Groove-Embedded Light Converting Layer for Display Reliability
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Solution Overview
Problem
Conventional display devices face challenges in achieving high light efficiency and color reproducibility due to the exposure of light converting layers to external factors, which can lead to reduced display quality and reliability.
Innovation Solution
A display device design featuring a first display substrate with a recessed groove containing a light converting layer, protected by a protection layer, and a light shielding layer, along with a liquid crystal layer between substrates, enhances light conversion and prevents foreign substance entry, while a manufacturing method forms the substrate with etched grooves and applied light converting materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the light converting layer is exposed to the outside environment, then the manufacturing process is simpler, but the display quality and reliability deteriorate due to foreign substance entry and light leakage
Solution Approach 1:
The base substrate is segmented by forming grooves that divide the space above it into separate regions. The light converting layer is placed within these grooves, effectively segmenting it from the external environment. This segmentation prevents foreign substances from reaching the light converting layer while maintaining a relatively simple manufacturing process.
Solution Approach 2:
The light converting layer is nested within the grooves of the base substrate, and further nested within the protection layer that covers the grooves. This nested structure protects the light converting layer from external factors without requiring a completely separate encapsulation system, thus maintaining manufacturing simplicity while improving reliability.
2Reliability
If the light converting layer is protected by adding grooves and protection layers, then the reliability and display quality improve, but the device complexity increases
Solution Approach 1:
Instead of providing uniform protection across the entire substrate surface, the protection is applied locally where needed - specifically within the grooves that contain the light converting layer. The protection layer is formed to cover only the necessary areas, reducing overall device complexity while providing adequate protection for the sensitive light converting materials.
Solution Approach 2:
The protection approach moves from a two-dimensional planar protection layer to a three-dimensional structure using grooves with depth. This dimensional change allows the light converting layer to be physically isolated within the groove cavities, providing effective protection without requiring an overly complex multi-layer protection system.
3Reliability
If quantum dots or quantum rods are used in the light converting layer, then color reproducibility improves, but the sensitivity to external factors and manufacturing complexity increases
Solution Approach 1:
The grooves are formed in the base substrate before the light converting layer is deposited or placed. This preliminary action creates a protected environment in advance, allowing quantum dots or quantum rods to be introduced into the grooves without direct exposure to external contaminants during the manufacturing process, thus enabling the use of sensitive materials while controlling complexity.
Solution Approach 2:
The protection layer acts as an intermediary between the external environment and the quantum dots or quantum rods in the light converting layer. This intermediary structure allows the sensitive quantum materials to achieve high color reproducibility while being shielded from degrading external factors, without requiring direct handling or exposure during manufacturing.
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 display quality and reliability by protecting the light converting layer and reducing light leakage, resulting in higher light efficiency and color reproducibility.
Implementation Method 1
The light converting layer includes at least one of a quantum dot and a quantum rod. The light emitted from the backlight unit may be an ultraviolet ray or a blue light.
Implementation Method 2
a protection layer on the light converting layer in the groove and on the first surface of the base substrate
Implementation Method 3
The first display substrate may further include a light shielding layer disposed on the first surface of the base substrate and overlapped with the non-display area
Data Source
AI summary
A display device includes a display panel including a first display substrate and a backlight unit. The first display substrate includes a base substrate in which a groove is recessed from a first surface thereof, a light converting layer in the groove, and a protection layer overlapping the light converting layer in the groove and the first surface of the base substrate.