Light-Shielding Layer in LCD Backlight Burst Mode
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Solution Overview
Problem
LCD devices experience noise in picture quality due to capacitance variations caused by the conductive and nonconductive states of semiconductor layers during burst mode backlight operation, which affects power consumption and fabrication complexity.
Innovation Solution
Incorporating a light-shielding layer between the substrate and semiconductor layer to block light from exciting the semiconductor layer, reducing capacitance noise and power consumption by ensuring the semiconductor layer remains nonconductive during backlight off cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the backlight unit is driven in burst mode to reduce power consumption, then energy efficiency is improved, but noise in picture quality increases due to capacitance variations
Solution Approach 1:
A light-shielding layer is introduced as an intermediary between the light source and the semiconductor layer. This layer blocks light from reaching the semiconductor layer during backlight off cycles, preventing unwanted photoconductive effects that cause capacitance variations and picture quality noise, while allowing the burst mode operation to continue for power savings.
2Manufacturing precision
If five masks are used to form the thin film transistor array substrate, then manufacturing precision is improved, but device complexity and fabrication cost increase
Solution Approach 1:
The light-shielding layer is merged with the data line structure, allowing both the light-shielding function and the data line function to be achieved in a single fabrication step. This integration reduces the total number of mask steps from five to four, simplifying the fabrication process while maintaining the necessary precision for both the light-shielding layer and data line formation.
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 light-shielding layer effectively blocks light from exciting the semiconductor layer, reducing noise and power consumption while simplifying the fabrication process by potentially reducing the number of mask steps required in the thin film transistor array substrate formation.
Implementation Method 1
The light-shielding layer is formed between the substrate and the semiconductor layer. Some or all of the light directed towards the semiconductor layer by the light source is blocked by the light-shielding layer.
Data Source
AI summary
A liquid crystal display (LCD) device partially or substantially blocks light from a light source from exciting a semiconductor layer. The LCD device includes a substrate, a semiconductor layer, a light-shielding layer, and a light source. The light source directs light toward a lower surface of the substrate. The light-shielding layer is formed between the substrate and the semiconductor layer. Some or all of the light directed towards the semiconductor layer by the light source is blocked by the light-shielding layer.