Display Device Pixel Sensing and Interpolation
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Solution Overview
Problem
Display devices face challenges in maintaining uniform image quality due to variations in threshold voltage and mobility of driving transistors across pixels, leading to luminance deviations over time.
Innovation Solution
A display device and method that perform external compensation by sensing some pixels, interpolating values for unsensed pixels, and determining final sensing values based on differences between previous and interpolated sensing values, reducing interpolation errors and improving sensing reliability and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If all pixels are sensed in every sensing period, then measurement precision of transistor characteristics is improved, but loss of time increases due to extended sensing duration
Solution Approach 1:
The pixel array is divided into multiple pixel groups, where only one group is sensed in each sensing period. This segmentation allows the sensing operation to be performed on a subset of pixels rather than all pixels, thereby reducing the total sensing time while maintaining measurement precision for the sensed group.
Solution Approach 2:
Sensing values for unsensed pixels are obtained through interpolation using data from previously sensed pixel groups. This preliminary action of interpolating values in advance eliminates the need to sense all pixels directly, reducing sensing time while providing sufficient measurement precision for compensation purposes.
2Loss of time
If only some pixels are sensed, then loss of time is reduced, but measurement precision deteriorates due to interpolation errors
Solution Approach 1:
The sensing driver determines final sensing values by comparing previously sensed values with currently interpolated values, using feedback mechanisms to validate and correct interpolation results. This feedback loop ensures that interpolation errors are minimized and measurement precision is maintained even when only some pixels are directly sensed.
Solution Approach 2:
The sensing system dynamically switches between sensing different pixel groups in different periods, with the sensing driver adaptively determining which pixels to sense and which to interpolate based on current display timing and degradation patterns. This dynamic approach optimizes the balance between sensing time and measurement precision.
3Reliability
If sensing is performed on all pixels, then reliability of compensation is improved, but productivity decreases due to reduced display refresh rate
Solution Approach 1:
By segmenting the pixel array into multiple groups and sensing only one group per sensing period, the system maintains compensation reliability for the sensed pixels while reducing the overall sensing time burden. This allows display refresh operations to proceed with minimal interruption, preserving productivity.
Solution Approach 2:
The system performs sensing on only a partial set of pixels (one group) rather than all pixels, which is sufficient to maintain compensation reliability through interpolation and comparison methods. This partial action approach ensures that sensing operations do not excessively consume time that would otherwise be available for display refresh, thus maintaining high productivity.
Data Source
AI summary
A display device and a method of driving a display device are disclosed. The display device includes pixels respectively connected to corresponding scan lines, corresponding control lines, corresponding data lines, and corresponding sensing lines, a scan driver which supplies a scan signal to a scan line of the corresponding scan lines, and supplies a control signal to a control line of the corresponding control lines, a data driver which supplies one of an image data signal and a sensing data signal to a data line of the corresponding data lines, and a sensing driver which senses characteristics of driving transistors of different pixels of the pixels in a previous sensing period and a current sensing period, and determines a final sensing value of a target pixel of the pixels in the current sensing period, based on a difference between a previous sensing value of the target pixel, which is determined based on the sensing in the previous sensing period, and a preliminary sensing value of the target pixel, which is calculated based on the sensing in the current sensing period.