Projection Device Optical Path Shifting Timing
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Solution Overview
Problem
Existing projection devices face challenges in achieving high resolution and efficient image display due to the mixing of pre-switch and post-switch image states on the screen, caused by optical path shifting, which requires rapid writing of scanning lines and leads to insufficient writing time.
Innovation Solution
A projection device with a display panel and optical path shifting element, where each pixel circuit includes capacitance elements and a light-emitting element, allowing the optical path to be shifted between multiple paths during light-out periods, ensuring sufficient writing time and maintaining the optical path during light-emission periods, thereby preventing image state discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical path shifting is performed during scanning line writing, then image resolution is improved, but image mixing occurs between pre-switch and post-switch states
Solution Approach 1:
The patent applies preliminary action by completing all scanning line writing operations before initiating optical path shifting. The display panel writes all scanning lines during a first period, then shifts the optical path during a light-out period after writing is complete. This ensures that the entire image is written in a consistent state before shifting, preventing mixing of pre-switch and post-switch image states.
2Reliability
If optical path shifting is performed after horizontal scanning completion, then image mixing is prevented, but writing time becomes insufficient
Solution Approach 1:
The patent implements periodic action by dividing the display cycle into distinct periods: a first period for writing scanning lines, a light-out period for optical path shifting, and a second period for maintaining the shifted optical path during light emission. This periodic structure ensures sufficient writing time in the first period while performing shifting in the light-out period when no light emission occurs, thus preventing image mixing without sacrificing writing time.
3Measurement precision
If optical path shifting is performed during light emission, then resolution enhancement is achieved, but image quality deteriorates due to mixing
Solution Approach 1:
The patent applies preliminary action by completing all scanning line writing operations before initiating optical path shifting. The display panel writes all scanning lines during a first period, then shifts the optical path during a light-out period after writing is complete. This ensures that the entire image is written in a consistent state before shifting, preventing mixing of pre-switch and post-switch image states.
Solution Approach 2:
The patent implements periodic action by dividing the display cycle into distinct periods: a first period for writing scanning lines, a light-out period for optical path shifting, and a second period for maintaining the shifted optical path during light emission. This periodic structure ensures sufficient writing time in the first period while performing shifting in the light-out period when no light emission occurs, thus preventing image mixing without sacrificing writing time.
Data Source
AI summary
In a pixel circuit including a first capacitance element and a second capacitance element, in a writing sub-frame, a voltage corresponding to a gray scale level is held in a first capacitance element, a plurality of OLEDs are off in a vertical scanning line flyback period after the writing sub-frame, and in a light-emitting sub-frame after the vertical scanning line flyback period, a current corresponding to the voltage held in the first capacitance element is supplied to the OLED, and the voltage corresponding to the gray scale level is held in the second capacitance element. In an optical path shifting element, an optical path is shifted in the vertical scanning line flyback period, and in the light-emitting sub-frame, the optical path is stabilized.