WO2005088591A1 - Circuit de correction gamma, ecran d'affichage et affichage ayant ceux-ci - Google Patents

Circuit de correction gamma, ecran d'affichage et affichage ayant ceux-ci Download PDF

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Publication number
WO2005088591A1
WO2005088591A1 PCT/JP2005/004641 JP2005004641W WO2005088591A1 WO 2005088591 A1 WO2005088591 A1 WO 2005088591A1 JP 2005004641 W JP2005004641 W JP 2005004641W WO 2005088591 A1 WO2005088591 A1 WO 2005088591A1
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WO
WIPO (PCT)
Prior art keywords
gamma correction
color
correction circuit
data
display panel
Prior art date
Application number
PCT/JP2005/004641
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English (en)
Japanese (ja)
Inventor
Kenichi Nakata
Original Assignee
Rohm Co., Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Rohm Co., Ltd filed Critical Rohm Co., Ltd
Publication of WO2005088591A1 publication Critical patent/WO2005088591A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/202—Gamma control
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/66—Transforming electric information into light information

Definitions

  • the present invention relates to a gamma correction circuit and a display panel. Further, the present invention relates to a display device such as a liquid crystal display device including a gamma correction circuit and a display panel. Background art
  • a display panel of a display device such as a liquid crystal display device has a non-linear correlation between an applied voltage of a display element and luminance, that is, a gamma characteristic.
  • Figure 5 shows general gamma characteristics.
  • a solid line curve A in FIG. 5 shows the characteristics of the liquid crystal display element when the image voltage (for example, V or V) is directly applied without correction (gamma correction) (that is, gamma characteristics).
  • the horizontal axis represents the applied voltage
  • the vertical axis represents the relative luminance (that is, the light transmittance of the liquid crystal).
  • the image voltage for example, V or V
  • a corrected image obtained by gamma-correcting the image voltage (for example, V or V) so that the image voltage and the luminance are along a dashed straight line B having a linear correlation.
  • Voltage e.g. VI or V
  • FIG. 6 shows a liquid crystal display device including a gamma correction circuit similar to that of Patent Document 4.
  • This liquid crystal display device 101 has a gun for outputting gamma correction setting voltages VI to VI.
  • the source driver 6 outputs the corrected image voltage Vo as an applied voltage to the display panel 107 described below for each source line, the display panel 107, the gate driver 8 that drives the gate lines of the display panel 107, the gamma Non-volatile memory for storing correction data 1 09, including.
  • the gamma correction circuit 105a converts serial gamma correction data, which is also input via the input terminal SD, into digital data corresponding to the gamma correction setting voltages VI to VI.
  • a gamma correction data output circuit 11 la for converting and outputting L-bit (for example, 10-bit) parallel gamma correction data, and m (for example, 9) registers 12 for inputting and holding the parallel gamma correction data To 12 and the data output from registers 12 to 12
  • Buffers 14 to 14 which output gamma correction setting voltages VI to VI. Also
  • the gamma correction data output circuit llla stores the gamma correction data in the nonvolatile memory 109, and retrieves the data from the nonvolatile memory 109 as needed.
  • the source driver 6 uniformly compensates between adjacent voltages (for example, between VI and VI) in the gamma correction set voltage VI to VI which is the output of the gamma correction circuit 105a by m resistors.
  • a resistance ladder 15 that generates an interpolation voltage by using the gamma correction setting voltages VI to VI or an image voltage V corrected by selecting those interpolation voltages according to the n-bit image data Di.
  • the display panel 107 to which the corrected image voltage Vo is input has 2 n gradations. That is, if n is 8, the gray scale of the display panel 107 is 256.
  • the value of m is calculated as 2 n / (m-1). That is, if n is 8 and m is 9, m 'is 32.
  • the corrected image voltage Vo is a voltage equal to VI
  • the corrected image voltage Vo is the center voltage between VI and VI. .
  • the display on the display panel 107 is checked in real time, and the gamma correction setting voltages VI to VI are adjusted by inputting serial gamma correction data to the gamma correction circuit 105a from the outside via the input terminal SD. It is adjusted to become. Once the adjustment is complete
  • the gamma correction data in the adjustment completed state is stored in the non-volatile memory 109, and thereafter, the gamma correction data stored in the non-volatile memory 109 is used.
  • FIG. 7 shows a liquid crystal display device having the same components as the other embodiments in Patent Document 4.
  • This liquid crystal display device 102 is substantially the same as the liquid crystal display device 101 described above. It includes a source driver 6, a display panel 107, a gate driver 8, and a nonvolatile memory 109 having the same circuit configuration or the same structure, and includes a gamma correction circuit 105b having a different configuration from the gamma correction circuit 105a instead of the gamma correction circuit 105a.
  • the gamma correction circuit 105b includes a gamma correction data output circuit 11 lb and two sets of m registers 12 that hold data corresponding to odd-numbered Z-even numbers of horizontal lines (horizontal scanning lines) of the display panel 107. a to 12a, 12b to 12b
