OLED Pixel Circuit Layout With Shared Control Channels
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Solution Overview
Problem
Existing display units, particularly organic EL display units, face challenges in enhancing image quality due to variations in drive transistor characteristics, which can degrade image quality and reduce contrast ratio.
Innovation Solution
The display unit incorporates a configuration where control transistors in adjacent pixel circuits share a common channel portion, reducing ON resistance and enhancing image quality by minimizing current flow during non-light emission periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate channel portions are formed for each control transistor in adjacent pixel circuits, then each transistor can be independently controlled, but the ON resistance increases and image quality deteriorates
Solution Approach 1:
The patent merges the channel portions of adjacent control transistors into a single shared channel structure. Specifically, the gate electrodes of adjacent control transistors are positioned adjacent to each other and extend in the row direction, forming a common channel region that reduces overall ON resistance while maintaining independent transistor control through separate gate electrode control.
2Reliability
If more transistors are used in each pixel circuit to improve image quality control, then image quality enhancement is achieved, but the pixel circuit area increases and pixel density decreases
Solution Approach 1:
By combining channel portions of adjacent control transistors into a shared structure, the patent reduces the total area required for pixel circuits while maintaining the necessary transistor functionality for image quality control.
Solution Approach 2:
The shared channel portion serves multiple control transistors simultaneously, allowing a single structural element to perform the function of multiple separate channels, thereby reducing pixel circuit area while maintaining control capabilities.
Data Source
AI summary
A display unit of the present disclosure includes a plurality of pixel circuits each including a light-emitting element, a drive transistor that has a drain and a source and supplies a current to the light-emitting element, and a control transistor connected to the drain or the source of the drive transistor. One channel portion is formed for two control transistors in respective adjacent two of the pixel circuits.