Reflective LCD Cell Gap Optimization via Layer Thickness
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Solution Overview
Problem
Reflective LCD devices face challenges in achieving desired color representation and luminance due to variations in cell gaps and filter thicknesses, which affect phase retardation and reflectance, making it difficult to optimize both color composition and luminance simultaneously.
Innovation Solution
The implementation of a reflective LCD device structure with defined red, green, and blue color filters and organic layers, where the thickness of the third organic layer is greater than the first and second layers, and the blue color filter is thicker than the green color filter, allowing for optimized cell gaps and independent adjustment of each display area's cell gap to enhance luminance and color accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If uniform thickness is used for all organic layers and color filters, then manufacturing is simpler, but color representation and luminance cannot be optimized simultaneously
Solution Approach 1:
The patent applies local quality by varying the thickness of organic layers and color filters at different spatial locations. Specifically, the third organic layer has greater thickness than the first and second organic layers, and the blue color filter is thicker than the green color filter. This localized thickness variation allows optimization of phase retardation and reflectance for each display area (red, green, blue, white) to achieve desired color representation and luminance.
Solution Approach 2:
The patent changes the physical parameter of layer thickness to optimize optical performance. By adjusting the thickness of the third organic layer to be greater than the first and second organic layers, and making the blue color filter thicker than the green color filter, the patent optimizes phase retardation and reflectance characteristics for different display areas, thereby improving color representation and luminance.
2Manufacturing precision
If cell gap is standardized across all display areas, then manufacturing is easier, but phase retardation and reflectance cannot be optimized for each color
Solution Approach 1:
The patent implements local quality by creating different cell gap dimensions for different display areas. The varied thickness of organic layers and color filters naturally creates multi-cell gap structures where each display area (red, green, blue, white) has optimized cell gap dimensions for its specific color requirements, enabling independent optimization of phase retardation and reflectance for each color.
3Use of energy by moving object
If reflector is added to create reflective LCD, then power consumption and weight are reduced, but color accuracy and luminance control become more difficult
Solution Approach 1:
The patent changes the thickness parameters of organic layers and color filters to optimize the optical performance of the reflective LCD. By making the third organic layer thicker than the first and second organic layers, and the blue color filter thicker than the green color filter, the patent achieves desired phase retardation and reflectance values, thereby improving color accuracy and luminance control in the reflective display mode.
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
This approach enables improved luminance and color representation by optimizing phase retardation and reflectance across different display areas, allowing for a desired color sense and reduced reflectance variation, thus enhancing the overall performance of the reflective LCD device.
Implementation Method 1
variations in cell gaps and filter thicknesses, which affect phase retardation and reflectance
Implementation Method 2
first, second, and third organic layers having transmittance for white light... red color filter... green color filter... blue color filter
Implementation Method 3
a reflective LCD devices is a device that controls the light transmittance by reflecting natural light or external artificial light using a reflector
Data Source
AI summary
A display device includes: a substrate at which red, green, blue, and white display areas are defined; first, second, and third organic layers having transmittance for white light and disposed on the substrate at the green, blue, and white display areas, respectively; a red color filter on the substrate at the red display area; a green color filter on the first organic layer at the green display area; and blue color filter on the second organic layer at the blue display area. A thickness of the third organic layer is greater than each of thicknesses of the first and second organic layers.