A pixel driving circuit in silicon base organic luminescent display device

Abstract

The invention relates to a pixel driving circuit in a silica-based organic luminous display, which is a pixel driving circuit that an input electricity is connected with a column scan line, a row scanline and a data line while an output electricity is connected with a diode, wherein the pixel driving circuit is connected with a pixel driving circuit with a constant current source through a levelshifter circuit by a binary latch; the binary latch is used for gate of column and row data of the display equipment; the pixel driving circuit with the constant current source is used for providing current with fixed amplitude for an organic light emitting diode under pixel gate condition to allow organic light emitting diode to light, and change the intensity according to duty ratio of data provided by the data line; the level shifter circuit is used for high and low level shifting between the binary latch and the pixel driving circuit with the constant current source; the pixel driving circuit transmits data on a data line to the pixel driving circuit according to a column scan line and a row scan line, which results in gray-scale display of the organic light emitting diode. The whole pixel driving circuit of the invention adopts a transistor for charge and discharge instead of a traditional capacitor, thus the aperture ratio of the pixel circuit is significantly improved; through theconstant current provided by a quiescent current source, the current passing under operating condition of the organic light emitting diode can be accurately controlled and not influenced by a thresho ld voltage.

Description

Technical field [0001] The present invention relates to a pixel driving circuit (Pixel Circuit) in a silicon-based organic light-emitting display device (OLED-on-Silicon), and in particular to a constant current source pixel connected by a binary latch via a level conversion circuit Pixel drive circuit composed of drive circuit. Background technique [0002] Silicon-based organic light-emitting display devices use organic light-emitting diodes as light-emitting devices, and complementary metal oxide semiconductors as switching components or driving components of organic light-emitting diodes, including active pixel driving, row scanning driving circuit, and column scanning driving The circuit and the necessary control circuit are designed to minimize the total number of system chips and reduce costs. [0003] Compared with Liquid Crystal Display (LCD), organic light emitting diodes have all solid state, simple process, low voltage drive, low power consumption, low cost, fast respo...

AI Technical Summary

Problems solved by technology

[0009] However, it is very difficult for conventional voltage-driven pixel circuits to achieve high-level grayscale display. This is due to issues such as process manufacturing, even between different pixels on the same substrate, the threshold voltage V between transistors of the same type TH There will also be changes, causing the current flowing through the organic light-emitting diode to vary greatly with different pixels, making the current through the organic light-emitting diode unstable, and it is difficult to control the grayscale display

Process manufacturing will also bring inconsistencies in carrier mobility, which will further affect the uneven brightness of display pixels

Images