Shutter Panel Electrode Capacitance Timing Synchronization
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Solution Overview
Problem
The existing stereoscopic display devices experience a delay in switching the polarization direction of light due to increased time constants caused by wiring line resistance and common transition material resistance, which desynchronizes the shutter panel's operation with the display panel's timing.
Innovation Solution
Incorporating a third electrode connected to a fixed potential and an insulating layer between the second electrode and the third electrode, forming an additional electric capacitance that reduces the potential change in the second electrode when the voltage is switched, thus synchronizing the polarization direction change with the display timing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second electrode is connected to fixed potential via wiring line and common transition material, then the electrode can be electrically connected, but wiring line resistance and common transition material resistance are generated causing potential change and increased time constant
Solution Approach 1:
The patent divides the single common electrode connection into two separate connections: the second electrode connected to fixed potential and the third electrode connected to ground potential. This segmentation eliminates the common transition material and its associated resistance, resolving the contradiction by providing reliable electrical connection without the time delay caused by resistance in a shared path.
Solution Approach 2:
The insulating layer serves as an intermediary between the second electrode and third electrode, allowing them to be positioned close together to form parasitic capacitance while maintaining electrical isolation. This intermediary structure enables the two electrodes to work cooperatively to reduce the time constant without direct electrical connection that would create resistance.
2Ease of operation
If drive voltage is supplied to first electrode, then polarization direction can be switched, but potential of second electrode changes due to wiring line resistance and electric capacitance of liquid crystal layer
Solution Approach 1:
The third electrode connected to ground potential acts as a counterweight to stabilize the potential of the second electrode. When voltage is applied to the first electrode, the parasitic capacitance between the second and third electrodes provides a counteracting effect that prevents significant potential drift in the second electrode, maintaining potential stability while allowing voltage control of the liquid crystal layer.
3Loss of time
If additional electrode and insulating layer are added, then potential change in second electrode is reduced and timing is synchronized, but device complexity increases
Solution Approach 1:
The third electrode serves multiple functions: it provides a ground reference, forms parasitic capacitance with the second electrode to reduce its potential drift, and acts as a shield. This multi-functionality justifies the additional component by achieving timing synchronization without proportionally increasing complexity, as one element performs several critical roles.
Solution Approach 2:
The third electrode connected to ground potential creates an equipotential reference that stabilizes the electrical environment for the second electrode. By providing a fixed potential reference close to the second electrode through the insulating layer, the structure achieves timing synchronization while the simplicity of using a standard ground connection minimizes the added complexity.
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
This configuration reduces the delay in switching the polarization direction of light, ensuring that the shutter panel's timing is synchronized with the display panel's timing, preventing delays in image switching.
Implementation Method 1
forming an additional electric capacitance that reduces the potential change in the second electrode when the voltage is switched
Implementation Method 2
a liquid crystal layer arranged between the first electrode and the second electrode, a drive circuit configured to apply, to the first electrode, any one of a first voltage changing a polarization direction of emission light into a first polarization direction
Data Source
AI summary
A stereoscopic display device includes a display panel and a shutter panel. The shutter panel includes a liquid crystal layer, segment electrodes, a counter electrode and an auxiliary electrode that are connected to the ground, an insulating layer, and a shutter panel drive circuit. The shutter panel drive circuit switches a voltage applied to the segment electrodes between a first drive voltage and a ground voltage in synchronization with a switching of a display of the display panel. The auxiliary electrode is arranged on a side opposite to the liquid crystal layer with respect to the counter electrode. The insulating layer is arranged between the counter electrode and the auxiliary electrode.