Display Data-Line Pair Short Circuit for Potential Variation Control
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Solution Overview
Problem
Active matrix display devices experience image quality degradation due to variations in power supply and ground potentials caused by voltage drops during data-line charge-discharge current, especially in high-resolution displays using pulse width modulation, leading to potential variations that affect image quality.
Innovation Solution
The implementation of a display device with data-line pairs that stay in a high-impedance state before writing, temporarily short-circuiting to set potentials to an intermediate level, and then releasing the short-circuit state to write differential data signals, thereby reducing potential variations and image quality degradation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of data lines is increased for higher resolution, then display resolution is improved, but data-line charge-discharge current increases causing greater potential variations and image quality degradation
Solution Approach 1:
The data lines are segmented into multiple groups, with each group containing data lines that are short-circuited together. This segmentation allows the total charge-discharge current to be distributed across multiple groups, reducing the current burden on each individual group and thereby minimizing potential variations while maintaining high display resolution
Solution Approach 2:
Data lines within each group are short-circuited to maintain equipotential conditions, ensuring that all lines in a group share the same potential. This equipotential approach reduces potential differences and variations across the data line network, preventing image quality degradation even as the total number of data lines increases
2Ease of operation
If data lines are always connected to data-line drive circuit, then data writing is enabled, but potential variations occur due to continuous charge-discharge current
Solution Approach 1:
The data-line drive circuits operate in periodic cycles, alternately connecting different groups of data lines to the drive circuits. During each cycle, only one group is actively driven while other groups remain disconnected, allowing charge-discharge currents to be concentrated in time rather than continuously distributed, which reduces potential variations while maintaining data writing capability
Solution Approach 2:
Groups of data lines are temporarily extracted from the active data writing process and kept disconnected from the data-line drive circuits during periods when they are not being written to. This extraction eliminates unnecessary charge-discharge currents for inactive groups, reducing overall potential variations while preserving data writing functionality when needed
Data Source
AI summary
A display device includes: data-line pairs arranged side by side along a first direction; gate lines arranged side by side along a second direction; a display section including pixels each disposed at an intersection of a data-line pair and a gate line and connected to one or both of the data-line pair; a data-line drive circuit supplying a positive-phase data signal to one of the data-line pair and a negative-phase data signal to the other, and allowing the data-line pair to stay in a high-impedance state before writing of an image signal to the pixels; and a short circuit putting the data-line pair in a short-circuit state while the data-line pair stays in the high-impedance state, and then releasing the short-circuit state Following the release of the short-circuit state, the positive-phase data signal or/and the negative-phase data signal are written into the pixel as the mage signal.