Thermochromic Bending Protection Layer for Display Data Drivers
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Solution Overview
Problem
Conventional display devices with bending areas lack effective protection mechanisms for the data driver and printed circuit board, leading to potential damage from external impacts and light exposure, which compromises their durability and reliability.
Innovation Solution
A display device with a thermochromic bending protection layer that includes a reversible thermochromic pigment, which changes light transmittance and color based on temperature, is applied to the data driver and printed circuit board. The layer is transparent at higher temperatures during curing to enhance exposure sensitivity and becomes opaque at lower temperatures to provide light blocking protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional protection layer is applied to the data driver and bending area, then mechanical protection is provided, but light exposure efficiency during curing is reduced
Solution Approach 1:
The protection layer incorporates a thermochromic pigment that changes its light transmittance properties based on temperature. During curing when the layer is heated, the pigment becomes transparent to allow maximum light exposure. After cooling, it turns opaque to provide light blocking protection for the data driver.
Solution Approach 2:
The protection layer transitions from a static light-blocking layer to a dynamic layer that automatically adjusts its optical properties in response to temperature changes. This dynamic behavior allows the same layer to serve both curing and protection functions at different stages.
2Object-affected harmful factors
If the protection layer is made opaque to block light, then data driver protection is improved, but curing exposure efficiency deteriorates
Solution Approach 1:
The thermochromic pigment in the protection layer changes its optical transmission parameter in response to temperature changes. At elevated temperatures during curing, the layer becomes transparent to UV light, allowing efficient curing. After cooling to operating temperature, it becomes opaque to block harmful light from reaching the data driver.
3Strength
If a thick protection layer is applied to enhance protection, then mechanical durability is improved, but light transmission during curing is reduced
Solution Approach 1:
The thermochromic property allows the protection layer to maintain its thickness for mechanical protection while dynamically adjusting light transmittance. During curing, the heated transparent state allows light to penetrate through the full thickness of the layer. After cooling, the opaque state provides enhanced light blocking without compromising the mechanical protection already provided by the layer's thickness.
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 thermochromic bending protection layer improves the mechanical reliability and durability of the display device by protecting the data driver and printed circuit board from external impacts and light, while maintaining high exposure efficiency during curing.
Implementation Method 1
The bending protection layer may include a thermochromic pigment having a light transmittance that varies according to a temperature
Implementation Method 2
providing light having a first wavelength region to the preliminary bending protection layer to form a bending protection layer
Data Source
AI summary
A display device includes a display panel including a first area, a second area, and a bending area disposed between the first area and the second area, the bending area having a curvature radius, a data driver disposed on the display panel and overlapping the second area in a plan view, and a bending protection layer disposed on the display panel and the data driver and overlapping the first area in a plan view, the bending area, and the second area. The bending protection layer includes a thermochromic pigment having a light transmittance that varies according to a temperature.