WO2005004096A1 - 表示装置およびその駆動方法 - Google Patents
表示装置およびその駆動方法 Download PDFInfo
- Publication number
- WO2005004096A1 WO2005004096A1 PCT/JP2004/009176 JP2004009176W WO2005004096A1 WO 2005004096 A1 WO2005004096 A1 WO 2005004096A1 JP 2004009176 W JP2004009176 W JP 2004009176W WO 2005004096 A1 WO2005004096 A1 WO 2005004096A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- current supply
- supply path
- pixel portion
- current
- display device
- Prior art date
Links
Classifications
-
- 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
-
- 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
-
- 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
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
Definitions
- the present invention relates to a display device for displaying an image using a plurality of pixels arranged in a matrix and a driving method thereof.
- An electroluminescent (EL) element is an element that obtains light emission when a current flows through itself, and a display device manufactured using the element has a wide viewing angle and high luminance because of a self-luminous type. Therefore, it is expected to be a next-generation display device.
- an active matrix display device in which a pixel portion and a peripheral driver circuit are integrally formed on a substrate is suitable for a larger screen and higher definition than a passive matrix display device. It seems to be.
- FIG. 4A shows a basic configuration of an active matrix EL display device.
- a pixel portion 402 is provided over a substrate 401.
- a source signal line driving circuit 403 and a gate signal line driving circuit 404 are provided around the pixel portion 402. Signal input to the source signal line driver circuit 403 and the gate signal line driver circuit 404, current supply to the EL element, and the like are performed from the outside via a flexible printed circuit (Flexible Print Circuit: FPC) 405.
- FPC Flexible Print Circuit
- each pixel has a switching TFT 415 and a driving TFT 416, respectively, and is controlled by signals from a source signal line 412 and a gate signal line 413.
- the switching TFT 415 turns on and a video signal is input to the gate electrode of the driving TFT 416, the current force S and current supply The light is supplied from the line 414 to the EL element 417 via the driving TFT 416 to emit light.
- Patent Document 1 JP 2001-343933 A
- FIG. 5B shows a schematic diagram of a configuration of a driving TFT, an EL element, and a current supply line in the pixel portion 500.
- the driving TFT 502 is a P-type TFT.
- the brightness control of the EL element is determined by the gate-source voltage VGS and the source-drain voltage VDS of the driving TFT 502 as shown in FIG. That is, in the graph shown in FIG. 5 (C), the point indicated by A is the operating point, and the operating point is between the potential V of the current supply line and the potential V of the counter electrode.
- ANODE CATHODE Is divided by the VDS of the driving TFT 502 and the anode-cathode voltage VEL of the EL element.
- Each driving condition differs depending on whether the driving TFT 502 operates in the saturation region or whether it operates in the linear region.
- the voltage drop on the current supply line 501 affects the source potential of the driving TFT 502. That is, a difference occurs in the source potential of the driving TFT 502 between the upper and lower portions of the screen, that is, a difference occurs in VGS.
- the VGS force M of the driving TFT 502 is lower in the lower part of the screen than in the upper part, and the current value is smaller. That is, there is a difference in luminance between the upper part and the lower part of the screen. This becomes more noticeable when the driving TFT 502 operates in the saturation region.
- the voltage drop on the counter electrode 504 side affects the drain potential of the driving TFT 502 when the characteristics of the EL element 503 are not changed. That is, a difference occurs in the drain potential of the driving TFT 502 between the upper and lower portions of the screen, that is, a difference occurs in VDS. Specifically, The VDS of the driving TFT 502 is lower and the current value is lower in the lower part than in the upper part
- the in-plane voltage drop due to the wiring resistance significantly affects the display quality. This becomes more remarkable as the current value consumed in the plane is larger. In other words, it is an unavoidable issue when a large screen is considered.
- the present invention makes it possible to make the in-plane voltage distribution uniform and obtain good display quality without requiring an additional voltage compensating circuit or the like that causes an increase in power consumption. It is an object to provide a display device and a driving method thereof.
- the current supply path to the upper part of the screen and the current supply path to the lower part of the screen are completely separated. Furthermore, it changes the timing of the current supply from the upper part of the screen and the current supply from the lower part of the screen to cancel the voltage drop that occurs in the plane, resulting in a good voltage distribution in the plane. .
- a plurality of current supply paths provided around the pixel portion
- a switch for selecting at least one of the plurality of current supply paths.
- the method for driving a display device includes:
- a current is supplied to the pixel portion using a current supply path selected from the plurality of current supply paths, The selected current supply path is switched over time.
- the switching of the current supply path is performed at least once in one frame period.
- an active matrix display device such as an EL display device
- the present invention is expected to greatly contribute to higher definition and larger screen, which is expected to be further advanced in the future, as the current consumption in the plane is larger.
- FIG. 1A shows an embodiment of the present invention.
- a path for inputting a current from above and below the pixel portion 101 is provided.
- a path input from above the pixel unit 101 is a first current supply path 102
- a path input from below the pixel unit 101 is a second current supply path 103, Arranged as independent paths on the board
- the first current supply path 102 and the second current supply path 103 switch the current supply between ⁇ N and OFF at least once during the frame period. Done. In a certain frame period, during a period indicated by a dotted frame 111, current is supplied from the first current supply path 102, and the second current supply path 103 is in a state where the path is interrupted. I have. On the other hand, in the period shown by the dotted frame 112, the second current supply path 103 is supplied with the current, and the first current supply path 102 is in a state where the path is interrupted.
- the voltage distribution in the pixel portion 101 is as shown in FIG. 1C. Specifically, a voltage drop occurs from the upper right and upper left of the screen, which is closest to the FPC in the current path, to the lower center.
- the voltage distribution in the pixel portion 101 is as shown in FIG. Specifically, a voltage drop occurs from the lower right and lower left corners of the screen closest to the FPC in the current path to the upper center.
- Fig. 1 (C) ⁇ ii>
- Fig. 1 (C) ⁇ i> is shown as an inverted distribution. Due to the influence of the wiring resistance due to the routing force from the force S, FPC to the bottom of the screen, the overall voltage drop is actually larger than i> in Fig. 1 (C).
- the states of ⁇ i> and ⁇ ii> in FIG. 1 (C) are actually different from the voltage drop of ⁇ i> in FIG. 1 (C),
- the distribution of the voltage drop in> indicates a large voltage drop overall due to the influence of wiring resistance due to the routing from the FPC to the bottom of the screen. Therefore, the gradient of the voltage distribution in the pixel unit 101 is smaller than in the case where the current is simply supplied from the current supply lines routed both above and below the pixel unit, and the voltage drop occurring in the plane is canceled out and averaged. I can do it.
- the gradient of the voltage drop from the first current supply path 102 to the center of the pixel unit differs from that of the voltage drop from the second current supply circuit to the center of the pixel unit. Since the voltage drop occurring in the pixel portion 101 is more canceled out, the gradient of the voltage distribution in the pixel portion 101 becomes smaller.
- FIG. 3A shows a power supply and the like external to the display device.
- a single drive power supply 304 is provided, and the switch 305 connects to the current supply path.
- a plurality of drive power supplies 311 and 312 may be provided, and a switch 313 may be used to switch the connection and cutoff of the current supply path to each other. good.
- FIGS. 2 (A)-(C) show the voltage drop of the Anode potential when the pixel section is assumed to be 320 (horizontal) and 240 (QVGA) vertically and the entire pixel section emits light.
- the back side corresponds to the upper end of the screen, and the near side corresponds to the lower end of the screen.
- Figure 2 (A) shows the voltage distribution during the period when current is supplied from the first current supply path
- Figure 2 (B) shows the voltage distribution during the period when current is supplied from the second current supply path.
- FIG. 2 (C) shows the voltage distribution when both are averaged.
- FIG. 2 (A) a potential difference of about 0.13 V is generated between the upper right and upper left portions of the screen where the voltage drop is the smallest and the center lower end of the screen where the voltage drop is the largest.
- the current supply path from the upper part of the pixel unit becomes dominant due to the wiring resistance, and the current supply path from the lower part of the pixel unit provides a sufficient current supply. Since it does not serve as a path, a voltage distribution similar to that in Fig. 2 (A) appears.
- FIG. 2B a potential difference of about 0.08 V is generated between the lower right and lower left portions of the screen where the voltage drop is the smallest and the upper end of the center of the screen where the voltage drop is the largest.
- the voltage gradient over the entire screen is about IV overall compared to Fig. 2 (A), where the effect of the voltage drop due to the routing around the force is almost flat compared to Fig. 2 (A).
- the potential is getting lower.
- FIG. 2 (C) shows that the first current supply path and the second current supply path are switched over time to supply a current to the pixel portion, and both are averaged.
