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Pixel device, driving method of pixel device, and display device

A pixel and drive transistor technology, applied in the field of pixel devices and display equipment, can solve the problems of large number of MOS transistors, small data voltage range, OLED aging, etc., achieve good threshold voltage non-uniformity, expand data voltage range, and delay aging Effect

Active Publication Date: 2020-05-26
PEKING UNIV SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In a traditional technology, the micro-display pixel circuit structure of the self-discharge compensation method can be used, that is, the self-discharge path is formed by using the load capacitor and the storage capacitor connected between the gate and source of the drive transistor, and the threshold voltage of the drive transistor Information is stored at both ends of the storage capacitor; during the light-emitting phase, the threshold voltage information stored at both ends of the storage capacitor is offset, so that the non-uniformity of the threshold voltage of the drive transistor can be compensated; but its data voltage range is too small to accurately control the OLED The tiny current corresponding to each gray scale
Although four NMOS drive transistors in series can be used to expand the data voltage range, but the circuit contains a large number of MOS transistors, which is not conducive to the realization of higher resolution microdisplays
[0011] In addition, the electrical and optical properties of OLEDs will change after a long time of work, resulting in OLED aging phenomena. It is manifested that under the same driving current, the turn-on voltage of OLEDs will gradually increase, and the luminous efficiency will gradually decrease, resulting in display screens There are problems such as uneven brightness or a decrease in luminous brightness

Method used

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  • Pixel device, driving method of pixel device, and display device
  • Pixel device, driving method of pixel device, and display device
  • Pixel device, driving method of pixel device, and display device

Examples

Experimental program
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Effect test

Embodiment 1

[0058] image 3 It is a schematic diagram of a pixel circuit according to a first embodiment of the present invention.

[0059] Such as image 3 As shown, the pixel circuit includes a driving transistor 30, a first switching transistor 31, a second switching transistor 32, a third switching transistor 33, a fourth switching transistor 34, a light emitting device 35, a first capacitor 36 and a second capacitor 37.

[0060] The first pole of the driving transistor 30 is coupled to the first electrode to receive the first common potential signal VDD, the second pole is coupled to the anode of the light emitting device 35 , and the control pole is coupled to the first pole of the first switching transistor 31 . The second pole of the first switching transistor 31 is coupled to the data signal line DATA to receive the data voltage V DATA , the control electrode is used to receive the first scanning signal SCAN1. The first pole of the second switching transistor 32 is coupled to ...

Embodiment 6

[0128] Figure 13 It is a schematic diagram of a pixel circuit according to a sixth embodiment of the present invention, Figure 14 It is a signal timing diagram of the pixel circuit of the sixth embodiment of the present invention.

[0129] Figure 13 The cathode of the light emitting device 35 in the pixel circuit in the pixel circuit receives the second common potential VSS; the first pole of the fourth switching transistor 34 is coupled to the second pole of the driving transistor 30, and the second pole of the fourth switching transistor 34 is coupled to the light emitting device 35, the control pole is used to receive the fourth scan signal SCAN4.

[0130] Similarly, the pixel circuit driving process also includes an initialization phase, a threshold voltage extraction phase, a data voltage writing phase and a light emitting phase. Combine below Figure 13 , 14 The driving process of the pixel circuit is described.

[0131] In this embodiment, the reference potenti...

Embodiment 7

[0137] Figure 15 It is a schematic diagram of a pixel circuit according to a seventh embodiment of the present invention, Figure 16 It is a timing diagram of the pixel circuit of the seventh embodiment of the present invention.

[0138] Unlike other examples, Figure 15 The first common potential VDD in the pixel circuit in the initialization and light-emitting phase is a high potential V H , it is a low potential V during the threshold voltage extraction and data voltage writing stages L To prevent the driving current from flowing through the light emitting device. The cathode of the light emitting device 35 is used to receive the second common signal V SS .

[0139] During the initialization phase, the reference potential V on the data signal line REF greater than or equal to V TH30 +V 35,open +V SS , where V SS is the reference potential of the second electrode VSS.

[0140] In the initialization phase T1, the first electrode VDD of the pixel circuit is at a hi...

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PUM

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Abstract

The invention relates to a pixel device, a driving method of the pixel device, and a display device. The pixel device includes a luminescent device, a driving transistor which is used to drive the luminescent device, a first transistor, and a boost memory unit, wherein a first pole of the driving transistor is coupled to a first common potential and a second pole of the driving transistor is coupled to an anode of the luminescent device; a control pole of the first transistor is used for receiving a first switching signal; a first pole of the first transistor is coupled to a control pole of the driving transistor, and a second pole of the first transistor is used for receiving data voltage information; the boost memory unit is coupled to the control pole and the second pole of the drivingtransistor, and includes a first capacitive element and a second capacitive element; the first capacitive element and the second capacitive element are used for storing threshold-voltage information and data voltage information of the driving transistor; and when the first transistor is cut-off, the voltage on the first capacitive element is used for driving the driving transistor. The technical scheme of the pixel device can improve the data voltage range so as to conveniently control the current of a luminescent element.

Description

technical field [0001] The present invention relates to the field of integrated circuits, in particular to a pixel device, a method for driving the pixel device and a display device. Background technique [0002] As an important branch of display technology, microdisplay is widely used in the field of near-eye display, such as virtual reality (Virtual Reality, VR) and augmented reality (Augmented Reality, AR). At present, the most mainstream micro-display technologies include: Organic Light-Emitting Diode-on Silicon (OLEDoS), Liquid Crystal on Silicon (LCoS) and micro LED (inorganic) display technologies. [0003] The main disadvantage of the display using LCoS is that the operating temperature range is narrow (typical value 0 ~ 45 ℃), and it requires a built-in backlight source, and the display contrast is low. OLED is an all-solid-state active light-emitting device with a wide operating temperature range (typically 40-70°C) and can achieve high contrast. Micro-LED displa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3208
CPCG09G3/3208
Inventor 张盛东霍新新廖聪维吴继祥王莹易水平
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL