Color Filter Substrate with Varying Dielectric Thickness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional liquid crystal display devices suffer from liquid crystal phase errors and color shift issues due to uniform electric field distributions, leading to reduced transmittance and brightness variations when viewed from different angles.
Innovation Solution
A color filter substrate with a dielectric layer of varying thicknesses in each pixel unit, aligned with an array substrate, disperses the deflection directions of liquid crystal molecules, reducing color shift and enhancing transmittance by optimizing the distribution of equipotential lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform dielectric layer is formed on the first common electrode, then the manufacturing process is simple, but color shift occurs due to limited liquid crystal molecule orientations
Solution Approach 1:
The dielectric layer is designed with different thicknesses in different regions (first thickness in a first region, second thickness in a second region). This local variation in dielectric layer thickness creates different electric field strengths in different regions, causing liquid crystal molecules to orient in multiple directions. This resolves the color shift problem by increasing the diversity of liquid crystal orientations while maintaining a relatively simple manufacturing process using conventional coating methods.
2Illumination intensity
If the dielectric layer thickness is increased uniformly, then the transmittance is improved, but the color shift problem persists due to uniform electric field distribution
Solution Approach 1:
Instead of uniformly increasing the dielectric layer thickness, the invention applies different thicknesses locally: a first thickness in a first region and a second thickness in a second region. This local differentiation maintains improved transmittance (as the overall dielectric layer is thicker than conventional designs) while simultaneously creating electric field variations that induce multiple liquid crystal orientations, thereby eliminating color shift.
3Device complexity
If strip-shaped pixel electrodes and strip-shaped second common electrodes are used, then the device structure is simplified, but liquid crystal phase error occurs causing black lines
Solution Approach 1:
The invention maintains the simplified strip-shaped electrode structure but introduces local quality variation through the dielectric layer thickness distribution. The different thicknesses in different regions create varying electric field strengths that compensate for the phase errors caused by the strip-shaped electrode configuration, preventing black lines while maintaining structural simplicity.
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 effectively reduces color shift and improves brightness consistency across different viewing angles while increasing transmittance by dispersing the deflection directions of liquid crystal molecules, thereby enhancing the display performance.
Implementation Method 1
the amount of vertical equipotential lines distributed in the liquid crystal layer is also increased, thus the TFT-LCD having the structure shown in FIG. 2 may facilitate transition of the liquid crystal molecules from an upright state to an inclined state
Implementation Method 2
a dielectric layer (over coater) 106 is formed on the first common electrode 105 of the color filter substrate 101, wherein the dielectric layer 106 is typically made of insulating material such as acrylic resin
Data Source
AI summary
The present invention provides a color filter substrate and a liquid crystal display device, belongs to the field of liquid crystal display technology, and can overcome the color shift problems in existing liquid crystal display device. The color filter substrate of the present invention comprises: a first substrate, a black matrix and a color film layer provided on the first substrate, wherein the color film layer comprises a plurality of pixel units arranged periodically and repeatedly in a matrix, each pixel unit includes at least two sub-pixels of different colors, each sub-pixel comprises a color filter film, a first common electrode disposed on the color filter film, and a dielectric layer disposed on the first common electrode, wherein the thicknesses of the dielectric layer at at least two locations within each pixel unit are different.