WO2007074560A1 - Appareil de pilotage de dispositif d'affichage, procédé de pilotage de dispositif d'affichage et dispositif d'affichage - Google Patents

Appareil de pilotage de dispositif d'affichage, procédé de pilotage de dispositif d'affichage et dispositif d'affichage Download PDF

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Publication number
WO2007074560A1
WO2007074560A1 PCT/JP2006/318076 JP2006318076W WO2007074560A1 WO 2007074560 A1 WO2007074560 A1 WO 2007074560A1 JP 2006318076 W JP2006318076 W JP 2006318076W WO 2007074560 A1 WO2007074560 A1 WO 2007074560A1
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Prior art keywords
gradation
temperature
display device
gradations
display
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PCT/JP2006/318076
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English (en)
Japanese (ja)
Inventor
Tomoo Furukawa
Kazuyoshi Fujioka
Katsuya Ogawa
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Sharp Kabushiki Kaisha
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Publication of WO2007074560A1 publication Critical patent/WO2007074560A1/fr

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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
    • 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

Definitions

  • Display device drive device display device drive method, and display device
  • the present invention relates to a drive device for a display device used for a display device (for example, a liquid crystal display device) that is required to have temperature-resistant change characteristics such as for vehicle mounting.
  • a display device for example, a liquid crystal display device
  • liquid crystal display devices have attracted attention as in-vehicle display devices.
  • This in-vehicle liquid crystal display device is desired to guarantee video display performance up to a low temperature of about 20 ° C.
  • the response of the liquid crystal becomes dull and the display quality of video is greatly reduced. There was a problem.
  • Patent Document 1 describes a configuration in which gradation conversion (gradation cut) is performed to reduce the gradation range of input data, and the degree is switched according to temperature.
  • Patent Document 2 discloses a configuration in which the frame rate of video data is lowered stepwise according to the temperature.
  • Patent Document 1 Japanese Published Patent Publication “Japanese Laid-Open Patent Publication No. 2004-348151 (Publication Date: February 9, 2004)”
  • Patent Document 2 Japanese Published Patent Publication “Japanese Patent Laid-Open No. 2004-104209 (Publication Date: April 2, 2004)”
  • the present invention has been made in view of the above problems, and an object of the present invention is to provide a display device driving device capable of improving moving image display performance at low temperatures.
  • the display device drive device of the present invention is a display device drive device that outputs a desired voltage within a reference voltage range to the display device in response to input data. The voltage range is set based on the ambient temperature.
  • the reference voltage range can be set according to the ambient temperature. Therefore, for example, the reference voltage range at low temperatures is expanded to widen the dynamic range of display gradation voltages at low temperatures, or gradation transition emphasis processing is performed on the expanded portion without changing the dynamic range of display gradation voltages ( It can be used for overshoot or overdrive). Therefore, high contrast and high-speed response can be realized even at low temperatures, and moving image display performance can be improved.
  • the input data can be subjected to gradation conversion processing based on the ambient temperature, and the number of display gradations can be reduced from the number of gradations of the input data. Further, gradation transition enhancement processing (preferably gradation transition enhancement processing based on ambient temperature! /) Can be performed.
  • the number of display gradations is reduced from the number of input gradations by compressing the input gradations to display gradations (gradation compression processing). It is also possible to reduce the number of display gradations below the number of input gradations by simply cutting a part of the input gradations to obtain the display gradation (gradation cut). In this way, it is possible to increase the response speed at low temperatures by not including gradations that are difficult to respond to the display gradations. Furthermore, gradations that are not display gradations can be used as gradations for gradation transition enhancement processing (OS gradations). As a result, the response speed at low temperatures can be further improved.
  • OS gradations gradation transition enhancement processing
  • the gradation indicated by the input data is 0 gradation to n gradation
  • the reference voltage range at temperature T1 is set to Vmin to Vmax
  • the reference at temperature T2 lower than temperature T1 is set.
  • the voltage range is set to Vmin, ⁇ Vmax, (Vmin ' ⁇ Vmin and Vmax,> Vmax).
  • gradation conversion processing is not performed and gradations 0 to n are used as display gradations.
  • the gradation conversion process is performed, and the i gradation to the j gradation (0 ⁇ i ⁇ j ⁇ n) may be set as the display gradation.
  • the display gradation voltage range corresponding to the display gradation i gradation to j gradation (0 ⁇ i ⁇ ; j ⁇ n) is Vi, ⁇ Vj, (Vmin ' ⁇ Vi' Vj, Vmax,)
  • the ranges of Vmin, ⁇ Vi, and Vj, ⁇ Vmax ' may be used for gradation transition enhancement processing.
