TWI326444B - Gate driver - Google Patents

Gate driver Download PDF

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Publication number
TWI326444B
TWI326444B TW094142427A TW94142427A TWI326444B TW I326444 B TWI326444 B TW I326444B TW 094142427 A TW094142427 A TW 094142427A TW 94142427 A TW94142427 A TW 94142427A TW I326444 B TWI326444 B TW I326444B
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TW
Taiwan
Prior art keywords
output
circuit
input
delay
circuits
Prior art date
Application number
TW094142427A
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English (en)
Other versions
TW200723233A (en
Inventor
Wei Ming Chen
Original Assignee
Denmos Technology Inc
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 Denmos Technology Inc filed Critical Denmos Technology Inc
Priority to TW094142427A priority Critical patent/TWI326444B/zh
Priority to US11/340,170 priority patent/US20070126483A1/en
Publication of TW200723233A publication Critical patent/TW200723233A/zh
Application granted granted Critical
Publication of TWI326444B publication Critical patent/TWI326444B/zh

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
    • H03K19/003—Modifications for increasing the reliability for protection
    • H03K19/00346—Modifications for eliminating interference or parasitic voltages or currents
    • 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
    • G09G3/2085—Special arrangements for addressing the individual elements of the matrix, other than by driving respective rows and columns in combination
    • 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
    • G09G3/3674—Details of drivers for scan electrodes
    • G09G3/3677—Details of drivers for scan electrodes suitable for active matrices only
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
    • 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
    • G09G2330/025—Reduction of instantaneous peaks of current
    • 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
    • G09G2330/04—Display protection
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/16—Modifications for eliminating interference voltages or currents
    • H03K17/161—Modifications for eliminating interference voltages or currents in field-effect transistor switches
    • H03K17/162—Modifications for eliminating interference voltages or currents in field-effect transistor switches without feedback from the output circuit to the control circuit
    • H03K17/163—Soft switching
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/0036—Means reducing energy consumption

Description

^26444 18233twf.doc/006 九、發明說明： 【發明所屬之技術領域】 本發明是有關於-種驅動平面顯示器的裝置，且特別 是有關於一種閘極驅動器。 【先前技術】 平面顯示斋例如液晶顯示器，近來已被廣泛地使用。 隨著半導體技術岐良，使得液晶齡^具有低的消耗電 功率、薄型量輕、解析度高、色彩飽和度高、壽命長等優 點’因而廣泛地應用在筆記型電腦或桌上型電腦的液晶榮 幕及液晶電視(LCD TV)等與生活息息相關之電子產品。其 中，顯不器的閘極驅動器更是液晶顯示器不可或缺的重要 元件。 一-般來說’閘極驅動器通常會有—種功能，稱之為全 =位(Allhighf刪ti〇n)。此功能一般用在液晶顯示器级 面板關機時，用以將所有的像素電容放電。圖认 ‘不為習知閘極驅動器的電路方塊圖。圖ib緣示為習知 閘極驅動器的時脈圖。在圖M巾，閉極驅動器ι〇 輸出電路⑽。每一個輸出電路腦包括一個啟 丨I!些啟動端咖接收一致能訊號OA。當致能訊 ^邏輯高電位轉為邏輯低電位時，由於所有的 啟動端ΕΝ皆接收此致能訊號〇Α，因此便 出端王立rJ1 hlgh functl0n) °每個輸出電路100的輸 出k 0G[1]〜〇G[N]皆輸出邏輯高 電晶體使其導通。 要位以控制面板的缚膜 由上面電路圖以及圖m的時脈圖可以看到，在 18233twf,doc/006 全^準位⑽high f職tkm)魏啟動時，_驅動器 很大的電流對液晶面板充電，使得驅動電路以及^ 大電流，因此可能會造成間極驅動器的損; ^綱編_轉_雖, 【發明内容】 、本發明的目的就是在提供一種間極驅動器，用以全言 準位功能(All high fUnction)所造成不必要 = 少積體電路佈局面積。 力手為耗並減 ，發明提出-種閘極驅動.此難驅動器包括多個 輸出电路以及多個延遲電路。每一輸出電路包括啟 母一延遲電路之輸出端墟下—延遲電路之輪人端 Γΐ遲電路之輸入端接收一致能訊號，每一延遲電路之轸 別糕接對應的該些輸出電路之啟動端，以致 旎該些輪出電路。 斤软 本發明因採用多個延遲電路將致能訊號延遲，在全言 要:：:(Αη ¥ ——η)啟動時’使得閘極驅動器不需 讯號致能的瞬間驅動較大的負载，另外面 大Γ對液晶面板充電。因此，除了可以減少面： 电"IL 更可以減少積體電路佈局面積以;§访# pq ϋ 器損壞的顺。 Μ積以及減低閘極驅動 為讓本發明之上述和其他目的、特徵和優點 文特舉較佳實施例，並配合所附圖式，作詳細說 1326444 18233twf.doc/006 間後輸出至第二個延遲電路DL—2與第二個輸出電路 0T一2。接下來便重複上述操作。 在此可以看出，習知的閘極驅動器當全高準位功能 (All hlgh functi〇n)啟動時，所有的輸出電路將會輸出高電 位，因此會有很大的瞬間電流。然而，在本發明的實施例 中由於輸出電路0T-1〜0T-N為分批啟動，不會同時啟 動，因此不會在全高準位功能(A11 high funcd〇n)啟動 φ 瞬間產生彳艮大的瞬間電流。 上述的延遲電路DL-hDL，有許多不同的實施 方式例如如圖4所不，由兩個反相器INV1與購 構成-個延遲電路，利用第—反相器mvi與第二反相器 INV2的雜輯作為預設時μ，將致能喊⑽每經過一 級延遲電路便延遲-個預設時間。另外，延遲電路亦可以 例如圖5的方式實施。利用一串D型觸發器^〜D-叫， 第们D i觸發裔D—j的輸入端接收致能訊號，每經 • 過一個時脈時間CK，便將致能訊號 〇A傳送到下一個〇 型觸發器。 紅上所返，本發明因採用多個延遲電路將致能訊號延 遲，在全高準位功能⑽high functi〇n)啟動日夺，使得間極 驅動器不需要在致能訊號致能的瞬間驅動較大的負載，另 外面板系統不會有大電流對液晶面板充電。因此，、除了可 以減少面板電流外，更可以減少積體電路佈局面積以及減 低閘極驅動器損壞的風險。 8 1326444 18233twf.doc/006 雖然本發明已以較佳實施例揭露如上’然其並非用以 限定本發明，任何熟習此技藝者，在不脫離本發明之精神 和範圍内，當可作些許之更動與潤飾，因此本發明之保 範圍當視後附之申請專利範圍所界定者為準。 【圖式簡單說明】 圖1Α 4會示為習知閘極驅動器之電路方塊圖。
圖1Β緣示為習知圖1Α閘極驅動器之操作回時 圖2繪不為本發明實施例閘極驅動器' Θ 圖3緣示為本發明實施例圖2電路之 塊圖。 圖4與圖5繪示為本發明實施例閑極驅動=圖。 電路的實施電路圖。 功益中的延遲 【主要元件符號說明】 10 :閘極驅動器 100、〇τ_1〜〇τ—輪出電路 出的訊說
OG[l]〜OG[N]:輸出電路所輸 OA :致能訊號 EN :啟動端 DL—1〜DL—N~1 .延遲電路 SR :移位暫存器 B1〜B3 :輸出緩衝器 INV卜INV2 :反相器 D_1〜D_N-1 : D型觸發器

