Pixel Structure with Dual Scanning Lines for 3D Cross Talk Reduction
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Solution Overview
Problem
Current 3D Shutter Glass technologies face significant cross talk issues, with existing solutions like BLU Scanning Mode and Black Insertion methods either being limited in effectiveness or requiring high refresh rates that can lead to insufficient charge and mura formation in liquid crystal display devices.
Innovation Solution
A pixel structure comprising a data line, orthogonal and parallel scanning lines, a pixel electrode, and a common electrode line, with switching units that allow independent operation of scanning signals to charge and hold power, enabling effective black image insertion without affecting refresh rates or charging time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If Black Insertion method is used to reduce cross talk, then cross talk is reduced, but refresh rate must be increased to 240 Hz which reduces charging time and causes insufficient charge and mura
Solution Approach 1:
The patent divides the scanning process into two separate scanning lines: first scanning line for data writing and second scanning line for common voltage writing. This segmentation allows independent operation of charging and black image insertion processes, enabling sufficient charging time while maintaining cross talk reduction effectiveness.
Solution Approach 2:
The patent implements dynamic control of the second scanning line by enabling it to transmit scanning signal only during specific periods (when first scanning line is not writing), and dynamically adjusting its operation based on the charging status of pixel electrodes. This dynamic approach allows flexible timing that ensures sufficient charging while achieving black image insertion.
2Object-affected harmful factors
If refresh rate is increased to 240 Hz for black image insertion, then cross talk is reduced, but charging time is reduced to half of 120 Hz causing insufficient charge
Solution Approach 1:
The patent segments the scanning function into two independent scanning lines, allowing the data writing process on the first scanning line to proceed at normal refresh rate without being interrupted by black image insertion operations, thereby preserving sufficient charging time.
Solution Approach 2:
The second scanning line acts as an intermediary that handles the black image insertion function separately from the main data writing process. By using this intermediary scanning line, the patent can insert black images during holding periods without interfering with the charging process on the first scanning line.
3Object-affected harmful factors
If second scanning line operates independently during holding power phase, then cross talk is reduced and resolution is improved, but device complexity increases
Solution Approach 1:
The second scanning line is designed with multi-functionality: it can transmit scanning signal to turn on second switching unit for common voltage writing, can be disabled to allow pixel electrode to maintain holding voltage, and can be dynamically controlled based on charging status. This universal design reduces the need for additional dedicated circuits.
Solution Approach 2:
The patent merges the black image insertion function with the existing scanning line structure by adding a second scanning line that shares the same physical infrastructure (scan lines, switching units) as the data writing process, rather than requiring separate dedicated circuits for black image insertion.
Data Source
AI summary
The present invention provides a liquid crystal display device, a pixel structure and a driving method. The first scanning line of the first scanning line transmits a scanning signal of the first switching unit, charging the pixel electrode, after the charge, when the pixel electrode is in the state of holding power, the second scanning line transmits the second scanning signal to turn on the second switching unit, the common electrode line provides the common voltage to the pixel electrode, in order to rise the pixel electrode voltage to the common voltage. Through the above ways, on one hand the present invention can ensure the charging time of the pixel electrode and the resolution of the liquid crystal display device, on the other hand inserting the black image, achieving the inserting black image technique, reducing the 3D cross talk.