Display Gate Signal Pulse Width Adjustment for RC Delay Compensation
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Solution Overview
Problem
Liquid crystal display (LCD) apparatuses experience reduced quality due to resistance-capacitance (RC) time delays, leading to dimmer luminance, color mixing, and ghosting, particularly in areas farthest from the gate driving part, caused by uneven charging rates across the display panel.
Innovation Solution
A display apparatus and method that includes a timing controller generating reference control signals to adjust the pulse-width and phase of gate signals, using masking signals and operations like OR or XOR to compensate for RC time delays, ensuring synchronized and adjusted gate signals across the panel, thereby reducing local charging differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gate signals are transmitted through gate lines to drive the display panel, then the display panel can be driven sequentially row by row, but RC time delays cause charging rate differences in areas farthest from the gate driving part
Solution Approach 1:
The patent applies local quality by adjusting the pulse width of gate signals based on their position in the display panel. Gate signals for regions farther from the gate driving circuit are given longer pulse widths to compensate for RC time delays, while signals for nearer regions use standard pulse widths. This position-dependent adjustment ensures uniform charging rates across different areas of the panel.
Solution Approach 2:
The patent changes the parameter of gate signal pulse width dynamically based on the spatial position of the gate line. By varying this temporal parameter according to the electrical characteristics of different regions, the system compensates for RC time delays and achieves consistent charging performance across the entire display panel.
2Area of stationary object
If gate signals are transmitted through long gate lines, then the entire display panel can be addressed, but RC time delays cause dimmer luminance and display quality degradation in distant areas
Solution Approach 1:
The patent implements local quality by applying different pulse width adjustments to gate signals based on their destination region. Gate lines extending to distant areas receive extended pulse widths to ensure sufficient charging time, while shorter gate lines use standard pulse widths. This localized adaptation maintains luminance uniformity across the entire display area.
Solution Approach 2:
The patent applies preliminary action by pre-calculating and pre-setting the appropriate pulse width for each gate line based on its length and electrical characteristics. This advance preparation ensures that each gate signal is optimally configured before transmission, preventing luminance degradation before it occurs.
3Device complexity
If standard gate signals are used across all gate lines, then the gate driver circuit operation is simplified, but RC time delays cause charging period insufficiency in distant regions
Solution Approach 1:
The patent changes the pulse width parameter of gate signals based on positional requirements. By dynamically adjusting this single parameter according to gate line characteristics, the system maintains charging reliability without fundamentally altering the gate driver circuit architecture or adding complex control logic.
Data Source
AI summary
A display apparatus includes a display panel comprising a plurality of gate lines and a plurality of data lines, a gate driver circuit configured to generate a plurality of gate signals sequentially applied to the gate lines, and a timing controller configured to generate a reference control signal, the reference control signal adjusting at least one of a pulse-width and a phase of a predetermined gate signal among the gate signals.