optrex Corp | 液晶表示装置の表示制御方法 |
WO2011004538A1 (ja) * | 2009-07-10 | 2011-01-13 | シャープ株式会社 | 液晶駆動回路および液晶表示装置 |
US8754837B2 (en) | 2009-07-10 | 2014-06-17 | Sharp Kabushiki Kaisha | Liquid crystal driving circuit and liquid crystal display device |
WO2013022007A1 (ja) * | 2011-08-11 | 2013-02-14 | シャープ株式会社 | 表示装置 |
JP2017527848A (ja) * | 2014-08-18 | 2017-09-21 | 深▲セン▼市華星光電技術有限公司 | 液晶パネルのグレースケール値の設定方法及び液晶ディスプレイ |
JP2017530392A (ja) * | 2014-08-18 | 2017-10-12 | 深▲セン▼市華星光電技術有限公司 | 液晶パネルのグレースケール値の設定方法及び液晶ディスプレイ |
JP2017538148A (ja) * | 2014-11-05 | 2017-12-21 | 深▲セン▼市華星光電技術有限公司 | 液晶パネル及びその画素単位の設定方法 |
JP2018531429A (ja) * | 2015-10-29 | 2018-10-25 | 深▲せん▼市華星光電技術有限公司Shenzhen China Star Optoelectronics Technology Co., Ltd. | 広視野角パネル及び表示装置 |
Also Published As
Publication number | Publication date |
---|---|
US7843473B2 (en) | 2010-11-30 |
CA2534193C (en) | 2011-09-06 |
US20060290626A1 (en) | 2006-12-28 |
CA2534193A1 (en) | 2005-04-28 |
DE602004031620D1 (de) | 2011-04-14 |
EP1640964A1 (en) | 2006-03-29 |
TW200515358A (en) | 2005-05-01 |
CN100429692C (zh) | 2008-10-29 |
KR100781464B1 (ko) | 2007-12-03 |
JP4019096B2 (ja) | 2007-12-05 |
EP1640964B1 (en) | 2011-03-02 |
JPWO2005038766A1 (ja) | 2007-01-25 |
KR20060034719A (ko) | 2006-04-24 |
EP1640964A4 (en) | 2008-06-04 |
CN1833270A (zh) | 2006-09-13 |
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