OLED Substrate Compensation Circuit for High-Resolution Displays
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Solution Overview
Problem
The resolution of OLED display substrates is limited by the photolithographic process and fine metal mask size, and increasing the number of transistors in sub-pixels for brightness homogeneity occupies more panel area, hindering high-resolution displays.
Innovation Solution
A display substrate with a pixel array, common cathode current detection circuit, and data signal compensation circuit that calculates and applies compensation data to sub-pixels based on the pixel light-emitting currents and total common cathode current, allowing for threshold voltage compensation without additional compensation sub-pixels, thereby reducing panel area usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of transistors in sub-pixels is increased to improve brightness homogeneity, then display homogeneity is improved, but panel area occupied by sub-pixels increases
Solution Approach 1:
The pixel array is divided into multiple cathode common areas, with each area containing multiple compensation areas. This segmentation allows the compensation function to be distributed across multiple regions rather than requiring every sub-pixel to have full compensation circuitry, thereby reducing the area occupied by compensation components while maintaining display homogeneity.
Solution Approach 2:
The first sub-pixel in each compensation area is configured with current acquisition capabilities that serve multiple functions: it acquires pixel light-emitting current for compensation calculations and also serves as a reference for the entire compensation area. This multi-functionality reduces the need for separate compensation circuits in each sub-pixel, thereby reducing panel area occupation.
2Manufacturing precision
If compensation circuits are added to each sub-pixel to achieve threshold voltage compensation, then display homogeneity is improved, but device complexity increases
Solution Approach 1:
Multiple sub-pixels within the same compensation area share a common cathode and utilize the compensation data generated by the first sub-pixel. This merging approach consolidates compensation resources, allowing threshold voltage compensation to be achieved without requiring independent compensation circuits in each sub-pixel, thereby reducing device complexity.
Solution Approach 2:
The compensation data generated by the first sub-pixel is copied and applied to other sub-pixels within the same compensation area. This copying mechanism allows the compensation function to be propagated across multiple sub-pixels without requiring each to have its own compensation circuitry, thereby reducing device complexity while maintaining compensation effectiveness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables increased physical resolution by reducing the panel area occupied by each sub-pixel and improving display homogeneity without the need for sub-pixels with compensation functions.
Implementation Method 1
each of the sub-pixels comprises an organic light emitting diode, which comprises an anode, an organic luminescent layer, and a cathode
Implementation Method 2
the organic light emitting diode (OLED) in the first sub-pixel and the total current of the common cathode
Data Source
AI summary
A display substrate, a display equipment and a regional compensation method. The display substrate includes a pixel array, a common cathode current detection circuit, and a data signal compensation circuit. The common cathode current detection circuit is configured to detect a total current flowing through each common cathode; the data signal compensation circuit is configured to receive the pixel light emitting current of the first sub-pixel, receive the total current of the common cathode, and calculate compensation data for each of the sub-pixels according to the pixel light emitting current and the total current of the common cathode.