3D LCD Panel Black Picture Insertion Circuit
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Solution Overview
Problem
The shutter type 3D stereoscopic technology faces crosstalk issues due to high refresh frequency requirements, leading to increased power consumption, cost, lower brightness, and shorter charge time for liquid crystal displays, when using black-insertion technology to eliminate crosstalk.
Innovation Solution
A liquid crystal display panel with specific configurations of data lines, scanning lines, pixels, and control transistors, where control and pixel transistors are turned on during blank time domains to invert scanning sequences, allowing for reduced refresh frequency and effective black picture insertion, thereby reducing power consumption and enhancing brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If black-insertion technology is used to eliminate crosstalk in shutter type 3D display, then crosstalk is reduced, but refresh frequency requirement increases to 240 Hz
Solution Approach 1:
The patent implements periodic black frame insertion between left-eye and right-eye frames in shutter type 3D display. The black frame is inserted periodically at specific timing intervals to eliminate crosstalk, allowing the refresh frequency to be reduced from 240 Hz to 60 Hz while maintaining crosstalk elimination effectiveness.
2Object-affected harmful factors
If refresh frequency is increased to 240 Hz for black-insertion technology, then crosstalk is eliminated, but power consumption increases
Solution Approach 1:
The patent uses periodic black frame insertion instead of continuous high-frequency refresh. By inserting black frames only at necessary intervals between left-eye and right-eye frames, the system eliminates crosstalk while maintaining the display refresh frequency at a lower 60 Hz, thereby significantly reducing power consumption compared to continuous 240 Hz operation.
3Object-affected harmful factors
If refresh frequency is increased to 240 Hz for black-insertion technology, then crosstalk is eliminated, but brightness of display screen decreases
Solution Approach 1:
The patent implements periodic black frame insertion at controlled intervals rather than continuous high-frequency refresh. This approach eliminates crosstalk by blocking light only during necessary transition periods between left-eye and right-eye frames, while maintaining higher brightness during the actual display periods at a lower overall refresh frequency of 60 Hz.
4Object-affected harmful factors
If refresh frequency is increased to 240 Hz for black-insertion technology, then crosstalk is eliminated, but charge time for liquid crystal capacitor decreases
Solution Approach 1:
The patent uses periodic black frame insertion with extended display periods at 60 Hz refresh rate. This provides sufficient charge time for liquid crystal capacitors during the longer display intervals between black frame insertions, eliminating the insufficient charge time problem that occurs with rapid 240 Hz switching while still maintaining effective crosstalk elimination.
Data Source
AI summary
An LCD panel includes multiple data lines, multiple scanning lines, multiple pixels, and multiple control transistors. Each pixel connected with a corresponding one of the data lines and one of the scanning lines. Gate electrodes of the control transistors are connected with a same scanning line. A source electrode of each control transistor is connected with a corresponding one of the data lines. Drain electrodes of the control transistors are connected with each other. A black picture insertion method for the LCD panel displayed in a 3D mode is also disclosed. Accordingly, a refresh frequency of the driving circuit is one half of the prior art. The power consumption and cost are reduced. Besides, a black picture is inserted into one frame during a blank time domain of the one frame such that the brightness is increased and the charge time of the liquid crystal capacitor is increased.