WO2019189028A1 - Display control device and display control method - Google Patents

Display control device and display control method Download PDF

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Publication number
WO2019189028A1
WO2019189028A1 PCT/JP2019/012595 JP2019012595W WO2019189028A1 WO 2019189028 A1 WO2019189028 A1 WO 2019189028A1 JP 2019012595 W JP2019012595 W JP 2019012595W WO 2019189028 A1 WO2019189028 A1 WO 2019189028A1
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WIPO (PCT)
Prior art keywords
display
unit
pwm
backlight
display control
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PCT/JP2019/012595
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French (fr)
Japanese (ja)
Inventor
大亮 伊藤
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パナソニックＩｐマネジメント株式会社
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Publication of WO2019189028A1 publication Critical patent/WO2019189028A1/en

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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • 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
    • 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
    • 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

Definitions

  • the present disclosure relates to display control technology, and more particularly to a display control device and a display control method for controlling display on a display device.
  • liquid crystal display devices have been used in a wide range of fields such as mobile terminals, smartphones, in-vehicle devices, television receivers, and monitors for personal computers. Many techniques for realizing a more beautiful display with less power consumption have been proposed.
  • Patent Document 1 discloses a technique for shortening the time until luminance and chromaticity are stabilized due to a temperature change.
  • Patent Document 2 in a liquid crystal display device equipped with an LED backlight light source, when controlling the start-up according to the image quality by combining the PWM method and the current value control method, the power consumption for lighting the LED is described. Techniques for reducing are disclosed.
  • Patent Document 3 discloses a technique for suppressing the color change of the liquid crystal panel screen and improving the image quality when the driving current of the LED backlight is changed.
  • the present inventor has recognized that a technique for improving the color gamut and color reproducibility of a liquid crystal display device is necessary to realize a more beautiful display, and has come up with the technique of the present disclosure.
  • This disclosure provides a technique for improving the color gamut and color reproducibility of a display device.
  • a display control device on a touch panel including a backlight including phosphors of a plurality of colors having different response speeds, a plurality of display elements, and a plurality of sensor elements.
  • a display drive control unit that applies a drive voltage to a plurality of display elements, an input unit that inputs detection signals from the plurality of sensor elements, and a detection unit that detects the frequency and intensity of noise from the detection signals input by the input unit; And an adjustment unit that adjusts the drive voltage applied to the plurality of display elements by the display drive control unit based on the frequency and intensity of the noise detected by the detection unit.
  • This display control apparatus is configured to adjust the luminance of a backlight of a touch panel including a backlight having a plurality of phosphors having different response speeds, a plurality of display elements, and a plurality of sensor elements.
  • a PWM control unit that controls the lighting period of the backlight by the PWM method so that the lighting period becomes a length according to the luminance of the backlight, and controls on / off of the backlight according to the lighting period controlled by the PWM control unit
  • a backlight control unit a display drive control unit that applies a drive voltage to a plurality of display elements, an input unit that inputs detection signals from the plurality of sensor elements, and the frequency and intensity of noise from the detection signals input by the input units
  • a display drive control unit having a plurality of display elements based on the frequency and intensity of noise detected by the detection unit.
  • a adjusting unit that adjusts the driving voltage applied to.
  • the display control method includes a step of applying a driving voltage to a plurality of display elements of a touch panel including a backlight including phosphors of a plurality of colors having different response speeds, a plurality of display elements, and a plurality of sensor elements; A step of inputting detection signals from a plurality of sensor elements, a step of detecting the frequency and intensity of noise from the input detection signals, and a drive applied to the plurality of display elements based on the detected frequency and intensity of noise. Adjusting the voltage.
  • FIG. 1 shows a configuration of a display control apparatus according to the embodiment.
  • the display control apparatus inputs touch information on the touch panel 10 and generates a display image to be displayed on the touch panel 10, and a TDDI (Touch and Display Driver) Integration) 20 that controls driving of the touch panel 10.
  • TDDI 20 is a touch controller IC and display driver IC that are separately mounted on a single chip, and functions as a display control device for driving the display element 12 of the liquid crystal display device of the touch panel 10. It also functions as an input control device for detecting contact with a user's finger or the like from signals detected by the ten sensor elements 13.
  • the touch panel 10 of the present embodiment uses an LED using an RG phosphor as the backlight 11 of the liquid crystal display device.
  • the R (red) phosphor may be, for example, KSF, CASN, or SCASN
  • the G (green) phosphor may be, for example, CSO, GYAG, ⁇ -SiAlON, or the like.
  • FIG. 2 shows an example of response speeds of the R phosphor and the G phosphor.
  • the response speed may be different for each phosphor. For example, as shown in FIG. 2, when the response speed of the R phosphor is slower than the response speed of the G phosphor, immediately after the backlight 11 is turned off, the fluorescence of the R phosphor remains and the display screen of the liquid crystal display device The whole turns red for a moment.
  • the backlight 11 of the touch panel 10 is adjusted by a pulse width modulation (PWM) method
  • PWM pulse width modulation
  • FIG. 3 is a two-color diagram showing an example of display colors when the backlight 11 is dimmed by the PWM method.
  • the duty ratio of PWM 100%, that is, the display color is white for the entire period, the display color is white.
  • the influence of red afterglow increases and the display color shifts to red.
  • the color gamut can be expanded by using the RG phosphor, but on the other hand, the display color displayed on the touch panel 10 of the display image generated by the host device 30 is caused by the characteristics of the RG phosphor. There arises a new problem of shifting in the red direction from the display color. Therefore, in order to improve the color reproducibility of the liquid crystal display device, it is necessary to correct the chromaticity deviation.
  • the present embodiment it is detected whether or not PWM driving is in progress.
  • PWM driving the luminance of the display element 12 having a slower response speed is selected. By adjusting it low, the chromaticity shift is corrected. As a result, the color gamut can be expanded while maintaining good color reproducibility.
  • the host device 30 includes an input interface 31, an application 32, a display signal generation unit 33, a display signal output unit 34, a luminance setting unit 35, a PWM control unit 36, and an LED driver 37.
  • the input interface 31 receives input signals from input devices such as the touch panel 10, buttons, and a mouse.
  • the application 32 executes a predetermined function according to an instruction from the user input through the input interface 31 and generates a display image to be displayed on the liquid crystal display device of the touch panel 10.
  • the display signal generation unit 33 generates a display signal for displaying the display image generated by the application 32 on the liquid crystal display device of the touch panel 10.
  • the display signal may be, for example, a signal indicating gradation for each RGB.
  • the display signal output unit 34 outputs the display signal generated by the display signal generation unit 33 to the TDDI 20.
  • the brightness setting unit 35 sets the brightness (brightness) of the touch panel 10 according to an instruction from the user input through the input interface 31.
  • the PWM control unit 36 sets a PWM duty ratio for adjusting the luminance of the backlight 11 according to the luminance set by the luminance setting unit 35, and outputs an ON duty PWM signal according to the set duty ratio. Generate.
  • the LED driver 37 generates a voltage for driving the LEDs constituting the backlight 11 according to the PWM signal generated by the PWM control unit 36 and outputs the voltage to the backlight 11.
  • the TDDI 20 includes a display drive control unit 21, a touch drive control unit 22, a touch detection unit 23, a PWM noise detection unit 24, and a white balance adjustment unit 25.
  • the display drive control unit 21 applies a drive voltage corresponding to the gradation to each of the plurality of display elements 12 of the touch panel 10 in accordance with a display signal input from the host device 30.
  • the touch drive control unit 22 functions as an input unit that inputs detection signals at a predetermined drive frequency from each of the plurality of sensor elements 13 of the touch panel 10. For example, in the case of the capacitive touch panel 10, the touch drive control unit 22 inputs a detection signal indicating the capacitance between the electrodes.
  • the TDDI 20 executes the PWM control for adjusting the brightness of the backlight 11 of the touch panel 10, the TDDI 20 itself can grasp whether or not the PWM drive is in progress, but as in the present embodiment.
  • the host device 30 mounted as a circuit different from the TDDI 20 executes the PWM control, the TDDI 20 cannot directly determine whether or not the PWM drive is being performed. Even in this case, if the host device 30 is configured to notify the TDDI 20 whether or not PWM driving is in progress, it can be determined whether or not the TDDI 20 is PWM driving. In this embodiment, a technique for determining whether PWM driving is being performed from a noise signal detected by the sensor element 13 is proposed.
  • the touch panel 10 including the backlight 11 using the RG phosphor is connected to the host device 30 that does not have the function of notifying the TDDI 20 whether or not the PWM driving is being performed, the color is appropriately set.
