Display Device Common-Voltage Correction for Grayscale Shift Flicker
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Solution Overview
Problem
Conventional display devices face issues with common voltage shifting due to using the optimal common voltage of a high grayscale, leading to screen flicker and reduced yield, particularly in low grayscales.
Innovation Solution
A method to determine and correct the optimal common voltages of other grayscales based on a standard grayscale, using actual forward and reverse driving voltages to identify and adjust for any shifts, ensuring accurate voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optimal common voltage of a high grayscale is used to determine the common voltage of each grayscale, then color deviation is improved, but grayscale shift occurs causing screen flicker and reduced yield
Solution Approach 1:
The patent segments the grayscale range into multiple intervals, with each interval having its own optimal common voltage determined independently. Instead of using a single high-grayscale voltage for all grayscales, the system divides grayscales into different segments (e.g., low grayscale interval, middle grayscale interval, high grayscale interval) and determines separate optimal common voltages for each segment, thereby avoiding grayscale shift while maintaining color accuracy.
Solution Approach 2:
The patent changes the parameter of common voltage based on grayscale intervals. By adjusting the common voltage parameter differently for different grayscale ranges, the system optimizes display performance for each interval without causing shift effects. This involves measuring and determining specific common voltage values for each grayscale interval based on actual display characteristics.
2Object-generated harmful factors
If the common voltage of low grayscale is shifted to prevent grayscale crosstalk, then crosstalk is reduced, but screen flicker and mura deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where the system measures the actual display effect at different grayscales and adjusts the common voltage accordingly. By monitoring for shift effects and crosstalk, the system automatically optimizes the common voltage for each grayscale interval, ensuring display stability while preventing crosstalk through data-driven adjustments rather than fixed shifts.
3Device complexity
If a fixed common voltage is used for all grayscales, then device complexity is reduced, but display quality and yield decrease
Solution Approach 1:
The patent creates a universal solution that works across all grayscale intervals by establishing a systematic approach to determine optimal common voltages. The method provides a unified framework that can be applied to any display device, automatically adapting to different grayscale ranges and intervals while maintaining consistent quality standards throughout the entire grayscale spectrum.
Data Source
AI summary
The present application provides a display device driving method and a display device. In the display device driving method, when optimal common voltages of other grayscales are determined using an optimal common voltage of a standard grayscale, and when grayscale shift occurs in the other grayscales, the optimal common voltages of the other grayscales are corrected, so that correct common voltages can be adopted when the display device is driven, and problems such as screen flicker caused by the grayscale shift in the display device are prevented.