Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Pixel circuit, display device and display driving method

A technology of pixel circuit and display device, applied in the field of display device and display driver, pixel circuit, can solve the problems of complex circuit structure, reduction of pixel aperture ratio, increase of line cost, etc., to achieve fast data input, reduce production cost, simple circuit effect of structure

Active Publication Date: 2016-03-09
PEKING UNIV SHENZHEN GRADUATE SCHOOL
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many voltage-driven pixel circuits are compensating for the threshold voltage V TH When drifting, a complex circuit structure is required and multiple scanning lines are introduced, which reduces the aperture ratio of the pixel and requires higher requirements for the external gate drive IC, and increases the circuit cost

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Pixel circuit, display device and display driving method
  • Pixel circuit, display device and display driving method
  • Pixel circuit, display device and display driving method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Please refer to figure 2 , figure 2 The structure of the display device according to the first embodiment of the present application is shown, which mainly includes a display panel, a gate driving circuit 52 and a data driving circuit 53 . The display panel includes several pixel arrays 51 . Wherein, the pixel array 51 is composed of N rows and M columns of pixel circuits 56 arranged in a matrix, that is, the pixel array 51 has N rows and M columns, where N and M are both positive integers. Generally, the pixel circuits 56 in the same row in the pixel array 51 are connected to the same scan line 57 , and the pixel circuits 56 in the same column in the pixel array 51 are connected to the same data line 55 and bias current line 54 . The gate driving circuit 52 is used to provide scanning signals to the pixel circuits 56 through the scanning lines 57 . The data driving circuit 53 is used to provide grayscale information to the pixel circuit through the data line 55, t...

Embodiment 2

[0078] Please refer to Figure 6 , the main difference from Embodiment 1 is that in the display device, the gate drive circuit 52 also provides a control line 64 whose level is opposite to that of the scanning line in the data input stage, and the pixel circuit 56 mainly includes: an organic light emitting diode 29 as The light-emitting element, the first capacitor 27, the first transistor 24 provided with the first control electrode, the first electrode and the second electrode as a switch control module, and the second transistor 24 provided with the second control electrode, the third electrode and the fourth electrode The transistor 25 serves as a driving module. For convenience, a storage node 68 (that is, the first terminal of the first capacitor 27 ) is set here. The first control electrode is coupled to the scan line 57, the first electrode is coupled to the bias current line 54, and the bias current line 54 can be switched between the bias current source 47 and the vo...

Embodiment 3

[0098] Please refer to Figure 8 and Figure 9 , the main difference from Embodiment 1 is that in the display device, such as Figure 8 As shown, the data driving circuit 53 also includes a data voltage source composed of an analog-to-digital converter 104, an input buffer 103, an external storage 105, an adder 106, a digital-to-analog converter 107, and an output buffer 108, wherein the analog-to-digital conversion The device 104 is coupled to the output terminal of the bias current source 47 through the input buffer 103, and can complete the coupling and disconnection with the bias current line 54 through the controllable switch 411. The functions of the above-mentioned devices are corresponding in the following display driving process describe. Such as Figure 9 As shown, the pixel circuit 56 mainly includes: an organic light emitting diode 29 as a light emitting element, a second capacitor 26, a first capacitor 27, and a first transistor 24 provided with a first control...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a pixel circuit, a display device and a display displaying method. First threshold voltage information of a second transistor and second threshold voltage information of a light-emitting element are extracted via a current offset manner, and the first threshold voltage information, the second threshold voltage information and grey information of a pixel are taken as reference voltage of a first capacitor. During light-emitting stage, by enabling driving current passing through the light-emitting element to be unrelated to the first threshold voltage information and the second threshold voltage information, non-uniformity of TFT (thin film transistor) devices or OLED (organic light emitting diode) threshold voltage drift or TFT device threshold voltage at positions on a display panel is precisely compensated, the grey information is stored in the first capacitor via a voltage programming mode, quick data input is realized, furthermore, due to a simple circuit structure, an opening rate of a pixel and yield rate of the display device are increased, and product cost is reduced.

Description

technical field [0001] The present application relates to the technical field of display devices, in particular to a pixel circuit, a display device and a display driving method. Background technique [0002] Organic Light-Emitting Diode (OLED) display has been widely studied in recent years due to its advantages of high brightness, high luminous efficiency, wide viewing angle and low power consumption, and has been rapidly applied to a new generation of displays. OLED display can be driven in two ways: passive matrix drive (PassiveMatrixOLED, PMOLED) and active matrix drive (ActiveMatrixOLED, AMOLED). Although the cost of passive matrix driving is low, it cannot realize high-resolution display due to crosstalk phenomenon, and the passive matrix driving current is large, which reduces the service life of OLED. In contrast, the active matrix driving method sets a different number of transistors on each pixel as a current source, which avoids crosstalk, requires less driving ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3266G09G3/3233
Inventor 冷传利张盛东
Owner PEKING UNIV SHENZHEN GRADUATE SCHOOL
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com