- the potential difference between the upper right and upper left parts of the screen where the voltage drop is the smallest and the central part of the screen where the voltage drop is the smallest is about 0.08 V compared to the initial figure 2 (A).
- the difference is narrowing.
- the gradient in the plane is large in a relatively flat area.
- the voltage distribution in the pixel portion can be made flatter, and as a result, the VGS change of the driving TFT can be reduced, so that the in-plane luminance distribution can be reduced. come.
- each current supply path can be used independently. Therefore, it is possible to average the gradient of the voltage drop such that the current value and the voltage drop in one current supply path do not affect the current value and the voltage drop in the other current supply path.
- the present invention greatly contributes to the improvement of the image quality of a large-screen, high-definition active matrix display device because the voltage drop has a greater effect as the current consumption increases.
- FIG. 1 is a diagram showing an embodiment of the present invention.
- FIG. 2 is a view showing a simulation result regarding a voltage drop of a pixel portion.
- FIG. 3 is a diagram showing one embodiment of the present invention.
- FIG. 4 is a diagram showing a configuration of an active matrix display device and a configuration of a pixel portion.
- FIG. 5 is a diagram showing a voltage drop in a pixel portion and an operation state of an EL element. Explanation of symbols
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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)
- Control Of El Displays (AREA)
- Electroluminescent Light Sources (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020067000370A KR101115295B1 (ko) | 2003-07-08 | 2004-06-30 | 표시장치 및 그 구동방법 |
CN2004800193649A CN1816836B (zh) | 2003-07-08 | 2004-06-30 | 显示装置及其驱动方法 |
JP2005511337A JP4652233B2 (ja) | 2003-07-08 | 2004-06-30 | アクティブマトリクス型表示装置 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003272021 | 2003-07-08 | ||
JP2003-272021 | 2003-07-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005004096A1 true WO2005004096A1 (ja) | 2005-01-13 |
Family
ID=33562691
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/009176 WO2005004096A1 (ja) | 2003-07-08 | 2004-06-30 | 表示装置およびその駆動方法 |
Country Status (5)
Country | Link |
---|---|
US (1) | US9035855B2 (ja) |
JP (1) | JP4652233B2 (ja) |
KR (1) | KR101115295B1 (ja) |
CN (1) | CN1816836B (ja) |
WO (1) | WO2005004096A1 (ja) |
Cited By (1)
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---|---|---|---|---|
JP2007232796A (ja) * | 2006-02-27 | 2007-09-13 | Hitachi Displays Ltd | 有機el表示装置 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101113451B1 (ko) * | 2009-12-01 | 2012-02-29 | 삼성모바일디스플레이주식회사 | 유기 전계발광 표시장치 |
KR20130092776A (ko) * | 2012-02-13 | 2013-08-21 | 삼성디스플레이 주식회사 | 유기전계발광 표시장치 및 그의 구동방법 |
KR20150069391A (ko) * | 2013-12-13 | 2015-06-23 | 삼성디스플레이 주식회사 | 표시 장치 및 그 구동 방법 |
KR102217385B1 (ko) | 2014-07-18 | 2021-02-19 | 삼성디스플레이 주식회사 | 발광소자 표시장치 |
CN104409046A (zh) | 2014-12-18 | 2015-03-11 | 京东方科技集团股份有限公司 | 显示阵列基板、补偿方法、显示面板和显示装置 |
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2004
- 2004-06-30 WO PCT/JP2004/009176 patent/WO2005004096A1/ja active Application Filing
- 2004-06-30 CN CN2004800193649A patent/CN1816836B/zh not_active Expired - Fee Related
- 2004-06-30 JP JP2005511337A patent/JP4652233B2/ja not_active Expired - Fee Related
- 2004-06-30 KR KR1020067000370A patent/KR101115295B1/ko active IP Right Grant
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JP2007232796A (ja) * | 2006-02-27 | 2007-09-13 | Hitachi Displays Ltd | 有機el表示装置 |
Also Published As
Publication number | Publication date |
---|---|
US20050219164A1 (en) | 2005-10-06 |
JPWO2005004096A1 (ja) | 2006-08-17 |
KR20060040658A (ko) | 2006-05-10 |
CN1816836B (zh) | 2011-09-07 |
KR101115295B1 (ko) | 2012-03-13 |
CN1816836A (zh) | 2006-08-09 |
US9035855B2 (en) | 2015-05-19 |
JP4652233B2 (ja) | 2011-03-16 |
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