Conductive Light Shielding Layer for Wide-Angle Display Protection
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Solution Overview
Problem
In display devices, the light shielding layer near the thin film transistor is ineffective at wide angles due to a large distance from the transistor, leading to light leakage and potential display failures when made of conductive materials, complicating the structure with routing wiring.
Innovation Solution
A display device with a conductive light shielding layer covering the upper and side surfaces of an organic insulating layer, electrically coupled with a common electrode, which holds a gap between substrates and efficiently shields light from wide angles while maintaining a stable potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the area of the light shielding layer is made large to increase light shielding capability, then the light shielding capability is improved, but the aperture ratio is decreased
Solution Approach 1:
The light shielding layer is extended from a planar structure to a three-dimensional structure by forming it on both the upper surface and side surfaces of the organic insulating layer. This vertical extension into the third dimension allows the light shielding layer to block light from wide angles without increasing its planar footprint, thus maintaining the aperture ratio while improving light shielding capability.
Solution Approach 2:
The light shielding layer is nested on the organic insulating layer, utilizing the insulating layer's structure as a foundation. This nesting approach allows the light shielding layer to achieve enhanced shielding performance through the insulating layer's height while avoiding direct contact with the thin film transistor, thus preventing electrical interference without requiring additional routing wiring.
2Object-affected harmful factors
If the light shielding layer is formed of conductive material to increase light shielding capability, then the light shielding capability is improved, but the potential stability deteriorates and display failure may occur
Solution Approach 1:
The organic insulating layer serves as an intermediary between the conductive light shielding layer and the thin film transistor. This intermediary structure allows the light shielding layer to be made of conductive material for effective light shielding while preventing direct electrical contact with the transistor, thus maintaining potential stability and avoiding display failure.
3Reliability
If routing wiring is provided in the counter substrate to fix the potential of the light shielding layer, then the potential stability is improved, but the device complexity increases
Solution Approach 1:
The need for routing wiring is extracted and eliminated by using the common electrode as the potential reference. The light shielding layer is electrically connected to the common electrode through the organic insulating layer, which provides a simple and effective potential fixation method without requiring additional routing wiring structures.
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 shields light from wide angles without reducing the aperture ratio and stabilizes the potential of the light shielding layer, reducing the likelihood of display failures.
Implementation Method 1
the organic insulating layer and the light shielding layer hold a gap between the first substrate and the second substrate
Implementation Method 2
a conductive light shielding layer covering an upper surface and a side surface of the organic insulating layer... effectively shields light from wide angles
Data Source
AI summary
A display device according to one aspect of the present invention includes a first substrate including a thin film transistor, a second substrate including a common electrode, an organic insulating layer arranged on the first substrate so as to overlap with the thin film transistor, and projecting from the first substrate toward the second substrate, and a conductive light shielding layer covering an upper surface and a side surface of the organic insulating layer, and electrically coupled with the common electrode, wherein the organic insulating layer and the light shielding layer hold a gap between the first substrate and the second substrate.