JP2009237005A - 画素回路および表示装置並びに画素回路の駆動制御方法 - Google Patents
画素回路および表示装置並びに画素回路の駆動制御方法 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims description 10
- 239000010409 thin film Substances 0.000 claims abstract description 33
- 229910052809 inorganic oxide Inorganic materials 0.000 claims abstract description 25
- 239000010408 film Substances 0.000 claims abstract description 9
- 239000003990 capacitor Substances 0.000 claims description 43
- 239000011159 matrix material Substances 0.000 claims description 9
- 239000000758 substrate Substances 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 3
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 229920001621 AMOLED Polymers 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- ORQBXQOJMQIAOY-UHFFFAOYSA-N nobelium Chemical compound [No] ORQBXQOJMQIAOY-UHFFFAOYSA-N 0.000 description 1
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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
- 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
-
- 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
- G09G2320/04—Maintaining the quality of display appearance
- G09G2320/043—Preventing or counteracting the effects of ageing
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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
- 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]
- G09G3/3266—Details of drivers for scan electrodes
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- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
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- Control Of El Displays (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
Abstract
【解決手段】駆動用トランジスタ11bとスイッチング用トランジスタ11eとを、オフ動作する閾値電圧が負電圧である無機酸化膜薄膜トランジスタから構成し、保持回路を、スイッチング用トランジスタ11eと駆動用トランジスタ11bのゲート端子との間に接続された第1の容量素子11cと、第1の容量素子11cとゲート端子との間の点と負電圧VBを供給する電圧源との間に接続された第2の容量素子11dとを備えたものとする。
【選択図】図2
Description
Vdatamin≧Vscan(off)−VTH ・・・ (2)
本発明の画素回路は、発光素子と、オフ動作する閾値電圧が負電圧である無機酸化膜薄膜トランジスタとを備えた画素回路であって、無機酸化薄膜トランジスタのゲート−ソース間電圧として負電圧が用いられて発光素子の駆動電流が制御されるものであることを特徴とする。
VGS2=(Vdata−VB)×C2/(C1+C2)+VB
となる。なお、Vdataはデータ駆動回路12から供給されるデータ信号の電圧値である。
VGS1=Vscan(off)−Vdata≦VTH
であり、Vscan(off)=0vとすると、
VGS1min=−Vdatamin≦VTH
より、
Vdatamin≧−VTH
として求まる。なお、Vdataminは、データ駆動回路12から出力されるデータ信号の最小設定値である。
VGS2=(Vdatamin−VB)×C2/(C1+C2)+VB≦VTH
であり、上式よりVdatamin=−VTHとすると、
VB≦(1+2×C2/C1)×VTH
が条件として得られる。
VGS2=(Vdatamax−VB)×C2/(C1+C2)+VB≧V2
となるので、
Vdatamax=(V2×(C1+C2)−VB×C1)/C2
として求まる。なお、Vdataminは、データ駆動回路12から出力されるデータ信号の最大設定値である。
