Driving Controller for Display Panel Low Grayscale Flicker
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Solution Overview
Problem
Display panels experience deviations in gamma value and color coordinates in low grayscale ranges, leading to image quality issues such as stains and flicker, due to the limitations of existing driving methods.
Innovation Solution
A driving controller that analyzes input image data to set boundary and minimum grayscale values, adapting between digital and analog driving methods based on peak luminance and gamma values to enhance display quality by minimizing luminance differences and preventing flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a display panel uses a conventional driving method in low grayscale range, then the driving circuit is simple, but gamma value and color coordinate deviate from target values causing image quality degradation
Solution Approach 1:
The patent applies dynamics by switching between two driving methods based on the grayscale value range. For low grayscale values (≤ threshold), a first driving method with digital signal processing is used, while for normal grayscale values (> threshold), a second driving method with analog signal processing is used. This dynamic adaptation resolves the contradiction by optimizing gamma precision where needed without permanently increasing circuit complexity.
Solution Approach 2:
The patent changes the driving parameter (driving method) based on the grayscale value parameter. By monitoring the grayscale value and switching between digital and analog driving methods, the system achieves high gamma precision in the critical low grayscale range while maintaining simplicity in the normal range. The threshold parameter separates these two operational modes.
2Manufacturing precision
If a display panel uses digital driving method in low grayscale range, then gamma value precision is improved, but luminance difference increases causing flicker
Solution Approach 1:
The patent adjusts the grayscale threshold parameter dynamically based on peak luminance and gamma value. When peak luminance is high or gamma value is low, the threshold is set lower to limit the digital driving range, thereby reducing flicker. When peak luminance is low or gamma value is high, the threshold can be higher, allowing more aggressive digital correction. This parameter adaptation resolves the flicker issue while preserving gamma precision.
Solution Approach 2:
The patent uses feedback from peak luminance detection and gamma value measurement to adjust the grayscale threshold. The image analyzer detects peak luminance, and this information feeds back to the grayscale setter which adjusts the threshold accordingly. This closed-loop feedback mechanism prevents flicker by adapting the digital driving range to actual display conditions.
3Manufacturing precision
If grayscale threshold is increased to expand digital driving range, then gamma value precision is improved, but luminance difference increases causing flicker
Solution Approach 1:
The patent dynamically changes the grayscale threshold parameter based on peak luminance and gamma value feedback. The grayscale setter adjusts the threshold to an optimal value that balances gamma precision and flicker prevention. This parameter adaptation resolves the contradiction by preventing the threshold from being statically increased, which would cause flicker.
Solution Approach 2:
The system uses feedback from peak luminance detection and gamma value measurement to control the grayscale threshold. The image analyzer provides peak luminance information, and the grayscale setter uses this feedback to set an appropriate threshold that prevents flicker while maintaining gamma precision in the digital driving range.
Data Source
AI summary
A driving controller includes an image analyzer, a grayscale setter and a time-and-space arranger. The image analyzer analyzes input image data to determine a peak luminance. The grayscale setter receives a gamma value and the peak luminance and to determine a boundary grayscale value and a minimum grayscale value. The time-and-space arranger is configured to temporally and spatially arrange first data having the boundary gray scale value and second data having the minimum grayscale value. The driving controller is configured to drive a display panel using the first data and the second data for a low grayscale range of which a grayscale is equal to or less than the boundary grayscale value and to drive the display panel based on a data signal corresponding to a grayscale value of the input image data for a normal grayscale range of which a grayscale is greater than the boundary grayscale value.