LCD Driving Module for Tri-Gate Charging Inequality
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Solution Overview
Problem
Liquid crystal display (LCD) devices with tri-gate structures face charging inequality among subpixels due to reduced charging time, leading to insufficient charging and resulting in light and dark lines and color inequality, which existing methods like double gate pulses or overlap gate pulses attempt to address but increase power consumption.
Innovation Solution
A driving module and method that generate data and gate driving signals to charge subpixels with different orders in different frames or varying charging periods within the same frame, ensuring each subpixel is charged sufficiently by adjusting the signal processing units and control signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a tri-gate structure is used to reduce the number of source drivers, then the cost is reduced and the number of data lines is reduced, but the charging time for each pixel is reduced to one-third of the conventional time, causing insufficient charging
Solution Approach 1:
The patent applies periodic action by dividing the frame into multiple sub-frames and cycling through different charging orders for subpixels in alternating frames. In odd frames, the charging order is G1→G2→G3, while in even frames, it is G3→G2→G1. This periodic alternation ensures that each subpixel type receives adequate charging time across different frames, resolving the insufficient charging issue caused by the tri-gate structure's reduced charging time.
Solution Approach 2:
The patent implements dynamics by making the charging order flexible and adaptive rather than fixed. The control unit dynamically adjusts the charging sequence of subpixels based on the frame number, switching between different charging orders for different frames. This dynamic adjustment allows the system to optimize charging distribution across all subpixels while maintaining the cost benefits of the tri-gate structure.
2Device complexity
If subpixels are charged in a fixed order within the same horizontal synchronization cycle, then the charging process is simple, but subpixels with earlier charging order receive insufficient charge due to RC delay
Solution Approach 1:
The patent uses periodic action to alternate the charging order of subpixels between different frames. In odd frames, subpixels are charged in the order G1→G2→G3, while in even frames, the order is reversed to G3→G2→G1. This periodic alternation compensates for the RC delay effect, ensuring that no single subpixel consistently receives insufficient charge, thereby improving charging uniformity without significantly increasing system complexity.
Solution Approach 2:
The patent applies inversion by reversing the charging order of subpixels in alternating frames. Instead of maintaining a fixed charging order, the system inverts the sequence in alternate frames, so that subpixels that would normally be charged later are charged earlier in inverted frames. This inversion strategy balances out the RC delay effects and achieves uniform charging across all subpixels.
3Manufacturing precision
If extra gate pulses or overlap gate pulses are used to pre-charge subpixels, then charging inequality is avoided, but power consumption increases
Solution Approach 1:
The patent employs periodic action to alternate the charging order of subpixels in different frames, achieving uniform charging distribution without requiring additional gate pulses. By cycling through different charging sequences, the system naturally balances the charging received by each subpixel type, eliminating charging inequality while avoiding the power consumption penalty of extra pre-charging pulses.
Solution Approach 2:
The patent implements self-service by using the existing data driving signal and natural pixel structure to achieve uniform charging, rather than relying on additional dedicated pre-charging pulses. The system leverages the alternating frame structure and subpixel arrangement to self-compensate for charging inequalities, thereby maintaining charging uniformity without the power consumption overhead of extra gate pulses or overlap pulses.
Data Source
AI summary
The present invention discloses a driving module for a liquid crystal display device. The driving module includes a data line signal processing unit, for generating a plurality of data driving signals, a scan line signal processing unit, for generating a plurality of gate driving signals, and a control unit, for controlling the data line signal processing unit and the gate line signal processing unit, such that a plurality of sub-pixels corresponding to a data line are with different charging orders in different frames, or are charged with different charging periods in a same frame.