Gate Driver Protection Layer for Display Device Moisture and Light Shielding
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Solution Overview
Problem
Gate driver circuits in display devices are prone to moisture ingress and scratches during manufacturing, and amorphous silicon semiconductor layers experience electric leakage when exposed to sunlight, leading to reduced yield and reliability.
Innovation Solution
A circuit protection structure is implemented with a protection layer on the second isolation layer of the gate driver, which may include a light shielding layer, and is made of materials like titanium or aluminum, reducing moisture ingress and electric leakage by shielding from light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the gate driver is directly disposed adjacent to the edge of the glass substrate to decrease the number of integrated circuits, then the device complexity and cost are reduced, but the gate driver becomes more vulnerable to moisture ingress and scratches during manufacturing
Solution Approach 1:
The patent applies preliminary action by forming the protection layer and light shielding layer on the gate driver structure before final assembly and packaging. This preemptive protective coating prevents moisture ingress and light exposure to the amorphous silicon layer, addressing reliability concerns before they can manifest during operation or testing.
Solution Approach 2:
The protection layer and light shielding layer serve as intermediary elements between the gate driver circuit and the external environment. These intermediate layers block moisture and light from directly contacting the vulnerable gate driver components, particularly the amorphous silicon semiconductor layer, thereby maintaining reliability without increasing device complexity.
2Ease of operation
If the amorphous silicon semiconductor layer is exposed to sunlight or strong light, then the display device can function normally, but electric leakage occurs in the gate driver inducing abnormal output signal
Solution Approach 1:
The light shielding layer acts as an intermediary barrier between the amorphous silicon semiconductor layer and external light sources. This intermediate layer blocks sunlight and strong light from reaching the photosensitive amorphous silicon, preventing electric leakage and abnormal output signals while allowing the display device to function normally.
Solution Approach 2:
The patent applies local quality by selectively providing light shielding protection only to the gate driver region containing the amorphous silicon layer, rather than shielding the entire display device. This targeted approach maintains the light-sensitive functionality of the display while protecting the vulnerable semiconductor layer from light-induced electric leakage.
3Ease of manufacture
If the gate driver is exposed to moisture during manufacturing, then the manufacturing process can proceed, but the yield rate and product reliability are affected
Solution Approach 1:
The protection layer is formed as a preliminary protective barrier before the gate driver is fully assembled and packaged. This early protective coating prevents moisture ingress during subsequent manufacturing steps, testing, and handling, thereby maintaining high yield rates and product reliability without impeding the manufacturing process.
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 prevents moisture and scratches, enhancing the yield and reliability of display devices, and maintaining normal operation even under sunlight exposure.
Implementation Method 1
a light shielding layer, such that the protection layer is between the light shielding layer and the second isolation layer
Implementation Method 2
the probability of moisture entering the circuit region of the gate driver may be effectively reduced
Data Source
AI summary
A circuit protection structure applied to a gate driver that is in a display panel (GIP) is provided. The gate driver has a first metal layer, a first isolation layer, a semiconductor layer, a second metal layer, and a second isolation layer. The first metal layer, the first isolation layer, the semiconductor layer, the second metal layer, and the second isolation layer are stacked in sequence. The circuit protection structure includes a protection layer. The protection layer is located on the second isolation layer.