JP4348318B2 - 階調表示基準電圧発生回路および液晶駆動装置 - Google Patents
階調表示基準電圧発生回路および液晶駆動装置 Download PDFInfo
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- JP4348318B2 JP4348318B2 JP2005166688A JP2005166688A JP4348318B2 JP 4348318 B2 JP4348318 B2 JP 4348318B2 JP 2005166688 A JP2005166688 A JP 2005166688A JP 2005166688 A JP2005166688 A JP 2005166688A JP 4348318 B2 JP4348318 B2 JP 4348318B2
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- 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
-
- 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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3685—Details of drivers for data electrodes
- G09G3/3688—Details of drivers for data electrodes suitable for active matrices only
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2310/00—Command of the display device
- G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
- G09G2310/0264—Details of driving circuits
- G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
- G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
Description
表示データをデジタル‐アナログ変換するときに用いる階調表示用の基準電圧を生成する階調表示基準電圧発生回路において、
表示を行う対象物の基準電位に対して、正極性駆動用の複数の第1基準電圧を生成する第1基準電圧生成部と、
上記第1基準電圧生成部により生成された上記複数の第1基準電圧とは極性が逆の負極性駆動用の複数の第2基準電圧を生成する第2基準電圧生成部と、
正極性駆動時に上記第1基準電圧生成部からの上記複数の第1基準電圧を出力する一方、負極性駆動時に上記第2基準電圧生成部からの上記複数の第2基準電圧を出力するための複数の基準電圧出力と
を備え、
上記第1基準電圧生成部は、複数の第1抵抗素子が直列に接続され、その複数の第1抵抗素子による抵抗分割により上記複数の第1基準電圧を生成する第1ラダー抵抗回路を有し、
上記第2基準電圧生成部は、複数の第2抵抗素子が直列に接続され、その複数の第2抵抗素子による抵抗分割により上記複数の第2基準電圧を生成する第2ラダー抵抗回路を有すると共に、
上記第1基準電圧生成部の上記第1ラダー抵抗回路の両端に接続された電源を切り離すための第1電源切り離し部と、
上記第2基準電圧生成部の上記第2ラダー抵抗回路の両端に接続された電源を切り離すための第2電源切り離し部と、
正極性駆動と負極性駆動との切り替え時に所定の短絡期間、上記複数の基準電圧出力の互いに隣接する出力間を夫々短絡する短絡部と
を備えたことを特徴とする。ここで、「表示を行う対象物の基準電位」とは、例えば液晶表示素子の対向電極(共通電極)の電位である。
また、上記第1基準電圧生成部の第1ラダー抵抗回路の両端に接続された電源を第1電源切り離し部により切り離し、上記第2基準電圧生成部の第2ラダー抵抗回路の両端に接続された電源を第2電源切り離し部により切り離すことによって、貫通電流を削減して消費電力を低減できる。
さらに、正極性駆動と負極性駆動との切り替え時に所定の短絡期間、複数の基準電圧出力の互いに隣接する出力間を夫々短絡することによって、抵抗分割により作成された階調表示電圧各々の電荷を分配させることで、極性反転時の基準電源からの充放電電流を削減できる。
上記第1基準電圧生成部の上記複数の第1基準電圧を出力するための複数の第1出力と上記複数の基準電圧出力とを切り離すための第1出力切り離し部と、
上記第2基準電圧生成部の上記複数の第2基準電圧を出力するための複数の第2出力と上記複数の基準電圧出力とを切り離すための第2出力切り離し部と
を備えたことを特徴とする。
2,102…対向電極
3,103…ソースドライバ部
4,104…ゲートドライバ部
5,105…コントローラ
6,106…液晶駆動電源
31,131…入力ラッチ回路
32,132…シフトレジスタ
33,133…サンプリングメモリ
34,134…ホールドメモリ
