GB2364593A - Pixel driver for an organic electroluminescent device - Google Patents
Pixel driver for an organic electroluminescent device Download PDFInfo
- Publication number
- GB2364593A GB2364593A GB0016816A GB0016816A GB2364593A GB 2364593 A GB2364593 A GB 2364593A GB 0016816 A GB0016816 A GB 0016816A GB 0016816 A GB0016816 A GB 0016816A GB 2364593 A GB2364593 A GB 2364593A
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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
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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
- 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
- G09G3/3241—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 the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror
- G09G3/325—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 the current through the light-emitting element being set using a data current provided by the data driver, e.g. by using a two-transistor current mirror the data current flowing through the driving transistor during a setting phase, e.g. by using a switch for connecting the driving transistor to the data driver
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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
- 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
- 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
- G09G2300/0861—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor with additional control of the display period without amending the charge stored in a pixel memory, e.g. by means of additional select electrodes
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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)
Abstract
A compensated pixel driver circuit for an organic electroluminescent device, the circuit comprising; a transistor connected so as operatively to control the current supplied to the electroluminescent device, a capacitor connected for storing an operating voltage of the transistor during a programming stage, a first switching means connected so as to establish when operative a current path through the transistor during the programming stage, and a second switching means connected so as to establish when operative a current path though the transistor and the electroluminescent device during a reproduction stage, wherein the first switching means is connected such that the current path during the programming stage does not pass through the electroluminescent device. No current is applied to the electroluminescent device by the current controlling transistor during the programming stage and thus the overall power consumption is reduced. Furthermore, the circuit can be operated from a normal supply voltage rather than requiring a high bias voltage. During the programming stage, the circuit uses a current sink rather than a current source.
Description
2364593 Organic ElectroLuminescent Device Compensated Pixel Driver Circuit
The present invention relates to an organic electroluminescent device and particularly to a compensated pixel driver circuit thereof An organic electro-luminescent device (OELD) consists of a light emitting polymer (LEP) layer sandwiched between an anode layer and a cathode layer. Electrically, this device operates like a diode. Optically, it emits light when forward biased and the intensity of the emission increases with the forward bias current. It is possible to construct a display panel with a matrix of OELDs fabricated on a transparent substrate and with one of the electrode layers being transparent. One can also integrate the driving circuit on the same panel by using low temperature polysilicon thin film transistor (TFT) technology.
In a basic analog driving scheme for an active matrix OELD display, a minimum of two transistors are required per pixel (Figure 1): T, is for addressing the pixel and T 2 is for converting the data voltage signal into current which drives the OELD at a designated brightness. The data signal is stored by the storage capacitor Cstorage when the pixel is not addressed. Although p-channel TFTs are shown in the figures, the same principle can also be applied for a circuit with n-channel TFTs- There are problems associated with TFT analog circuits and OELDs do not act like perfect diodes. The LEP material does, however, have relatively uniform characteristics. Due to the nature of the TFT fabrication technique, spatial variation of the TFT characteristics exists over the entire panel. One of the most important considerations in a TFT analog circuit is the variation of threshold voltage, AVT, from device to device. The effect of such variation in an OELD display, exacerbated by the non perfect diode behaviour, is the non-uniform pixel brightness over the display panel, which seriously affects the image quality. Therefore, a built-in compensation circuit is required.
A simple threshold voltage variation compensation, current driven, circuit has been proposed. The current driven circuit, also known as the current programmed threshold voltage compensation circuit is illustrated in figure 2. In this circuit, Tj is for addressing the pixel. T2 operates as an analog current control to provide the driving current. T3 connects between the drain and gate of T2 and toggles T2 to be either a diode or in saturation. T4 acts as a switch. Either Tj or T4 can be ON at any one time. Initially, Tj and T3 are OFF, and T4 is ON. When T4 is OFF, Tj and T3 are ON, and a current of known value is allowed to flow into the OELD, through T2. This is the programming stage because the threshold voltage of T2 is measured with T2 operating as a diode (with T3 turned ON) while the programming current is allowed to flow through T1, through T2 and into the OELD. T3 shorts the drain and gate of T2 and turns T2 in to a diode. The detected threshold voltage of T2. is stored by the capacitor C I connected between the gate and source terminals of T2 when T3 and T I are switched OFF. Then T4 is turned ON, the current is now provided by VDD- If the slope of the output characteristics were flat, the reproduced current would be the same as the programmed current for any threshold voltage of T2 detected. By turning ON T4, the drain-source voltage of T2 is pulled up, so a flat output characteristic will keep the reproduced current the same as the programmed current. Note that AVT2 shown in figure 2 is imaginary, not real.
