Array Substrate Light-Blocking Layer for TFT Backlight Stability
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Solution Overview
Problem
Liquid crystal display devices are affected by light and temperature sensitivity, leading to instability and poor display effects such as crosstalk and residual images due to the sensitivity of amorphous silicon semiconductor materials in the array substrate.
Innovation Solution
An array substrate with a light-blocking and heat-insulating layer is introduced, comprising light-absorbing and light-reflecting materials that form a light-blocking body with the light-reflecting materials dispersed within, to block light and insulate heat, thereby reducing the impact of backlight emission on the active layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the array substrate is illuminated by backlight, then the display panel can produce images through liquid crystal refraction, but the thin film transistor is affected by photogenerated carriers and temperature rise, causing instability and poor display quality
Solution Approach 1:
The patent introduces a light-blocking and heat-insulating layer as an intermediary between the backlight module and the array substrate. This layer blocks harmful light and heat from directly reaching the thin film transistor, thereby protecting the array substrate stability while maintaining necessary illumination for display function
Solution Approach 2:
The light-blocking and heat-insulating layer is constructed using composite materials including light-absorbing materials (such as carbon black, titanium dioxide, zinc oxide) and light-reflecting materials (such as aluminum powder, silver powder). This composite structure simultaneously achieves light blocking and heat insulation functions to protect the array substrate
2Object-affected harmful factors
If a light-blocking layer is added to protect the active layer, then light-blocking performance improves, but the device structure becomes more complex
Solution Approach 1:
The light-blocking and heat-insulating layer is designed to perform multiple functions simultaneously: light blocking, heat insulation, and electrical insulation. By consolidating these functions into a single layer rather than using separate layers for each function, the patent reduces overall structural complexity while maintaining comprehensive protection
Solution Approach 2:
The patent optimizes the thickness of the light-blocking and heat-insulating layer to be between 0.5-3 μm, and adjusts the particle size and concentration of light-absorbing and light-reflecting materials to achieve optimal light-blocking performance with minimal additional structural complexity
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 effectively reduces crosstalk and residual images, improving the stability and product quality of the display panel by blocking light and heat, enhancing the light-blocking and heat-insulating performances.
Implementation Method 1
The light-blocking and heat-insulating layer includes light-absorbing materials and light-reflecting materials
Implementation Method 2
The light-blocking and heat-insulating layer includes light-absorbing materials and light-reflecting materials
Implementation Method 3
a thin film transistor (TFT) of the array substrate will be affected by double effects of photogenerated carriers and a temperature rise
Implementation Method 4
The light-blocking and heat-insulating layer is arranged on a side of the active layer and configured to block light and insulate heat for the active layer
Data Source
AI summary
A display device, a display panel, and an array substrate are provided. The array substrate includes an active layer and a light-blocking and heat-insulating layer. The light-blocking and heat-insulating layer is arranged on a side of the active layer and configured to block light and insulate heat for the active layer. The light-blocking and heat-insulating layer includes light-absorbing materials and light-reflecting materials. One of the light-absorbing materials and the light-reflecting materials form a light-blocking body. The other one of the light-absorbing materials and the light-reflecting materials are dispersed in the light-blocking body.