35,135…レベルシフタ回路
36,136…D/A変換回路
37,137…出力回路
38,138…液晶駆動電圧出力端子
39,139…階調表示基準電圧発生回路
111…画素電極
112…画素容量
113…TFT
114…ソース信号ライン
115…ゲート信号ライン
116…対向電極
SD1〜SDn,SD11〜SD1n…第1ソースドライバ〜第nソースドライバ
RH0〜RH64…正極性用抵抗
RL0〜RL64…負極性用抵抗
SWHH,SWHL…アナログスイッチ
SWLH,SWLL…アナログスイッチ
SWH0〜SWH63…アナログスイッチ
SWL0〜SWL63…アナログスイッチ
SWS0〜SWS62…アナログスイッチ
LDH…第1基準電圧生成部
LDL…第2基準電圧生成部
T0〜T63…基準電圧出力端子
TH0〜TH63…第1出力端子
TL0〜TL63…第2出力端子
Claims (6)
- 表示データをデジタル‐アナログ変換するときに用いる階調表示用の基準電圧を生成する階調表示基準電圧発生回路において、
表示を行う対象物の基準電位に対して、正極性駆動用の複数の第1基準電圧を生成する第1基準電圧生成部と、
上記第1基準電圧生成部により生成された上記複数の第1基準電圧とは極性が逆の負極性駆動用の複数の第2基準電圧を生成する第2基準電圧生成部と、
正極性駆動時に上記第1基準電圧生成部からの上記複数の第1基準電圧を出力する一方、負極性駆動時に上記第2基準電圧生成部からの上記複数の第2基準電圧を出力するための複数の基準電圧出力と
を備え、
上記第1基準電圧生成部は、複数の第1抵抗素子が直列に接続され、その複数の第1抵抗素子による抵抗分割により上記複数の第1基準電圧を生成する第1ラダー抵抗回路を有し、
上記第2基準電圧生成部は、複数の第2抵抗素子が直列に接続され、その複数の第2抵抗素子による抵抗分割により上記複数の第2基準電圧を生成する第2ラダー抵抗回路を有すると共に、
上記第1基準電圧生成部の上記第1ラダー抵抗回路の両端に接続された電源を切り離すための第1電源切り離し部と、
上記第2基準電圧生成部の上記第2ラダー抵抗回路の両端に接続された電源を切り離すための第2電源切り離し部と、
正極性駆動と負極性駆動との切り替え時に所定の短絡期間、上記複数の基準電圧出力の互いに隣接する出力間を夫々短絡する短絡部と
を備えたことを特徴とする階調表示基準電圧発生回路。 - 請求項1に記載の階調表示基準電圧発生回路において、
上記第1ラダー抵抗回路の上記複数の第1抵抗素子の抵抗比と、上記第2ラダー抵抗回路の上記複数の第2抵抗素子の抵抗比とが異なることを特徴とする階調表示基準電圧発生回路。 - 請求項1に記載の階調表示基準電圧発生回路において、
正極性駆動と負極性駆動との切り替え時に所定の切り離し期間、上記第1電源切り離し部により上記第1基準電圧生成部の上記第1ラダー抵抗回路の両端に接続された電源を切り離すと共に、上記第2電源切り離し部により上記第2基準電圧生成部の上記第2ラダー抵抗回路の両端に接続された電源を切り離すことを特徴とする階調表示基準電圧発生回路。 - 請求項1または2に記載の階調表示基準電圧発生回路において、
上記第1基準電圧生成部の上記複数の第1基準電圧を出力するための複数の第1出力と上記複数の基準電圧出力とを切り離すための第1出力切り離し部と、
上記第2基準電圧生成部の上記複数の第2基準電圧を出力するための複数の第2出力と上記複数の基準電圧出力とを切り離すための第2出力切り離し部と
を備えたことを特徴とする階調表示基準電圧発生回路。 - 請求項4に記載の階調表示基準電圧発生回路において、
正極性駆動と負極性駆動との切り替え時に所定の切り離し期間、上記第1出力切り離し部により上記第1基準電圧生成部の上記複数の第1出力と上記複数の基準電圧出力とを切り離すと共に、上記第2出力切り離し部により上記第2基準電圧生成部の上記複数の第2出力と上記複数の基準電圧出力とを切り離すことを特徴とする階調表示基準電圧発生回路。 - 請求項1乃至5のいずれか1つに記載の階調表示基準電圧発生回路を用いたことを特徴とする液晶駆動装置。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
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JP2005166688A JP4348318B2 (ja) | 2005-06-07 | 2005-06-07 | 階調表示基準電圧発生回路および液晶駆動装置 |
KR1020060050239A KR100787273B1 (ko) | 2005-06-07 | 2006-06-05 | 계조 표시 기준 전압 발생 회로 및 액정 구동 장치 |
US11/447,098 US7659875B2 (en) | 2005-06-07 | 2006-06-06 | Gradation display reference voltage generating circuit and liquid crystal driving device |
