Display Pixel Compensation Circuitry for 2H Scan Odd-Even Mismatch
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Solution Overview
Problem
Electronic displays exhibit front-of-screen distortions such as luminance and color mismatches between odd and even subpixels due to high spatial frequency image data and panel loading, causing voltage ripple and capacitively coupled sampling at different timings.
Innovation Solution
Implement odd-even row mismatch compensation circuitry using lookup tables and a multiplexer to adjust subpixel data values based on input data, brightness, and color type, combined with location-based scaler compensation to accommodate subpixel location dependency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If 2H scan signals are used to drive subpixels, then power consumption is reduced and refresh rate is improved, but voltage ripple is generated causing luminance mismatch between odd and even subpixels
Solution Approach 1:
The patent applies parameter changes by adjusting the input data values based on the subpixel row type (odd or even). Compensation values are added to the input data for odd-row subpixels and even-row subpixels differently, modifying the electrical parameters to counteract the voltage ripple effects and achieve uniform luminance output across all subpixels.
Solution Approach 2:
The patent implements local quality by applying different compensation strategies to different parts of the display. Specifically, odd-row subpixels receive one type of compensation value while even-row subpixels receive another type, allowing each region to be optimized for its specific conditions caused by the 2H scan signal timing.
2Manufacturing precision
If lookup tables with compensation values are implemented, then luminance mismatch is compensated, but device complexity increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing compensation values in lookup tables before the display operation begins. These compensation values are prepared in advance based on the specific 2H scan signal characteristics and panel properties, allowing the system to simply retrieve and apply pre-determined correction values during operation rather than calculating them in real-time.
Solution Approach 2:
The patent uses lookup tables as an intermediary between the input data and the final display output. The LUTs act as a mediation layer that translates input data values into compensated output values, simplifying the overall system architecture by centralizing the compensation logic in dedicated lookup structures rather than distributing complex compensation circuitry throughout the display.
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
Compensates for voltage ripple and luminance mismatch, improving display performance and user experience by reducing front-of-screen distortions.
Implementation Method 1
The voltage ripple of the 2H scan signal may be capacitively coupled and sampled to subpixels on odd and even rows at different timings, respectively
Data Source
AI summary
Display pixels of an electronic display may exhibit front-of-screen distortions when high spatial frequency image data is applied on the electronic display panel. The high spatial frequency may generate voltage ripple on a storage capacitor of pixel driving circuitry, causing mismatch between luminance of a first subpixel on an odd-numbered row and a corresponding subpixel on an even-numbered row. This odd-even row mismatch may be compensated via mismatch compensation circuitry. The mismatch compensation circuitry may include an odd subpixel compensation LUT and an even subpixel compensation LUT. The odd subpixel compensation LUT may output odd subpixel compensation values and the even subpixel compensation LUT may output even subpixel compensation values. The multiplexer may combine the odd subpixel compensation values and the even subpixel compensation values with input image data to generate compensated subpixel data, which may reduce or eliminate the odd-even row mismatch.