  • j gradation to n gradation (0; j ⁇ n) is displayed gradation. It is also possible to set the display gradation from 0 gradation to i gradation (0 ⁇ i ⁇ n).
  • the frame rate is set based on the ambient temperature. For example, if the frame rate is lowered at low temperatures, the response speed can be improved.
  • the drive device for the display device of the present invention is a digital-analog conversion circuit that can generate a gradation voltage corresponding to each gradation of 0 gradation to m gradation indicated by X-bit data.
  • P gradation to q gradation obtained by cutting at least one of the both ends of the above 0 gradation to m gradation by an amount based on the ambient temperature
  • the display gradation voltage for the input data is selected from the gradation voltage range corresponding to (0 ⁇ p ⁇ q ⁇ m).
  • the gradation transition enhancement process is performed without changing the number of display gradations at a low temperature by using a digital analog conversion circuit that can handle the number of bits more than the number of bits of input data. (Overshoot or overdrive) can be performed, and the video display performance at low temperatures can be improved.
  • the gradation voltage range (reference voltage range of the digital analog conversion circuit) corresponding to 0 gradation to m gradation indicated by the X bit data is Vx to Vy, and the gradation power indicated by the input data is ⁇
  • the range of display gradation voltage is VO ⁇ Vn (Vx ⁇ VO ⁇ Vn ⁇ Vy) and at the temperature T2
  • the display gradation voltage range is set to VO 'to Vn' (Vx ⁇ VO ' ⁇ Vn, ⁇ Vy) by the above cut, and the temperature In T2, the range from V to, is used for gradation transition emphasis processing.
  • the display device drive device of the present invention is a display device drive device that outputs a voltage corresponding to input data to the display device, and can change the range of the voltage that can be output according to the temperature.
  • the output voltage range is Vmin to Vmax.
  • the output voltage range is Vmin 'to Vmax' (Vmin 'Vmin and Vmax,> Vmax)
  • the voltages in the above Vmin and ⁇ Vmin ranges and the above Vmax ⁇ Vmax 'ranges are output (as transition gradation emphasizing voltages) when performing transition gradation emphasis processing.
  • the display device drive device of the present invention is a display device drive device that outputs a voltage corresponding to input data to the display device, and can handle data having a larger number of bits than the number of bits of the input data.
  • the output voltage range is VO to Vn at temperature T1
  • the output voltage range is Vx to Vy (Vx ⁇ VO and Vx ⁇ VO when temperature T2 is lower than temperature T1.
  • the voltage in the above Vx to VO range and the above Vn to Vy range is output when the transition tone emphasis processing is performed (as a voltage for transition tone enhancement). It is characterized by that.
  • the display device drive device of the present invention is a display device drive device that outputs a voltage corresponding to input data to the display device, and can handle data having a larger number of bits than the number of bits of the input data.
  • the temperature output range is Vx to Vy at temperature T1
  • the output voltage range is Vx to Vy at temperature T2 lower than temperature T1.
  • the gradation voltage range is VO 'to Vn, (VO'> Vx and Vn, ⁇ Vy), and the voltage in the above Vx to VO range and the above Vn, to Vy range is the transition gradation. Output when emphasis processing is performed (as voltage for emphasizing transition tone) It is characterized by that.
  • the display device driving method of the present invention is a display device driving method in which a desired voltage within a reference voltage range is output to a display device and driven with respect to input data.
  • the reference voltage range at temperature T1 is set to Vmin to Vmax
  • the reference voltage range at temperature T2 lower than temperature T1 is set to Vmin, ⁇ Vmax.
  • a display device driving method is a display device driving method in which a desired voltage is output to a display device and driven in response to Y-bit input data, and X> Y is satisfied.
  • a digital-analog converter circuit that can generate a gradation voltage corresponding to each gradation from 0 gradation to m gradation indicated by the X bit data, at least one of the both ends of the above 0 gradation to m gradation is surrounded
  • a display device of the present invention includes the above-described display device driving device.
  • FIG. 1 is a block diagram showing a first embodiment of the present invention.
  • FIG. 2 is a block diagram showing Embodiment 2 of the present invention.
  • FIG. 3 is a graph showing gradation-one gradation voltage conversion characteristics of the reference voltage range variable DAC circuit according to the first embodiment.
