Display Device Voltage Switching for Light-Shielding Control
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Solution Overview
Problem
Existing display devices with image separation units face issues where the display area becomes darker when light-shielding barriers are moved due to slow response speed of liquid crystal shutters, and voltage control becomes complicated.
Innovation Solution
A display device with a pair of substrates having two types of electrode groups, a liquid crystal layer, and a detection unit that applies specific voltages to electrodes based on viewer position, allowing for controlled light-shielding sections without darkening the display area and simplifying voltage control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If liquid crystal shutters are used to move the light-shielding barrier, then the position of the light-shielding barrier can be adjusted according to viewer's head position, but the display area becomes totally darker when the light-shielding barrier is moved due to slow response speed of the liquid crystal
Solution Approach 1:
The patent applies preliminary action by switching the liquid crystal shutter to the OFF state in advance before moving the light-shielding barrier to a new position. This ensures that the liquid crystal response is completed before the barrier movement begins, preventing display darkening during the transition. The control unit coordinates the timing so that the light-shielding barrier position change does not coincide with the liquid crystal response period.
2Reliability
If voltages are applied to multiple division barrier electrodes to form the parallax barrier, then the image separation function is achieved, but the control of voltages applied to the division barrier electrodes becomes complicated
Solution Approach 1:
The patent segments the electrode control into two independent groups: division barrier electrodes for image separation and light-shielding barrier electrodes for positional adjustment. By separating the control functions, the patent simplifies the voltage control system while maintaining reliable image separation. Each electrode group can be controlled independently according to its specific function, reducing overall control 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
Prevents the display area from becoming darker during light-shielding section movement while simplifying voltage control, ensuring a stable and effective stereoscopic image display.
Implementation Method 1
a liquid crystal layer sealed between the pair of substrates; a control unit that applies the specific voltage to one electrode groups that is selected from the electrode groups according to the viewer's eye position detected by the detection unit, so as to cause orientations of liquid crystal molecules in the liquid crystal layer to change
Data Source
AI summary
Provided is a display device characterized in that a display area can be prevented from appearing darker when the position of light-shielding sections are moved, while the control of voltages applied to electrodes is simplified. In the case where electrodes to which a specific voltage is applied are changed from a first electrode group (e.g., 52a) to a second electrode group (e.g., 52b, 58a, 58b), the voltage applied to the first electrode group is switched from the specific voltage to a reference voltage first, and thereafter, the voltage applied to the second electrode group is switched from the reference voltage to the specific voltage.