  • Horizontal synchronization which is a synchronization signal of horizontal lines of the display panel 107
  • the signal HS is input, and the selectors 117 to 117 are selected according to the odd number Z even number of the horizontal line.
  • the gamma correction circuit 105b uses the functions of the gamma correction circuit 105a to generate gamma correction setting voltages VI to VI according to the odd-numbered Z even-numbered horizontal lines.
  • FIG. 8 shows a liquid crystal display device having components similar to those of the other embodiments in Patent Document 4.
  • the liquid crystal display device 103 includes a source driver 6, a display panel 107, a gate driver 8, and a nonvolatile memory 109 having substantially the same circuit configuration or the same structure as the liquid crystal display devices 101 and 102, and performs gamma correction.
  • a gamma correction circuit 105c having a different configuration from that of the circuits 105a and 105b is included.
  • the gamma correction circuit 105c includes a gamma correction data output circuit 111b, and two sets of m registers 12a to 12a, 12b to 12b that hold data corresponding to odd-numbered Z-even-numbered horizontal lines. Directly to them
  • Selectors 117 to 1 for switching and selecting one of the sets and outputting the same to buffers 14 to 14 described later.
  • This gamma correction circuit 105c It includes a control circuit 118 and the knockers 14 to 14. This gamma correction circuit 105c
  • the correction circuit 105b Similar to the correction circuit 105b, for example, it is suitable for a driving method of a line inversion method in which the polarity of the upper and lower horizontal lines is inverted, but gamma correction setting is further performed according to the odd number z even number of the horizontal line. Since the voltages VI to VI can be changed, the display panel 10
  • Patent Document 1 Japanese Patent Application Laid-Open No. 10-108040
  • Patent Document 2 JP-A-11 32237
  • Patent Document 3 US Pat. No. 5,796,384
  • Patent Document 4 Japanese Patent Application No. 2002-326266 (Japanese Patent Application Laid-Open No. 2004-165749;)
  • a display panel of a color liquid crystal display device has a plurality of display elements arranged two-dimensionally for each color of RGB, and R (red) and G (green) are arranged in a column direction. , B are arranged in stripes in the order of blue (blue).
  • FIG. 2B is a circuit diagram corresponding to the array diagram of FIG. The display elements in one row are connected to one gate line Gi (or Gi or the like), and are provided in the order of R, G, and B colors. Display element in one column
  • the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a gamma correction circuit capable of adjusting the color balance of a display panel, a display panel, and a display device including the same. To provide.
  • a gamma correction circuit is a gamma correction circuit that outputs a gamma correction setting voltage to correct an image voltage according to a non-linear correlation between a voltage applied to a display element and luminance.
  • There is a gamma correction data output circuit that outputs a plurality of gamma correction data for each of the RGB colors, a plurality of registers that inputs and holds a plurality of gamma correction data, and the data of the plurality of registers to analog voltages.
  • a plurality of DZA converters for converting and outputting a gamma correction setting voltage.
  • the gamma correction data output circuit of the gamma correction circuit desirably outputs a plurality of gamma correction data input from outside for each of RGB colors at the time of gamma correction setting voltage adjustment, and adjusts the gamma correction setting voltage. Is for extracting and outputting a plurality of gamma correction data for each color of RGB from the non-volatile memory.
  • the gamma correction data output circuit of the gamma correction circuit outputs a plurality of gamma correction data for each of the RGB colors sequentially in accordance with the horizontal synchronization signal of the display panel.
  • the plurality of registers of the gamma correction circuit are provided for each color of RGB, and the data of the plurality of registers of each color are sequentially selected by the horizontal synchronization signal of the display panel, and the DZA conversion is performed. Entered in ⁇ .
  • the plurality of registers and the plurality of DZA converters of the gamma correction circuit are provided for each color of RGB, and the gamma correction setting voltage of each color is sequentially selected by the horizontal synchronization signal of the display panel. Is output.
  • a plurality of display elements are arranged two-dimensionally for each of RGB colors, and a source is supplied to a plurality of display elements connected to a selected gate line.
  • a display device includes the above-described gamma correction circuit according to a preferred embodiment of the present invention, a gamma correction setting voltage corresponding to the input of image data, and a corresponding gamma correction setting voltage.
  • a source driver for outputting a corrected image voltage by selecting the interpolation voltage of the above, a gate line driven by a gate driver, and the corrected image voltage of the source driver being input to the source line.
  • Another embodiment And the above-described display panel.
  • the gamma correction circuit is provided with a gamma correction data output circuit that outputs a plurality of gamma correction data for each of the RGB colors.
  • gamma correction can be performed for each of the RGB colors.
  • the color balance of the display panel can be adjusted.
