Reflective Display Color Filter with Segmented Insulating Layers
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Solution Overview
Problem
Reflective liquid crystal display devices with a color filter on the counter substrate face challenges in achieving high color purity and uniform thickness, leading to dark displays in low light conditions, and suffer from low adhesion between the color filter and the substrate, increasing development time and cost.
Innovation Solution
A display device with a pixel electrode layer acting as a reflective electrode, featuring a coloring layer with specific openings to adjust color purity and adhesion, and using inorganic and organic insulating layers to enhance interface adhesion and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the thickness of the color filter is increased to improve color purity, then color purity is improved, but manufacturing precision deteriorates due to difficulty in making uniform thickness all over substrate surface
Solution Approach 1:
The color filter is divided into multiple layers (first color filter layer and second color filter layer) with different functions. The first layer provides color filtering while the second layer enhances reflected light intensity, allowing each layer to be optimized independently for both uniformity and brightness.
Solution Approach 2:
The patent uses a composite structure combining organic color filter materials with inorganic insulating layers. This composite approach allows the organic layer to provide color purity while the inorganic layer ensures uniform thickness and adhesion, resolving the contradiction between color purity and manufacturing precision.
2Strength
If a photosensitive resin film with dispersed coloring material is used for the color filter, then color purity can be adjusted, but adhesion between the color filter and substrate deteriorates due to insufficient photocuring
Solution Approach 1:
The color filter system is segmented into multiple functional layers. The photosensitive resin layer with dispersed coloring material provides color purity, while separate inorganic insulating layers provide adhesion and structural support, compensating for the adhesion weakness of the photosensitive layer.
Solution Approach 2:
Inorganic insulating layers are introduced as intermediary layers between the photosensitive resin color filter and the substrate. These intermediary layers improve adhesion and provide structural stability, compensating for the insufficient adhesion of the photosensitive resin material itself.
3Illumination intensity
If external light is transmitted through the color filter twice in a reflective display device, then color purity of reflected light is improved, but brightness deteriorates when external light is relatively weak
Solution Approach 1:
The color filter is divided into two layers with distinct functions: the first layer maintains color purity while the second layer is optimized to enhance reflected light intensity. This segmentation allows the system to achieve both high color purity and high brightness even with weak external light.
Solution Approach 2:
The patent changes the optical parameters of the color filter by introducing a second layer with different thickness and material properties. This parameter change allows the second layer to enhance reflected light intensity without significantly compromising the color purity established by the first layer.
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 improves color purity and adhesion, resulting in a more productive and efficient reflective display with enhanced reflectance and reduced contact failures, suitable for high-resolution displays.
Implementation Method 1
light such as external light is transmitted through the color filter, reflected by a reflective film or the like, and transmitted through the color filter again
Implementation Method 2
a pixel electrode layer over the insulating layer... The coloring layer includes at least a first opening and a second opening
Data Source
AI summary
A novel display device capable of adjusting color purity is provided. A novel display device with improved adhesion of a color filter is provided. A novel display device capable of excellent reflective display is provided. The display device includes a transistor, a reflective electrode layer formed on the same surface as a source electrode layer or a drain electrode layer of the transistor, a first insulating layer over the reflective electrode layer, a coloring layer which is over the first insulating layer and overlaps with the reflective electrode layer, a second insulating layer over the coloring layer, and a pixel electrode layer over the second insulating layer. The coloring layer includes at least a first opening and a second opening. The pixel electrode layer is electrically connected to the transistor through the first opening. The second insulating layer is in contact with the first insulating layer in the second opening.