TWI376975B - Active-matrix image display device - Google Patents

Active-matrix image display device Download PDF

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Publication number
TWI376975B
TWI376975B TW093119871A TW93119871A TWI376975B TW I376975 B TWI376975 B TW I376975B TW 093119871 A TW093119871 A TW 093119871A TW 93119871 A TW93119871 A TW 93119871A TW I376975 B TWI376975 B TW I376975B
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TW
Taiwan
Prior art keywords
modulator
voltage
display device
image display
control
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TW093119871A
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English (en)
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TW200505268A (en
Inventor
Roy Philippe Le
Christophe Prat
Christophe Fery
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Thomson Licensing Sa
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Publication of TW200505268A publication Critical patent/TW200505268A/zh
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Publication of TWI376975B publication Critical patent/TWI376975B/zh

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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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • 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
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    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3275—Details of drivers for data electrodes
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • 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
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0404—Matrix technologies
    • G09G2300/0417—Special arrangements specific to the use of low carrier mobility technology
    • 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
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0439—Pixel structures
    • G09G2300/0465—Improved aperture ratio, e.g. by size reduction of the pixel circuit, e.g. for improving the pixel density or the maximum displayable luminance or brightness
    • G—PHYSICS
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    • 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
    • G09G2300/0819—Several active elements per pixel in active matrix panels used for counteracting undesired variations, e.g. feedback or autozeroing
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    • G09G2300/0833—Several active elements per pixel in active matrix panels forming a linear amplifier or follower
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    • 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
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    • 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
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    • G09G2300/00—Aspects of the constitution of display devices
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    • G—PHYSICS
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    • 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
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    • G09G2300/0876—Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
    • G—PHYSICS
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    • G09G2300/00—Aspects of the constitution of display devices
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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
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    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
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    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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    • G09G2320/00—Control of display operating conditions
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    • G09G2320/043—Preventing or counteracting the effects of ageing
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    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2011—Display of intermediate tones by amplitude modulation

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)

Description

1376975
