Display Apparatus Light Source Control for Moving Image Quality
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Solution Overview
Problem
Conventional liquid crystal display apparatuses face challenges in improving moving image quality due to delays in transitioning from full transmittance to zero transmittance, and the complexity of controlling diaphragm mechanisms on a frame-by-frame basis.
Innovation Solution
A display apparatus with a liquid crystal display control unit that controls pixels based on a video signal, and a light source control unit that stops light emission during a predetermined period within the frame period, specifically at the ends of the frame period to mask non-black display states caused by liquid crystal response delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a black display period is inserted into the video signal to improve moving image quality, then display quality is improved, but a delay time exists for liquid crystal transmittance transition which reduces the effectiveness
Solution Approach 1:
The patent extracts the harmful effect of liquid crystal response delay by introducing a light source control unit that stops light emission during the black display period. This separates the black display function into two parts: liquid crystal transmittance control and light source control, allowing the system to mask the delay period effectively without being constrained by liquid crystal response time limitations.
Solution Approach 2:
The light source control unit acts as an intermediary between the video signal and the displayed image. By controlling the light source to stop emission during the black display period, it mediates the transition and masks the liquid crystal response delay, allowing the system to achieve sharp black levels without being limited by liquid crystal response characteristics.
2Manufacturing precision
If a diaphragm mechanism is fully closed during the black display period to improve moving image quality, then display quality is improved, but the control becomes complicated on a frame-by-frame basis
Solution Approach 1:
The patent replaces the mechanical diaphragm mechanism with an electronic light source control system. Instead of using a mechanical component that opens and closes during the black display period, the system uses a light source control unit to stop light emission electronically, thereby achieving the same black level effect without mechanical complexity or frame-by-frame control requirements.
Data Source
AI summary
In a display element, each pixel is controlled to an ON state and OFF state in accordance with a video signal. Each pixel of the display element is controlled to an OFF state in a first period shorter than a predetermined frame period, the first period including at least one of a front end and a rear end of the frame period of the video signal. In addition, light emission of a light source that emits light on the display element is stopped in a second period including the first period.