Display Device Unevenness Correction via Voltage Range Adaptation
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Solution Overview
Problem
Display devices, such as LCDs, face luminance unevenness and mura defects due to variations in pixel characteristics and manufacturing processes, leading to suboptimal image quality, and existing correction methods are unsuitable when switching from test control boards to different control boards with varying analog driving voltage levels.
Innovation Solution
A display device with a power management circuit generating analog driving voltage, a correction data memory storing unevenness correction data sets for multiple voltage ranges, and a controller determining the current voltage range to select and apply the appropriate correction data for image data, ensuring accurate unevenness correction regardless of control board voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If unevenness correction is performed using a test control board, then luminance uniformity is improved, but the correction data becomes unsuitable when switching to a different control board with varying analog driving voltage levels
Solution Approach 1:
The patent applies parameter changes by storing multiple unevenness correction data sets corresponding to different analog driving voltage levels in the correction data memory. When the power management circuit outputs an analog driving voltage, the controller identifies the corresponding voltage level and selects the appropriate correction data set from memory, thereby adapting the correction process to the specific voltage level being used.
Solution Approach 2:
The patent segments the correction data into multiple distinct data sets, each corresponding to a specific analog driving voltage level. This segmentation allows the system to select and apply the appropriate correction data based on the current voltage level, ensuring accurate correction across different control boards while maintaining luminance uniformity.
2Adaptability or versatility
If multiple unevenness correction data sets are stored for different voltage ranges, then adaptability to different control boards is improved, but memory requirements and system complexity increase
Solution Approach 1:
The correction data memory is designed to store multiple unevenness correction data sets that can serve different analog driving voltage levels. This multi-functional memory structure allows the same hardware component to support various control boards with different voltage characteristics, achieving universality without requiring separate correction systems for each voltage level.
Data Source
AI summary
A display device includes a display panel including a plurality of pixels, a power management circuit configured to generate an analog driving voltage, a correction data memory configured to store a plurality of unevenness correction data sets respectively corresponding to a plurality of analog driving voltage ranges, a controller configured to determine, among the plurality of analog driving voltage ranges, a current analog driving voltage range to which the analog driving voltage output from the power management circuit belongs, to select an unevenness correction data set corresponding to the current analog driving voltage range from the plurality of unevenness correction data sets stored in the correction data memory, and to correct image data based on the selected unevenness correction data set, and a source driver configured to receive the corrected image data from the controller, and to provide the plurality of pixels with data voltages corresponding to the image data.