3D Display Control Timing for LCD Ghosting Elimination
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Solution Overview
Problem
Conventional LCD displays face issues with 'ghosting' of images due to slow response times when attempting to implement stereo viewing methods similar to CRT monitors, which require altering shutter glass control and enlarging vertical blanking intervals, leading to increased manufacturing costs and incompatible display specifications.
Innovation Solution
A method that increases the frame refresh rate of input signals to generate output signals with additional vertical blanking intervals, allowing control signals for shutter glasses to be adjusted during specific durations to ensure each eye receives a full image without enlarging the vertical blanking interval, effectively separating and timing the display content for left and right eyes within existing frame structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If time sequential stereo viewing is implemented on LCD with alternating shutter glass control, then stereo viewing capability is achieved, but ghosting occurs due to slow pixel response time
Solution Approach 1:
The patent applies preliminary action by controlling the shutter glass to open before the corresponding image frame is fully ready, and keeping it open during the vertical blanking interval when the image data is being transferred. This allows the LCD pixels sufficient time to respond and stabilize before the shutter closes, eliminating ghosting while maintaining stereo viewing capability
Solution Approach 2:
The patent implements dynamic timing adjustment by synchronizing shutter glass control with the display refresh cycle and vertical blanking interval. The shutter timing is dynamically adapted to match the image transfer schedule, allowing optimal viewing windows for each eye while accommodating the LCD's pixel response characteristics
2Reliability
If vertical blanking interval is enlarged to buffer display content, then full image reception is ensured, but timing specification compatibility is lost and manufacturing cost increases
Solution Approach 1:
The patent achieves universality by designing a stereo display system that operates within the standard vertical blanking interval timing specifications. The same display controller and panel timing circuits can be used for both 2D and 3D modes without requiring specially made timing or redesign, allowing manufacturers to share elements between displays and panels
Solution Approach 2:
The patent applies parameter changes by adjusting the shutter glass control timing parameters to work within the existing vertical blanking interval constraints. Instead of enlarging the VBI, the system modifies when the shutter opens and closes relative to the image frame timing, ensuring full image reception while maintaining standard timing specifications
Data Source
AI summary
A representative Device and Method for 3-D Display Control is disclosed. The method for controlling stereo image display is disclosed. That is, to receive an image input signal wherein the image input signal includes a first refresh rate; to convert a frame rate of the image input signal to generate an image output signal, wherein the image output signal includes a second refresh rate which is higher than the first refresh rate, and includes a first image signal, a first VBI (Vertical Blanking Interval), a second image signal, a second VBI, a third image signal and a third VBI; to output a control signal for a left eye shutter of shutter glasses during a duration between the first VBI and a part of the second image signal; and to output a control signal for a right eye shutter of the shutter glasses during a duration between a part of the third image signal and the third VBI.