Projector Light Intensity Control for Rapid Liquid Crystal Valve Warming
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Projectors using liquid crystal light valves in cool environments experience delayed warming and degraded display quality due to slow response speed, leading to prolonged periods of reduced light intensity and uncomfortable viewing experiences during startup.
Innovation Solution
An image display device that adjusts light intensity based on image luminance features and suppresses light reduction when the liquid crystal light valves are in a cool state, ensuring they are heated promptly by maintaining light intensity, thereby accelerating temperature rise and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the adaptive dimming process is performed to expand the grayscale range and improve contrast, then the light intensity is reduced and the dynamic range is expanded, but the liquid crystal light valves are heated slowly and the display quality is degraded during startup
Solution Approach 1:
The patent applies dynamics by making the dimming control adaptive and time-dependent. The control section dynamically adjusts the dimming amount based on the elapsed time since startup, transitioning from a first dimming control (less dimming) during the startup period to a second dimming control (more dimming) after the startup period. This dynamic adjustment resolves the contradiction by allowing aggressive dimming for contrast enhancement only after the liquid crystal light valves have been sufficiently heated, while permitting higher light intensity during startup to ensure rapid warming.
Solution Approach 2:
The patent applies preliminary action by implementing a startup period during which the liquid crystal light valves are pre-heated with higher light intensity before the full adaptive dimming process is activated. The control section determines the startup period has elapsed and switches from the first dimming control to the second dimming control. This preliminary heating action resolves the contradiction by ensuring the liquid crystal light valves reach optimal operating temperature before contrast enhancement through dimming is applied, preventing display quality degradation.
2Manufacturing precision
If the light intensity is reduced by the dimming device to expand grayscale range, then the effective grayscale number is increased, but the period for degraded display quality is prolonged during startup
Solution Approach 1:
The patent applies dynamics by making the dimming control adaptive and time-dependent. The control section dynamically adjusts the dimming amount based on the elapsed time since startup, transitioning from a first dimming control (less dimming) during the startup period to a second dimming control (more dimming) after the startup period. This dynamic adjustment resolves the contradiction by allowing aggressive dimming for contrast enhancement only after the liquid crystal light valves have been sufficiently heated, while permitting higher light intensity during startup to ensure rapid warming.
Solution Approach 2:
The patent applies preliminary action by implementing a startup period during which the liquid crystal light valves are pre-heated with higher light intensity before the full adaptive dimming process is activated. The control section determines the startup period has elapsed and switches from the first dimming control to the second dimming control. This preliminary heating action resolves the contradiction by ensuring the liquid crystal light valves reach optimal operating temperature before contrast enhancement through dimming is applied, preventing display quality degradation.
3Speed
If the projector is started in a cool environment, then the liquid crystal light valves are in a cool state with slow response speed, but rapid warming is needed to improve response speed and display quality
Solution Approach 1:
The patent applies preliminary action by implementing a startup period during which the liquid crystal light valves are pre-heated with higher light intensity before the full adaptive dimming process is activated. The control section determines the startup period has elapsed and switches from the first dimming control to the second dimming control. This preliminary heating action resolves the contradiction by ensuring the liquid crystal light valves reach optimal operating temperature before contrast enhancement through dimming is applied, preventing display quality degradation.
Solution Approach 2:
The patent applies periodic action by dividing the operation into distinct periods: a startup period with first dimming control for rapid heating, and a normal operation period after the startup period with second dimming control for contrast enhancement. The control section transitions between these periodic phases based on whether the startup period has elapsed. This periodic structure resolves the contradiction by ensuring rapid warming during the critical startup phase before response speed becomes a limiting factor.
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 reduces the duration of degraded display quality during startup by ensuring the liquid crystal light valves are warmed efficiently, enhancing contrast and maintaining consistent image luminance, thus providing a more comfortable viewing experience.
Implementation Method 1
a projector, which modulates a light emitted from a light source in accordance with an image signal using a light modulation device
Implementation Method 2
takes time from when the projector is started until the inside is warmed by the energy of the light emitted from the light source
Data Source
AI summary
An image display device adapted to display an image based on an image signal includes a light source, an adjustment section adapted to adjust light intensity of a light emitted from the light source based on a feature amount related to a luminance of the image, a modulation section adapted to modulate the adjusted light based on the image signal, and a control section adapted to suppress reduction of the light intensity by the adjustment section in a case in which a predetermined condition related to temperature of the modulation section is satisfied.