A constant current is provided, in theory, during the active programming stage, which is t2 to t5 in the timing diagram shown in figure 2. The reproduction stage starts at t6- The circuit of figure 2 is advantageous but there is an on-going desire to reduce power consumption. In particular, implementation of the current- source in the circuit of figure 2 3 requires a bias voltage (VBIAS) in addition to the supply voltage (VDD). Although the supply voltage (VDD) could be increased to cover the required bias voltage (VBIAS) - Which would have the advantage of reducing the component count, there is still an overall increase in system power consumption to program with any value of data current (IDAT).
According to a first aspect of the present invention there is provided a compensated pixel driver circuit for an organic electroluminescent device, the circuit comprising; a transistor connected so as operatively to control the current supplied to the electroluminescent device, a capacitor connected for storing an operating voltage of the transistor during a programming stage, a first switching means connected so as to establish when operative a current path through the transistor during the programming stage, and a second switching means connected so as to establish when operative a current path through the transistor and the electroluniinescent device during a reproduction stage, wherein the first switching means is connected such that the current path during the programming stage does not pass through the electroluminescent device.
According to a second aspect of the present invention there is provided a compensated pixel driver circuit for an organic electroluminescent device, the circuit comprising; a transistor connected so as operatively to control the current supplied to the electroluminescent device, a capacitor connected for storing an operating voltage of the transistor during a programming stage, a first switching means connected so as to establish when operative a current path through the transistor during the programming stage, a second switching means connected so as to establish when operative a current path through the transistor and the electroluminescent device during a reproduction stage, and a current sink, the first switching means being connected such that the current path during the programming stage is through the transistor to the current sink.
According to a third aspect of the present invention there is provided a method of compensating the current supply to an organic electroluminescent pixel comprising the steps of providing a current path during a programming stage which path does not pass through the electroluminescent device and of providing a current path during a reproduction stage which path does pass through the electroluminescent device.
According to a fourth aspect of the present invention there is provided a method of compensating the current supply to an organic electroluminescent pixel comprising the steps of providing a current path during a prograniming stage which path connects to a current sink and of providing a current path during a reproduction stage which path passes through the electroluminescent device.
It will be noted that according to the present invention no current is applied to the electroluminescent device by the current controlling transistor during the programming stage. In accordance with the invention this can be implemented without degrading the perceived image presented by the electroluminescent device. It has the benefit of reducing the overall power consurnption compared with the prior art in which the same current is supplied to the OELD during both the programming and the reproduction stage. Furthermore, the circuit can be operated from a normal supply voltage rather than requiring a high bias voltage as in the prior art. In effect, the present invention provides for separation of the programming and the reproduction current paths.
Embodiments of the present invention will now be described by way of example only and with reference to the accompanying drawings, in which:Figure I shows a conventional OELD pixel driver circuit using two transistors, Figure 2 shows a known current programmed OELD driver with threshold voltage compensation, Figure 3 shows a compensated pixel driver circuit according to a first embodiment of the present invention, Figure 4 shows a compensated pixel driver circuit according to a second embodiment of the present invention, Figure 5 shows several pixels in a matrix display wherein each pixel uses the circuit of figure 4.
A compensated pixel driver circuit according to a first embodiment of the present invention is shown in figure 3. As in the circuit of figure 2, transistor T2 operates as an analog current control to provide the driving current to the OELD. Also, the storage capacitor Cl is connected between the gate and the source of transistor T2- In the circuit of figure 2, a current source is operatively connected to the source of transistor T2 by transistor Tl, during the programming stage, and current is thus applied to the OELD. In the embodiment of the present invention, transistor Tj operatively connects transistor T2 to a current sink during the programming stage. That is, according to the present invention, during the programming stage no current is supplied through transistor T2 to the OELD. In the circuit of figure 3, the drain of transistor T2 is connected to the source of transistor T I via the source/drain path of transistor T3. The source of transistor Tj is connected to the gate of transistor T2 and the gates of transistors Tj and T3 are connected together. The programming voltage Vp is applied to the gates of T I and T3. Transistor T4, which is switched off during the programming stage, connects the drain of T2 and the source of T3 to the OELD. During the programming stage, transistor Tl operatively connects transistor T2 to a current sink which is tied to ground or a reference voltage.
