LCD Panel Flatness via Segmented Color Conversion and Planarization
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Solution Overview
Problem
Liquid crystal display (LCD) devices face challenges in achieving improved flatness of the layer below the polarizer, which affects polarization efficiency and overall display performance.
Innovation Solution
The implementation of a liquid crystal display device structure that includes a substrate with a blue light blocking filter, color pattern layers with wavelength converting particles, a black matrix, a planarization layer, and a polarizer, along with a method of manufacturing that involves forming these layers to enhance flatness and light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional LCD structure is used, then manufacturing is simpler, but flatness of the layer below the polarizer deteriorates
Solution Approach 1:
The color pattern layer is divided into multiple discrete color conversion units (red, green, blue) that are spaced apart from each other. This segmentation allows each unit to be independently formed and positioned, enabling better control over the overall flatness of the layer structure while maintaining the necessary color conversion functionality.
Solution Approach 2:
The patent introduces a planarization layer specifically in regions where flatness is compromised by the color pattern structures. This local addition of material compensates for height variations without requiring complete restructuring of the entire device, thus improving flatness selectively where needed.
2Reliability
If the layer below the polarizer is not planarized, then manufacturing is easier, but polarization efficiency deteriorates
Solution Approach 1:
The planarization layer is formed in advance, before the polarizer is applied to the display panel. This preliminary planarization ensures that the surface is sufficiently flat to support the polarizer with optimal contact, thereby maximizing polarization efficiency without requiring complex adjustments during later manufacturing steps.
3Area of stationary object
If color pattern layers are closely spaced, then display area is larger, but flatness control becomes more difficult
Solution Approach 1:
The patent introduces a black matrix as an intermediary element positioned between the color conversion units. This black matrix serves multiple functions: it optically isolates adjacent color units to prevent color contamination, and it provides a reference plane that facilitates the formation of the planarization layer, thereby maintaining flatness control even when color units are closely spaced to maximize display area.
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 configuration improves the flatness of the display panel, enhances light emission efficiency, and reduces manufacturing costs by self-aligning the black matrix, thereby improving the polarization efficiency and overall performance of the LCD device.
Implementation Method 1
a red color conversion unit on the blue light blocking filter, the red color conversion unit configured to convert a light into a light having a red wavelength; and a green color conversion unit on the blue light blocking filter, the green color conversion unit configured to convert a light into a light having a green wavelength
Data Source
AI summary
A liquid crystal display device and a method of manufacturing the same are provided. The LCD device includes a substrate including a display area and a non-display area, a blue light blocking filter on the substrate, a plurality of color pattern layers spaced apart from one another in a plan view, a black matrix among the plurality of color pattern layers in a plan view, a planarization layer on the color pattern layer and the black matrix, and a polarizer on the planarization layer. The color pattern layer includes a red color conversion unit on the blue light blocking filter, which converts a light into a light having a red wavelength and a green color conversion unit on the blue light blocking filter, which converts a light into a light having a green wavelength. The red color conversion unit and the green color conversion unit include wavelength converting particles.