  • the degree deviation can be corrected. Further, since it is not necessary to provide a special external element for correcting the chromaticity, the manufacturing cost and size of the display control device can be suppressed.
  • the touch drive control unit 22 scans and detects the sensor element 13 at a drive frequency of, for example, about 100 kHz in order to detect the contact position accurately for a while after detecting contact in any of the sensor elements 13.
  • a signal is intermittently input from the sensor element 13 at a predetermined interval in order to confirm the presence or absence of the contact.
  • the former is called “driving period” and the latter is called “idle period”.
  • the touch drive control unit 22 inputs the detection signal from the sensor element 13 at a predetermined timing when the input of the detection signal for detecting contact is not executed during the idle period.
  • the PWM noise detection unit 24 detects noise caused by PWM drive from the detection signal input from the sensor element 13.
  • the PWM noise detection unit 24 converts the input detection signal into a frequency domain by Fourier transform, calculates the frequency and intensity of the detection signal, and the noise intensity in the PWM drive frequency range is equal to or greater than a predetermined threshold Then, it is determined that the PWM drive is in progress.
  • the PWM noise detection unit 24 is preset with a PWM driving frequency range that is executed in backlight luminance adjustment of a general liquid crystal display device.
  • the touch drive control unit 22 receives a detection signal from the sensor element 13 at the same frequency as the PWM drive frequency, measures the noise intensity of the PWM drive frequency, and the PWM noise detection unit 24 performs the PWM drive.
  • the touch drive control unit 22 is preset with a PWM drive frequency range executed in backlight luminance adjustment of a general liquid crystal display device, and is set in a predetermined period in the idle period.
  • a detection signal is input from the sensor element 13 at a frequency in the range.
  • the PWM noise detection unit 24 may detect the noise intensity of the PWM drive frequency by any method other than the above.
  • the white balance adjustment unit 25 is applied by the display drive control unit 21 to the display element 12 in order to reduce the deviation of the chromaticity in the red direction when noise caused by the PWM drive is detected by the PWM noise detection unit 24. Adjust the voltage. Specifically, the white balance adjustment unit 25 sets the maximum value of the voltage applied to the red display element 12 to be lower than the maximum value of the voltage applied to the blue and green display elements 12. For example, when the white balance adjustment unit 25 is not in PWM driving, the maximum values of the voltages applied to the red, blue, and green display elements 12 are all set to 5.5 V, while when PWM driving is in progress. Changes the maximum value of the voltage applied to the red display element 12 to 5.0 V, and lowers the maximum value of the voltage applied to the blue and green display elements 12 to 5.5 V.
  • the display drive control unit 21 uses the maximum value of the voltage set by the white balance adjustment unit 25 as the maximum gradation voltage value, and the maximum gradation voltage according to the gradation of the display signal input by the host device 30. A voltage value divided between the value and 0 is applied to the display element 12. As a result, the luminance of the red display element 12 can be corrected to be low by the amount of afterglow of the R phosphor, so that the chromaticity shift due to PWM driving in the red direction is reduced, and color reproducibility is improved. Can be improved.
  • the maximum value of the voltage applied to the display element 12 of the phosphor color (red in the present embodiment) having a slower response speed is applied to the display elements 12 of other colors (blue and green in the present embodiment).
  • the applied voltage is lower than the maximum value of the voltage to be applied, the voltage applied to the display element 12 of the phosphor color (blue and green in the present embodiment) having a faster response speed during PWM driving.
  • the maximum value may be set higher than when the PWM drive is not being performed.
  • FIG. 4 is a flowchart showing the procedure of the display control method according to the embodiment.
  • step S10 when it is a touch drive period (step S10, YES), the touch drive control unit 22 inputs a detection signal from the sensor element 13 at the drive frequency, and the touch detection unit 23 is based on the input detection signal. However, the PWM noise detection unit 24 does not detect noise.
  • step S12 the touch drive control unit 22 inputs a detection signal from the sensor element 13 at a predetermined timing, and the PWM noise detection unit 24 inputs The frequency and intensity of noise are calculated by Fourier transforming the detected signal.
  • step S14 the white balance adjustment unit 25 applies the red display element 12 with a slower response speed of the phosphor.
  • the display drive control unit 21 is instructed to lower the maximum value of the voltage to be applied.
  • step S12 when the noise intensity in the PWM drive frequency range is less than the predetermined threshold (step S12, NO), the white balance adjustment unit 25 returns to step S10 without adjusting the maximum value of the voltage.
  • PWM noise is not detected during the drive period, but in another example, PWM noise may be detected during the drive period.
  • the PWM noise detection unit 24 Fourier-transforms a detection signal of a region where no contact is detected among the detection signals of the sensor element 13 input by the touch drive control unit 22 at a predetermined timing, thereby generating a noise frequency. And the intensity may be calculated. Thereby, even when the touch panel 10 is operated, the chromaticity shift can be appropriately corrected, and the color reproducibility can be improved.
  • the PWM noise detection unit 24 estimates the PWM duty ratio from the noise frequency and intensity calculated by Fourier transform, and the white balance adjustment unit 25 responds to the PWM duty ratio estimated by the PWM noise detection unit 24.
  • the maximum value of the voltage applied to the display element 12 may be adjusted. As shown in FIG. 3, the smaller the duty ratio, the greater the shift to red, so the maximum value of the voltage applied to the red display element 12 may be made smaller. Thereby, chromaticity can be corrected more appropriately and color reproducibility can be improved.
  • a display control device provides a driving voltage to a plurality of display elements of a touch panel including a backlight including a plurality of colors of phosphors having different response speeds, a plurality of display elements, and a plurality of sensor elements.
  • a display drive control unit to be applied, an input unit for inputting detection signals from a plurality of sensor elements, a detection unit for detecting the frequency and intensity of noise from the detection signals input by the input unit, and the noise detected by the detection unit
  • an adjustment unit that adjusts the drive voltage applied to the plurality of display elements by the display drive control unit based on the frequency and intensity of the display.
  • the color gamut can be improved while keeping the color reproducibility of the display device high.
  • the adjusting unit is driven when the noise intensity of a predetermined range including a pulse width modulation (PWM) frequency for adjusting the luminance of the backlight detected by the detecting unit is equal to or higher than a predetermined threshold.
  • the voltage may be adjusted. According to this aspect, it is possible to appropriately detect that the PWM drive is being performed, and to appropriately correct the chromaticity shift caused by the PWM drive. Therefore, it is possible to improve color reproducibility.
  • PWM pulse width modulation
  • the adjusting unit may adjust the voltage applied to the phosphor display device having a slower response speed to a low voltage. According to this aspect, it is possible to reduce the influence of phosphor afterglow caused by PWM driving, so that color reproducibility can be improved.
  • This display control apparatus is configured to adjust the luminance of a backlight of a touch panel including a backlight having a plurality of phosphors having different response speeds, a plurality of display elements, and a plurality of sensor elements.
  • a PWM control unit that controls the lighting period of the backlight by the PWM method so that the lighting period becomes a length according to the luminance of the backlight, and controls on / off of the backlight according to the lighting period controlled by the PWM control unit
  • a backlight control unit a display drive control unit that applies a drive voltage to a plurality of display elements, an input unit that inputs detection signals from the plurality of sensor elements, and the frequency and intensity of noise from the detection signals input by the input units
  • a display drive control unit having a plurality of display elements based on the frequency and intensity of noise detected by the detection unit.
  • a adjusting unit that adjusts the driving voltage applied to.
  • the color gamut can be improved while keeping the color reproducibility of the display device high.
  • the adjustment unit may adjust the drive voltage when the intensity of noise in a predetermined range including the PWM frequency controlled by the PWM control unit detected by the detection unit is equal to or greater than a predetermined threshold. According to this aspect, it is possible to appropriately detect that the PWM drive is being performed, and to appropriately correct the chromaticity shift caused by the PWM drive. Therefore, it is possible to improve color reproducibility.
  • the adjusting unit may adjust the voltage applied to the phosphor display device having a slower response speed to a low voltage. According to this aspect, it is possible to reduce the influence of phosphor afterglow caused by PWM driving, so that color reproducibility can be improved.
  • the PWM control unit and the backlight control unit, the display drive control unit, the input unit, the detection unit, and the adjustment unit may be mounted on different circuits. Even if the adjustment unit cannot directly know whether or not the PWM control unit is in the PWM drive, the detection unit can accurately detect whether or not the PWM drive is in progress. Since the influence of phosphor afterglow caused by the above can be reduced, color reproducibility can be improved.
  • Still another aspect of the present invention is a display control method.