  • a plurality of display elements having one color strength are connected to each gate line, and a gate line to which a plurality of display elements of each color are sequentially connected is selected by a horizontal synchronization signal. Therefore, the color balance can be adjusted by performing gamma correction for each of the RGB colors using this gamma correction circuit.
  • the display device including the gamma correction circuit and the display panel can display a good image without shifting to a specific color.
  • FIG. 1 is a circuit diagram of a display device according to a preferred embodiment of the present invention.
  • FIG. 2 is a view showing a display panel of the above, in which (a) is an arrangement diagram of RGB display elements and (b) is a circuit diagram corresponding thereto.
  • FIG. 3 is a circuit diagram of a display device according to another preferred embodiment of the present invention.
  • FIG. 4 is a circuit diagram of a display device according to still another preferred embodiment of the present invention.
  • FIG. 5 is a diagram showing general gamma characteristics.
  • FIG. 6 is a circuit diagram of a display device of the background art.
  • FIG. 7 is a circuit diagram of another display device of the background art.
  • FIG. 8 is a circuit diagram of still another display device of the background art.
  • FIG. 9 shows a color display panel of the background art, where (a) is an arrangement diagram of RGB display elements and (b) is a circuit diagram corresponding thereto.
  • FIG. 1 is a circuit diagram of a liquid crystal display device 1 according to a preferred embodiment of the present invention.
  • the liquid crystal display device 1 includes a gamma correction circuit 5a that outputs gamma correction setting voltages VI to VI for correcting an image voltage according to a nonlinear correlation between an applied voltage of a liquid crystal display element and luminance.
  • n-bit (eg, 8-bit) image data Di and input the corresponding gamma correction setting voltages VI to VI or their interpolation voltages to select the corrected image power Di.
  • a source driver 6 that outputs a voltage Vo as an applied voltage to a display panel 7 described below for each source line, a display panel 7 having a color liquid crystal display element, and a gate driver 8 that drives a gate line of the display panel 7. And a nonvolatile memory 9 for storing gamma correction data.
  • the source driver 6 and the gate driver 8 have substantially the same circuit configuration as the liquid crystal display device 101 described above.
  • the gamma correction circuit 5a converts serial gamma correction data sequentially input for each color of RGB via the external force input terminal SD into gamma correction setting voltages VI to VI.
  • a gamma correction data output circuit 11a that converts L-bit (eg, 10-bit) parallel gamma correction data that is 1 m digital data and outputs the converted data.
  • M for example, 9 registers 12 to 12 for inputting and holding data, and registers 12 to 12
  • the gamma correction data output circuit 11a provides a gamma correction setting
  • serial gamma correction data that is input sequentially is converted to parallel gamma correction data and output to registers 12 through 12, and the gamma correction data for each RGB color is converted.
  • the gamma correction data stored in the non-volatile memory 9 is extracted for each of the RGB colors in order, and output to the registers 12 to 12.
  • the display panel 7 has a plurality of display elements two-dimensionally arranged for each of the RGB colors, and is arranged in the row direction in a stripe shape in the order of R, G, and B colors. They are arranged.
  • FIG. 2B is a circuit diagram corresponding to the arrangement diagram of FIG. Each row, that is, each gate line Gi (or Gi, etc.) has a plurality of display elements of one color strength of RGB.
  • One column that is, one source line 3 ⁇ 4 (or 3 ⁇ 4 etc.) has R
  • the display panel 7 includes a gate line Gi (or Gi or the like) to which a plurality of display elements of each color are sequentially connected by a horizontal synchronization signal HS.
  • the R-color gamma correction setting voltages VI to VI corresponding to the gamma correction data are output.
  • You. Corrected by the gamma correction setting voltage VI to VI The R image voltage Vo is output from the source driver 6 to the display panel 7 as an applied voltage. What is important here is that, at this time, the gate line to which the R-color display element is connected in the display panel 7 is selected. That is, the R color image voltage corrected by the R color gamma correction setting voltages VI to VI corresponding to the R color gamma correction data input to the gamma correction circuit 5a is applied to the R color display element. You. And the next water
  • a plurality of G-color gamma correction data is input to the gamma correction circuit 5a in synchronization with the plane synchronization signal HS, and corrected by the corresponding G-color gamma correction setting voltages VI to VI.
  • the G color image voltage is applied to the G color display element.
  • the same operation is performed for the B color, and these operations are repeated for each of the RGB colors.
  • gamma correction is performed for each of the RGB colors, and while the display on the display panel 7 is checked in real time, the gamma correction data value of the external force is changed, and the gamma correction setting voltage VI Or VI
  • the gamma correction data in the adjustment completed state is stored in the nonvolatile memory 9, and thereafter, the gamma correction data stored in the nonvolatile memory 9 is used.
