Oxide TFT Light Blocking Film Hole Stabilization
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Solution Overview
Problem
The electric characteristics of TFTs with oxide semiconductor films are prone to changes due to both electric stress and light absorption, leading to display errors in conventional display panels.
Innovation Solution
A display panel configuration where a light blocking film with a hole is used to allow light to reach the TFTs, counteracting the changes caused by light absorption and stabilizing the electric characteristics by reversing the direction of electric stress applied to the TFTs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light blocking film is disposed to overlap the TFT in a plan view to prevent light leakage and increase contrast, then the contrast of displayed image is improved, but the TFT electric characteristics change due to light absorption
Solution Approach 1:
The patent extracts the light blocking function from the continuous light blocking film by introducing a hole (light transmission region) at the position overlapping the TFT. This allows light to reach the TFT while the surrounding light blocking film continues to prevent light leakage in other areas, thus maintaining display contrast while stabilizing TFT electric characteristics.
Solution Approach 2:
The patent applies local quality by creating a spatial differentiation in the light blocking film: the region overlapping the TFT has light transmission properties (hole), while other regions maintain light blocking properties. This localized modification ensures that only the necessary area receives light to stabilize TFT characteristics without compromising overall display contrast.
2Stability of the object's composition
If electric stress is applied to the TFT to stabilize electric characteristics, then the electric characteristics stability is improved, but unnecessary voltage is applied to the TFT
Solution Approach 1:
The patent converts the harmful effect of light absorption (which causes TFT electric characteristic changes) into a beneficial effect. By allowing light to reach the TFT through the hole in the light blocking film, the light absorption stabilizes the electric characteristics, eliminating the need for additional electric stress or unnecessary voltage application.
3Object-affected harmful factors
If the light blocking film is made continuous to maximize light blocking effect, then the light leakage prevention is improved, but the TFT cannot receive light and electric characteristics change
Solution Approach 1:
The patent segments the continuous light blocking film by introducing a hole (light transmission region) at the position overlapping the TFT. This segmentation creates distinct functional zones: light blocking regions to prevent light leakage and a light transmission region to allow light reaching the TFT, thus simultaneously achieving both objectives.
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 stabilizes the TFTs' electric characteristics, reducing the occurrence of display errors and ensuring reliable operation by canceling out the changes caused by light absorption and electric stress.
Implementation Method 1
the electric characteristics that are changed by absorption of light by the TFT
Implementation Method 2
the light blocking film having a hole in a position overlapping the transistor in a plan view
Data Source
AI summary
A display panel displaying an image includes a first substrate, a second substrate disposed opposite the first substrate, electric optical substance sealed between the first substrate and the second substrate, a transistor disposed on the first substrate and supplying an electric signal to the electric optical substance and including an oxide semiconductor film as an activating layer, and a light blocking film disposed on the second substrate and blocking visible light from transmitting therethrough, the light blocking film having a hole in a position overlapping the transistor in a plan view.