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OLED pixel driving circuit and OLED display device

A pixel drive circuit and display mode technology, applied in static indicators, instruments, etc., can solve the problems of increased manufacturing cost, increased number of drive IC channels, and reduced pixel aperture ratio, achieving low manufacturing cost, reduced number of channels, and improved The effect of aperture ratio

Active Publication Date: 2019-12-24
SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] 1. The reference voltage signal Vref provides a reference voltage for each pixel, and its wiring reduces the aperture ratio of the pixel
[0011] 2. The generation of the reference voltage signal Vref increases the number of channels of the driver IC and increases the manufacturing cost

Method used

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  • OLED pixel driving circuit and OLED display device
  • OLED pixel driving circuit and OLED display device
  • OLED pixel driving circuit and OLED display device

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Embodiment Construction

[0044] In order to further illustrate the technical means adopted by the present invention and its effects, the following describes in detail in conjunction with preferred embodiments of the present invention and accompanying drawings.

[0045] Please also see Figure 3 to Figure 7 , The invention provides an OLED pixel driving circuit. Such as image 3 , Figure 4 ,and Figure 6 As shown, the OLED pixel driving circuit of the present invention includes a first thin film transistor T1, a second thin film transistor T2, a third thin film transistor T3, a fourth thin film transistor T4, a capacitor C1, an organic light emitting diode D1, and a driver IC 10 The switching switch K, the digital-to-analog converter DAC, and the analog-to-digital converter ADC. Wherein, the fourth thin film transistor T4 is a driving thin film transistor directly driving the organic light emitting diode D1.

[0046] The OLED pixel driving circuit adopts a 4T1C structure, and a switch K is set, a...

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PUM

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Abstract

An OLED pixel driver circuit and an OLED display device. The OLED pixel driver circuit adopts a 4T1C structure, and is provided with a changeover switch (K), a first pin (K1) of the changeover switch (K) being electrically connected to a drain of a third thin film transistor (T3), a second pin (K2) being electrically connected to a digital-to-analog converter (DAC), a third pin (K3) being electrically connected to an analog-to-digital converter (ADC); said driver circuit controls, by means of a switch signal (Switch), the changeover switch (K) to connect the first pin (K1) and the second pin (K2) so as to enter a display mode, and controls, by means of the switch signal (Switch), the changeover switch (K) to connect the first pin (K1) and the third pin (K3) so as to enter a sensing mode, such that the analog-to-digital converter (ADC) senses a threshold voltage (Vth) of a fourth thin film transistor (T4), which is used, after the analog-to-digital conversion, for data compensation in the display mode. Accordingly, the invention has the compensation function, being able to improve the display uniformity, and improve the aperture ratio of pixels, reducing the manufacturing cost.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an OLED pixel driving circuit and an OLED display device. Background technique [0002] Organic light emitting diode (Organic Light Emitting Display, OLED) display device has self-illumination, low driving voltage, high luminous efficiency, short response time, high definition and contrast, nearly 180° viewing angle, wide operating temperature range, and can realize flexible display and With many advantages such as large-area full-color display, it is recognized by the industry as a display device with the most potential for development. [0003] The OLED is a current-driven device. When a current flows through the OLED, the OLED emits light, and the brightness of the light is determined by the current flowing through the OLED itself. Most existing integrated circuits (Integrated Circuit, IC) only transmit voltage signals, so the pixel driving circuit of the OLED needs to compl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3233
CPCG09G3/3233
Inventor 邝继木解红军
Owner SHENZHEN CHINA STAR OPTOELECTRONICS SEMICON DISPLAY TECH CO LTD