Color Filter Substrate Slit Relocation for PVA Displays
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Solution Overview
Problem
Patterned vertical alignment (PVA) liquid crystal displays suffer from domain lines appearing in the light transmitting region, affecting transmittance and image quality due to uneven electric field distribution caused by slits in pixel electrodes.
Innovation Solution
A color filter substrate with a common electrode layer featuring slits, where the orthographic projections of these slits are within an opaque region on the array substrate, separated by sub-pixel units, preventing domain lines from appearing in the light transmitting region by ensuring orderly liquid crystal molecule arrangement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If slits are provided in pixel electrodes to achieve multi-domain display effect, then liquid crystal molecules can rotate in multiple directions, but domain lines appear in the light transmitting region due to uneven electric field distribution
Solution Approach 1:
The patent extracts the slits from the pixel electrodes and relocates them to the common electrode layer. This separation removes the harmful effect of slits from the light transmitting region while preserving the multi-domain display function through the repositioned slits in the common electrode.
Solution Approach 2:
The patent changes the vertical position (dimension) of the slits from the pixel electrode layer to the common electrode layer. This dimensional relocation allows the slits to function for multi-domain display while being positioned outside the light transmitting region, thus eliminating domain lines.
2Adaptability or versatility
If slits are provided in pixel electrodes, then liquid crystal molecules can have two rotation directions, but transmittance is reduced due to domain lines in the light transmitting region
Solution Approach 1:
The slits are extracted from the pixel electrodes and moved to the common electrode layer. This removes the obstruction to light transmission in the pixel electrode region while maintaining the dual rotation direction capability through the repositioned slits, thereby improving transmittance without sacrificing rotational versatility.
Solution Approach 2:
By relocating the slits to a different layer (common electrode layer instead of pixel electrode layer), the patent maintains the functional benefit of multiple rotation directions while eliminating the harmful effect on light transmittance caused by domain lines in the light transmitting region.
3Adaptability or versatility
If slits are provided in pixel electrodes, then multi-domain display is achieved, but image quality deteriorates due to domain lines
Solution Approach 1:
The slits are extracted from the pixel electrodes and relocated to the common electrode layer. This separation eliminates the domain lines that deteriorate image quality in the light transmitting region while preserving the multi-domain display function through the repositioned slits.
Solution Approach 2:
The patent applies a dimensional change by moving the slits to a different layer (common electrode layer), which allows multi-domain display to be achieved without the image quality degradation caused by domain lines in the light transmitting region.
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
Improves transmittance and image quality by maintaining a multi-domain display effect without domain lines in the light transmitting region, while maintaining a uniform color and consistent rotation directions of liquid crystal molecules.
Implementation Method 1
liquid crystal molecules have two rotation directions
Implementation Method 2
ensuring orderly liquid crystal molecule arrangement
Implementation Method 3
orthographic projections of the slits on the upper transparent substrate are within an opaque region of the color filter substrate
Data Source
AI summary
A color filter substrate, a display panel and a display device are provided. The color filter substrate includes a common electrode layer and an upper transparent substrate disposed over the common electrode layer. The common electrode layer is provided with a plurality of slits, and orthographic projections of the slits on the upper glass substrate are within an opaque region of the color filter substrate. Orthographic projections of slits in two adjacent rows on the upper transparent substrate are separated by at least two rows of sub-pixel units; or orthographic projections of slits in two adjacent columns on the upper transparent substrate are separated by at least two columns of sub-pixel units.