五、發明說明（1) 【發明所屬之技術領域】 本發明係關於主動矩陣影像顯示 【先前技術】 μ|i 影像顯示器平面顯示幕日漸用於各 車輛顯示裝置、數位照相機或行動電話種，用途’諸如機動 已知顯示器内，光發射器係由有^雷 “ OLED(有機光射二極體）顯示所形成。 榮光電池，諸如 具體而言，被動矩陣OLED型顯示器， 可得。然而，欲要耗費大量電力，且使用f商業上已廣泛 主動矩陣OLED顯示器包含隱藏式電 #命簡短。 優點，諸如減少耗電、高解析、與视頻 $件’具有許多 較被動矩陣OLED顯示器長。 ’相容’且使用壽命 習用上，主動矩陣顯示器裝置包括 光發射器陣列所形成。各光發射器與面 了面板:特別由 副圖元有關，並利用行電極陣列和列I，要顯示的影像 加以定址。 巧電極陣列藉位址電路 第1圊表示光發射器E(以下稱發射器 電路。更精確言之，此為電壓位址電路。 、相關之位址 典型上’此類位址電路包括發射器之控她 機構。係經由列電極陣列和行電極陣列加以^艰構和供電 極用來從顯示面板的所有發射器，選擇再 ，，°此等電 射器E。 以定址特定發 * 發射器位址機構包括控制開關I 1，儲存办 流調變器Μ。 電容器C和電
第6頁 五、發明說明（2) 過之；^器M一把般圖：或副圖元的資料控制電壓，變換成* 體組此種；；；：==是二或 流過其間)，以及心：：：極：：：^ 調變益為第丨圖所示n型時，調變 =動，為p型時，詞變電流在源極和没極/u•間“ '和源極間 一發射器串聯。此申聯的二終端接 1 。調變器Μ 接至…〜而陰極終端一般陽極終端 以第1圖中習知結構之OLED顯示器而言，係 形成：主動矩陣的界面：調變器之沒極〜型發射器2 況)再接至供電電極Vdd，而發射器之陰接接ί 以具有反逆結構的〇LED顯示器而言（上 =器的陰極形成與主動矩陣的界面：調 源、發 況）或沒極（p型情況）再 3 3藏極（η型情 至供電電極Vdd。 ’發射器的陽極則接 此調變器發生没極電流變習器:： = = 2運作時， 施電位差之四倍函數變化％用上以調變15閘極和源極間所 需定址光發射器時，斜 的列.電極vselect施以控制電】接開關η閘極 啟，即對調變器Μ的閛極，施广，·。開關11開 vdata。 施以存在於灯電極之資料電麗 1376975 五、發明說明（5) 〜— 要2 0 〇 1年），包含以電流程式規劃圖元結構。此定址 補償帶電載子之活動性變化，以及連帶臨限電壓之變4式 然而’電流程式規劃必須考慮到對低亮度的很低電流化° ，會大為提高建立輸送至0LED光發射器的，適當電埯二饭準 式規劃時間。此外，使用此法製成的各位址電流，每需輕 射器需植入四個TFT。此法不很經濟’且大大減少圖_—發 用的光發射面積。 凡可 另一法載於文件〈漢城國立大學AM-LCD 02，
第頁〉，利用包括二額外TFT的電壓位址電路，達 壓補償。此等電晶體接在控制開關11和電流調變器M成電 。此法根據之原理，使第一額外電晶體的電壓臨限之間 變器M —致，因為在其製造當中，此等組件與用來對和調 晶的薄膜加熱的雷射光束掃描方向平行，因此實質上森结 同樣的再結晶狀況。在如此位址電路，第一額外電晶$到 跳脫臨限電壓，會自動補償調變器的跳脫電壓，故^ 的 發射器的汲極電流，與跳脫電壓無關。須知第二薄膜電曰 體容許儲存於充電電容器内的電壓重置。 曰曰 然而’該法中的位址電流亦需製造四電晶體位址電路 。此較大複雜性會降低顯示器的可靠性和產率，以致實曾 增加生產成本〇 另一法載於EP 1 381 019文件，尤指其第42和43段參 見其第7和11圖’此電壓控制法使用運算放大器54，此補 償，於同行圖元的全部調變器32之調脫臨限值變化；此放 大器的輪出經由開關SW2a和電極Xi，速接至調變器32的閘
1376975 五、發明說明（7) 制該發射器，並包括源電極、汲電極、閘電極 和跳脫臨限電壓（vth)，跳脫臨限電壓逐一調變 器而異； —行位址機構，對其調變器之閘電極施以資料電 壓，即能夠定址發射器各行的發射器，以便加 以控制； 一列選擇機構，藉施以選擇電壓，能夠從各列發 射器選擇發射器； —補償機構，以補償各調變器之跳脫臨限電壓； 其特徵為，
—補償機構包括至少一運算放大器，此運算放大器 之反饋能夠補償至少一調變器之臨限電壓，不論該電壓值 如何； 一該放電器具有反相輸入（-)、非反相輸入（+ )和輸 出接端， —運算放大器的非反相輸入（〇係接至控制該調變 器之行位址機構； —運算放大器的反相輸入（-)係接至該調變器之源 電極；
一運算放大器的輸出係接至該調變器之閘電極。 按照本發明特殊具體例，顯示裝置包含一項或多項下 列特點： ♦·. 一對於與發射器相關之該調變器，控制機構包括至 少第一控制開關，連接於運算放大器的輸出和該調變器的
第12頁 1376975 五、發明說明（ίο) 元件包括光發射器E’及其相關之位址電路ι〇β 習用上，此位址電路10包括電流調變器M、第一控制 開關II、儲存電容器c、列選擇電極Vseiect、行位址電極 vdata，以及電壓供電電極vdd。 在圖示具體例中’調變器為n型，而發射器為具有習 知結構之OLED型二極體。同樣電路亦可應用於虬肿顯示器 ’具有反相結構’惟使用P型調變器，而調變器-發射器串 聯則倒反’意即發射器的陽極接至供電電極Vdd，而調變器 之没極接至地電極。 其次’參考第4圖說明另一電路，適用於具有習用 OLED結構之p型調變器，亦可應用於具有反相〇LED結構之η 型調變器。 供電源Vdd接至調變器Μ之汲極。對調變器μ的閘極應用 資料電壓Vdata時，在汲極和源極間即建立設定點電流，亦 稱汲極電流，供應於光發射器E的陽極。 此汲極電流的強度，尤視調變器電晶體的跳脫臨限電 壓Vth而定。光發射器E發射對此電流成比例之光量，故同 樣資料電壓在逐一發射器間不會發生同樣光量。 為補償臨限電壓内局部空間變化引起的亮度變化，本 發明位址電路含有運算放大器丨丨，供電流調變器Μ的跳脫 臨限電壓Vth補償之用。 ^ 上’行位址電極在此接至運算放大器11的非反相 變/M之源極接至運算放大器的反相接端（一） 大丨1之輪出接端接至調變器Μ之閘極’可藉
