Projection Display Optical Path Shifting for Missing Video Data
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Solution Overview
Problem
In projection-type display apparatuses, existing techniques for increasing resolution by optical path shifting result in missing video data being visually recognized due to improper projection positions.
Innovation Solution
A projection-type display apparatus with a liquid crystal panel, an optical path shifting element, and a display control circuit that shifts the projection position of panel pixels for each unit period within a frame period, and supplies data signals to panel pixels based on pixel data and gray scale levels to ensure complete video image representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical path shifting is used to increase resolution, then resolution is improved, but video data becomes missing in certain projection positions
Solution Approach 1:
The patent divides the frame period into multiple unit periods (k unit periods) and assigns different panel pixels to different projection positions in each unit period. This segmentation allows each panel pixel to contribute to different spatial locations at different times, ensuring complete video data representation while maintaining high resolution through the optical path shifting element.
Solution Approach 2:
The patent employs periodic action by cycling through k different projection positions over k unit periods within one frame period. The optical path shifting element systematically shifts the projection position of panel pixels in a periodic manner, allowing each pixel to serve multiple spatial positions across different time intervals, thereby preventing data loss while achieving high resolution.
2Measurement precision
If panel pixels are shifted to multiple projection positions, then resolution is increased, but control complexity increases
Solution Approach 1:
The patent implements dynamics by making the projection position of panel pixels variable rather than fixed. The optical path shifting element dynamically adjusts the projection position based on the unit period, allowing the system to adaptively map panel pixels to different spatial positions. This dynamic approach enables high resolution without requiring a static complex control system, as the positioning is managed through time-varying optical path adjustment.
Solution Approach 2:
The patent applies preliminary action by pre-dividing the frame period into k unit periods and pre-establishing the mapping between panel pixels and projection positions for each unit period. The display control circuit is configured in advance to manage the optical path shifting element according to this predetermined schedule, simplifying the real-time control requirements while maintaining high resolution capability.
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 solution effectively suppresses the lack of display by ensuring that all video pixels are expressed by panel pixels, maintaining image quality and preventing visual recognition of missing data.
Implementation Method 1
an optical path shifting element configured to shift a position of a projection pixel projected from the plurality of panel pixels for each of k unit periods from a first unit period to a k-th unit period
Implementation Method 2
a liquid crystal panel including a plurality of panel pixels
Data Source
AI summary
A projection-type display apparatus including a liquid crystal panel including a plurality of panel pixels, an optical path shifting element configured to shift a position of a projection pixel for each of unit periods, included in one frame period, and a display control circuit configured to control the liquid crystal panel and the optical path shifting element. The display control circuit supplies a data signal to the plurality of panel pixels per the unit period, supplies a signal based on pixel data, as the data signal, to a peripheral panel pixel arranged at a periphery among the plurality of panel pixels in a unit period as a part in one frame period, and supplies a signal having a gray scale level equal to or less than a threshold value as the data signal in a unit period other than the unit period as the part in the one frame period.