Electro-optical Device Pixel Circuit Segmented Data Writing
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Solution Overview
Problem
Existing electro-optical devices with OLED light-emitting elements face challenges in securing sufficient light emission periods due to time constraints within one frame period, leading to potential darkening of the display image.
Innovation Solution
The electro-optical device incorporates a pixel circuit configuration with multiple capacitance elements and transistors, allowing for sequential data signal holding in alternating frames, enabling simultaneous light emission of OLEDs without accelerating the line-sequential writing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If line-sequential writing of data signals is accelerated to complete within one frame period, then data writing speed is improved, but the light emission period becomes insufficient causing display image darkening
Solution Approach 1:
The patent divides the data writing process into two separate frames: odd frames for writing data to first capacitance elements and even frames for writing data to second capacitance elements. This segmentation allows each frame to dedicate full time to data writing without rushing, while the next frame can immediately perform light emission. The result is that data writing is completed at a sustainable pace while light emission period is maximized.
Solution Approach 2:
The patent performs preliminary data writing actions in odd frames before the light emission period of even frames begins. By pre-writing data to capacitance elements in advance, the system prepares everything needed for light emission so that when the light emission period arrives, all data is ready and can be displayed simultaneously without time pressure.
2Productivity
If line-sequential writing is accelerated to fit within one frame period, then writing efficiency is improved, but display image brightness deteriorates
Solution Approach 1:
The patent segments the writing operation across two frames (odd and even frames), allowing each frame to perform writing efficiently without compromising the light emission period. This segmentation maintains writing efficiency while ensuring sufficient time for bright light emission.
Solution Approach 2:
The patent implements periodic alternating action between odd frames (writing to first capacitance elements) and even frames (writing to second capacitance elements). This periodic structure creates a rhythm where writing and light emission are distributed evenly, preventing both writing inefficiency and brightness loss.
3Duration of action of moving object
If simultaneous light emission of OLEDs is achieved without accelerating writing, then light emission period is extended, but line-sequential writing cannot be completed in time
Solution Approach 1:
The patent segments the writing task across two frames, with odd frames handling first capacitance elements and even frames handling second capacitance elements. This allows the light emission period to be extended without actually extending the total writing time, because writing is distributed over two frames rather than compressed into one.
Solution Approach 2:
The patent performs preliminary writing actions in odd frames before the even frame light emission period begins. This preliminary action ensures that data is ready for light emission without requiring accelerated writing during the light emission period itself.
Data Source
AI summary
In an odd frame, a plurality of scanning lines are selected sequentially, and in one pixel circuit, when a scanning line corresponding to the one pixel circuit is selected, a first selector electrically couples one end of a first capacitance element to a data line, and a second selector electrically couples one end of a second capacitance element to the gate node of a transistor. In an even frame, the plurality of scanning lines are selected sequentially, and when the scanning line is selected, the first selector electrically couples one end of the second capacitance element to the data line, and the second selector electrically couples one end of the first capacitance element to the gate node.