OLED Pixel Circuit Threshold Compensation With Three-Signal Control
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Solution Overview
Problem
Current OLED display devices face challenges with complex pixel circuits that require multiple control signals, leading to increased volume and power consumption, which are not conducive to narrow-frame displays.
Innovation Solution
A pixel circuit design that utilizes three control signals - a reset control signal, a scan control signal, and a light-emitting control signal, incorporating specific transistor types and a compensation capacitor to simplify the circuit structure and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple control signals are used to control the pixel circuit, then the display device can achieve various functions, but the volume of the display device increases
Solution Approach 1:
The patent combines multiple control functions into a single control signal line. Specifically, the control signal line transmits a composite control signal that contains both reset control and scan control information, eliminating the need for separate control signal lines for each function. This merging approach reduces the overall volume of the display device while maintaining full control capabilities.
Solution Approach 2:
The control signal line is designed to serve multiple functions simultaneously. It acts as both a reset control signal line and a scan control signal line, transmitting different types of control information at different times or in different phases. This multi-functional design reduces the number of dedicated control lines needed, thereby reducing device volume.
2Adaptability or versatility
If multiple control signals are used to control the pixel circuit, then various functions can be realized, but the structure of the pixel circuit becomes complex
Solution Approach 1:
The patent merges multiple control signal transmission functions into a single control signal line. The control signal line carries both reset control signals and scan control signals, reducing the number of separate control lines and simplifying the overall pixel circuit structure while maintaining all necessary control functions.
Solution Approach 2:
The control signal line operates in periodic phases, alternating between transmitting reset control signals and scan control signals. This time-division multiplexing approach allows a single control line to perform multiple functions sequentially, reducing circuit complexity while maintaining full functionality.
3Ease of manufacture
If low-temperature polysilicon thin film transistors are used in the pixel circuit, then the display device can be manufactured, but the power consumption increases
Solution Approach 1:
The patent changes the material parameter of the transistor from low-temperature polysilicon thin film to oxide semiconductor thin film. This material substitution significantly reduces power consumption while maintaining ease of manufacture, as oxide semiconductor transistors can still be fabricated using similar thin film deposition techniques but offer lower leakage current and reduced power consumption.
Data Source
AI summary
Disclosed are a pixel circuit, a driving method of the pixel circuit and a display device, the pixel circuit including a reset unit, a voltage writing unit and a light-emitting control unit, the reset unit is connected to a reset control signal terminal, and resets the pixel circuit under the control of the reset control signal; the voltage writing unit stores a data signal and a threshold voltage of a driving transistor under the control of the scan control signal; the light-emitting control unit is connected to a light-emitting control signal terminal and includes the driving transistor, and use the data signal and the threshold voltage to generate a current under control of the light-emitting control signal; the light-emitting control unit includes a first type transistor, the reset unit and the voltage writing unit include a second type transistor different from the first type transistor.