JP5011514B2 - 液晶表示装置の駆動方法及び液晶表示装置 - Google Patents
液晶表示装置の駆動方法及び液晶表示装置 Download PDFInfo
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- JP5011514B2 JP5011514B2 JP2009068142A JP2009068142A JP5011514B2 JP 5011514 B2 JP5011514 B2 JP 5011514B2 JP 2009068142 A JP2009068142 A JP 2009068142A JP 2009068142 A JP2009068142 A JP 2009068142A JP 5011514 B2 JP5011514 B2 JP 5011514B2
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- 239000004973 liquid crystal related substance Substances 0.000 title claims description 90
- 238000000034 method Methods 0.000 title claims description 14
- 239000000126 substance Substances 0.000 claims description 25
- 238000002834 transmittance Methods 0.000 claims description 21
- 230000008859 change Effects 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 11
- 230000003287 optical effect Effects 0.000 description 10
- 238000010586 diagram Methods 0.000 description 7
- 230000002093 peripheral effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000004044 response Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 239000010409 thin film Substances 0.000 description 4
- 230000006386 memory function Effects 0.000 description 3
- 230000004069 differentiation Effects 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000000737 periodic effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3614—Control of polarity reversal in general
-
- 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
- G09G3/3648—Control of matrices with row and column drivers using an active matrix
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2300/00—Aspects of the constitution of display devices
- G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
- G09G2300/0809—Several active elements per pixel in active matrix panels
- G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/021—Power management, e.g. power saving
-
- 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
- G09G3/3618—Control of matrices with row and column drivers with automatic refresh of the display panel using sense/write circuits
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal Display Device Control (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal (AREA)
Description
すなわち、フリッカの問題と消費電力の問題とはトレードオフの関係にあり、低消費電力を実現しつつ、フリッカを抑えることが可能な液晶表示装置の開発が望まれていた。
また、第2のリフレッシュ動作に移行させる際に、フィードスルー効果の影響を受けて、液晶物質の光学特性が少しだけ変化することになるが、引き続いて第1のリフレッシュ動作を行うため、変化した後の光学特性が更に所定期間だけ保持されることになる。
第1のリフレッシュ動作と第2のリフレッシュ動作とを、例えば1Hz程度よりも低い周波数で切り替えることにより、第2のリフレッシュ動作へ移行する際の光学特性の変化に起因したフリッカが人の目に認識されにくくなる。
また、液晶物質の光学特性(光透過率及び光反射率)を変化させることなく、メモリのリフレッシュを行えるため、フリッカの発生が抑えられる。
しかも、同じ色(例えば白色)を表示している場合であっても、人の目が色の変化として認識し難いくらいの長い時間(例えば、1秒以上)を周期として、画素電圧の位相及び共通電圧の位相を反転させるので、焼き付きの発生を防止することができる。
図1は本実施の形態に係る液晶表示装置の概略構成を示す模式図である。本実施の形態に係る液晶表示装置は、制御回路101、画像メモリ102、電源回路103、ソースドライバ104、ゲートドライバ105、液晶パネル106、反射板(不図示)を備え、外光の反射によって表示を行う反射型の液晶表示装置である。
なお、本実施の形態では、第1のリフレッシュ動作時に、画素電圧及び共通電圧を連続的に2回フリップさせているが、2回に限らず、偶数回行うことも可能である。
なお、本実施の形態では、第2のリフレッシュ動作時に、画素電圧及び共通電圧を1回だけフリップさせているが、1回に限定する必要はなく、3回以上の奇数回行うことも可能である。
11 画素電極
12 スイッチング素子
13 共通電極
14 液晶物質
15 メモリ
101 制御回路
102 画像メモリ
103 電源回路
104 ソースドライバ
105 ゲートドライバ
Claims (4)
- 画素電極に印加する画素電圧をスイッチング素子によりオン/オフ制御すると共に、前記画素電圧に対応するデータを前記スイッチング素子のオフ期間に前記画素電極に接続したメモリを用いて保持することにより、液晶物質の光透過率又は光反射率を制御する液晶
表示装置の駆動方法において、
前記液晶物質の光透過率又は光反射率が変化しないような時間間隔で前記メモリに対するリフレッシュを偶数回行う動作を所定期間内に繰り返す第1のリフレッシュ動作と、前記所定期間経過後に前記メモリに対するリフレッシュを奇数回行う第2のリフレッシュ動作とを交互に繰り返し、
一つのコラム上で配列している全ての画素へのデータの書き込みを行っていない間、前記コラム上で配列しているソースバスラインの電圧を、ホワイト画素を表示するときの画素電圧レベルに保つことを特徴とする液晶表示装置の駆動方法。 - 前記所定期間を、前記第2のリフレッシュ動作を行う期間よりも長く設定してあることを特徴とする請求項1に記載の液晶表示装置の駆動方法。
- 画素電極に印加する画素電圧をスイッチング素子によりオン/オフ制御すると共に、前記画素電圧に対応するデータを前記スイッチング素子のオフ期間に前記画素電極に接続したメモリを用いて保持することにより、液晶物質の光透過率又は光反射率を制御する液晶表示装置において、
前記液晶物質の光透過率又は光反射率が変化しないような時間間隔で前記メモリに対するリフレッシュを偶数回行う動作を所定期間内に繰り返す第1のリフレッシュ動作と、前記所定期間経過後に前記メモリに対するリフレッシュを奇数回行う第2のリフレッシュ動作とを交互に繰り返す手段と、
一つのコラム上で配列している全ての画素へのデータの書き込みを行っていない間、前記コラム上で配列しているソースバスラインの電圧を、ホワイト画素を表示するときの画素電圧レベルに保つ手段と