VGS1=Vscan(on)−Vdatamax≧V1
より、
Vscan(on)≧V1+Vdatamax
として求まる。
VTH=−1V
V1=+3V
V2=+1V
第1の容量素子11cの容量値C1と第2の容量素子11cの容量値C2との比を、
C2=2×C1
オフ走査信号Vscan(off)を、
Vscan(off)=0v
としてデータ信号、VB,オン走査信号Vscan(on)の値を上式にしたがって算出すると、
Vdatamin=−VTH=+1v
VB=(1+2×C2/C1)×VTH=−5v
Vdatamax=(V2×(C1+C2)−VB×C1)/C2=+4v
Vscan(on)=V1+Vdatamax=+7v
となる。
VGS1=+6v
となり、スイッチング用トランジスタ11eはオン動作し、Vdataminが第1の容量素子11cと第2の容量素子11dに印加される。
VGS2=(Vdatamin−VB)×C2/(C1+C2)+VB=−1v
となり、駆動用トランジスタ11bはオフ動作し、有機EL発光素子11aが消灯することになる。
VGS1=+3v
となり、スイッチング用トランジスタ11eはオン動作し、Vdatamaxが第1の容量素子11cと第2の容量素子11dに印加される。
VGS2=(Vdatamax−VB)×C2/(C1+C2)+VB=+1v
となり、駆動用トランジスタ11bのドレイン電流IDはIfmaxとなり、有機EL発光素子11aが最大輝度で発光することになる。
VGS1=−1v〜−4V
となり、スイッチング用トランジスタ11eはオフ動作し、駆動用トランジスタ11bのゲート−ソース間電圧VGS2を保持することができる。
11 画素回路
11a 有機EL発光素子
11b 駆動用トランジスタ
11c 第1の容量素子
11d 第2の容量素子
11e スイッチング用トランジスタ
12 データ駆動回路
13 走査駆動回路
14 データ線
15 走査線
101 有機EL発光素子
102 駆動用トランジスタ
103 容量素子
104 スイッチング用トランジスタ
Claims (5)
- 発光素子と、該発光素子に接続され、前記発光素子に駆動電流を流す駆動用トランジスタと、該駆動用トランジスタのゲート端子に接続される保持回路と、該保持回路と該保持回路に保持されるデータ信号が流されるデータ線との間に接続されるスイッチング用トランジスタとを備えた画素回路において、
前記駆動用トランジスタと前記スイッチング用トランジスタとが、オフ動作する閾値電圧が負電圧である無機酸化膜薄膜トランジスタから構成され、
前記保持回路が、前記スイッチング用トランジスタと前記駆動用トランジスタのゲート端子との間に接続された第1の容量素子と、該第1の容量素子と前記ゲート端子との間の点と負電圧を供給する電圧源との間に接続された第2の容量素子とを備えたことを特徴とする画素回路。 - 請求項1記載の画素回路が多数配列されたアクティブマトリクス基板と、
前記各スイッチング用トランジスタに該各スイッチング用トランジスタをオン/オフするための走査信号を供給する走査駆動回路と、
前記保持回路に保持されるデータ信号を供給するデータ駆動回路とを備え、
前記走査駆動回路が正電圧の走査信号を供給するものであるとともに、前記データ駆動回路が正電圧のデータ信号を供給するものであることを特徴とする表示装置。 - 前記第2の容量素子に供給される負電圧VBと前記第1の容量素子の容量値C1と前記第2の容量素子の容量値C2と前記閾値電圧VTHとが下式(1)の関係を満たすものであるとともに、前記データ信号の最小設定値Vdataminと前記走査信号のオフ走査信号Vscan(off)と前記閾値電圧VTHとが下式(2)の関係を満たすものであることを特徴とする請求項2記載の表示装置。
VB≦(1+2×C2/C1)×VTH ・・・ (1)
Vdatamin≧Vscan(off)−VTH ・・・ (2) - 発光素子と、オフ動作する閾値電圧が負電圧である無機酸化膜薄膜トランジスタとを備えた画素回路であって、
前記無機酸化薄膜トランジスタのゲート−ソース間電圧として負電圧が用いられて前記発光素子の駆動電流が制御されるものであることを特徴とする画素回路。 - 発光素子と、オフ動作する閾値電圧が負電圧である無機酸化膜薄膜トランジスタとを備えた画素回路の駆動制御方法であって、
前記無機酸化薄膜トランジスタのゲート−ソース間電圧として負電圧を用いて前記発光素子の駆動電流を制御することを特徴とする画素回路の駆動制御方法。
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JP2008079794A JP5063433B2 (ja) | 2008-03-26 | 2008-03-26 | 表示装置 |
US12/412,033 US8368678B2 (en) | 2008-03-26 | 2009-03-26 | Pixel circuit, display apparatus, and pixel circuit drive control method |
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JP2008079794A JP5063433B2 (ja) | 2008-03-26 | 2008-03-26 | 表示装置 |
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JP5063433B2 JP5063433B2 (ja) | 2012-10-31 |
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