LCD Aperture Ratio via Gate Line ALS Merging
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Solution Overview
Problem
Conventional liquid crystal display (LCD) devices face challenges in achieving a high pixel aperture ratio due to the presence of active level shift (ALS) lines, which reduce the aperture ratio and make it difficult to obtain a slim outer black matrix, leading to signal delay and increased power consumption.
Innovation Solution
The solution involves removing the ALS driver and using a gate driver that outputs two levels of gate-low voltage to boost the pixel voltage, thereby eliminating the need for ALS lines and reducing the width of the outer black matrix, while maintaining the functionality of ALS circuits through varying gate-low voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If ALS lines are added to reduce power consumption, then power consumption is reduced, but pixel aperture ratio decreases and outer black matrix width increases
Solution Approach 1:
The patent merges the ALS line function into the gate line structure by making the gate line serve dual purposes: as a gate control line and as an ALS line. This is achieved by extending the gate line to provide ALS voltage to previous pixel rows while maintaining its primary gate control function, thereby eliminating separate ALS lines and increasing aperture ratio
Solution Approach 2:
The gate line is designed to perform multiple functions: it serves as the gate control line for current pixels and simultaneously as the ALS line for previous pixel rows. This multi-functionality eliminates the need for dedicated ALS lines, reducing the overall circuit complexity and increasing the aperture ratio while maintaining power consumption benefits
2Use of energy by moving object
If ALS lines are added to reduce power consumption, then power consumption is reduced, but outer black matrix width increases
Solution Approach 1:
The patent combines the ALS line routing with the gate line routing, allowing the gate line to extend into the black matrix area and serve as both gate control and ALS supply. This merging eliminates the need for separate ALS line routing that would otherwise increase the black matrix width
Solution Approach 2:
The patent utilizes the time dimension by providing ALS voltage to previous pixel rows during their hold period before the current gate line is activated. This temporal separation allows the gate line to serve dual purposes without spatial conflict, reducing the required black matrix width
3Area of stationary object
If transparent electrodes are used to increase aperture ratio, then aperture ratio increases, but signal delay increases due to high electric resistance
Solution Approach 1:
The patent introduces an intermediary aluminum oxide layer between the transparent electrode and the underlying structure. This intermediary layer serves as an effective electrical conductor that reduces the high resistance of transparent electrodes, thereby minimizing signal delay while maintaining the aperture ratio benefits of transparent electrodes
Data Source
AI summary
A display device having active level shift (ALS) lines and ALS drivers connected to the ALS lines removed from the display device, and a gate line at a rear end pixel area is used instead of the ALS line to obtain the effect of the ALS lines. Accordingly, a pixel aperture ratio may be increased and a width of an outer black matrix may be reduced.