Display Device Pixel Polarity Inversion Kickback Voltage Compensation
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Solution Overview
Problem
Display devices with reduced data and gate drive circuits suffer from kickback voltage deviations, leading to defects like afterimages and vertical line patterns due to charging time issues, which degrade display quality.
Innovation Solution
The implementation of a display device with a specific pixel connection structure and polarity inversion method, where data voltages are applied with alternating polarities to data lines and gate signals are sequentially applied to gate lines, compensating for kickback voltage deviations between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If different color pixels are connected to one data line or gate line to reduce the number of drive circuits, then device complexity and manufacturing cost are reduced, but kickback voltage deviation occurs leading to degraded display quality
Solution Approach 1:
The patent segments the pixel array into different groups based on their connection to data lines and gate lines. By applying different polarity sequences to different segments (e.g., first polarity to pixels connected to even-numbered data lines, second polarity to pixels connected to odd-numbered data lines), the kickback voltage deviations are compensated without requiring additional drive circuits.
Solution Approach 2:
The patent implements periodic polarity inversion of data voltages applied to different data lines. By inverting the polarity of data voltages in a periodic manner (e.g., alternating between first and second polarities across different data lines or time periods), the kickback voltage deviations are balanced and compensated, eliminating display defects while maintaining the reduced drive circuit configuration.
2Manufacturing precision
If data voltages are applied with alternating polarities to compensate for kickback voltage deviation, then display quality is improved, but the complexity of voltage control increases
Solution Approach 1:
The existing data drive circuit is designed to perform multiple functions: it not only applies data voltages to data lines but also controls the polarity inversion patterns across different data lines and time periods. This multi-functionality allows the circuit to compensate for kickback voltage deviations without requiring separate dedicated circuits for polarity control, thereby managing complexity while improving display quality.
Data Source
AI summary
A display device includes a display panel, a data driving part and a gate driving part. The display panel includes a first pixel row. The first pixel row includes a first pixel connected to an (n+1)-th gate line and an (m+1)-th data line (where ‘n’ and ‘m’ are natural numbers), and a second pixel connected to an n-th gate line and an (m+2)-th data line. The data driving part applies a data voltage having a first polarity with respect to a reference voltage to the (m+1)-th data line, and applies a data voltage having a second polarity with respect to the reference voltage to the (m+2)-th data line. The gate driving part sequentially applies a gate signal to the n-th gate line and the (n+1)-th gate line.