The circuit of figure 3 operates in the programming stage with T4 switched off and Tj and T3 switched on. T3 being switched on has the effect of making T2 act as a diode and Tl connects this diode to the data current sink. As a result, capacitor C I charges (or discharges, depending on the voltage stored during the previous frame). Capacitor C I charges to the gate/source voltage of transistor T2 and thus stores the voltage (VGS2, corresponding to the data current IDAT) which will control the current supply to the OELD during the reproduction stage. At the end of the programming stage, Tl and T3 are switched off. The voltage VGS2 is stored on C I for the remainder of the frame period. As will be readily apparent from the circuit diagram and this description, in accordance with the present invention there is no requirement for a bias voltage to provide a current source. That is, the supply voltage (VDD) in figure 3 is determined by T2 and by the OELD and there is no requirement for a high voltage to power a current source. The maximum voltage required by the circuit is thus significantly less than that required by the circuit of figure 2.
At the start of the programming stage, with T4 switched off, it is found that the OELD exhibits a parasitic capacitance which discharges through the device. The rate of charging of Cl determines the time taken for the programming stage. In accordance with circuits embodying the present invention, the capacitance of C I can be relatively small and thus the charging can be very rapid. As a consequence, the period for which no current is applied to the OELD by T2 is very short compared with the whole frame. These factors, together with the persistence of vision of the human eye means that there is no perceptible degradation of a displayed image.
The off resistance of T3 can be important, because after C I has been charged and T3 is switched off, the off resistance of T3 can affect the voltage across Cl for the rest of the frame period. Thus, the gate/source capacitance of T3 should preferably be small compared with C 1.
The reproduction voltage VR is applied to the gate of transistor T4. At the beginning of the reproduction stage, in the circuit of figure 3, T4 is switched on and Tl and T3 remain switched off. As a result, T2 acts as a current source with VGS2 biased by C 1, thus supplying current to the OELD. At the end of the reproduction stage T4 is switched off, Tj and T3 remain switched off, This completes one cycle. As indicated in figure 3, the driving waveform is the same as that used with the circuit of figure 2.
Figure 4 illustrates a second embodiment according to the present invention. The circuit of figure 4 differs from that of figure 3 only in the connection of transistor T3. In the circuit of figure 4, instead of the source of T3 being connected to the drain of T2 it is connected to the gate of T2. That is, Tj is connected to Cl through the drain/source path of T3. The circuit of figure 4 is preferred to that of figure 3 because T3 is not in the current path during the programming stage.
Otherwise the operation and effects of the second embodiment are the same as those of the first embodiment.
Figure 5 is a circuit diagram showing a number of pixels in an active matrix display, with each pixel implemented in accordance with the circuit of figure 4. To simplify the illustration, a monochrome display device is shown. Since the circuit is of an active matrix, pixels on the same row are addressed at the same time. Transistor T3 is responsible for pixel addressing, so its source terminal is connected to the current data line shared by a column of pixels. Because of this the leakage current of T3 should be kept to a minimum. This can be ensured by using a multi-gate structure for T1.
Preferably the circuits shown in figures 3 to 5 are implemented using thin film transistor (TFT) technology, most preferably in polysilicon.
The present invention is particularly advantageous for use in small, mobile electronic products such as mobile phones, computers, CD players, DVD players and the like - although it is not limited thereto.
It will be apparent to persons skilled in the art that variations and modifications can be made to the arrangements described with respect to figure 3 to 5 without departing from the scope of the invention.
9
Claims (9)
1. A compensated pixel driver circuit for an organic electroluminescent device, the circuit comprising; a transistor connected so as operatively to control the current supplied to the electroluminescent device, a capacitor connected for storing an operating voltage of the transistor during a programming stage, a first switching means connected so as to establish when operative a current path through the transistor during the programming stage, and a second switching means connected so as to establish when operative a current path through the transistor and the electroluminescent device during a reproduction stage, wherein the first switching means is connected such that the current path during the programming stage does not pass through the electroluminescent device.