  • FIG. 4 is a graph showing gradation-one gradation voltage conversion characteristics of the 8-bit DAC circuit in the second embodiment.
  • FIG. 5 is a graph showing gradation-one gradation voltage conversion characteristics of the 8-bit DAC circuit in the second embodiment. It is rough.
  • FIG. 6 is a schematic diagram showing a configuration of a reference voltage range variable DAC circuit according to the first embodiment.
  • FIG. 7 is a schematic diagram for explaining how to apply overshoot during frame thinning.
  • FIG. 8 is a schematic diagram for explaining how to apply overshoot during frame thinning.
  • FIG. 9 is an example of gradation compression in the gradation processing unit in the first embodiment.
  • FIG. 10 shows an example of gradation cut in the gradation processing unit according to the first embodiment.
  • the present liquid crystal display device 1 includes a liquid crystal panel drive device 2 and a liquid crystal panel 3 as shown in FIG.
  • the liquid crystal panel driving device 2 includes a temperature detection unit 5, a signal processing unit 7, a storage unit 6, a liquid crystal controller 18, a source driver 20 including a reference voltage range variable DAC circuit 16, and a gate driver 21.
  • the storage unit 5 includes a first LUT 24 and a second LUT 25.
  • the signal processing unit 7 includes a frame processing unit 10, a gradation processing unit 11, and an OS processing unit 14.
  • the function of each part of the signal processing unit 7 and the liquid crystal controller 18 Control is realized by a processor such as a CPU or a microcomputer (not shown).
  • the temperature detection unit 5 detects the temperature of the liquid crystal display device 1 and transmits it to the signal processing unit 7 and the reference voltage range variable DAC circuit 16 as a temperature signal.
  • the signal processing unit 7 performs processing described later on the input video data using the temperature signal from the temperature detecting unit 5, and uses the processed digital data (gradation data) as a reference voltage range variable DAC circuit 16 Output to.
  • Specific processing contents of the signal processing unit 7 are as follows. In the following description, the input video data is described as 6-bit data (gradation data of 0 to 64 gradations).
  • the frame processing unit 10 determines the frame rate based on the temperature signal from the temperature detection unit 5.
  • frames are thinned out according to the force / temperature signal containing 60 frames of data per second, for example, 30 frames are processed and displayed (this Frame rate is 50 percent).
  • the power of the frame processing unit 10 decreases the frame rate as the temperature decreases (decimates more frames). As the frame rate decreases, the moving image appears to be unstable. It is preferable.
  • the gradation processing unit 11 performs gradation compression processing on the data output from the frame processing unit 10 based on the temperature signal from the temperature detection unit 5.
  • the response of the liquid crystal becomes dull, and display near the minimum and maximum gradations is particularly difficult. Therefore, for example, at a low temperature, the input 0 to 63 gradations are compressed to 16 to 56 gradations. That is, as shown in FIG. 9, the input 0 gradation is converted to 16 gradations, and the output gradation is increased by 5 as the input gradation is increased by 8.
  • the OS processing unit 14 performs gradation transition enhancement processing (overshoot) on the gradation data output from the gradation processing unit 11 based on the temperature signal from the temperature detection unit 5, and the OS Outputs gradation data.
  • the first LUT 24 is used for this gradation transition enhancement processing.
  • the first LUT 24 is a look-up table that combines the previous frame gradation Z, the current frame gradation, and the OS gradation, and a plurality of them are prepared according to the temperature. That is, the OS processing unit 14 selects the first LUT 24 corresponding to the temperature signal and outputs the OS gradation using this. However, when there is no need for overshoot, such as when there is no tone transition, the tone processing unit 11 outputs the output tone as it is. For example, at room temperature, if the previous frame is 24 gradations and the current frame is 40 gradations, 43 gradations are output as the OS gradation, and at low temperatures, the previous frame is 24 gradations and the current frame power is 0 gradation. For example, 50 gradations are output as the OS gradation.
  • the liquid crystal controller 18 controls the source driver 20 including the reference voltage range variable DAC circuit 16 and the gate driver 21.
  • the source driver 20 and the gate driver 21 drive a source line and a gate line (not shown) arranged in the liquid crystal panel 3.
  • the output voltage is written to pixels arranged in a matrix near the intersection of the source line and the gate line, and the liquid crystal panel 3 is displayed.
  • the reference voltage range variable DAC circuit 16 converts the gradation output from the OS processing unit 14 into an analog output voltage based on the temperature signal from the temperature detection unit 5.
  • Figure 6 shows a configuration example for realizing this.