を備えることを特徴とする液晶表示装置。 - 前記所定期間を、前記第2のリフレッシュ動作を行う期間よりも長く設定してあることを特徴とする請求項3に記載の液晶表示装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009068142A JP5011514B2 (ja) | 2009-03-19 | 2009-03-19 | 液晶表示装置の駆動方法及び液晶表示装置 |
US12/716,156 US8866711B2 (en) | 2009-03-19 | 2010-03-02 | Driving method including refreshing a pixel memory and liquid crystal display device utilizing the same |
TW99107421A TWI423236B (zh) | 2009-03-19 | 2010-03-15 | 液晶顯示裝置之驅動方法以及液晶顯示裝置 |
CN201010149505.6A CN101840685B (zh) | 2009-03-19 | 2010-03-17 | 液晶显示装置的驱动方法以及液晶显示装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009068142A JP5011514B2 (ja) | 2009-03-19 | 2009-03-19 | 液晶表示装置の駆動方法及び液晶表示装置 |
Publications (2)
Publication Number | Publication Date |
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JP2010223995A JP2010223995A (ja) | 2010-10-07 |
JP5011514B2 true JP5011514B2 (ja) | 2012-08-29 |
Family
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Application Number | Title | Priority Date | Filing Date |
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JP2009068142A Active JP5011514B2 (ja) | 2009-03-19 | 2009-03-19 | 液晶表示装置の駆動方法及び液晶表示装置 |
Country Status (4)
Country | Link |
---|---|
US (1) | US8866711B2 (ja) |
JP (1) | JP5011514B2 (ja) |
CN (1) | CN101840685B (ja) |
TW (1) | TWI423236B (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TWI421852B (zh) * | 2011-06-13 | 2014-01-01 | Univ Nat Chiao Tung | 類比型畫素儲存電路 |
TWI416497B (zh) * | 2010-12-28 | 2013-11-21 | Au Optronics Corp | 液晶顯示裝置之驅動方法及其相關裝置 |
JP5771453B2 (ja) * | 2011-06-20 | 2015-09-02 | 株式会社ジャパンディスプレイ | 表示装置および電子機器 |
WO2014007199A1 (ja) * | 2012-07-06 | 2014-01-09 | シャープ株式会社 | 液晶表示装置およびその制御方法、ならびにゲートドライバ |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3830970A (en) * | 1972-04-26 | 1974-08-20 | C Hurley | Automatic intensity control for picture tube display systems |
GB2312773A (en) * | 1996-05-01 | 1997-11-05 | Sharp Kk | Active matrix display |
TW521249B (en) * | 2000-09-05 | 2003-02-21 | Toshiba Corp | Display apparatus and its driving method |
JP2002229532A (ja) * | 2000-11-30 | 2002-08-16 | Toshiba Corp | 液晶表示装置及び液晶表示装置の駆動方法 |
US6747623B2 (en) * | 2001-02-09 | 2004-06-08 | Semiconductor Energy Laboratory Co., Ltd. | Liquid crystal display device and method of driving the same |
JP2002297100A (ja) * | 2001-03-29 | 2002-10-09 | Mitsubishi Electric Corp | 液晶表示装置ならびにそれを備える携帯電話機および携帯情報端末機器 |
JP2002351430A (ja) * | 2001-05-30 | 2002-12-06 | Mitsubishi Electric Corp | 表示装置 |
GB0117226D0 (en) * | 2001-07-14 | 2001-09-05 | Koninkl Philips Electronics Nv | Active matrix display devices |
US6897843B2 (en) * | 2001-07-14 | 2005-05-24 | Koninklijke Philips Electronics N.V. | Active matrix display devices |
GB0308167D0 (en) * | 2003-04-09 | 2003-05-14 | Koninkl Philips Electronics Nv | Active matrix array device electronic device and operating method for an active matrix device |
JP4213637B2 (ja) * | 2003-09-25 | 2009-01-21 | 株式会社日立製作所 | 表示装置及びその駆動方法 |
US7633470B2 (en) * | 2003-09-29 | 2009-12-15 | Michael Gillis Kane | Driver circuit, as for an OLED display |
KR100805587B1 (ko) * | 2006-02-09 | 2008-02-20 | 삼성에스디아이 주식회사 | 디지털-아날로그 변환기 및 이를 채용한 데이터 구동회로와평판 표시장치 |
JP4687770B2 (ja) * | 2008-10-28 | 2011-05-25 | 奇美電子股▲ふん▼有限公司 | アクティブマトリクス型表示装置 |
-
2009
- 2009-03-19 JP JP2009068142A patent/JP5011514B2/ja active Active
-
2010
- 2010-03-02 US US12/716,156 patent/US8866711B2/en active Active
- 2010-03-15 TW TW99107421A patent/TWI423236B/zh not_active IP Right Cessation
- 2010-03-17 CN CN201010149505.6A patent/CN101840685B/zh active Active
Also Published As
Publication number | Publication date |
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CN101840685A (zh) | 2010-09-22 |
JP2010223995A (ja) | 2010-10-07 |
US8866711B2 (en) | 2014-10-21 |
TW201035960A (en) | 2010-10-01 |
CN101840685B (zh) | 2014-05-28 |
US20100238154A1 (en) | 2010-09-23 |
TWI423236B (zh) | 2014-01-11 |
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