OLED Pixel Structure with Integrated Drive and Compensation Circuits
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Solution Overview
Problem
Existing OLED display technologies face challenges in achieving high resolution and light emission uniformity due to the increased number of data lines, which complicates pixel layout and compensation processes.
Innovation Solution
A pixel structure with four sub-pixel units, each driven by a unique combination of drive circuits connected to different data and scanning lines, incorporating drive, writing, detecting, and storage sub-circuits, and a sensing compensation circuit to optimize charge storage and compensation gain calculation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pixel compensation circuit is used to compensate threshold voltage of drive transistor, then light emission uniformity is improved, but the number of data lines increases which complicates pixel layout and reduces resolution
Solution Approach 1:
The patent combines the compensation circuit and drive circuit into a single integrated structure that shares data lines. The compensation transistor and drive transistor are merged such that they can be controlled through common data lines, reducing the total number of data lines required while maintaining compensation functionality for light emission uniformity.
Solution Approach 2:
The drive circuit is designed to perform multiple functions: it serves as both the compensation circuit for threshold voltage compensation and as the drive circuit for controlling light emission. This multi-functionality eliminates the need for separate dedicated compensation data lines, as the same data lines control both compensation and driving operations at different time periods.
2Manufacturing precision
If more data lines are included in each pixel structure to improve compensation, then light emission uniformity is improved, but pixel layout space increases which hinders high resolution realization
Solution Approach 1:
The patent merges the compensation circuit and drive circuit into a single integrated structure that shares data lines. The compensation transistor and drive transistor are merged such that they can be controlled through common data lines, reducing the total number of data lines required while maintaining compensation functionality for light emission uniformity.
Solution Approach 2:
The patent utilizes time dimension by operating the compensation circuit and drive circuit at different time periods (first time period for compensation, second time period for driving). This temporal separation allows the same physical components and data lines to serve dual purposes, effectively reducing the spatial requirements without compromising compensation performance.
Data Source
AI summary
Provided are a pixel structure, a display panel and a control method thereof. The pixel structure includes four sub-pixel units, wherein the i-th sub-pixel unit includes: an i-th element to be driven and an i-th drive circuit, 1≤i≤4, and the i-th drive circuit is respectively connected with an M-th data line and an N-th scanning line, and is configured to drive the i-th element to be driven according to a data signal of the M-th data line under control of the N-th scanning line,M={1,1≤i≤22,3≤i≤4,N={1,2≤i≤32,iis1or4.