  • variable resistors R0, Rl, R2 ' ⁇ -R (n + 1) are connected in series, and the potential between each variable resistor is V0 (minimum reference Voltage), VI, V2 ' ⁇ ⁇ ⁇ (maximum reference voltage).
  • the second LUT 25 of the storage unit 6 is a look-up table in which gradation and resistance value data (for example, 10-bit data) are combined, and a plurality of second LUTs 25 are prepared according to the temperature.
  • the liquid crystal controller 18 selects the second LUT 25 according to the temperature signal and outputs resistance value data to each of the variable resistors R0, R1, R2 '.
  • the resistance values of the variable resistors R0, Rl, R2-... are changed.
  • the reference voltage range is changed, and the correspondence between each gradation (the gradation output from the OS processing unit 14) and the gradation voltage becomes variable according to the temperature.
  • FIG. 3 is a graph showing an example of gradation-voltage conversion for each temperature ( ⁇ 1 ⁇ ⁇ 2) by the reference voltage range variable DAC circuit 16.
  • T1 is normal temperature and ⁇ 2 is low temperature (for example, -20 ° C or less).
  • the reference voltage range is set from 2.5V (Vmin) to 6.3V (Vmax), and the display gradation voltage range is the gradation voltage corresponding to 0 gradation 2.5V power
  • the gradation voltage corresponding to 63 gradations is 6.3 V, and a gradation voltage as shown in the graph of FIG. 3 is output for each gradation of 0 to 63 gradations inputted.
  • the reference voltage range is set to 0.5 V (Vmin ') to 8.
  • OV (V max') the display gradation voltage range is 16 gradations.
  • the gradation voltage corresponding to (display gradation) 2.5V to 56 gradations
  • the gradation voltage as shown in the graph of Fig. 3 is output. Note that 0.5 to 2.5 V (2.5 V not included) corresponding to 0 to 15 gradations in Fig. 3 and 6.3 to 8.0 V (6.3 V not included) corresponding to 57 to 63 gradations.
  • the key is input to the reference voltage range variable DAC circuit 16).
  • gray scales that are not display gray scales are used as OS gray scales, and the extended reference range (0.5 to 8.0 V) is used as the output voltage range, so that the response speed at low temperatures is further improved. Can be improved.
  • the display gradation voltage range (2.5 to 6.3 V) is maintained as it is by extending the reference voltage range from room temperature (T1) at low temperatures (T2).
  • the extended portion (0.5 to 2.5 V-6.3 to 8.0 V) can be used for overshoot. Therefore, high contrast and high-speed response can be realized even at low temperatures, and moving image display performance can be improved.
  • the liquid crystal display device 101 includes a liquid crystal panel driving device 102 and a liquid crystal panel 103 as shown in FIG.
  • the liquid crystal panel drive device 102 includes a temperature detection unit 105, a signal processing unit 107, a storage unit 106, a liquid crystal controller 118, a source driver 120 including an 8-bit DAC circuit 116, and a gate driver 121.
  • the storage unit 106 includes a first LUT 124.
  • the signal processing unit 107 includes a frame processing unit 110, a gradation processing unit 111, and And an OS processing unit 114.
  • the functions of each part of the signal processing unit 107 and the control of the liquid crystal controller 118 are realized by a processor such as a CPU or a microcomputer (not shown).
  • the temperature detection unit 105 detects the temperature of the liquid crystal display device 101, and transmits this to the signal processing unit 107 as a temperature signal.
  • the signal processing unit 107 performs processing to be described later on the input video data using the temperature signal from the temperature detection unit 105 !, and outputs the processed digital data (gradation data) to the 8-bit DAC circuit 116. Output.
  • Specific processing contents of the signal processing unit 107 are as follows. In the following, the input video data is described as 6-bit data (gradation data of 0 to 64 gradations).
  • the frame processing unit 110 has the same function as the frame processing unit 10 shown in FIG.
  • the gradation processing unit 111 performs gradation conversion processing based on the temperature signal from the temperature detection unit 105. That is, the 6-bit data output from the frame processing unit 110 is converted to 8-bit display gradation data. For example, at room temperature (temperature T1), 6-bit 0 gradation is converted to 64-bit expression with 8 bits, 16-bit gradation with 6 bits is converted to 96 gradations with 8-bit expression, and 32 gradations of 6 bits are 8 bits. Representing 128 gray scales [8, 48, 8 and 8 shades, 160 representing 16 dots [63, 6, 63, 16 shades, 8-bit representation, 188 Convert to gradation.