  • the method includes applying a driving voltage to a plurality of display elements of a touch panel including a backlight having a plurality of phosphors having different response speeds, a plurality of display elements, and a plurality of sensor elements; A step of inputting a detection signal from the sensor element, a step of detecting a frequency and intensity of noise from the input detection signal, and a drive voltage applied to the plurality of display elements based on the detected frequency and intensity of noise. Adjusting.
  • the color gamut can be improved while keeping the color reproducibility of the display device high.
  • the adjusting step adjusts the drive voltage when the intensity of noise in a predetermined range including the PWM frequency for adjusting the luminance of the backlight detected in the detecting step is equal to or higher than a predetermined threshold. May be. According to this aspect, it is possible to appropriately detect that the PWM drive is being performed, and to appropriately correct the chromaticity shift caused by the PWM drive. Therefore, it is possible to improve color reproducibility.
  • the adjusting step may adjust the voltage applied to the phosphor color display element having a slower response speed. According to this aspect, it is possible to reduce the influence of phosphor afterglow caused by PWM driving, so that color reproducibility can be improved.
  • the present disclosure can be used for a display control device that controls display on a display device.

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Abstract

A TDDI (20) that is an example of a display control device is provided with: a display drive control unit (21) which applies drive voltage to a plurality of display elements (12) of a touch panel (10) which is provided with a backlight (11) provided with phosphors of a plurality of colors having different response speeds, the plurality of display elements (12), and a plurality of sensor elements (13); a touch drive control unit (22) that is an example of an input unit to which sensing signals are inputted from the plurality of sensor elements (13); a PWM noise detection unit (24) which detects the frequency and intensity of noise from the sensing signals inputted by the touch drive control unit (22); and a white balance adjustment unit (25) which, on the basis of the frequency and intensity of the noise detected by the PWM noise detection unit (24), adjusts the drive voltage to be applied to the plurality of display elements by the display drive control unit (21).

Description

表示制御装置及び表示制御方法Display control apparatus and display control method
　本開示は、表示制御技術に関し、特に表示装置への表示を制御する表示制御装置及び表示制御方法に関する。 The present disclosure relates to display control technology, and more particularly to a display control device and a display control method for controlling display on a display device.
　近年、携帯端末、スマートフォン、車載機、テレビジョン受像機、パーソナルコンピュータのモニタなど、広範な分野において液晶表示装置が利用されている。より少ない消費電力でより美しい表示を実現するための技術が多数提案されている。 In recent years, liquid crystal display devices have been used in a wide range of fields such as mobile terminals, smartphones, in-vehicle devices, television receivers, and monitors for personal computers. Many techniques for realizing a more beautiful display with less power consumption have been proposed.
　例えば、特許文献１には、温度変化による輝度および色度が安定するまでの時間を短縮する技術が開示されている。 For example, Patent Document 1 discloses a technique for shortening the time until luminance and chromaticity are stabilized due to a temperature change.
　また、特許文献２には、ＬＥＤのバックライト光源を備えた液晶表示装置において、ＰＷＭ方式と電流値制御方式とを組み合わせて画質に応じた起動に制御するに際し、ＬＥＤの点灯にかかる消費電力を低減する技術が開示されている。 Further, in Patent Document 2, in a liquid crystal display device equipped with an LED backlight light source, when controlling the start-up according to the image quality by combining the PWM method and the current value control method, the power consumption for lighting the LED is described. Techniques for reducing are disclosed.
　また、特許文献３には、ＬＥＤのバックライトの駆動電流を変化させたときに液晶パネル画面の色変化を抑え、映像品位を向上させる技術が開示されている。 Further, Patent Document 3 discloses a technique for suppressing the color change of the liquid crystal panel screen and improving the image quality when the driving current of the LED backlight is changed.
特開２００６－２７６７２５号公報JP 2006-276725 A 特開２０１１－０３４０７１号公報JP 2011-034071 A 特開２０１１－０８５６９３号公報JP 2011-085693 A
　本発明者は、より美しい表示を実現するために、液晶表示装置の色域及び色再現性を向上させる技術が必要であることを課題として認識し、本開示の技術に想到した。 The present inventor has recognized that a technique for improving the color gamut and color reproducibility of a liquid crystal display device is necessary to realize a more beautiful display, and has come up with the technique of the present disclosure.
　本開示は、表示装置の色域及び色再現性を向上させる技術を提供する。 This disclosure provides a technique for improving the color gamut and color reproducibility of a display device.
　上記課題を解決するために、本開示のある態様の表示制御装置は、応答速度の異なる複数の色の蛍光体を備えるバックライトと、複数の表示素子と、複数のセンサ素子とを備えるタッチパネルの複数の表示素子に駆動電圧を印加する表示駆動制御部と、複数のセンサ素子から検知信号を入力する入力部と、入力部により入力された検知信号からノイズの周波数及び強度を検出する検出部と、検出部により検出されたノイズの周波数及び強度に基づいて、表示駆動制御部が複数の表示素子に印加する駆動電圧を調整する調整部と、を備える。 In order to solve the above problems, a display control device according to an aspect of the present disclosure is provided on a touch panel including a backlight including phosphors of a plurality of colors having different response speeds, a plurality of display elements, and a plurality of sensor elements. A display drive control unit that applies a drive voltage to a plurality of display elements, an input unit that inputs detection signals from the plurality of sensor elements, and a detection unit that detects the frequency and intensity of noise from the detection signals input by the input unit; And an adjustment unit that adjusts the drive voltage applied to the plurality of display elements by the display drive control unit based on the frequency and intensity of the noise detected by the detection unit.
　本開示の別の態様もまた、表示制御装置である。この表示制御装置は、応答速度の異なる複数の色の蛍光体を備えるバックライトと、複数の表示素子と、複数のセンサ素子とを備えるタッチパネルのバックライトの輝度を調整するために、バックライトの点灯期間がバックライトの輝度に応じた長さとなるように、バックライトの点灯期間をＰＷＭ方式により制御するＰＷＭ制御部と、ＰＷＭ制御部により制御される点灯期間にしたがってバックライトのオンオフを制御するバックライト制御部と、複数の表示素子に駆動電圧を印加する表示駆動制御部と、複数のセンサ素子から検知信号を入力する入力部と、入力部により入力された検知信号からノイズの周波数及び強度を検出する検出部と、検出部により検出されたノイズの周波数及び強度に基づいて、表示駆動制御部が複数の表示素子に印加する駆動電圧を調整する調整部と、を備える。 Another aspect of the present disclosure is also a display control device. This display control apparatus is configured to adjust the luminance of a backlight of a touch panel including a backlight having a plurality of phosphors having different response speeds, a plurality of display elements, and a plurality of sensor elements. A PWM control unit that controls the lighting period of the backlight by the PWM method so that the lighting period becomes a length according to the luminance of the backlight, and controls on / off of the backlight according to the lighting period controlled by the PWM control unit A backlight control unit, a display drive control unit that applies a drive voltage to a plurality of display elements, an input unit that inputs detection signals from the plurality of sensor elements, and the frequency and intensity of noise from the detection signals input by the input units And a display drive control unit having a plurality of display elements based on the frequency and intensity of noise detected by the detection unit. And a adjusting unit that adjusts the driving voltage applied to.
　本開示のさらに別の態様は、表示制御方法である。この表示制御方法は、応答速度の異なる複数の色の蛍光体を備えるバックライトと、複数の表示素子と、複数のセンサ素子とを備えるタッチパネルの複数の表示素子に駆動電圧を印加するステップと、複数のセンサ素子から検知信号を入力するステップと、入力された検知信号からノイズの周波数及び強度を検出するステップと、検出されたノイズの周波数及び強度に基づいて、複数の表示素子に印加する駆動電圧を調整するステップと、を備える。 Still another aspect of the present disclosure is a display control method. The display control method includes a step of applying a driving voltage to a plurality of display elements of a touch panel including a backlight including phosphors of a plurality of colors having different response speeds, a plurality of display elements, and a plurality of sensor elements; A step of inputting detection signals from a plurality of sensor elements, a step of detecting the frequency and intensity of noise from the input detection signals, and a drive applied to the plurality of display elements based on the detected frequency and intensity of noise. Adjusting the voltage.
　なお、以上の構成要素の任意の組合せ、本開示の表現を方法、装置、システム、記録媒体、コンピュータプログラムなどの間で変換したものもまた、本開示の態様として有効である。 It should be noted that any combination of the above-described constituent elements and a representation of the present disclosure converted between a method, an apparatus, a system, a recording medium, a computer program, etc. are also effective as an aspect of the present disclosure.
　本開示によれば、表示装置の色域及び色再現性を向上させることができる。 According to the present disclosure, it is possible to improve the color gamut and color reproducibility of the display device.