2. A compensated pixel driver circuit for an organic electroluminescent device, the circuit comprising; a transistor connected so as operatively to control the current supplied to the electroluminescent device, a capacitor connected for storing an operating voltage of the transistor during a programming stage, a first switching means connected so as to establish when operative a current path through the transistor during the programming stage, a second switching means connected so as to establish when operative a current path through the transistor and the electroluminescent device during a reproduction stage, and a current sink, the first switching means being connected such that the current path during the programming stage is through the transistor to the current sink.
3. A compensated pixel driver circuit as claimed in claim 1 or claim 2, further comprising a third switching means, the t1iird. switching means being connected to bias the transistor to act as a diode during the programming stage.
4. A compensated pixel driver circuit as claimed in claim 3, wherein the third switching means connects the first switching means to the source/drain current path of the transistor.
5. A compensated pixel driver circuit as claimed in claim 3, wherein the third switching means connects the first switching means to the gate of the transistor.
6. A compensated pixel driver circuit as claimed in any preceding claim, wherein the circuit is implemented with polysilicon thin film transistors.
7. A method of compensating the current supply to an organic electroluminescent pixel comprising the steps of providing a current path during a programming stage which path does not pass through the electroluminescent device and of providing a current path during a reproduction stage which path does pass through the electroluminescent device.
8. A method of compensating the current supply to an organic electroluminescent pixel comprising the steps of providing a current path during a programming stage which path connects to a current sink and of providing a current path during a reproduction stage which path passes through the electroluminescent device.
0 11
9. An organic electroluminescent display device comprising one or more compensated pixel driver circuits as claimed in any of claims I to 6.
Priority Applications (16)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100713457A CN100511369C (en) | 2000-07-07 | 2001-07-09 | Current sampling circuit for organic electroluminescent display |
| DE60142321T DE60142321D1 (en) | 2000-07-07 | 2001-07-09 | Current sensing circuit for organic electroluminescent display |
| US09/899,915 US6943759B2 (en) | 2000-07-07 | 2001-07-09 | Circuit, driver circuit, organic electroluminescent display device electro-optical device, electronic apparatus, method of controlling the current supply to an organic electroluminescent pixel, and method for driving a circuit |
| EP01305898A EP1170718B1 (en) | 2000-07-07 | 2001-07-09 | Current sampling circuit for organic electroluminescent display |
| TW092116279A TWI312979B (en) | 2000-07-07 | 2001-07-09 | Driver circuit, electro-optical device and electronic apparatus |
| TW090116781A TWI292143B (en) | 2000-07-07 | 2001-07-09 | Circuit, driver circuit, organic electroluminescent display device electro-optical device, electronic apparatus, method of controlling the current supply to an organic electroluminescent pixel, and method for driving a circuit |
| CNA2006101016248A CN1892774A (en) | 2000-07-07 | 2001-07-09 | Current sampling circuit for organic electroluminescent display |
| AT01305898T ATE470923T1 (en) | 2000-07-07 | 2001-07-09 | CURRENT SENSING CIRCUIT FOR ORGANIC ELECTROLUMINESCENCE DISPLAY |
| CNB018025323A CN1210684C (en) | 2000-07-07 | 2001-07-09 | Current sampling circuit for organic electroluminescent display |
| CNB2005100713461A CN100511370C (en) | 2000-07-07 | 2001-07-09 | Current sampling circuit for organic electroluminescent display |
| KR1020027003032A KR20020032570A (en) | 2000-07-07 | 2001-07-09 | Current sampling circuit for organic electroluminescent display |
| TW092116283A TWI311739B (en) | 2000-07-07 | 2001-07-09 | Driver circuit, electro-optical device and electronic apparatus |
