Metal Oxide Semiconductor LCD Aperture Ratio
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Solution Overview
Problem
Liquid crystal displays (LCDs) face challenges in increasing their aperture ratio due to the need for light-emitting elements like backlights, which affect visibility, and existing technologies have not effectively addressed this issue.
Innovation Solution
The use of a metal oxide semiconductor in the channel region of thin film transistors and the strategic placement of a light blocking member to allow light to pass through without reducing transistor performance, combined with a manufacturing method that forms a pixel electrode directly on the drain electrode and includes a passivation layer with a color filter, enhances the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light blocking member is formed on the second substrate to prevent light leakage, then display quality is improved, but the aperture ratio is reduced
Solution Approach 1:
The light blocking member is selectively removed from the region corresponding to the semiconductor layer, extracting the light-blocking function only from areas where it is not needed (non-semiconductor regions), thereby allowing light to pass through the semiconductor region and increase aperture ratio while still maintaining light blocking where required
Solution Approach 2:
The light blocking member is applied selectively to specific regions: it is formed in regions corresponding to gate electrodes and non-semiconductor portions, but deliberately omitted from regions corresponding to the semiconductor layer, creating local variations in light blocking properties to simultaneously achieve both light leakage prevention and high aperture ratio
2Area of stationary object
If the gate electrode width is reduced to increase aperture ratio, then light transmission is improved, but transistor control capability may be affected
Solution Approach 1:
The gate electrode width is optimized to a specific range (50-150 nm) that balances two competing requirements: narrow enough to allow sufficient light transmission for high aperture ratio, yet wide enough to maintain adequate gate control capability over the semiconductor channel, achieving a parameter optimization that satisfies both optical and electrical performance
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 approach increases the aperture ratio of LCDs by allowing light to pass through the semiconductor layer without causing leakage current, thereby improving visibility and efficiency.
Implementation Method 1
the semiconductor includes a metal oxide semiconductor, and the light blocking member is not formed in a region corresponding to at least a portion of the semiconductor
Implementation Method 2
A liquid crystal display controls the amount of light passing through a liquid crystal layer by applying a voltage to electrodes to create an electric field in the liquid crystal layer to realign liquid crystal molecules of the liquid crystal layer
Data Source
AI summary
A liquid crystal display according to an exemplary embodiment of the present invention includes a first substrate, a gate electrode formed on the first substrate, a gate insulating layer formed on the gate electrode, a semiconductor formed on the gate insulating layer, a source electrode and a drain electrode formed on the semiconductor, a second substrate that faces the first substrate, and a light blocking member formed on the second substrate, and the semiconductor includes a metal oxide semiconductor and the light blocking member is not formed in a region corresponding to at least a portion of the semiconductor.