TW095120218A TWI347587B (en) | 2005-06-07 | 2006-06-07 | Gradation display reference voltage generating circuit and liquid crystal driving device |
CN2006100916259A CN1877686B (zh) | 2005-06-07 | 2006-06-07 | 灰度显示基准电压发生电路及液晶驱动装置 |
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JP2005166688A JP4348318B2 (ja) | 2005-06-07 | 2005-06-07 | 階調表示基準電圧発生回路および液晶駆動装置 |
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JP2006343390A JP2006343390A (ja) | 2006-12-21 |
JP4348318B2 true JP4348318B2 (ja) | 2009-10-21 |
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US (1) | US7659875B2 (ja) |
JP (1) | JP4348318B2 (ja) |
KR (1) | KR100787273B1 (ja) |
CN (1) | CN1877686B (ja) |
TW (1) | TWI347587B (ja) |
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JP5110788B2 (ja) * | 2005-11-21 | 2012-12-26 | 株式会社ジャパンディスプレイイースト | 表示装置 |
JP4493681B2 (ja) * | 2007-05-17 | 2010-06-30 | Okiセミコンダクタ株式会社 | 液晶駆動装置 |
CN101826307B (zh) * | 2009-03-06 | 2012-07-04 | 北京京东方光电科技有限公司 | 一种Gamma参考电压的产生电路和产生方法 |
TWI502457B (zh) * | 2013-04-24 | 2015-10-01 | Quanta Comp Inc | 觸控面板 |
TWI521496B (zh) * | 2014-02-11 | 2016-02-11 | 聯詠科技股份有限公司 | 緩衝電路、面板模組及顯示驅動方法 |
US10608017B2 (en) * | 2017-01-31 | 2020-03-31 | Semiconductor Energy Laboratory Co., Ltd. | Display device, display module, and electronic device |
CN107705746A (zh) * | 2017-10-24 | 2018-02-16 | 惠科股份有限公司 | 一种显示装置的驱动装置和驱动方法 |
CN110322852B (zh) * | 2019-06-14 | 2020-10-16 | 深圳市华星光电技术有限公司 | 伽马电压输出电路及其掉阶修复方法、源极驱动器 |
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2005
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- 2006-06-05 KR KR1020060050239A patent/KR100787273B1/ko not_active IP Right Cessation
- 2006-06-06 US US11/447,098 patent/US7659875B2/en active Active
- 2006-06-07 CN CN2006100916259A patent/CN1877686B/zh not_active Expired - Fee Related
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Publication number | Publication date |
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CN1877686B (zh) | 2010-11-03 |
US7659875B2 (en) | 2010-02-09 |
KR20060127775A (ko) | 2006-12-13 |
KR100787273B1 (ko) | 2007-12-20 |
TWI347587B (en) | 2011-08-21 |
JP2006343390A (ja) | 2006-12-21 |
TW200705379A (en) | 2007-02-01 |
CN1877686A (zh) | 2006-12-13 |
US20060274005A1 (en) | 2006-12-07 |
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