Voltage Control Circuit for OLED Display Shadowing
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Solution Overview
Problem
Existing OLED display technologies face image quality issues due to different startup threshold voltages and response speeds of red, green, and blue electro-luminescent materials, leading to residual mixed color shadowing at light and dark junctions, especially when switching from low to high grayscale images, which reduces display quality.
Innovation Solution
A voltage control circuit that provides distinct initial voltages to red, green, and blue pixels and adjusts these voltages based on grayscale and brightness differences between frames to synchronize their startup lighting, reducing differences in brightness change per unit time and alleviating the shadowing phenomenon.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If distinct initial voltages are provided to red, green, and blue pixels, then startup lighting synchronization is improved, but device complexity increases
Solution Approach 1:
The voltage control circuit is segmented into multiple independent voltage control modules, with each module responsible for controlling the power supply voltage to a specific color pixel (red, green, or blue). This segmentation allows each module to independently adjust voltages for its assigned pixel type, achieving color-specific startup synchronization while keeping each module's complexity manageable through functional decomposition
Solution Approach 2:
The power supply voltage provided to each color pixel is made dynamic rather than static. The voltage control circuit adjusts the power supply voltage in real-time based on the startup stage and pixel type, transitioning from a simple static voltage supply to a dynamic controlled supply that adapts to different operational requirements, thereby synchronizing startup lighting across different color pixels
2Manufacturing precision
If power supply voltage is adjusted based on grayscale and brightness differences, then image quality is improved, but control complexity increases
Solution Approach 1:
The voltage control circuit incorporates feedback mechanisms that monitor grayscale values and brightness levels of different color pixels. Based on this feedback information, the circuit dynamically adjusts the power supply voltage to compensate for variations in electro-luminescent material characteristics, ensuring consistent display quality across red, green, and blue pixels while maintaining manageable control complexity through automated feedback-based regulation
3Manufacturing precision
If different voltages are provided to different color pixels, then brightness change synchronization is improved, but energy consumption increases
Solution Approach 1:
The system changes the voltage parameter dynamically based on the operational stage and pixel type. During the startup stage, higher or adjusted voltages are applied to synchronize brightness changes across different color pixels. Once startup is complete, the system transitions to normal operating voltages, thereby achieving brightness synchronization during critical transitions while minimizing energy consumption during steady-state operation
Data Source
AI summary
A voltage control circuit is configured to connected to a display panel, the display panel includes a plurality of pixels, the plurality of pixels includes a first pixel and a second pixel, and the first pixel and the second pixel are pixels corresponding to different colors. The voltage control circuit is configured to provide a first voltage to the first pixel and a second voltage to the second pixel at a first time and a second time, respectively; the first voltage provided at the first time is different from the second voltage provided at the first time, and the first voltage provided at the second time is identical with the second voltage provided at the second time.