Overvoltage Compensation Binding Point Configuration for Display Panels
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Solution Overview
Problem
Existing overvoltage compensation tables with 8-bit depth suffer from data accuracy loss and abnormal display transitions in low grayscale gradients due to non-incremental binding point settings, especially in the 0-4 grayscale value range.
Innovation Solution
An overvoltage compensation method that sets multi-level grayscale values in an arithmetic sequence with a common difference of 1, a first term of 0, and a last term of (2k−1), where k is greater than 8, and selects binding point values with a difference not greater than 2k−8, to improve accuracy and prevent abnormal transitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If 8-bit depth overvoltage compensation tables are used, then device complexity is reduced, but data accuracy is lost when processing grayscale values with bit width greater than 8 bits
Solution Approach 1:
The patent extends the compensation table from 8-bit depth to 10-bit depth, adding a new dimension of precision. By increasing the bit depth from 8 to 10 bits, the table can represent grayscale values from 0-255 to 0-1023, maintaining data accuracy for higher bit width inputs while still keeping the table structure manageable through systematic binding point selection.
2Device complexity
If binding points are not set in incremental manner in low grayscale region, then device complexity is reduced, but abnormal transition occurs in display picture in low grayscale gradient
Solution Approach 1:
The patent applies local quality by differentiating binding point distribution across different grayscale regions. In the low grayscale region (0-4), binding points are set with incremental differences of 1 to ensure smooth transitions. In higher grayscale regions, larger intervals between binding points are acceptable, reducing overall complexity while maintaining display reliability where it matters most.
3Device complexity
If binding point interval is large, then device complexity is reduced, but data accuracy is lost and abnormal transition occurs in low grayscale gradient
Solution Approach 1:
The patent changes the binding point interval parameter dynamically based on the grayscale value range. For grayscale values 0-4, the interval is set to 1 (maximum precision). For higher ranges, the interval increases progressively. This parameter adaptation allows the system to maintain precision where needed while reducing the total number of binding points, balancing complexity and accuracy.
Data Source
AI summary
A overvoltage compensation method for a display panel includes determining a corresponding compensation voltage value according to grayscale values of two adjacent pixels in a same column in a same frame or grayscale values of a same pixel in two adjacent frames, and an overvoltage compensation table, wherein the overvoltage compensation table has a first grayscale value group and a second grayscale value group that both contain all integers in [0,2k), the integers include a plurality of binding point values, and a difference between two adjacent binding point values of the first four binding point values is not greater than 2k−8, wherein k is an integer greater than 8; transmitting the compensation voltage value to the display panel to make the pixel present the second grayscale value.