OLED Subpixel Reset Circuit With Common Voltage Line
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Solution Overview
Problem
Existing display apparatuses, particularly organic light emitting display devices, face challenges in providing optimal reset voltages to each sub pixel without adding additional voltage lines in the active area, which affects electro-optical characteristics.
Innovation Solution
A display apparatus with a common reset voltage line connected to each sub pixel and an auxiliary capacitor between the anode and a low potential voltage line to supply optimal reset voltages, optimizing electro-optical characteristics and reducing the need for separate voltage lines in the active area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate voltage lines are added for each sub pixel to supply optimal reset voltages, then electro-optical characteristics are improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Multiple reset voltage lines that would traditionally be separate are merged into a single common reset voltage line. The patent implements this by having one reset voltage line serve multiple sub pixels through strategic placement of reset transistors and utilization of the data line as a reset voltage transmission path, thereby reducing the number of voltage lines while maintaining optimal reset voltage supply to each sub pixel
Solution Approach 2:
The data line is given multiple functions: it serves as both the data transmission line for driving the light emitting diode and as a reset voltage transmission line. This multi-functionality allows the system to supply optimal reset voltages to sub pixels without requiring dedicated separate voltage lines, thus reducing device complexity while maintaining electro-optical performance
2Reliability
If separate voltage lines are added for each sub pixel, then optimal reset voltage supply is achieved, but ease of manufacture deteriorates
Solution Approach 1:
The patent merges multiple voltage line functions into fewer lines, specifically making the data line serve dual purposes as both data transmission and reset voltage transmission. This reduces the number of lines that need to be fabricated and connected during manufacturing, simplifying the manufacturing process while still achieving optimal reset voltage supply to each sub pixel
Solution Approach 2:
By making the data line multi-functional (serving as both data transmission line and reset voltage line), the patent reduces the total number of lines that need to be manufactured and interconnected. This multi-functionality approach simplifies the manufacturing process by reducing connection complexity and the number of fabrication steps required, while maintaining the ability to supply optimal reset voltages
Data Source
AI summary
A display apparatus according to an example of the present disclosure includes a display panel having an active area in which a plurality of sub pixels of different colors are disposed and a non-active area adjacent to the active area, a light emitting diode disposed in each of the plurality of sub pixels and having an anode and a cathode, and a common reset voltage line connected to the anode to transmit different reset voltages to the anode in each of the plurality of sub pixels.