Electroluminescence Display Voltage Switching Circuit
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Solution Overview
Problem
In organic light-emitting displays, parasitic capacitance in transistors causes kickback voltage, leading to luminance degradation and non-uniformity across the screen due to variations in gate signal delays, resulting in motion blur and susceptibility to electromagnetic interference.
Innovation Solution
The implementation of separate power lines and switching circuits for each block of pixels, allowing voltage switching between high-level and low-level voltages, which reduces kickback voltage and improves luminance uniformity by controlling the light emission timings and distributing peak current across blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If separate power lines and switching circuits are implemented for each block of pixels, then luminance uniformity is improved and kickback voltage is reduced, but device complexity increases
Solution Approach 1:
The display device is divided into multiple blocks, with each block having separate power lines (first and second power lines) and switching circuits (first and second switching circuits). This segmentation allows independent voltage control for each block, reducing the impact of kickback voltage from parasitic capacitance in transistors and improving luminance uniformity across the screen.
Solution Approach 2:
The switching circuits dynamically switch the voltage supplied to power lines between high-level voltage and low-level voltage based on emission periods. This dynamic voltage switching enables precise control of pixel activation timing, compensating for kickback effects and achieving uniform luminance across different blocks.
2Manufacturing precision
If voltage switching between high-level and low-level voltages is implemented, then kickback voltage effect is reduced, but power consumption increases
Solution Approach 1:
The switching circuits perform periodic voltage switching between high-level and low-level voltages synchronized with the emission periods of pixels. By switching voltages periodically rather than continuously, the system reduces kickback voltage effects while minimizing unnecessary power consumption during non-emission periods.
Data Source
AI summary
An electroluminescence display includes a plurality of pixels; a first power line and a second power line, coupled to each of the plurality of pixels respectively to provide a first voltage and a second voltage; and a switching circuit, configured to switch the first voltage and the second voltage between a high level voltage and a low level voltage, respectively.