LCD Panel Dielectric Layer Thickness Calibration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional LCD panels face color deviation issues due to different phase differences of light beams with varying wavelengths passing through liquid crystal molecules, which are currently addressed by adjusting the thickness of color filters, increasing manufacturing costs and reducing yield and reliability.
Innovation Solution
The LCD panel incorporates a dielectric layer with varying thicknesses corresponding to red, green, and blue pixel regions, calibrating phase differences by adjusting the thickness of the dielectric layer to create different cell gaps between the array and color filter substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the thickness of color filters is adjusted to calibrate phase differences, then color deviation is corrected, but manufacturing cost increases and yield and reliability decrease
Solution Approach 1:
The patent applies local quality by forming the dielectric layer with different thicknesses in different pixel regions (red, green, and blue regions have different dielectric layer thicknesses). This local variation in dielectric layer thickness compensates for the wavelength-dependent phase differences in liquid crystal molecules, correcting color deviation without requiring different color filter thicknesses. The dielectric layer's localized thickness adjustment replaces the conventional approach of adjusting color filter thickness, thereby avoiding increased manufacturing complexity and cost.
2Object-affected harmful factors
If the thickness of color filters is adjusted to calibrate phase differences, then color deviation is corrected, but manufacturing cost increases and yield and reliability decrease
Solution Approach 1:
The patent forms the dielectric layer with spatially varying thickness directly on the array substrate during the TFT manufacturing process. The dielectric layer thickness is locally adjusted in red, green, and blue pixel regions to compensate for phase differences. This approach eliminates the need to adjust color filter thickness, thereby maintaining color filter uniformity and avoiding the reliability issues and yield losses associated with modifying color filters after they are manufactured.
3Object-affected harmful factors
If the thickness of color filters is adjusted to calibrate phase differences, then color deviation is corrected, but manufacturing cost increases
Solution Approach 1:
The patent merges the dielectric layer formation step with the existing TFT manufacturing process. The dielectric layer is formed as part of the array substrate fabrication sequence, integrating the color compensation function into the standard manufacturing flow. This integration eliminates the need for separate color filter thickness adjustment processes, thereby reducing overall manufacturing complexity and cost while achieving color deviation correction.
Data Source
AI summary
An LCD panel includes an array substrate, a color filter substrate positioned above the array substrate, a dielectric layer disposed on the array substrate facing the color filter substrate, and a liquid crystal layer interposed between the array substrate and the color filter substrate. The color filter substrate includes a plurality of red pixel regions, green pixel regions, and blue pixel regions, and the dielectric layer has different thickness corresponding to the red pixel regions, the green pixel regions, and the blue pixel regions. Accordingly, the liquid crystal layer has a first thickness corresponding to the blue pixel regions, a second thickness corresponding to the green pixel regions, and a third thickness corresponding to the red pixel regions. The first thickness is less than the second thickness, and the second thickness is less than the third thickness.