Display Device Gray Level Correction Circuit
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Solution Overview
Problem
Active matrix display devices face issues with variations in output among analog amplifiers due to differences in load, leading to deviations in pixel brightness, which cannot be effectively addressed without increasing power consumption, especially in mobile devices.
Innovation Solution
A display device with a control circuit that determines correction amounts for gray levels of subpixels based on their distribution, allowing for precise adjustment of brightness without increasing power consumption by using a gray level correction unit within the driver IC.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the control circuit increases power consumption to compensate for variations in analog amplifier output, then brightness uniformity is improved, but energy consumption increases
Solution Approach 1:
The control circuit performs preliminary analysis of the image data to predict brightness deviations before they occur. By calculating correction amounts in advance based on the distribution of gray levels and individual pixel characteristics, the system compensates for analog amplifier variations without requiring increased power consumption during actual display operation
Solution Approach 2:
The system changes the gray level parameters of subpixels dynamically based on their position and the overall image content. By adjusting correction amounts according to the distribution of gray levels in the image, the control circuit optimizes brightness uniformity adaptively without a fixed power penalty
2Measurement precision
If correction amounts are determined based on distribution of gray levels and individual gray levels, then brightness accuracy is improved, but processing complexity increases
Solution Approach 1:
The correction process is segmented into distinct stages: first analyzing the distribution of gray levels across the entire image, then determining individual correction amounts for each subpixel row based on both the overall distribution and individual gray level values. This segmentation allows the complex correction to be broken down into manageable computational steps
Solution Approach 2:
The control circuit uses feedback from the analyzed gray level distribution to continuously optimize correction amounts. By monitoring the distribution pattern and adjusting corrections accordingly, the system achieves high brightness accuracy through an adaptive feedback mechanism rather than complex fixed algorithms
Data Source
AI summary
A display device includes a display panel and a control circuit configured to process a signal for the display panel. The control circuit is configured to acquire respective gray levels specifying brightness for a plurality of subpixels in one subpixel row, determine correction amounts to the gray levels for the plurality of subpixels based on distribution of the gray levels and the individual gray levels for the plurality of subpixels, and correct the gray levels for the plurality of subpixels by the correction amounts.