Array Substrate Slit Design for LCD Grayscale Uniformity
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Solution Overview
Problem
In liquid crystal display apparatuses, temperature variations caused by backlight sources lead to inconsistent light efficiency across the display panel, resulting in non-uniform grayscale due to the temperature-dependent refractive index and dielectric constant of liquid crystals.
Innovation Solution
The array substrate is designed with a first electrode featuring pixels with slit widths and inter-slit distances that increase from the side closer to the backlight source to the opposite side, compensating for temperature gradients by adjusting the electrode cycle to maintain uniform transmissivity and grayscale.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the backlight source is positioned close to the array substrate to provide sufficient illumination, then the illumination intensity is improved, but temperature gradient across the display panel increases causing non-uniform grayscale
Solution Approach 1:
The patent applies local quality by making the slit widths and inter-slit distances non-uniform across different regions of the array substrate. Specifically, pixels closer to the backlight source have smaller slit widths and inter-slit distances, while pixels farther away have larger dimensions. This local variation compensates for the temperature gradient caused by proximity to the backlight source, ensuring uniform light efficiency and grayscale across the entire display panel.
2Use of energy by moving object
If the slit width is increased to improve light efficiency, then the light efficiency is improved, but the inter-slit distance must be adjusted to maintain pixel structure and uniformity
Solution Approach 1:
The patent employs parameter changes by systematically varying the slit width and inter-slit distance parameters across different pixel locations. The slit width and inter-slit distance are designed to increase for pixels located farther from the backlight source, where temperature is lower and liquid crystal light efficiency is reduced. This parameter adjustment compensates for temperature-induced efficiency variations while maintaining overall uniformity in the display.
Data Source
AI summary
An array substrate and a liquid crystal display apparatus are disclosed. The array substrate includes a substrate and a first electrode formed on the substrate. The array substrate includes a first side and a second side that is opposite to the first side. The first electrode includes multiple pixels and each pixel includes multiple slits. A slit width of at least one slit close to the second side and an inter-slit distance between the at least one slit and another slit adjacent to the at least one slit are greater than a slit width of a first slit close to the first side and an inter-slit distance between the first slit and another slit adjacent to the first slit, respectively. The liquid crystal display apparatus has uniform grayscale in different positions from the first side close to the backlight source to the second side opposite to the first side.