1376975 五、發明說明（11) 控制電壓加以開啟。 選擇開關II宜在調變器Μ閘極和運算放大器11的輸出 接端之間串聯，而開關I 2在調變器源極和運算放大器的反 相接端（-)間串聯，此等開關的控制器連捧於同列選擇電 極 Vselect 〇 在此結構内，由運算放大器所得反饋，宜補償調變器 Μ之跳脫臨限電壓Vth，不論此電壓值如何。
因此，由於運算放大器的反饋，發射器E的陽極電壓 亦等於行資料電壓Vdata，而調變器所發射流經發射器之汲 極電流，即無關調變器Μ的跳脫臨限電壓Vth。由運算放大 器發生的閘極-源極電壓，補償調變器Μ的臨限電壓，不拘 其值如何。因此，在此設有電流發生器，根據不固定的相 等二極體負載，利用資料電壓Vdata加以控制。 此外，跳脫臨限電壓反饋之應用，宜與資料控制電壓 Vdata*選擇控制電壓Vselect之應用同步。 此位址電極宜又含第一控制開關11，利用列控制電極 開和關。此第一開關11接在運算放大器11的輸入和電流調 變器Μ的閘極之間，以便加以開啟。 對第一開關11的閘極施以掃描控制電壓Vselect時，即加 以開啟，而運算放大器的輸出電壓則施於調變器閘極。
位址電路亦可含有額外開關I 2，接在調變器Μ的源極 和運算放大器1 1的反相接端（-)t之·間，容許運算放大器以 反饋方式運算。 此第二開關亦宜利用施於列選擇電極之掃描電壓Vselect
第16頁 1376975 五、發明說明（〗3) 第二·具體例。 第4圖_表示本，此時調變器為p型，發射器為習用 nTFng5 _ 你俅用„塑調變器，且將調彎器發射器經加 ED顯不益，惟使 接至供電電極vdd，而 以反相，意即發射由被動組件。 在圖不實施例樣電流亦可應用於反相結 結構的OLED型二極體 的源極接至地電極 和第3圓所示笫 .具體例一樣’運算放大器2 1以反鎖 "Λ* "Λν. * ^ ® ,, λ,,, 和第一且體例不同的是，發射器的供電電壓vdd在此經 由破動組件R接至調變器M的源極。由於調變器係p型，調 變器的汲極在此接至光發射器£的陽極。當資料控制電壓 Vdata施於p型調變器之閘極時’汲極電流即在此情況下通過 調變器，從其源極到其汲極。 此被動組件可例如包括電極、電阻器、二極體或電路 。在第4圖所示具體例中，此被動組件宜由薄膜電阻器R組 成。 選擇發射器時’對調變器Μ的閘極施以資料電壓， 故施於電阻器R和調變器源極共同之接端，而汲極電 經調變器Μ和發射器E。此電流按如下線性律界定： Id_(Vdd_Vdate)/R (方程式 1 ) 故電/’IL發生器根據固定負載R，利用資料電廢^控制
1376975 五、發明說明（14) 。由於此固定負載，發射器宜完全獨立於二極體或發射器 E的特性加以驅動。 可證流經調變器和發射器E的電流，與其跳脫臨限電 壓無關。此外，由於電路供電電壓Vdd —定，汲極電流可利 用資料電壓Vdate直接控制。對固定控制電壓而言，汲極電 流即告一定。 此外，如上所述，在圖元經掃描後，調變器Μ即呈飽 和運算模式，而汲極電流則由下列界定：
Id=k/2. W/I(Vgs-Vth)2 (方程式 2) 對固定資料電壓而言，汲極電流Id 一定（參見方程式1) ，所以跳脫臨限電壓Vth和閘極-源極電壓間之差值一定。 是故，有賴運算放大器的反饋，跳脫臨限電壓Vth和閘 極-源極電壓，永遠彼此相對調節。 因此，汲極電流不隨各種p型電晶體之跳脫臨限電壓 而異。圖元逐一變化不再影響到流經光發射器的電流。 第5圖簡略表示主動矩陣顯示器面板的發射器陣列之 一部份。 習周上，在如此顯示器面板中，發射器陣列及其位址 電路，即以諸列和諸行配置。 宜對列電極η施以掃描電壓Vselect，n，以控制此列圖元用 之全部第一和第二控制開關I 1，I 2。 相對應於所要顯示影像的視頻資料攀壓Vdata, i和Vdata, j ’ 經由行電極供電於諸行之運算放大器。 如第5圖所示，發射器陣列宜每行僅含單一運算放大
第19頁 1376975 五、發明說明（15) 器。此運算放大器Ain能夠補償此行各調變器Min，Mim的各種 跳脫臨限電壓。 當發射器陣列的各列受到掃描時，其掃描相當於影像 圖幅，顯示器面板之諸行運算放大器Ain，Ajn，同時補償此 列全部調變器之跳脫臨限電壓。 行運算放大器之輸出，經由第一控制開關II，接至此 行各調變器之閘極，此行運算放大器的反相輸入（-)，則 經由第二控制開關I 2，接至此行各調變器之源極。
