Electro-Optical Pixel Structure With 3D Light Blocking for TFT Leakage
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Solution Overview
Problem
Existing electro-optical devices, such as liquid crystal display devices, fail to sufficiently block light from incident on semiconductor layers, leading to operational failures and reduced display quality.
Innovation Solution
The device incorporates a first light blocker coupled to the drain region of the semiconductor layer, with a drain contact portion overlapping the blocker and a shorter distance to the substrate, along with additional light blockers to enhance light blocking, particularly around the low-concentration drain region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking film and scan lines are arranged to block light incident on semiconductor films, then light blocking is provided, but sufficient blockage of light is not achieved
Solution Approach 1:
The patent extends light blocking from a two-dimensional planar arrangement to a three-dimensional structure by forming the light blocker that protrudes from the first substrate toward the semiconductor layer. This vertical extension into the third dimension creates multiple blocking surfaces that effectively intercept light incident on the semiconductor layer from various angles, achieving sufficient light blocking that planar arrangements cannot provide.
Solution Approach 2:
The patent introduces a light blocker as an intermediary structure between the substrate and the semiconductor layer. This intermediate element actively intercepts and blocks light before it reaches the semiconductor layer, preventing the harmful effect of light-induced photocurrent without interfering with the electrical connections or other functional components.
2Reliability
If the contact portion is positioned closer to the substrate, then electrical connection is improved, but light blocking effectiveness may be reduced
Solution Approach 1:
The patent applies different functional qualities to different parts of the light blocker structure. The lower portion near the substrate provides electrical connection and structural support, while the upper portion extends toward the semiconductor layer to provide light blocking. This local differentiation of function allows the structure to simultaneously achieve both electrical connectivity and optical protection.
Solution Approach 2:
The light blocker extends in the vertical dimension from the substrate toward the semiconductor layer, creating a three-dimensional structure that performs multiple functions at different heights. The electrical connection is established at the lower level while light blocking is achieved at the upper level, resolving the conflict between these two requirements through spatial separation in the vertical dimension.
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
This configuration effectively suppresses light entry into the semiconductor layer, reducing photocurrent-induced operation failures and improving display quality by minimizing off-state leakage currents and black spot generation.
Implementation Method 1
a first light blocker disposed between the semiconductor layer and the pixel electrode... effectively suppresses light entry into the semiconductor layer
Data Source
AI summary
An electro-optical device includes a substrate; a pixel electrode; a transistor disposed between the substrate and the pixel electrode and including a semiconductor layer having a source region, a drain region, and a channel region, and a gate electrode; and a first light blocker disposed between the semiconductor layer and the pixel electrode, the first light blocker includes a drain coupled portion coupled to the drain region, the semiconductor layer includes a boundary portion between the channel region and the drain region, the drain region includes a contact portion that is in contact with the first light blocker and overlaps with the first light blocker in a plan view, and a first distance between the contact portion and the substrate is shorter than a second distance between the boundary portion and the substrate.