実施の形態に係る表示制御装置の構成を示す図である。It is a figure which shows the structure of the display control apparatus which concerns on embodiment. Ｒ蛍光体とＧ蛍光体の応答速度の例を示す図である。It is a figure which shows the example of the response speed of R fluorescent substance and G fluorescent substance. ＰＷＭ方式によりバックライトを調光した場合の表示色の例を示す二色図である。It is a dichroic diagram showing an example of display colors when the backlight is dimmed by the PWM method. 実施の形態に係る表示制御方法の手順を示すフローチャートである。It is a flowchart which shows the procedure of the display control method which concerns on embodiment.
　図１は、実施の形態に係る表示制御装置の構成を示す。本実施の形態の表示制御装置は、タッチパネル１０に対するタッチ情報を入力し、タッチパネル１０に表示する表示画像を生成するホスト装置３０と、タッチパネル１０の駆動を制御するＴＤＤＩ（Touch and Display Driver Integration）２０を備える。ＴＤＤＩ２０は、従来別々に実装されていたタッチコントローラＩＣとディスプレードライバＩＣを１チップ化したものであり、タッチパネル１０の液晶表示装置の表示素子１２を駆動するための表示制御装置として機能するとともに、タッチパネル１０のセンサ素子１３により検知された信号からユーザの指などによる接触を検出するための入力制御装置としても機能する。 FIG. 1 shows a configuration of a display control apparatus according to the embodiment. The display control apparatus according to the present embodiment inputs touch information on the touch panel 10 and generates a display image to be displayed on the touch panel 10, and a TDDI (Touch and Display Driver） Integration) 20 that controls driving of the touch panel 10. Is provided. The TDDI 20 is a touch controller IC and display driver IC that are separately mounted on a single chip, and functions as a display control device for driving the display element 12 of the liquid crystal display device of the touch panel 10. It also functions as an input control device for detecting contact with a user's finger or the like from signals detected by the ten sensor elements 13.
　本実施の形態のタッチパネル１０は、ＲＧ蛍光体を用いたＬＥＤを液晶表示装置のバックライト１１として用いる。これにより、タッチパネル１０の液晶表示装置の色域を拡大し、良好な色再現性を実現することができる。Ｒ（赤）蛍光体は、例えば、ＫＳＦ、ＣＡＳＮ、ＳＣＡＳＮなどであってもよく、Ｇ（緑）蛍光体は、例えば、ＣＳＯ、ＧＹＡＧ、β－ＳｉＡｌＯＮなどであってもよい。 The touch panel 10 of the present embodiment uses an LED using an RG phosphor as the backlight 11 of the liquid crystal display device. Thereby, the color gamut of the liquid crystal display device of the touch panel 10 can be expanded, and good color reproducibility can be realized. The R (red) phosphor may be, for example, KSF, CASN, or SCASN, and the G (green) phosphor may be, for example, CSO, GYAG, β-SiAlON, or the like.
　図２は、Ｒ蛍光体とＧ蛍光体の応答速度の例を示す。本実施の形態のように、異なる複数の蛍光体を用いたＬＥＤをバックライト１１として用いる場合、蛍光体ごとに応答速度が異なることが問題となりうる。例えば、図２に示すように、Ｒ蛍光体の応答速度がＧ蛍光体の応答速度よりも遅い場合、バックライト１１を消灯した直後に、Ｒ蛍光体の蛍光が残って液晶表示装置の表示画面全体が一瞬赤色化する。とくに、タッチパネル１０のバックライト１１の輝度をパルス幅変調（ＰＷＭ）方式により調整する場合、バックライト１１のオンオフが高速に繰り返されるため、Ｒ蛍光体の残光の影響により色度が赤色方向にシフトしてしまう。 FIG. 2 shows an example of response speeds of the R phosphor and the G phosphor. When an LED using a plurality of different phosphors is used as the backlight 11 as in the present embodiment, the response speed may be different for each phosphor. For example, as shown in FIG. 2, when the response speed of the R phosphor is slower than the response speed of the G phosphor, immediately after the backlight 11 is turned off, the fluorescence of the R phosphor remains and the display screen of the liquid crystal display device The whole turns red for a moment. In particular, when the luminance of the backlight 11 of the touch panel 10 is adjusted by a pulse width modulation (PWM) method, the backlight 11 is repeatedly turned on and off at high speed, so that the chromaticity is in the red direction due to the influence of the afterglow of the R phosphor. It will shift.
　図３は、ＰＷＭ方式によりバックライト１１を調光した場合の表示色の例を示す二色図である。ＰＷＭのデューティー比が１００％、すなわち、全期間オンのままである場合の表示色は白色であるが、デューティー比を小さくするにつれて、赤色の残光の影響が大きくなり、表示色が赤色にシフトしているのが分かる。 FIG. 3 is a two-color diagram showing an example of display colors when the backlight 11 is dimmed by the PWM method. When the duty ratio of PWM is 100%, that is, the display color is white for the entire period, the display color is white. However, as the duty ratio is reduced, the influence of red afterglow increases and the display color shifts to red. You can see that
　このように、ＲＧ蛍光体を用いることにより色域を拡大させることができるが、他方で、ＲＧ蛍光体の特性により、タッチパネル１０に表示される表示色がホスト装置３０により生成された表示画像の表示色よりも赤色方向にずれるという新たな課題が生じる。したがって、液晶表示装置の色再現性を向上させるためには、色度のずれを補正する必要がある。 In this way, the color gamut can be expanded by using the RG phosphor, but on the other hand, the display color displayed on the touch panel 10 of the display image generated by the host device 30 is caused by the characteristics of the RG phosphor. There arises a new problem of shifting in the red direction from the display color. Therefore, in order to improve the color reproducibility of the liquid crystal display device, it is necessary to correct the chromaticity deviation.
　このような課題を解決するために、本実施の形態では、ＰＷＭ駆動中であるか否かを検出し、ＰＷＭ駆動中には、応答速度のより遅い蛍光体の色の表示素子１２の輝度を低く調整することにより、色度のずれを補正する。これにより、色再現性を良好に保ちつつ、色域を拡大することができる。 In order to solve such a problem, in the present embodiment, it is detected whether or not PWM driving is in progress. During PWM driving, the luminance of the display element 12 having a slower response speed is selected. By adjusting it low, the chromaticity shift is corrected. As a result, the color gamut can be expanded while maintaining good color reproducibility.
　図１に戻り、各構成について説明する。ホスト装置３０は、入力インタフェース３１、アプリケーション３２、表示信号生成部３３、表示信号出力部３４、輝度設定部３５、ＰＷＭ制御部３６、及びＬＥＤドライバ３７を備える。 Referring back to FIG. 1, each configuration will be described. The host device 30 includes an input interface 31, an application 32, a display signal generation unit 33, a display signal output unit 34, a luminance setting unit 35, a PWM control unit 36, and an LED driver 37.
　入力インタフェース３１は、タッチパネル１０、ボタン、マウスなどの入力装置からの入力信号を受信する。アプリケーション３２は、入力インタフェース３１により入力されたユーザからの指示などに応じて所定の機能を実行し、タッチパネル１０の液晶表示装置に表示する表示画像を生成する。表示信号生成部３３は、アプリケーション３２により生成された表示画像をタッチパネル１０の液晶表示装置に表示するための表示信号を生成する。表示信号は、例えば、ＲＧＢごとの階調を示す信号であってもよい。表示信号出力部３４は、表示信号生成部３３により生成された表示信号をＴＤＤＩ２０に出力する。 The input interface 31 receives input signals from input devices such as the touch panel 10, buttons, and a mouse. The application 32 executes a predetermined function according to an instruction from the user input through the input interface 31 and generates a display image to be displayed on the liquid crystal display device of the touch panel 10. The display signal generation unit 33 generates a display signal for displaying the display image generated by the application 32 on the liquid crystal display device of the touch panel 10. The display signal may be, for example, a signal indicating gradation for each RGB. The display signal output unit 34 outputs the display signal generated by the display signal generation unit 33 to the TDDI 20.
　輝度設定部３５は、入力インタフェース３１により入力されたユーザからの指示などに応じてタッチパネル１０の輝度（明るさ）を設定する。ＰＷＭ制御部３６は、輝度設定部３５により設定された輝度に応じて、バックライト１１の輝度を調整するためのＰＷＭのデューティー比を設定し、設定したデューティー比に応じてＯＮデューティーのＰＷＭ信号を生成する。ＬＥＤドライバ３７は、ＰＷＭ制御部３６により生成されたＰＷＭ信号にしたがって、バックライト１１を構成するＬＥＤを駆動するための電圧を生成し、バックライト１１に出力する。 The brightness setting unit 35 sets the brightness (brightness) of the touch panel 10 according to an instruction from the user input through the input interface 31. The PWM control unit 36 sets a PWM duty ratio for adjusting the luminance of the backlight 11 according to the luminance set by the luminance setting unit 35, and outputs an ON duty PWM signal according to the set duty ratio. Generate. The LED driver 37 generates a voltage for driving the LEDs constituting the backlight 11 according to the PWM signal generated by the PWM control unit 36 and outputs the voltage to the backlight 11.