| KR1020057010015A KR100603804B1 (en) | 2000-07-07 | 2001-07-09 | Current sampling circuit for organic electroluminescent display |
| KR1020057010013A KR100568016B1 (en) | 2000-07-07 | 2001-07-09 | Current sampling circuit for organic electroluminescent display |
| PCT/GB2001/003085 WO2002005254A1 (en) | 2000-07-07 | 2001-07-09 | Current sampling circuit for organic electroluminescent display |
| US10/853,254 US20050024298A1 (en) | 2000-07-07 | 2004-05-26 | Circuit, driver circuit, organic electroluminescent display device electro-optical device, electronic apparatus, method of controlling the current supply to an organic electroluminescent pixel, and method for driving a circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB0007879A GB2360870A (en) | 2000-03-31 | 2000-03-31 | Driver circuit for organic electroluminescent device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB0016816D0 GB0016816D0 (en) | 2000-08-30 |
| GB2364593A true GB2364593A (en) | 2002-01-30 |
Family
ID=9888880
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0007879A Withdrawn GB2360870A (en) | 2000-03-31 | 2000-03-31 | Driver circuit for organic electroluminescent device |
| GB0016816A Withdrawn GB2364593A (en) | 2000-03-31 | 2000-07-07 | Pixel driver for an organic electroluminescent device |
| GB0016815A Withdrawn GB2364592A (en) | 2000-03-31 | 2000-07-07 | Pixel driver for an organic electroluminescent device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0007879A Withdrawn GB2360870A (en) | 2000-03-31 | 2000-03-31 | Driver circuit for organic electroluminescent device |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB0016815A Withdrawn GB2364592A (en) | 2000-03-31 | 2000-07-07 | Pixel driver for an organic electroluminescent device |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR100493555B1 (en) |
| GB (3) | GB2360870A (en) |
| WO (1) | WO2001075853A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7112927B2 (en) | 2002-09-05 | 2006-09-26 | Semiconductor Energy Laboratory Co., Ltd. | Light emitting device and driving method thereof |
| US7345657B2 (en) | 2002-12-27 | 2008-03-18 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device and display device utilizing the same |
| US7352133B2 (en) | 2002-08-05 | 2008-04-01 | Semiconductor Energy Laboratory Co., Ltd. | Light emitting device |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SG114502A1 (en) | 2000-10-24 | 2005-09-28 | Semiconductor Energy Lab | Light emitting device and method of driving the same |
| JP2003043998A (en) * | 2001-07-30 | 2003-02-14 | Pioneer Electronic Corp | Display device |
| GB2381643A (en) | 2001-10-31 | 2003-05-07 | Cambridge Display Tech Ltd | Display drivers |
| US7483001B2 (en) | 2001-11-21 | 2009-01-27 | Seiko Epson Corporation | Active matrix substrate, electro-optical device, and electronic device |
| GB2384100B (en) * | 2002-01-09 | 2005-10-26 | Seiko Epson Corp | An electronic circuit for controlling the current supply to an element |
| KR100445433B1 (en) * | 2002-03-21 | 2004-08-21 | 삼성에스디아이 주식회사 | Organic electroluminescent display and driving method and apparatus thereof |
| JP4046015B2 (en) * | 2002-06-07 | 2008-02-13 | セイコーエプソン株式会社 | Electronic circuit, electronic device, electro-optical device, and electronic apparatus |
| GB2389951A (en) * | 2002-06-18 | 2003-12-24 | Cambridge Display Tech Ltd | Display driver circuits for active matrix OLED displays |
| GB2389952A (en) | 2002-06-18 | 2003-12-24 | Cambridge Display Tech Ltd | Driver circuits for electroluminescent displays with reduced power consumption |
| KR100967191B1 (en) | 2002-06-18 | 2010-07-05 | 캠브리지 디스플레이 테크놀로지 리미티드 | Display driver circuits |
| KR100517664B1 (en) * | 2002-08-30 | 2005-09-28 | 인더스트리얼 테크놀로지 리써치 인스티튜트 | Active matrix led pixel driving circuit |
| KR100505370B1 (en) * | 2002-09-19 | 2005-08-03 | 재단법인서울대학교산학협력재단 | Pixel structure for active matrix organic light emitting diode display |
| GB0223305D0 (en) * | 2002-10-08 | 2002-11-13 | Koninkl Philips Electronics Nv | Electroluminescent display devices |
| JP3832415B2 (en) | 2002-10-11 | 2006-10-11 | ソニー株式会社 | Active matrix display device |
| KR100899082B1 (en) * | 2002-12-30 | 2009-05-25 | 매그나칩 반도체 유한회사 | OELD with improved luminescence |
