Liquid Crystal Display Spare Wire Amplitude Control
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Solution Overview
Problem
Conventional liquid crystal display devices with multi-pixel configurations, such as the source direct multi-pixel type, face challenges in reducing viewing angle dependence of color reproducibility and suffer from poor mass productivity due to difficulties in repairing disconnection of source bus lines.
Innovation Solution
A liquid crystal display device with a source direct multi-pixel configuration that includes a spare wire for electrical connection to disconnected source bus lines, and a control circuit that adjusts the amplitude of display signal voltages to minimize visual impact of disconnections, allowing for arbitrary control of grayscale levels between sub-pixels based on the color displayed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a source direct multi-pixel configuration is used to improve viewing angle characteristics, then the viewing angle dependence of gamma characteristic is reduced, but the device complexity increases due to multiple source bus lines required for each sub-pixel
Solution Approach 1:
The patent combines multiple source bus lines into a single shared source bus line that supplies display signal voltages to multiple sub-pixels. The voltages are differentiated through capacitance division using storage capacitances connected to each sub-pixel, rather than requiring separate physical bus lines for each sub-pixel.
Solution Approach 2:
A single source bus line is designed to serve multiple functions by supplying display signal voltages to multiple sub-pixels simultaneously. The storage capacitances enable the same bus line to provide different effective voltages to different sub-pixels, achieving multi-functionality without increasing the number of physical connections.
2Reliability
If conventional multi-pixel configurations are used to reduce viewing angle dependence, then gamma characteristic improves, but mass productivity deteriorates due to difficulties in repairing disconnection of source bus lines
Solution Approach 1:
The patent segments the voltage control function into individual storage capacitances connected to each sub-pixel. This segmentation allows independent voltage adjustment for each sub-pixel while sharing a common source bus line, enabling easier repair since a single disconnected bus line affects multiple sub-pixels that can be individually compensated through capacitance control.
Solution Approach 2:
Storage capacitances are introduced as intermediary elements between the shared source bus line and individual sub-pixels. These capacitances enable voltage differentiation and provide a mechanism to compensate for bus line disconnections by adjusting the stored charge, thereby maintaining display functionality despite physical connection issues.
3Reliability
If multiple source bus lines are provided for each sub-pixel to enable arbitrary voltage control, then color reproducibility improves, but the ease of manufacture deteriorates
Solution Approach 1:
The patent changes the control parameter from physical bus line configuration to electrical capacitance values. By adjusting the capacitance values in the storage capacitances, different effective voltages are achieved for each sub-pixel without requiring different physical connections, greatly simplifying the manufacturing process while maintaining color reproducibility.
Data Source
AI summary
When a first source bus line (SA) or a second source bus line (SB) which is associated with a pixel of one column is electrically connected with a spare wire (AL1), a control circuit (15B) of a liquid crystal display device (100B) according to an embodiment of the present invention is capable of controlling the amplitudes of the oscillation of a first display signal voltage and a second display signal voltage output to the first source bus line (SA) and the second source bus line (SB) so as to be smaller than that achieved when the first source bus line (SA) or the second source bus line (SB) is not electrically connected with the spare wire (AL1).