　ＴＤＤＩ２０は、表示駆動制御部２１、タッチ駆動制御部２２、タッチ検出部２３、ＰＷＭノイズ検出部２４、及びホワイトバランス調整部２５を備える。 The TDDI 20 includes a display drive control unit 21, a touch drive control unit 22, a touch detection unit 23, a PWM noise detection unit 24, and a white balance adjustment unit 25.
　表示駆動制御部２１は、ホスト装置３０から入力される表示信号にしたがって、タッチパネル１０の複数の表示素子１２のそれぞれに、階調に応じた駆動電圧を印加する。タッチ駆動制御部２２は、タッチパネル１０の複数のセンサ素子１３のそれぞれから、所定の駆動周波数で検知信号を入力する入力部として機能する。例えば、静電容量方式のタッチパネル１０の場合、タッチ駆動制御部２２は、電極間の容量を示す検知信号を入力する。 The display drive control unit 21 applies a drive voltage corresponding to the gradation to each of the plurality of display elements 12 of the touch panel 10 in accordance with a display signal input from the host device 30. The touch drive control unit 22 functions as an input unit that inputs detection signals at a predetermined drive frequency from each of the plurality of sensor elements 13 of the touch panel 10. For example, in the case of the capacitive touch panel 10, the touch drive control unit 22 inputs a detection signal indicating the capacitance between the electrodes.
　タッチパネル１０のバックライト１１の輝度を調整するためのＰＷＭ制御をＴＤＤＩ２０が実行する場合には、ＰＷＭ駆動中であるか否かをＴＤＤＩ２０自身が把握することができるが、本実施の形態のように、ＴＤＤＩ２０とは別の回路として実装されるホスト装置３０がＰＷＭ制御を実行する場合には、ＴＤＤＩ２０は、ＰＷＭ駆動中であるか否かを直接把握することはできない。この場合であっても、ホスト装置３０からＴＤＤＩ２０にＰＷＭ駆動中であるか否かを通知するように構成すれば、ＴＤＤＩ２０はＰＷＭ駆動中であるか否かを把握することができるが、本実施の形態では、センサ素子１３により検知されるノイズ信号から、ＰＷＭ駆動中であるか否かを判定する技術を提案する。これにより、ＰＷＭ駆動中であるか否かをＴＤＤＩ２０に通知する機能を有しないホスト装置３０に、ＲＧ蛍光体を用いたバックライト１１を備えるタッチパネル１０を接続する場合であっても、適切に色度のずれを補正することができる。また、色度の補正のために特別な外部素子を設ける必要がないので、表示制御装置の製造コストやサイズなどを抑えることができる。 When the TDDI 20 executes the PWM control for adjusting the brightness of the backlight 11 of the touch panel 10, the TDDI 20 itself can grasp whether or not the PWM drive is in progress, but as in the present embodiment. When the host device 30 mounted as a circuit different from the TDDI 20 executes the PWM control, the TDDI 20 cannot directly determine whether or not the PWM drive is being performed. Even in this case, if the host device 30 is configured to notify the TDDI 20 whether or not PWM driving is in progress, it can be determined whether or not the TDDI 20 is PWM driving. In this embodiment, a technique for determining whether PWM driving is being performed from a noise signal detected by the sensor element 13 is proposed. Accordingly, even when the touch panel 10 including the backlight 11 using the RG phosphor is connected to the host device 30 that does not have the function of notifying the TDDI 20 whether or not the PWM driving is being performed, the color is appropriately set. The degree deviation can be corrected. Further, since it is not necessary to provide a special external element for correcting the chromaticity, the manufacturing cost and size of the display control device can be suppressed.
　タッチ駆動制御部２２は、いずれかのセンサ素子１３において接触を検出してからしばらくの間は、接触位置を精確に検出するために、例えば１００ｋＨｚ程度の駆動周波数でセンサ素子１３を走査して検知信号を入力するが、所定期間以上接触を検出しない場合は、接触の有無を確認するために、所定の間隔で間欠的にセンサ素子１３から信号を入力する。前者を「駆動期間」と呼び、後者を「アイドル期間」と呼ぶ。タッチ駆動制御部２２は、アイドル期間において、接触を検出するための検知信号の入力が実行されていない所定のタイミングでセンサ素子１３から検知信号を入力する。 The touch drive control unit 22 scans and detects the sensor element 13 at a drive frequency of, for example, about 100 kHz in order to detect the contact position accurately for a while after detecting contact in any of the sensor elements 13. When a signal is input but no contact is detected for a predetermined period, a signal is intermittently input from the sensor element 13 at a predetermined interval in order to confirm the presence or absence of the contact. The former is called “driving period” and the latter is called “idle period”. The touch drive control unit 22 inputs the detection signal from the sensor element 13 at a predetermined timing when the input of the detection signal for detecting contact is not executed during the idle period.
　ＰＷＭノイズ検出部２４は、センサ素子１３から入力された検知信号から、ＰＷＭ駆動に起因するノイズを検出する。ＰＷＭノイズ検出部２４は、入力された検知信号をフーリエ変換により周波数領域に変換して、検知信号の周波数及び強度を算出し、ＰＷＭ駆動周波数の範囲のノイズの強度が所定の閾値以上である場合に、ＰＷＭ駆動中であると判定する。ＰＷＭノイズ検出部２４には、一般的な液晶表示装置のバックライトの輝度調整において実行されているＰＷＭの駆動周波数の範囲が予め設定される。 The PWM noise detection unit 24 detects noise caused by PWM drive from the detection signal input from the sensor element 13. The PWM noise detection unit 24 converts the input detection signal into a frequency domain by Fourier transform, calculates the frequency and intensity of the detection signal, and the noise intensity in the PWM drive frequency range is equal to or greater than a predetermined threshold Then, it is determined that the PWM drive is in progress. The PWM noise detection unit 24 is preset with a PWM driving frequency range that is executed in backlight luminance adjustment of a general liquid crystal display device.
　別の例では、タッチ駆動制御部２２が、ＰＷＭの駆動周波数と同じ周波数でセンサ素子１３から検知信号を入力し、ＰＷＭ駆動周波数のノイズの強度を測定し、ＰＷＭノイズ検出部２４は、ＰＷＭ駆動周波数のノイズの強度が所定の閾値以上である場合に、ＰＷＭ駆動中であると判定する。この場合、タッチ駆動制御部２２には、一般的な液晶表示装置のバックライトの輝度調整において実行されているＰＷＭの駆動周波数の範囲が予め設定され、アイドル期間における所定の期間に、設定された範囲の周波数でセンサ素子１３から検知信号を入力する。ＰＷＭノイズ検出部２４は、上記以外の任意の方法でＰＷＭ駆動周波数のノイズの強度を検出してもよい。 In another example, the touch drive control unit 22 receives a detection signal from the sensor element 13 at the same frequency as the PWM drive frequency, measures the noise intensity of the PWM drive frequency, and the PWM noise detection unit 24 performs the PWM drive. When the frequency noise intensity is greater than or equal to a predetermined threshold, it is determined that PWM driving is in progress. In this case, the touch drive control unit 22 is preset with a PWM drive frequency range executed in backlight luminance adjustment of a general liquid crystal display device, and is set in a predetermined period in the idle period. A detection signal is input from the sensor element 13 at a frequency in the range. The PWM noise detection unit 24 may detect the noise intensity of the PWM drive frequency by any method other than the above.
　ホワイトバランス調整部２５は、ＰＷＭノイズ検出部２４によりＰＷＭ駆動に起因するノイズが検出された場合、色度の赤色方向へのずれを低減させるために、表示駆動制御部２１が表示素子１２に印加する電圧を調整する。具体的には、ホワイトバランス調整部２５は、赤色の表示素子１２に印加する電圧の最大値を、青色及び緑色の表示素子１２に印加する電圧の最大値よりも低く設定する。例えば、ホワイトバランス調整部２５は、ＰＷＭ駆動中でない場合には、赤色、青色、及び緑色の表示素子１２に印加する電圧の最大値を全て５．５Ｖとする一方、ＰＷＭ駆動中である場合には、赤色の表示素子１２に印加する電圧の最大値を５．０Ｖに変更し、青色及び緑色の表示素子１２に印加する電圧の最大値５．５Ｖよりも低くする。 The white balance adjustment unit 25 is applied by the display drive control unit 21 to the display element 12 in order to reduce the deviation of the chromaticity in the red direction when noise caused by the PWM drive is detected by the PWM noise detection unit 24. Adjust the voltage. Specifically, the white balance adjustment unit 25 sets the maximum value of the voltage applied to the red display element 12 to be lower than the maximum value of the voltage applied to the blue and green display elements 12. For example, when the white balance adjustment unit 25 is not in PWM driving, the maximum values of the voltages applied to the red, blue, and green display elements 12 are all set to 5.5 V, while when PWM driving is in progress. Changes the maximum value of the voltage applied to the red display element 12 to 5.0 V, and lowers the maximum value of the voltage applied to the blue and green display elements 12 to 5.5 V.