| EP1676257A4 (en) * | 2003-09-23 | 2007-03-14 | Ignis Innovation Inc | Circuit and method for driving an array of light emitting pixels |
| EP1796070A1 (en) | 2005-12-08 | 2007-06-13 | Thomson Licensing | Luminous display and method for controlling the same |
| KR100747491B1 (en) * | 2006-02-20 | 2007-08-08 | 삼성전자주식회사 | Display device |
| CN106960659B (en) * | 2017-04-28 | 2019-09-27 | 深圳市华星光电半导体显示技术有限公司 | Display panel, pixel-driving circuit and its driving method |
| CN110751926B (en) * | 2019-10-31 | 2021-12-28 | 武汉天马微电子有限公司 | Display panel and display device |
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| WO1999065012A2 (en) * | 1998-06-12 | 1999-12-16 | Koninklijke Philips Electronics N.V. | Active matrix electroluminescent display devices |
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| US5714968A (en) * | 1994-08-09 | 1998-02-03 | Nec Corporation | Current-dependent light-emitting element drive circuit for use in active matrix display device |
| US6462722B1 (en) * | 1997-02-17 | 2002-10-08 | Seiko Epson Corporation | Current-driven light-emitting display apparatus and method of producing the same |
| EP0895219B1 (en) * | 1997-02-17 | 2010-06-16 | Seiko Epson Corporation | Display device |
| WO1998040871A1 (en) * | 1997-03-12 | 1998-09-17 | Seiko Epson Corporation | Pixel circuit, display device and electronic equipment having current-driven light-emitting device |
| EP0978114A4 (en) * | 1997-04-23 | 2003-03-19 | Sarnoff Corp | Active matrix light emitting diode pixel structure and method |
| WO1999052095A1 (en) * | 1998-04-03 | 1999-10-14 | Fed Corporation | Improved pixel driver for accurate and finer gray scale resolution |
| JPH11327506A (en) * | 1998-05-13 | 1999-11-26 | Futaba Corp | Driving circuit for el display device |
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- 2000-03-31 GB GB0007879A patent/GB2360870A/en not_active Withdrawn
- 2000-07-07 GB GB0016816A patent/GB2364593A/en not_active Withdrawn
- 2000-07-07 GB GB0016815A patent/GB2364592A/en not_active Withdrawn
-
2001
- 2001-03-30 WO PCT/GB2001/001460 patent/WO2001075853A1/en active Application Filing
- 2001-07-09 KR KR10-2002-7003033A patent/KR100493555B1/en active IP Right Grant
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| US5952789A (en) * | 1997-04-14 | 1999-09-14 | Sarnoff Corporation | Active matrix organic light emitting diode (amoled) display pixel structure and data load/illuminate circuit therefor |
| WO1999065012A2 (en) * | 1998-06-12 | 1999-12-16 | Koninklijke Philips Electronics N.V. | Active matrix electroluminescent display devices |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7352133B2 (en) | 2002-08-05 | 2008-04-01 | Semiconductor Energy Laboratory Co., Ltd. | Light emitting device |
| US9613565B2 (en) | 2002-08-05 | 2017-04-04 | Semiconductor Energy Laboratory Co., Ltd. | Light emitting device |
| US7112927B2 (en) | 2002-09-05 | 2006-09-26 | Semiconductor Energy Laboratory Co., Ltd. | Light emitting device and driving method thereof |
| US7796099B2 (en) | 2002-09-05 | 2010-09-14 | Semiconductor Energy Laboratory Co., Ltd. | Light emitting device and driving method thereof |
| US8248330B2 (en) | 2002-09-05 | 2012-08-21 | Semiconductor Energy Laboratory Co., Ltd. | Light emitting device and driving method thereof |
| US7345657B2 (en) | 2002-12-27 | 2008-03-18 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device and display device utilizing the same |
| US7940239B2 (en) | 2002-12-27 | 2011-05-10 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device and display device utilizing the same |
| US8866714B2 (en) | 2002-12-27 | 2014-10-21 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device and display device utilizing the same |
| US9620060B2 (en) | 2002-12-27 | 2017-04-11 | Semiconductor Energy Laboratory Co., Ltd. | Semiconductor device including transistors, switches and capacitor, and electronic device utilizing the same |
Also Published As
| Publication number | Publication date |
|---|---|
| GB0016815D0 (en) | 2000-08-30 |
| KR20020032571A (en) | 2002-05-03 |
| GB0016816D0 (en) | 2000-08-30 |
| GB2360870A (en) | 2001-10-03 |
| KR100493555B1 (en) | 2005-06-10 |
| GB2364592A (en) | 2002-01-30 |
| WO2001075853A1 (en) | 2001-10-11 |
| GB0007879D0 (en) | 2000-05-17 |
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