  • 6-bit 0 gradation is converted to 64 gradation of 8-bit representation
  • 6-bit 16 gradation is converted to 96 gradation of 8-bit representation
  • 6-bit 32 gradation is 8 Converts 6-bit 48 gradations to 8-bit representation 160 gradations and 6-bit 63 gradations to 8-bit representation 188 gradations to 128-bit gradations.
  • the OS processing unit 114 Based on the temperature signal from the temperature detection unit 105, the OS processing unit 114 performs gradation transition emphasis (overdrive) processing on the display gradation from which the gradation processing unit 111 also outputs, and the OS Output gradation.
  • the first LUT 24 is used for this gradation transition enhancement processing.
  • the first LUT 24 is a lookup table that combines the previous frame gradation Z current frame gradation and the OS gradation, and a plurality of them are prepared according to the temperature. That is, the OS processing unit 114 selects the first LUT 124 corresponding to the temperature signal and outputs the OS gradation using this.
  • the gradation output from the gradation processing unit 111 is output as it is. For example, at normal temperature, if the previous frame is 96 gradations and the current frame is 160 gradations, 172 gradations are output as the OS gradation, and at low temperatures, the previous frame is 96 gradations and the current frame is 160 gradations If the OS gradation is 186 floor Output the key.
  • the liquid crystal controller 118 controls the source driver 120 including the 8-bit DAC circuit 116 and the gate driver 121.
  • the source driver 120 and the gate driver 121 drive a source line and a gate line (not shown) arranged on the liquid crystal panel 103.
  • the output voltage is written to pixels arranged in a matrix near the intersection of the source line and the gate line, and the liquid crystal panel 103 is displayed.
  • the 8-bit DAC circuit 116 converts the gradation output from the OS processing unit 114 into an analog voltage.
  • This 8-bit DAC circuit 116 has a reference voltage range of 0.5 V (Vx) to 8.0 V (Vy), and the gradation voltage corresponding to 0 gradation is 0.5 V and the gradation corresponding to 255 gradations.
  • the regulated voltage is 8.0V.
  • FIG. 4 is a graph showing an example of gradation-gradation voltage conversion for each temperature (Tl-T2) by the 8-bit DAC circuit 116.
  • T1 is normal temperature and T2 is low temperature (for example, -20 ° C or less).
  • the display gradation voltage range corresponds to gradation voltage 2.5V (V0) corresponding to 8 bits 64 gradations (6 bits 0 gradation) to 8 bits 188 gradations (6 bits 63 gradations).
  • the gradation voltage is 6.3V (Vn).
  • a gradation voltage as shown in the graph of FIG. 4 is generated for each gradation (64) of 64 to 192 gradations to which the OS processing unit 14 force is also input.
  • the output voltage range is 2.5V to 6.3V, which is the same as the display gradation voltage range.
  • the display gradation voltage range corresponds to gradation voltage 2.5V (V0,) corresponding to 8 bits 64 gradations (6 bits 0 gradation) to 8 bits 188 gradations (6 bits 63 gradations).
  • the gradation voltage to be used is 6.3V (Vn,).
  • the gradation voltage as shown in the graph of Fig. 4 is applied to 64 gradations (corresponding to 6 bits 0 to 63 gradations) out of 64 to 192 gradations where the OS processing unit 14 power is also input. Is output.
  • T 2 [Koo! Take 0 to 64 gradations (corresponding to 0.5 to 2.5 V (not including 2.5 V)) and 192 to 255 gradations 6.3 to 8 0V (not including 6.3V) is input as the OS gradation (for example, if the previous frame is 190 gradations and the current frame is 96 gradations in T2, 40 gradations are used as the OS gradation) Input to the 8-bit DAC circuit 116). Therefore, at T2, the output voltage The range is 0.5 V to 8. OV, which is wider than the display gradation voltage range.
  • the display gradation number (64) and the display gradation voltage range (2.5 V to 6.3 V) are not changed from T1 at low temperature (T2).
  • the parts of 5V (Vx) to 2.5V (VO,) and 6.3V (Vn,) to 8.OV (Vy) can be used for overshoot. Therefore, high contrast and high-speed response can be realized even at low temperatures, and moving picture display performance can be improved.
  • FIG. 5 is a graph showing another example of gradation-one gradation voltage conversion by the 8-bit DAC circuit 116.