　表示駆動制御部２１は、ホワイトバランス調整部２５により設定された電圧の最大値を最大階調の電圧値とし、ホスト装置３０により入力された表示信号の階調に応じて、最大階調の電圧値と０の間で分割された電圧値を表示素子１２に印加する。これにより、赤色の表示素子１２の輝度を、Ｒ蛍光体の残光の分だけ低く補正することができるので、ＰＷＭ駆動に起因する色度の赤色方向へのずれを低減し、色再現性を向上させることができる。なお、より応答速度の遅い蛍光体の色（本実施の形態では赤）の表示素子１２に印加する電圧の最大値が、他の色（本実施の形態では青及び緑）の表示素子１２に印加する電圧の最大値よりも低くなっていればよいので、ＰＷＭ駆動中には、より応答速度の速い蛍光体の色（本実施の形態では青及び緑）の表示素子１２に印加する電圧の最大値を、ＰＷＭ駆動中でない場合よりも高く設定してもよい。 The display drive control unit 21 uses the maximum value of the voltage set by the white balance adjustment unit 25 as the maximum gradation voltage value, and the maximum gradation voltage according to the gradation of the display signal input by the host device 30. A voltage value divided between the value and 0 is applied to the display element 12. As a result, the luminance of the red display element 12 can be corrected to be low by the amount of afterglow of the R phosphor, so that the chromaticity shift due to PWM driving in the red direction is reduced, and color reproducibility is improved. Can be improved. The maximum value of the voltage applied to the display element 12 of the phosphor color (red in the present embodiment) having a slower response speed is applied to the display elements 12 of other colors (blue and green in the present embodiment). Since it is sufficient that the applied voltage is lower than the maximum value of the voltage to be applied, the voltage applied to the display element 12 of the phosphor color (blue and green in the present embodiment) having a faster response speed during PWM driving. The maximum value may be set higher than when the PWM drive is not being performed.
　図４は、実施の形態に係る表示制御方法の手順を示すフローチャートである。ステップＳ１０において、タッチ駆動期間である場合（ステップＳ１０、ＹＥＳ）、タッチ駆動制御部２２は、駆動周波数でセンサ素子１３から検知信号を入力し、タッチ検出部２３は、入力された検知信号に基づいて接触を検出するが、ＰＷＭノイズ検出部２４は、ノイズの検出を行わない。タッチ駆動期間ではなくアイドル期間である場合（ステップＳ１０、ＮＯ）、ステップＳ１２において、タッチ駆動制御部２２は、所定のタイミングでセンサ素子１３から検知信号を入力し、ＰＷＭノイズ検出部２４は、入力された検知信号をフーリエ変換してノイズの周波数及び強度を算出する。ＰＷＭ駆動周波数の範囲のノイズの強度が所定の閾値以上である場合（ステップＳ１２、ＹＥＳ）、ステップＳ１４において、ホワイトバランス調整部２５は、蛍光体の応答速度がより遅い赤色の表示素子１２に印加する電圧の最大値を低くするよう表示駆動制御部２１に指示する。ステップＳ１２において、ＰＷＭ駆動周波数の範囲のノイズの強度が所定の閾値未満である場合（ステップＳ１２、ＮＯ）、ホワイトバランス調整部２５は、電圧の最大値を調整せずに、ステップＳ１０に戻る。 FIG. 4 is a flowchart showing the procedure of the display control method according to the embodiment. In step S10, when it is a touch drive period (step S10, YES), the touch drive control unit 22 inputs a detection signal from the sensor element 13 at the drive frequency, and the touch detection unit 23 is based on the input detection signal. However, the PWM noise detection unit 24 does not detect noise. When it is an idle period instead of a touch drive period (step S10, NO), in step S12, the touch drive control unit 22 inputs a detection signal from the sensor element 13 at a predetermined timing, and the PWM noise detection unit 24 inputs The frequency and intensity of noise are calculated by Fourier transforming the detected signal. When the noise intensity in the PWM drive frequency range is equal to or higher than a predetermined threshold (step S12, YES), in step S14, the white balance adjustment unit 25 applies the red display element 12 with a slower response speed of the phosphor. The display drive control unit 21 is instructed to lower the maximum value of the voltage to be applied. In step S12, when the noise intensity in the PWM drive frequency range is less than the predetermined threshold (step S12, NO), the white balance adjustment unit 25 returns to step S10 without adjusting the maximum value of the voltage.
　図４に示した例では、駆動期間にはＰＷＭノイズの検出を行わないが、別の例では、駆動期間にもＰＷＭノイズの検出を行ってもよい。この場合、ＰＷＭノイズ検出部２４は、タッチ駆動制御部２２により入力されたセンサ素子１３の検知信号のうち、接触が検出されなかった領域の検知信号を所定のタイミングでフーリエ変換してノイズの周波数及び強度を算出してもよい。これにより、タッチパネル１０が操作されている間も、色度のずれを適切に補正し、色再現性を向上させることができる。 In the example shown in FIG. 4, PWM noise is not detected during the drive period, but in another example, PWM noise may be detected during the drive period. In this case, the PWM noise detection unit 24 Fourier-transforms a detection signal of a region where no contact is detected among the detection signals of the sensor element 13 input by the touch drive control unit 22 at a predetermined timing, thereby generating a noise frequency. And the intensity may be calculated. Thereby, even when the touch panel 10 is operated, the chromaticity shift can be appropriately corrected, and the color reproducibility can be improved.
　ＰＷＭノイズ検出部２４は、フーリエ変換により算出したノイズの周波数及び強度から、ＰＷＭのデューティー比を推定し、ホワイトバランス調整部２５は、ＰＷＭノイズ検出部２４により推定されたＰＷＭのデューティー比に応じて、表示素子１２に印加する電圧の最大値を調整してもよい。図３に示したように、デューティー比が小さくなるほど、赤色へのシフトが大きくなるので、赤色の表示素子１２に印加する電圧の最大値をより小さくしてもよい。これにより、より適切に色度を補正し、色再現性を向上させることができる。 The PWM noise detection unit 24 estimates the PWM duty ratio from the noise frequency and intensity calculated by Fourier transform, and the white balance adjustment unit 25 responds to the PWM duty ratio estimated by the PWM noise detection unit 24. The maximum value of the voltage applied to the display element 12 may be adjusted. As shown in FIG. 3, the smaller the duty ratio, the greater the shift to red, so the maximum value of the voltage applied to the red display element 12 may be made smaller. Thereby, chromaticity can be corrected more appropriately and color reproducibility can be improved.
　本開示の一態様の概要は、次の通りである。本発明の一態様の表示制御装置は、応答速度の異なる複数の色の蛍光体を備えるバックライトと、複数の表示素子と、複数のセンサ素子とを備えるタッチパネルの複数の表示素子に駆動電圧を印加する表示駆動制御部と、複数のセンサ素子から検知信号を入力する入力部と、入力部により入力された検知信号からノイズの周波数及び強度を検出する検出部と、検出部により検出されたノイズの周波数及び強度に基づいて、表示駆動制御部が複数の表示素子に印加する駆動電圧を調整する調整部と、を備える。 The outline of one aspect of the present disclosure is as follows. A display control device according to one embodiment of the present invention provides a driving voltage to a plurality of display elements of a touch panel including a backlight including a plurality of colors of phosphors having different response speeds, a plurality of display elements, and a plurality of sensor elements. A display drive control unit to be applied, an input unit for inputting detection signals from a plurality of sensor elements, a detection unit for detecting the frequency and intensity of noise from the detection signals input by the input unit, and the noise detected by the detection unit And an adjustment unit that adjusts the drive voltage applied to the plurality of display elements by the display drive control unit based on the frequency and intensity of the display.
　この態様によると、表示装置の色再現性を高く保ちつつ、色域を向上させることができる。 According to this aspect, the color gamut can be improved while keeping the color reproducibility of the display device high.