  • the gamma correction data stored in the nonvolatile memory 9 corresponds to the gamma characteristics of each of the RGB colors.
  • the storage of the gamma correction data in the nonvolatile memory 9 may be performed not only when the adjustment is completed but also every time new gamma correction data is input from an external force.
  • the gamma correction data stored in the non-volatile memory 9 is taken out for each of the RGB colors in order by the horizontal synchronization signal HS. Then, for example, when receiving the horizontal synchronization signal HS and extracting the R color gamma correction data, the data is output to the registers 12 to 12, and the DZA conversion is performed.
  • the gamma correction setting voltage VI is output as the gamma correction setting voltages VI to VI of.
  • the R-color image voltage Vo corrected by 1 m 1 to VI is output from the source driver 6 to the display panel 7 as an applied voltage.
  • the R-color display element The connected gate line is selected. Same for G and B colors The same operation is performed, and these operations are repeated for each of the RGB colors. That is, the gamma correction circuit 5a sequentially outputs the gamma correction setting voltages VI to VI for each of the RGB colors by the horizontal synchronization signal HS, and the display panel 7 is connected to the display element of that color.
  • the selected gate line is selected. As described above, gamma correction is appropriately performed for each of the RGB colors.
  • the gamma correction circuit 5a can perform gamma correction for each of the RGB colors, and thus can adjust the color balance of the display panel.
  • the display panel 7 is configured such that a plurality of display elements having one color strength are connected to each gate line, and a gate line to which a plurality of display elements of each color are sequentially connected is selected by a horizontal synchronization signal HS. Since the gamma correction circuit 5a performs gamma correction for each of the RGB colors, the color balance can be adjusted. Then, the liquid crystal display device 1 including the gamma correction circuit 5a and the display panel 7 can display a good image without shifting to a specific color.
  • the liquid crystal display device 2 is an improvement of the above-described liquid crystal display device 1 in view of reducing current consumption.
  • the liquid crystal display device 2 includes a source driver 6, a display panel 7, a gate driver 8, and a nonvolatile memory 9 having substantially the same circuit configuration or the same structure as the liquid crystal display device 1, and performs gamma correction.
  • a gamma correction circuit 5b having a different configuration from that of the circuit 5a is included instead of the circuit 5a.
  • the gamma correction circuit 5b includes a gamma correction data output circuit l ib and three sets of m registers 12 R to 12 R and 12 G to 12 G provided for each color of RGB.
  • the gamma correction circuit 5b extracts all gamma correction data for each color of RGB from the non-volatile memory 9 when the power is turned on, and stores them in three sets of registers 12R to 12R, 12R.
  • the data is sequentially selected by the horizontal synchronization signal HS and enters the DZA converters 13 to 13. Is converted to an analog voltage, and the gamma correction setting current is supplied via the buffers 14 to 14.
  • the gamma correction data stored in the nonvolatile memory 9 is taken out, that is, the access to the nonvolatile memory 9 is performed for each horizontal synchronization signal HS, whereas the access to the nonvolatile memory 9 is turned on. Only at the time, the number of times can be greatly reduced and the current consumption can be suppressed.
  • the liquid crystal display device 3 includes a source driver 6, a display panel 7, a gate driver 8, and a non-volatile memory 9, which have substantially the same circuit configuration or structure as the liquid crystal display devices 1 and 2 described above.
  • a gamma correction circuit 5c having a different configuration from them is included.
  • the gamma correction circuit 5c includes a gamma correction data output circuit l ib and three sets of m registers 12 R to 12 R, 12 R,
  • Selectors 17 to 17 for selecting and outputting to buffers 14 to 14 to be described later.
  • Selector control circuit 18 that controls switching of selectors 17 to 17 in order by the
  • the gamma correction circuit 5c extracts all gamma correction data for each color of RGB from the nonvolatile memory 9 when the power is turned on, and stores them in three sets of registers 12R to 12R, 12R.
  • the analog voltages for each of the RGB colors are sequentially selected by the horizontal synchronization signal HS, input to the buffers 14 to 14, and output as gamma correction setting voltages VI to VI.
  • the gamma correction circuit 5c can suppress the current consumption of the liquid crystal display device 3 and can switch the gamma correction setting voltage VI to VI at high speed because the voltage has already been converted to an analog voltage. Therefore, it is suitable for a display panel 7 having a high horizontal line frequency and requiring high-speed processing.
  • the D / A conversion ⁇ (DAC) If the current output capability is sufficient, the buffers 14 to 14 can be omitted.
  • the present invention is not limited to the above-described embodiment, and various design changes can be made within the scope of the claims.
  • the liquid crystal display device has been described.
  • the gamma correction circuit, the display panel, and the display device of the present invention are not limited thereto, and a display device requiring gamma correction (for example, an organic EL display device) It is possible to apply to

