Liquid Crystal Projector Optical Shift Velocity Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Liquid crystal projectors face image quality deterioration when usage conditions change, particularly due to temperature variations affecting the optical response of the liquid crystal panel, leading to reduced brightness and resolution during pixel shifting.
Innovation Solution
A liquid crystal projector with a temperature sensor to detect the panel's temperature and control the optical shift element's velocity, adjusting the shifting period and fixing period to maintain optimal image quality by synchronizing with the panel's optical response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the optical shift element shifts the emission optical path during the shifting period, then the resolution is artificially increased, but the brightness of the image decreases
Solution Approach 1:
The patent applies periodic action by dividing the display period into alternating shifting periods and fixing periods. During shifting periods, the optical shift element shifts the emission optical path to display different regions, and during fixing periods, it holds the optical path fixed to maintain brightness. This periodic switching resolves the contradiction between achieving high resolution through shifting and maintaining brightness by fixing.
2Manufacturing precision
If the optical shift element shifts the emission optical path, then the resolution is increased, but the quality of the projected image deteriorates when usage conditions change
Solution Approach 1:
The patent applies dynamics by making the shifting period and fixing period variable rather than fixed. The control unit adjusts the durations of shifting and fixing periods based on detected usage conditions (such as temperature changes affecting liquid crystal response). This dynamic adjustment ensures optimal image quality across different usage conditions while maintaining the resolution enhancement benefit.
Solution Approach 2:
The patent implements feedback by using a sensor to detect usage conditions and feeding this information back to the control unit. The control unit then adjusts the shifting and fixing period durations based on this feedback to compensate for changes in liquid crystal optical response, thereby maintaining reliable image quality under varying conditions.
3Illumination intensity
If the shifting period is extended to display movement images, then brightness is maintained, but the quality of the projected image deteriorates when usage conditions change
Solution Approach 1:
The patent resolves this contradiction by dynamically adjusting both the shifting period duration (for brightness) and the fixing period duration (for image quality) based on usage conditions. The control unit optimizes the balance between these two periods, extending the shifting period to maintain brightness while ensuring the fixing period is sufficient to prevent image quality deterioration, with both durations adapting to temperature and other usage condition changes.
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 solution prevents the visual recognition of transmittance or reflectance deviations at the projection position, thereby suppressing display quality deterioration and maintaining high-resolution image projection without the need for dedicated movement images.
Implementation Method 1
an optical shift element configured to shift an emission optical path of the modulated image generated by the liquid crystal panel
Data Source
AI summary
A liquid crystal projector includes a liquid crystal panel configured to generate a modulated image, a sensor configured to detect a temperature of the liquid crystal panel, an optical shift element configured to shift an emission optical path of the modulated image generated by the liquid crystal panel, and a control circuit configured to control a velocity of a shift in the optical shift element according to the temperature detected by the sensor.