LCD Panel Electrode Spacing Adjustment for Luminance Uniformity
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Solution Overview
Problem
Liquid crystal display (LCD) panels experience non-uniform luminance distribution due to signal degradation caused by wiring resistance, which is exacerbated in halftone display mode, failing to meet medical standards for luminance uniformity in both full contrast and halftone modes.
Innovation Solution
Adjusting the electrode spacing between the pixel electrode and the common electrode based on signal degradation, and varying the substrate interval to optimize transmittance uniformity, achieved by modifying the manufacturing process of the TFT substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the wiring length is increased to connect distant pixels, then more pixels can be covered, but signal degradation increases due to wiring resistance
Solution Approach 1:
The patent applies local quality by making the electrode spacing non-uniform across the display panel. Pixels closer to the terminal area have smaller electrode spacing, while pixels farther away have larger electrode spacing. This local variation compensates for signal degradation caused by wiring resistance, ensuring uniform luminance across the entire display area without requiring excessive wiring length extensions.
2Speed
If the electrode spacing is increased to reduce capacitance, then switching speed improves, but transmittance uniformity deteriorates
Solution Approach 1:
The patent implements local quality by varying the electrode spacing according to position. In regions where signal degradation is severe (far from terminals), larger spacing compensates for the degradation. In regions near terminals, smaller spacing maintains precise transmittance control. This position-dependent spacing strategy simultaneously achieves fast switching and uniform transmittance across the display.
3Reliability
If the wiring resistance is reduced to improve signal quality, then signal degradation decreases, but device complexity increases
Solution Approach 1:
Instead of modifying wiring resistance through complex wiring structures or additional materials, the patent changes the electrode spacing parameter. This simple geometric parameter adjustment effectively compensates for signal degradation without increasing device complexity. The solution uses existing structural elements (electrodes) with modified dimensions rather than introducing new complex components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution ensures uniform luminance distribution across the entire LCD panel in both full contrast and halftone display modes, meeting medical standards by compensating for signal degradation and wiring resistance effects.
Implementation Method 1
an electric field arises between the pixel electrode 39 and the common electrode 40, and this field rotates liquid crystal molecules. Transmittance through the panel for the light from the backlight unit 33 changes, depending on the rotation angle of the liquid crystal molecules.
Data Source
AI summary
A liquid crystal display panel includes a TFT connected to wiring equipped with an input terminal; a pixel electrode connected to the TFT; and a common electrode opposed to the pixel electrode, wherein an electrode spacing between the pixel electrode and the common electrode is adjusted depending on the amount of a signal degradation that arises from a signal flow from the input terminal through the wiring to the TFT.