Claims (1)

1326444 I8233twf.doc/006 十、申請專利範圚·· 】.-種閘椏驅動器，用以當 fimciion)啟動時，防止 位功能(Aii high 多個輪出電路，每—大，此閘極驅動器包括: 多個延遲電路，每—延電路包括啟動端；以及 電路之輸入端，第一個雪' 之輸出端耦接下一延遲 輸出端更分別_咖㈣:出電 路之啟動‘以依序致能該些輸出電路。輸出電 士申。月專利範圍第1項所述之間極驅動哭、盆由 -該些延遲電路包括： _黑動杰，其中母 兮…t第一反相器’包括輸入端以及輸出端，輸入端接收 =此訊號’輯資料轉送致能訊號做邏輯反相後輪出； -第二反相H，包括輸人端以及輸 端’ 3. 如申請專利範圍第i項所述之間極驅動器，1中 一該些延遲電路包括： 山一 D型觸發器，包括輸入端、輸出端以及時脈輸入 端，其輸入端為延遲電路之輸入端，時脈輸入端接收一時 脈訊號，其輪出端為該延遲電路之輸出端。 4. 如申請專利範圍第1項所述之閘極驅動器，其中每 一該些輸出電路包括： “ 一輪出緩衝器，包括控制端，輸出緩衝器的控制端耦 1326444 18233twf.doc/006 接該輸出電路之啟動端，用以啟動輸出緩衝器。 5.如申請專利範圍第1項所述之閘極驅動器，其中每 一該些輸出電路包括： 多個輸出缓衝器，每一該些輸出緩衝器包括控制端， 輸出緩衝器的控制端耦接該輸出電路之啟動端，用以啟動 輸出緩衝器。 ‘
TW094142427A 2005-12-02 2005-12-02 Gate driver TWI326444B (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
TW094142427A TWI326444B (en) 2005-12-02 2005-12-02 Gate driver
US11/340,170 US20070126483A1 (en) 2005-12-02 2006-01-25 Gate driver

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Application Number Priority Date Filing Date Title
TW094142427A TWI326444B (en) 2005-12-02 2005-12-02 Gate driver

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TW200723233A TW200723233A (en) 2007-06-16
TWI326444B true TWI326444B (en) 2010-06-21

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* Cited by examiner, † Cited by third party
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CN101409542B (zh) * 2007-10-11 2016-01-20 瑞昱半导体股份有限公司 数字电路的重置方法及相关信号产生装置
CN102890923B (zh) * 2012-10-23 2016-03-09 深圳市华星光电技术有限公司 一种液晶面板的扫描驱动电路、液晶显示装置和驱动方法

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US20070126483A1 (en) 2007-06-07
TW200723233A (en) 2007-06-16

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