　調整部は、検出部により検出された、バックライトの輝度を調整するためのパルス幅変調（ＰＷＭ）の周波数を含む所定の範囲の周波数のノイズの強度が所定の閾値以上である場合に、駆動電圧を調整してもよい。この態様によると、ＰＷＭ駆動中であることを適切に検出して、ＰＷＭ駆動に起因する色度のずれを適切に補正することができるので、色再現性を向上させることができる。 The adjusting unit is driven when the noise intensity of a predetermined range including a pulse width modulation (PWM) frequency for adjusting the luminance of the backlight detected by the detecting unit is equal to or higher than a predetermined threshold. The voltage may be adjusted. According to this aspect, it is possible to appropriately detect that the PWM drive is being performed, and to appropriately correct the chromaticity shift caused by the PWM drive. Therefore, it is possible to improve color reproducibility.
　調整部は、応答速度がより遅い蛍光体の色の表示素子に印加する電圧を低く調整してもよい。この態様によると、ＰＷＭ駆動に起因する蛍光体の残光の影響を低減させることができるので、色再現性を向上させることができる。 The adjusting unit may adjust the voltage applied to the phosphor display device having a slower response speed to a low voltage. According to this aspect, it is possible to reduce the influence of phosphor afterglow caused by PWM driving, so that color reproducibility can be improved.
　本発明の別の態様もまた、表示制御装置である。この表示制御装置は、応答速度の異なる複数の色の蛍光体を備えるバックライトと、複数の表示素子と、複数のセンサ素子とを備えるタッチパネルのバックライトの輝度を調整するために、バックライトの点灯期間がバックライトの輝度に応じた長さとなるように、バックライトの点灯期間をＰＷＭ方式により制御するＰＷＭ制御部と、ＰＷＭ制御部により制御される点灯期間にしたがってバックライトのオンオフを制御するバックライト制御部と、複数の表示素子に駆動電圧を印加する表示駆動制御部と、複数のセンサ素子から検知信号を入力する入力部と、入力部により入力された検知信号からノイズの周波数及び強度を検出する検出部と、検出部により検出されたノイズの周波数及び強度に基づいて、表示駆動制御部が複数の表示素子に印加する駆動電圧を調整する調整部と、を備える。 Another aspect of the present invention is also a display control device. This display control apparatus is configured to adjust the luminance of a backlight of a touch panel including a backlight having a plurality of phosphors having different response speeds, a plurality of display elements, and a plurality of sensor elements. A PWM control unit that controls the lighting period of the backlight by the PWM method so that the lighting period becomes a length according to the luminance of the backlight, and controls on / off of the backlight according to the lighting period controlled by the PWM control unit A backlight control unit, a display drive control unit that applies a drive voltage to a plurality of display elements, an input unit that inputs detection signals from the plurality of sensor elements, and the frequency and intensity of noise from the detection signals input by the input units And a display drive control unit having a plurality of display elements based on the frequency and intensity of noise detected by the detection unit. And a adjusting unit that adjusts the driving voltage applied to.
　この態様によると、表示装置の色再現性を高く保ちつつ、色域を向上させることができる。 According to this aspect, the color gamut can be improved while keeping the color reproducibility of the display device high.
　調整部は、検出部により検出された、ＰＷＭ制御部により制御されるＰＷＭの周波数を含む所定の範囲の周波数のノイズの強度が所定の閾値以上である場合に、駆動電圧を調整してもよい。この態様によると、ＰＷＭ駆動中であることを適切に検出して、ＰＷＭ駆動に起因する色度のずれを適切に補正することができるので、色再現性を向上させることができる。 The adjustment unit may adjust the drive voltage when the intensity of noise in a predetermined range including the PWM frequency controlled by the PWM control unit detected by the detection unit is equal to or greater than a predetermined threshold. . According to this aspect, it is possible to appropriately detect that the PWM drive is being performed, and to appropriately correct the chromaticity shift caused by the PWM drive. Therefore, it is possible to improve color reproducibility.
　調整部は、応答速度がより遅い蛍光体の色の表示素子に印加する電圧を低く調整してもよい。この態様によると、ＰＷＭ駆動に起因する蛍光体の残光の影響を低減させることができるので、色再現性を向上させることができる。 The adjusting unit may adjust the voltage applied to the phosphor display device having a slower response speed to a low voltage. According to this aspect, it is possible to reduce the influence of phosphor afterglow caused by PWM driving, so that color reproducibility can be improved.
　ＰＷＭ制御部及びバックライト制御部と、表示駆動制御部、入力部、検出部及び調整部とは、異なる回路に実装されてもよい。ＰＷＭ制御部がＰＷＭ駆動中であるか否かを調整部が直接知ることができない場合であっても、検出部によりＰＷＭ駆動中であるか否かを的確に検出することができるので、ＰＷＭ駆動に起因する蛍光体の残光の影響を低減させることができるので、色再現性を向上させることができる。 The PWM control unit and the backlight control unit, the display drive control unit, the input unit, the detection unit, and the adjustment unit may be mounted on different circuits. Even if the adjustment unit cannot directly know whether or not the PWM control unit is in the PWM drive, the detection unit can accurately detect whether or not the PWM drive is in progress. Since the influence of phosphor afterglow caused by the above can be reduced, color reproducibility can be improved.
　本発明のさらに別の態様は、表示制御方法である。この方法は、応答速度の異なる複数の色の蛍光体を備えるバックライトと、複数の表示素子と、複数のセンサ素子とを備えるタッチパネルの複数の表示素子に駆動電圧を印加するステップと、複数のセンサ素子から検知信号を入力するステップと、入力された検知信号からノイズの周波数及び強度を検出するステップと、検出されたノイズの周波数及び強度に基づいて、複数の表示素子に印加する駆動電圧を調整するステップと、を備える。 Still another aspect of the present invention is a display control method. The method includes applying a driving voltage to a plurality of display elements of a touch panel including a backlight having a plurality of phosphors having different response speeds, a plurality of display elements, and a plurality of sensor elements; A step of inputting a detection signal from the sensor element, a step of detecting a frequency and intensity of noise from the input detection signal, and a drive voltage applied to the plurality of display elements based on the detected frequency and intensity of noise. Adjusting.
　この態様によると、表示装置の色再現性を高く保ちつつ、色域を向上させることができる。 According to this aspect, the color gamut can be improved while keeping the color reproducibility of the display device high.
　調整するステップは、検出するステップにより検出された、バックライトの輝度を調整するためのＰＷＭの周波数を含む所定の範囲の周波数のノイズの強度が所定の閾値以上である場合に、駆動電圧を調整してもよい。この態様によると、ＰＷＭ駆動中であることを適切に検出して、ＰＷＭ駆動に起因する色度のずれを適切に補正することができるので、色再現性を向上させることができる。 The adjusting step adjusts the drive voltage when the intensity of noise in a predetermined range including the PWM frequency for adjusting the luminance of the backlight detected in the detecting step is equal to or higher than a predetermined threshold. May be. According to this aspect, it is possible to appropriately detect that the PWM drive is being performed, and to appropriately correct the chromaticity shift caused by the PWM drive. Therefore, it is possible to improve color reproducibility.
　表示制御方法であって、調整するステップは、応答速度がより遅い蛍光体の色の表示素子に印加する電圧を低く調整してもよい。この態様によると、ＰＷＭ駆動に起因する蛍光体の残光の影響を低減させることができるので、色再現性を向上させることができる。 In the display control method, the adjusting step may adjust the voltage applied to the phosphor color display element having a slower response speed. According to this aspect, it is possible to reduce the influence of phosphor afterglow caused by PWM driving, so that color reproducibility can be improved.
　以上、本開示を実施の形態をもとに説明した。実施の形態は例示であり、それらの各構成要素あるいは各処理プロセスの組合せにいろいろな変形例が可能なこと、またそうした変形例も本開示の範囲にあることは当業者に理解されるところである。 The present disclosure has been described based on the embodiments. The embodiments are exemplifications, and it will be understood by those skilled in the art that various modifications can be made to the respective constituent elements or combinations of the respective treatment processes, and such modifications are also within the scope of the present disclosure. .
　本開示は、表示装置への表示を制御する表示制御装置に利用可能である。 The present disclosure can be used for a display control device that controls display on a display device.
