Liquid Crystal Display Drive Capability Adjustment
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Solution Overview
Problem
In liquid crystal display devices, the longer wires from the signal generator to the pixels result in increased wire resistance, leading to variance in brightness and chromaticity due to blunted voltage waveforms, causing differences in charge voltage between pixels connected to shorter and longer wires.
Innovation Solution
A liquid crystal display device configuration where the signal generator varies the drive capability of output ends based on wire length, using current controllers to shape input voltage waveforms, ensuring they remain within a specific range to minimize variance in brightness and chromaticity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of source drivers is reduced using a tri-gate structure, then cost is reduced, but wire length increases causing voltage waveform blunting and brightness variance
Solution Approach 1:
The patent applies local quality by making the drive capability of each output end adjustable according to its specific wire length. Each output end is configured with different drive capabilities tailored to its local condition (wire length), rather than using a uniform drive capability for all output ends. This resolves the contradiction by maintaining brightness uniformity (manufacturing precision) while allowing the use of fewer source drivers (ease of manufacture).
Solution Approach 2:
The patent changes the parameter of drive capability from a fixed value to a variable that depends on wire length. By adjusting the drive capability parameter according to the specific wire length connected to each output end, the system compensates for voltage waveform blunting in longer wires while maintaining appropriate drive levels for shorter wires, thus preventing brightness variance despite reduced source driver count.
2Area of stationary object
If wire length increases to connect farther pixels, then more pixels can be covered by fewer source drivers, but wire resistance increases causing voltage waveform blunting
Solution Approach 1:
The patent applies local quality by configuring each output end with a drive capability specifically matched to its wire length. Output ends connected to longer wires have higher drive capabilities to compensate for increased resistance and waveform blunting, while output ends connected to shorter wires have lower drive capabilities. This localized adjustment maintains voltage waveform quality across the entire coverage area despite varying wire lengths.
Solution Approach 2:
The patent introduces dynamics by making the drive capability adjustable and variable rather than fixed. The drive capability can be dynamically adjusted based on wire length characteristics, allowing the system to adapt to different wire conditions and maintain reliable voltage waveforms across the expanded coverage area.
3Ease of manufacture
If wire length increases, then fewer source drivers are needed, but charge voltage difference occurs between pixels on longer and shorter wires
Solution Approach 1:
The patent applies local quality by assigning different drive capabilities to different output ends based on their specific wire length conditions. This localized customization ensures that each output end compensates appropriately for its wire's resistance characteristics, maintaining uniform charge voltage across all pixels even though fewer source drivers are used.
Solution Approach 2:
The patent applies preliminary action by pre-configuring the drive capability of each output end according to its wire length before operation. This preliminary adjustment ensures that voltage waveform blunting is compensated in advance, preventing charge voltage differences between pixels on longer and shorter wires while enabling the use of fewer source drivers.
Data Source
AI summary
A liquid crystal display device comprises a display panel, at least one signal generator, and a plurality of wires. The display panel has a plurality of input ends to receive data signal. The at least one signal generator has a plurality of output ends to supply the data signal to the input ends of the display panel, respectively. The wires connects the output ends of the at least one signal generator to the input ends of the display panel, respectively, the wires having lengths measured between the output ends of the at least one signal generator and the input ends of the display panel, respectively, the length of the wires being different from each other according to location of the output ends of the at least one signal generator.