Abstract

Affichage ayant un écran d'affichage dont l'équilibre des couleurs peut être ajusté. L'affichage (1) comprend un circuit de correction gamme (5a) comprenant un circuit de sortie de données gamma (11a) servant à sortir des données de correction gamma pour chaque couleur de RVB, des registres (121 à 12m) recevant et conservant les données de correction gamma et des convertisseurs numérique/analogique (DAC) (131 à 13m) servant à convertir les données contenues dans les registres (121 à 12m) en tensions analogiques et à sortir les tensions de réglage de la correction gamma VI1 à VIm, un pilote de source (6) recevant les données d'image, choisissant les tensions de réglage de la correction gamma ou leurs tensions d'interpolation conformément aux données d'image et sortant de cette manière une tension d'image corrigée et un écran d'affichage (7) dans lequel les lignes de grille sont reliées pour afficher des éléments affichant chacun une couleur et qui sont pilotés par un pilote de grille (8) et la tension d'image corrigée provenant du pilote de source (6) est entrée dans une ligne source.
PCT/JP2005/004641 2004-03-17 2005-03-16 Circuit de correction gamma, ecran d'affichage et affichage ayant ceux-ci WO2005088591A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004077111A JP2005269110A (ja) 2004-03-17 2004-03-17 ガンマ補正回路、表示パネル及びそれらを備える表示装置
JP2004-077111 2004-03-17

Publications (1)

Publication Number Publication Date
WO2005088591A1 true WO2005088591A1 (fr) 2005-09-22

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JP (1) JP2005269110A (fr)
KR (1) KR20060130231A (fr)
CN (1) CN1954352A (fr)
TW (1) TW200540794A (fr)
WO (1) WO2005088591A1 (fr)

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