１０　タッチパネル、
１１　バックライト、
１２　表示素子、
１３　センサ素子、
２０　ＴＤＤＩ、
２１　表示駆動制御部、
２２　タッチ駆動制御部、
２３　タッチ検出部、
２４　ＰＷＭノイズ検出部、
２５　ホワイトバランス調整部、
３０　ホスト装置、
３１　入力インタフェース、
３２　アプリケーション、
３３　表示信号生成部、
３４　表示信号出力部、
３５　輝度設定部、
３６　ＰＷＭ制御部、
３７　ＬＥＤドライバ。 10 Touch panel,
11 Backlight,
12 display elements,
13 sensor elements,
20 TDDI,
21 display drive control unit,
22 touch drive control unit,
23 Touch detector,
24 PWM noise detector,
25 White balance adjustment section,
30 host device,
31 input interface,
32 applications,
33 display signal generator,
34 Display signal output section,
35 Brightness setting section,
36 PWM controller,
37 LED driver.

Claims (10)

  1. 　応答速度の異なる複数の色の蛍光体を備えるバックライトと、複数の表示素子と、複数のセンサ素子とを備えるタッチパネルの前記複数の表示素子に駆動電圧を印加する表示駆動制御部と、
    　前記複数のセンサ素子から検知信号を入力する入力部と、
    　前記入力部により入力された検知信号からノイズの周波数及び強度を検出する検出部と、
    　前記検出部により検出されたノイズの周波数及び強度に基づいて、前記表示駆動制御部が前記複数の表示素子に印加する駆動電圧を調整する調整部と、
    を備える、
    　表示制御装置。     A display drive control unit that applies a drive voltage to the plurality of display elements of a touch panel including a backlight including phosphors of a plurality of colors having different response speeds, a plurality of display elements, and a plurality of sensor elements;
    An input unit for inputting detection signals from the plurality of sensor elements;
    A detection unit for detecting the frequency and intensity of noise from the detection signal input by the input unit;
    An adjustment unit that adjusts a drive voltage applied to the plurality of display elements by the display drive control unit based on the frequency and intensity of noise detected by the detection unit;
    Comprising
    Display control device.
  2. 　請求項１に記載の表示制御装置であって、
    　前記調整部は、前記検出部により検出された、前記バックライトの輝度を調整するためのパルス幅変調（ＰＷＭ）の周波数を含む所定の範囲の周波数のノイズの強度が所定の閾値以上である場合に、前記駆動電圧を調整する、
    　表示制御装置。     The display control device according to claim 1,
    When the adjustment unit detects the intensity of noise in a predetermined range including a frequency of pulse width modulation (PWM) for adjusting the luminance of the backlight detected by the detection unit is equal to or greater than a predetermined threshold Adjusting the drive voltage;
    Display control device.
  3. 　請求項１又は請求項２に記載の表示制御装置であって、
    　前記調整部は、応答速度がより遅い蛍光体の色の表示素子に印加する電圧を低く調整する、
    　表示制御装置。     The display control device according to claim 1 or 2,
    The adjustment unit adjusts the voltage applied to the phosphor display device having a slower response speed to a low level,
    Display control device.
  4. 　応答速度の異なる複数の色の蛍光体を備えるバックライトと、複数の表示素子と、複数のセンサ素子とを備えるタッチパネルの前記バックライトの輝度を調整するために、前記バックライトの点灯期間が前記バックライトの輝度に応じた長さとなるように、前記バックライトの点灯期間をＰＷＭ方式により制御するＰＷＭ制御部と、
    　前記ＰＷＭ制御部により制御される点灯期間にしたがって前記バックライトのオンオフを制御するバックライト制御部と、
    　前記複数の表示素子に駆動電圧を印加する表示駆動制御部と、
    　前記複数のセンサ素子から検知信号を入力する入力部と、
    　前記入力部により入力された検知信号からノイズの周波数及び強度を検出する検出部と、
    　前記検出部により検出されたノイズの周波数及び強度に基づいて、前記表示駆動制御部が前記複数の表示素子に印加する駆動電圧を調整する調整部と、
    を備える、
    　表示制御装置。     In order to adjust the luminance of the backlight of a backlight including a plurality of phosphors of different colors with different response speeds, a plurality of display elements, and a plurality of sensor elements, the lighting period of the backlight is the A PWM control unit for controlling the lighting period of the backlight by a PWM method so as to have a length according to the luminance of the backlight;
    A backlight control unit that controls on / off of the backlight according to a lighting period controlled by the PWM control unit;
    A display drive controller for applying a drive voltage to the plurality of display elements;
    An input unit for inputting detection signals from the plurality of sensor elements;
    A detection unit for detecting the frequency and intensity of noise from the detection signal input by the input unit;
    An adjustment unit that adjusts a drive voltage applied to the plurality of display elements by the display drive control unit based on the frequency and intensity of noise detected by the detection unit;
    Comprising
    Display control device.
  5. 　請求項４に記載の表示制御装置であって、
    　前記調整部は、前記検出部により検出された、前記ＰＷＭ制御部により制御されるＰＷＭの周波数を含む所定の範囲の周波数のノイズの強度が所定の閾値以上である場合に、前記駆動電圧を調整する、
    　表示制御装置。     The display control device according to claim 4,
    The adjusting unit adjusts the driving voltage when the intensity of noise in a predetermined range including a PWM frequency controlled by the PWM control unit detected by the detecting unit is equal to or higher than a predetermined threshold. To
    Display control device.
  6. 　請求項４又は請求項５に記載の表示制御装置であって、
    　前記調整部は、応答速度がより遅い蛍光体の色の表示素子に印加する電圧を低く調整する、
    　表示制御装置。     The display control device according to claim 4 or 5, wherein
    The adjustment unit adjusts the voltage applied to the phosphor display device having a slower response speed to a low level,
    Display control device.
  7. 　請求項４から請求項６のいずれかに記載の表示制御装置であって、
    　前記ＰＷＭ制御部及び前記バックライト制御部と、前記表示駆動制御部、前記入力部、前記検出部及び前記調整部とは、異なる回路に実装される、
    　表示制御装置。     The display control device according to any one of claims 4 to 6,
    The PWM control unit and the backlight control unit, the display drive control unit, the input unit, the detection unit, and the adjustment unit are mounted on different circuits.
    Display control device.
  8. 　応答速度の異なる複数の色の蛍光体を備えるバックライトと、複数の表示素子と、複数のセンサ素子とを備えるタッチパネルの前記複数の表示素子に駆動電圧を印加するステップと、
    　前記複数のセンサ素子から検知信号を入力するステップと、
    　入力された検知信号からノイズの周波数及び強度を検出するステップと、
    　検出されたノイズの周波数及び強度に基づいて、前記複数の表示素子に印加する駆動電圧を調整するステップと、
    を備える、
    　表示制御方法。     Applying a driving voltage to the plurality of display elements of a touch panel including a backlight including phosphors of a plurality of colors with different response speeds, a plurality of display elements, and a plurality of sensor elements;
    Inputting detection signals from the plurality of sensor elements;
    Detecting the frequency and intensity of noise from the input detection signal;
    Adjusting the drive voltage applied to the plurality of display elements based on the detected frequency and intensity of noise;
    Comprising
    Display control method.
  9. 　請求項８に記載の表示制御方法であって、
    　前記調整するステップは、前記検出するステップにより検出された、前記バックライトの輝度を調整するためのＰＷＭの周波数を含む所定の範囲の周波数のノイズの強度が所定の閾値以上である場合に、前記駆動電圧を調整する、
    　表示制御方法。     The display control method according to claim 8, comprising:
    In the adjusting step, when the intensity of noise in a predetermined range including a PWM frequency for adjusting the luminance of the backlight detected by the detecting step is equal to or higher than a predetermined threshold, Adjust the drive voltage,
    Display control method.
  10. 　請求項８又は請求項９に記載の表示制御方法であって、
    　前記調整するステップは、応答速度がより遅い蛍光体の色の表示素子に印加する電圧を低く調整する、
    　表示制御方法。     The display control method according to claim 8 or 9, wherein
    The adjusting step adjusts a voltage applied to a phosphor color display element having a slower response speed to a low level.
    Display control method.
PCT/JP2019/012595 2018-03-29 2019-03-25 Display control device and display control method WO2019189028A1 (en)

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JP2016130952A (en) * 2015-01-14 2016-07-21 キヤノン株式会社 Electronic apparatus, control method of electronic apparatus, program, and storage medium
JP2017003699A (en) * 2015-06-08 2017-01-05 三菱電機株式会社 Liquid crystal display
JP2018041413A (en) * 2016-09-09 2018-03-15 キヤノン株式会社 Electronic apparatus and method for controlling the same, program, and storage medium

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JP2016130952A (en) * 2015-01-14 2016-07-21 キヤノン株式会社 Electronic apparatus, control method of electronic apparatus, program, and storage medium
JP2017003699A (en) * 2015-06-08 2017-01-05 三菱電機株式会社 Liquid crystal display
JP2018041413A (en) * 2016-09-09 2018-03-15 キヤノン株式会社 Electronic apparatus and method for controlling the same, program, and storage medium

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