為選擇發射器Ein，對此發射器的列電極η施以選擇電 壓Vseleet,n ’而為得所需發射’再對此發射器Ein的行電極i施 以資料電壓Vdata,i。 如上所述，第一和第二控制開關11，I 2開啟時，對調 變器Min的源極施以資料控制電壓Vdata, i。此調變器之跳脫臨 限電壓，利用行放大器Ain的輸出補償，而調變器Min把汲極 電流發射入發射器Ein内。 由於面板或發射器陣列每行只包括單一運算放大器， 以補償臨限電壓變化，又因此面板的各圖元只包括三個電 晶體，可得廉假面板，提供很均勻的亮度位準，和很好的 視覺舒適。
第20頁 1376975 圓式簡單說明 【圖式簡單說明】 第1圖為先前技術已知光發射器位址電路之簡圖； 第2圖為利用已知低溫聚矽（LTPS)結晶技術製造的各 種薄膜電晶體電流-電壓特性曲線圖； 第3圖為本發明第一具體例之簡圖，其中位址電路電 流調變器為η型； 第4圖為本發明第二具體例之簡圖，其中位址電路調 變器為Ρ型； 第5圖為本發明第一具體例發射器陣列一部份之簡圖《 【主要元件符號說明】
Vdata，Vdata，i，Vdaia，j 視頻資料電壓 Vselect» ^select, n> Vselect.m 掃描電壓 M’ Min，Miu，Mjn 調變器 E, Ejn, Eim, Ejn 光發射器 Ain，A jn，1 1，2 1 運算放大器 11,12 控制開關 c 充電電容器 vdd 電流供應電壓 Id 汲極電流 Vth 跳脫臨限電壓 Vgs 閘極-源極電壓 10 位址電路 R 被動組件 Cc 補償電容器 第21頁

Claims (1)

  1. I37697f^^£2™ 、申請專利範園 一種主動矩陣影像顯示裝置，包括： 一若干光發射器（E. E. p 、 1、 佈成諸列和諸行ln’ in)，形成發射器陣列，分 -一控制機構，以控制陆 括： 制陣列的光發射器之發射，包 一每陣列之各光菸身 器，能夠控制^菸二（^^，^有—電流調變 極、閘電極和：二射器’並包括源電極、汲電 壓（vth)逐一/ =限電壓^) ’跳脫臨限電 -…機構；：⑷)而異； 以資料電^調變器H)之間電極施 發射器(Ε. ^ 7 乂即能夠定址發射器各行的 ln，w )，以便加以控制； 歹1選擇機構’藉施以選擇電壓1 從各列菸射„ 、select，n )，此夠 _Jk毛射益（In，Eln )選擇發射器； 補仏機構（Ain，A j 以 之跳脫臨限電壓（v 、. 铺彳貝各调豸益（Mim ) v v th ^ » 其特徵為， 一補償機構包括 之反饋能夠補償至少— 限電壓值如何； 至少一運算放大器，此運算放大器 調變器之跳脫臨限電壓，不論該臨 一該運算玫大 和輸出接端； 裔具有反相輸入（-）、非反相輸入（+ ) —運算放大器 器之行位址機構； 的非反相輸入（+ )係接至控制該調變
    第22頁 1376975 ._案卜％香丨替镎y月Ο曰 修正_ 六、申請專利範圍 一運算放大器的反相輸入（-)係接至該調變器之源 電極； 一運算放大器的輸出係接至該調變器之閘電極者。 2. 如申請專利範圍第1項之影像顯示裝置，其中對與 發射器相關之該調變器，控制機構包括至少第一控制開關 (I 1 )，連接在運算放大器（Αιη, 1 1，2 1 )的輸出和該調變器 (M,n )的閘電極之間，第一控制開關具有閘電極，能夠接受 此發射器（Ειη)用之列選擇電壓（Vselect，n)者。 3. 如申請專利範圍第2項之影像顯示裝置，其中.對與 發射器相關之該調變器，控制機構包括第二控制開關（I 2) ，連接在運算放大器（Αιη, ίΐ, 2 1 )的反相輸入（-)和調變器 (Μ )的源電極之間，第二控制開關（I 2)具有閘電極，連接 於該第一控制開關（I 1 )的閘電極，以便同步接受選擇電壓 (Vse丨ect)者。 . 4. 如申請專利範圍第2或3項之影像顯示裝置，其中列 選擇機構能夠供電於該第一控制開關至少其一之閘電極， 以便在此列内選擇至少一發射器（Ein)者。 5. 如申請專利範圍第1項之影像顯示裝置，其中補償 機構包括運算放大器（Ain，1 1，2 1)，能夠補償控制行發射器 (Ein，Eim)的全部調變器（Min，Mim)之跳脫臨限電壓（Vth)者。 6 ·如申請專利範圍第3項之影像顯示裝置，其中調變 器（Μιη)以及第一（I 1 )和第二（I 2)控制開關係於薄膜多晶矽 或薄膜非晶形矽内製成之組件者。 7 ·如申請專利範圍第1項之影像顯示裝置，其中調變
    第23頁 1376975 W年\。月 <日修(更)正替換頁案j<L.--.aaug87i —一~一 _η 修正 六、申請專利範圍 器（Min)係η型電晶體，而其汲極係由供電機構（vdd)供電 者。 8. 如申請專利範圍第1項之影像顯示裝置，其中調變 器（Min)係p型電晶體，而控制機構又包含被動組件（R )，置 -於調變器（Min)的源電極和供電電極（Vdd )之間者。 9. 如申請專利範圍第1項之影像顯示裝置，其中各發 射器（E )係光射二極體者。
    第24頁
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