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Pixel circuit and display device

A pixel circuit and current technology, which is applied in the field of display devices, can solve problems such as high requirements for driver ICs and complex pixel layout wiring, and achieve the effects of compensating uneven brightness, reducing complexity and cost, and increasing aperture ratio

Active Publication Date: 2013-10-30
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many voltage-driven pixel circuits introduce multiple control signals and a relatively complicated programming process when compensating for the inconsistency of the threshold voltage, which makes the circuit have higher requirements for the external driver IC, and the layout and wiring of the pixel also become complicated.

Method used

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  • Pixel circuit and display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] like figure 2 The pixel circuit shown includes: power supply line V DD , data line V DATA , the first transistor T1, the second transistor T2, the third transistor T3, the fourth transistor T4 and the capacitor CS .

[0050] The scan line of the row where the pixel circuit is located is called the gate scan line V of the row. N , N is a natural number; the scan line of the previous row of the row where the pixel circuit is located is called the gate scan line V of the previous row N-1 .

[0051] power line V DD It is used to provide power for the pixel circuit. In each embodiment herein, the power line provides a high-level constant-voltage power supply.

[0052] In the embodiment, the light-emitting device is an organic light-emitting diode (OLED) as an example for illustration.

[0053] The first transistor T1, the second transistor T2, the third transistor T3 and the fourth transistor T4, these four transistors in the embodiment are N-channel thin film transis...

Embodiment 2

[0074] like Figure 3a As shown, the difference between Embodiment 2 and Embodiment 1 is that the first power supply is the anode voltage of the OLED, that is, the capacitor C s The second electrode is connected to the anode of the OLED.

[0075] The working process of the circuit in the second embodiment is the same as that in the first embodiment, and will not be repeated here.

Embodiment 3

[0077] like Figure 3b As shown, the difference between the third embodiment and the first embodiment is that the first power supply is the power line V DD , that is, at this time the capacitance C s The second electrode of the power line V DD connected.

[0078] The working process of the circuit in the third embodiment is the same as that in the first embodiment, and will not be repeated here.

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Abstract

The invention provides a pixel circuit and a display device. The pixel circuit comprises a power wire, a capacitor, a first transistor, a second transistor, a third transistor and a fourth transistor, wherein the power wire is used for supplying power, the first transistor is used for driving a light-emitting device to emit light, the second transistor and the first transistor are formed into a mirror structure, and the fourth transistor is used for sampling the data signals supplied by a data wire. The invention only utilizes the simple structure comprising the four transistors to generate and eliminate the threshold voltage information of a TFT (thin film transistor) in order to provide stable output current, thus effectively improving the problem that the ununiformity of the threshold voltage of the polycrystalline silicon TFT panel causes the ununiformity of the brightness of the OLED (organic light-emitting diode) light-emitting device; and furthermore, because the raster scanning signals of the pixel circuit are obtained from previous and next levels of pixels, additional scanning lines can be prevented, and the complexity of a peripheral driving IC (integrated circuit) can be prevented from being increased.

Description

technical field [0001] The invention relates to the technical field of display devices, in particular to an OLED display device and a pixel circuit thereof. Background technique [0002] Organic Light-Emitting Diode (OLED: Organic Light-Emitting Diode) display has been extensively studied in recent years due to its advantages of high brightness, high luminous efficiency, wide viewing angle, and low manufacturing cost, and has been rapidly applied to a new generation of displays. OLED displays can be driven by pixels in two ways: PMOLED (PassiveMatrix OLED: Passive Matrix OLED) and AMOLED (Active Matrix OLED: Active Matrix OLED). Due to the shortcomings of crosstalk, large driving current, and high power consumption, passive matrix drivers cannot realize large-area displays. In contrast, active-matrix drives avoid problems such as duty cycle and crosstalk, require less drive current, lower power consumption, and thus have a longer life. At the same time, active matrix drive...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32G09G3/3225
Inventor 王龙彦张盛东梁逸南廖聪维
Owner BOE TECH GRP CO LTD