  • the range of display gradation voltage corresponds to gradation voltage 0.5V (VO) power corresponding to 8 bits 0 gradation (6 bits 0 gradation) and 8 bits 255 gradation (6 bits 63 gradation).
  • the gradation voltage to be 8. OV (Vn).
  • the gradation voltage shown in the graph of FIG. 5 is applied to 64 gradations (corresponding to 6 bits 0 to 63 gradations) out of the 0 to 255 gradations input from the OS processing unit 14. Generated.
  • 6-bit 0 gradation is 8-bit representation 0 gradation
  • 6-bit 16 gradation is 8-bit representation 64 gradation
  • 6-bit 32 gradations are converted to 96 gradations in 8-bit expression
  • 48 gradations in 6 bits are converted to 192 gradations in 8-bit expression
  • 63 gradations in 6 bits are converted to 255 gradations in 8-bit expression.
  • the output voltage range is 0.5V to 8.OV, which is equal to the display gradation voltage range.
  • the display gradation voltage range corresponds to gradation voltage 2.5V (VO,) corresponding to 8 bits 64 gradations (6 bits 0 gradation) to 8 bits 188 gradations (6 bits 63 gradations).
  • the gradation voltage to be used is 6.3V (Vn,). Then, the gradation voltage as shown in the graph of FIG. 5 is applied to 64 gradations (corresponding to 6 bits 0 to 63 gradations) out of 64 to 192 gradations to which the OS processing unit 14 power is also input.
  • T 2 [Koo! Take 0 to 64 gradations (corresponding to 0.5 to 2.5 V (not including 2.5 V)) and 192 to 255 gradations 6.3 to 8 0V (not including 6.3V) is input to the 8-bit DAC circuit 116 as the OS gradation (for example, if the previous frame is 190 gradations and the current frame is 96 gradations at T2, the OS 40 gradations are input to the 8-bit DAC circuit 116).
  • the output voltage range is 0.5V to 8.0V, which is wider than the display gradation voltage range.
  • the number of display gradations (64) does not change from T1 (room temperature) from 0.5V (Vx) to 2.5V (VO,) and 6 3V (Vn,) to 8. OV (Vy) can be used for overshoot. Accordingly, high contrast and high-speed response can be realized even at low temperatures, and moving image display performance can be improved.
  • the cut amount under T1 (room temperature) can be reduced to 0 or less, the display gradation voltage range at T1 can be widened (0.5 to 8. OV), and the contrast can be improved. it can.
  • the OS processing unit 14 may perform processing as shown in FIG. 7 or FIG. Figures 7 and 8 show the case where the frame rate is set to 20 [Hz] (2 frames out of 3 frames are thinned out). As shown in Fig. 8, the response speed can be maximized by gradually decreasing the OS gradation from the first frame to the third frame. In addition, as shown in FIG. 7, if the OS gradation is constant over the first to third frames, the appearance of the video can be improved.
  • the display device drive device of the present invention is suitable for a display device mounted on a steerable moving body such as a vehicle, for example.

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Abstract

Selon l'invention, dans un appareil de pilotage d'un panneau à cristaux liquides, lorsque les échelles de gris, indiquées par des données d'entrée, sont de zéro à n échelles de gris, une plage de tensions de référence à une température T1 est réglée de Vmin à Vmax et une plage de tensions de référence à une température T2, inférieure à la température T1, est réglée de Vmin' à Vmax' (où Vmin' < Vmin et Vmax' > Vmax). À la température T1, aucune conversion d'échelle de gris n'est effectuée et les zéro à n échelles de gris sont utilisées comme échelles de gris d'affichage. À la température T2, les conversions d'échelles de gris sont effectuées et de i à j échelles de gris sont utilisées comme échelles de gris d'affichage (où 0 < i < j < n). En outre, les tensions d'échelles de gris correspondant aux i à j échelles de gris sont réglées de Vi' à Vj' (où Vmin' < Vi' < Vj' < Vmax') et, à la température T2, les plages de Vmin' à Vi' et de Vj' à Vmax' sont utilisées dans un procédé d'accentuation de transitions d'échelles de gris. De cette manière, on peut améliorer les performances d'affichage d'images mobiles à de faibles températures.
PCT/JP2006/318076 2005-12-26 2006-09-12 Appareil de pilotage de dispositif d'affichage, procédé de pilotage de dispositif d'affichage et dispositif d'affichage WO2007074560A1 (fr)

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Cited By (5)

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JP2009020340A (ja) * 2007-07-12 2009-01-29 Renesas Technology Corp 表示装置及び表示装置駆動回路
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