OLED Drive Circuit Compensation for Trace Resistance Brightness Uniformity
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Solution Overview
Problem
OLED displays suffer from non-uniformity in brightness due to varying wire resistances in the traces connecting display regions to the drive circuit, which affects the consistency of the display.
Innovation Solution
A drive circuit with compensation sub-circuits that output voltages based on the wire resistances of the traces, ensuring each display region receives a controlled voltage to achieve uniform brightness, with the compensation sub-circuits coupled one-to-one with the display regions through traces, and the output voltage determined by the resistance of the trace.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If traces with different wire resistances are used to connect display regions to the drive circuit, then the display can cover a larger area with more display regions, but the brightness uniformity across display regions deteriorates
Solution Approach 1:
The patent applies local quality by providing different compensation voltages to different display regions based on their specific wire resistance characteristics. Each compensation sub-circuit is configured to output a voltage tailored to its corresponding display region's trace resistance, thereby locally compensating for the brightness non-uniformity caused by varying wire resistances across the large display area.
Solution Approach 2:
The patent changes the voltage parameter output by each compensation sub-circuit according to the wire resistance of the corresponding trace. By adjusting the compensation voltage level based on the specific resistance value, the system compensates for the voltage drop across traces with different resistances, maintaining uniform brightness across the display area.
2Illumination intensity
If compensation sub-circuits are added to each display region to compensate for wire resistance, then brightness uniformity is improved, but the device complexity increases
Solution Approach 1:
The patent segments the drive circuit into multiple compensation sub-circuits, with each sub-circuit corresponding to a specific display region. This segmentation allows independent voltage compensation for each region based on its trace resistance, achieving brightness uniformity while maintaining modular circuit architecture that simplifies analysis and implementation.
Solution Approach 2:
The compensation sub-circuits use a universal compensation mechanism that can be applied to multiple display regions. Each sub-circuit performs the same function (voltage compensation based on trace resistance) but with different voltage levels, providing a scalable solution that maintains consistency across the display while managing complexity through functional repetition.
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 solution ensures uniform brightness across the OLED display panel by compensating for the impact of different wire resistances, resulting in improved display consistency and eliminating brightness variations.
Implementation Method 1
configured to output, to the corresponding display regions through the traces, voltages determined based on wire resistances of the traces
Data Source
AI summary
A drive circuit, a display device, and a debugging method. The drive circuit is coupled to a display panel, the display panel includes a plurality of display regions, and the drive circuit includes a plurality of compensation sub-circuits. The plurality of compensation sub-circuits are coupled to the plurality of display regions in a one-to-one corresponding manner through traces, and each of the compensation sub-circuits is configured to output a voltage determined based on a wire resistance of the trace to the corresponding display region through the traces. The display panel is configured as a plurality of display regions, and each display region is coupled to one drive circuit through one single trace, such that the compensation sub-circuits can apply different voltages to the display regions, and the voltages are determined based on wire resistances of the traces.