Display Device Light Blocking Layer Absorbing 540-680nm
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Solution Overview
Problem
Conventional display devices using overlapping color filters for light blocking exhibit insufficient light leakage prevention compared to dedicated light blocking members.
Innovation Solution
A display device design incorporating a light blocking portion with a first-color layer, a third-color layer, and a fourth-color layer, where the fourth-color layer absorbs light in the 540 nm to 680 nm wavelength range, enhancing the light blocking effect, and including a liquid crystal layer configuration to minimize light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If overlapping color filters are used for light blocking, then manufacturing process is simplified, but light blocking effect is insufficient
Solution Approach 1:
The light blocking portion is constructed as a composite structure comprising multiple color layers (first-color layer, third-color layer, and fourth-color layer) with different materials and optical properties. This composite structure achieves superior light blocking performance across multiple wavelength ranges while maintaining compatibility with the color filter manufacturing process, thereby resolving the contradiction between manufacturing simplicity and light blocking effectiveness.
Solution Approach 2:
The light blocking function is segmented into multiple specialized layers: the first-color layer and third-color layer handle specific wavelength ranges, while the fourth-color layer specifically targets the 540-680 nm range. This segmentation allows each layer to be optimized for its specific function, achieving comprehensive light blocking without requiring a completely separate light blocking member.
2Reliability
If a separate light blocking member is formed, then light blocking effect is improved, but manufacturing process complexity increases
Solution Approach 1:
The light blocking portion is merged with the color filter structure, forming an integrated component rather than a separate element. The multiple color layers are formed using the same manufacturing processes as the color filters, combining the light blocking function with the existing color filter fabrication workflow and reducing overall device complexity.
Solution Approach 2:
The light blocking portion serves multiple functions: it blocks light in the 540-680 nm wavelength range, prevents light leakage between pixel electrodes, and maintains compatibility with the color filter manufacturing process. This multi-functionality eliminates the need for separate dedicated light blocking members while achieving superior light blocking performance.
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 proposed solution effectively reduces undesirable light leakage by improving the light blocking capability, achieving satisfactory absorbance and blocking performance across the specified wavelength range.
Implementation Method 1
a fourth-color layer overlapping over the first-color and third-color layers and absorbing a light having a wavelength in a range from 540 nm to 680 nm
Data Source
AI summary
A display device includes: a substrate; a gate line disposed on the substrate; a data line intersecting the gate line; a plurality of thin film transistors connected to each of the gate line and the data line; a plurality of pixel electrodes connected to each of the plurality of thin film transistors; first-color, second-color and third-color filters, respectively, overlapping the plurality of pixel electrodes; and a light blocking portion disposed between two adjacent pixel electrodes of the plurality of pixel electrodes, wherein the light blocking portion comprises: a first-color layer comprising a substantially same material as that included in the first-color filter; a third-color layer comprising a substantially same material as that included in the third-color filter; and a fourth-color layer overlapping over the first-color and third-color layers and absorbing a light having a wavelength in a range from 540 nm to 680 nm.