PDLC Light-Shielding Strip for 3D Display Viewing Angle
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Solution Overview
Problem
Conventional passive polarized 3D display devices have limited viewing angles, resulting in poor image quality due to crosstalk between images in left and right eyes, and attempts to expand this angle often decrease the aperture ratio and brightness by adding light-shielding strips, which affects image quality.
Innovation Solution
A display panel with a light-shielding strip made of PDLC or electrochromic material is positioned on the color filter substrate opposite to the array substrate, which can switch between transparent and non-transparent states based on the user's visual angle, maintaining a high aperture ratio while increasing the viewing angle by applying voltage to the strip when the angle is within the desired range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a light-shielding strip is disposed on the color filter substrate to expand the viewing angle, then the viewing angle is increased, but the aperture ratio decreases resulting in decreased brightness
Solution Approach 1:
The patent applies a dynamic light-shielding strip made of PDLC or electrochromic material that can switch between transparent and non-transparent states. When the viewing angle is within the desired range, voltage is applied to make the strip transparent, maintaining high aperture ratio and brightness. When the viewing angle exceeds the range, the strip automatically transitions to non-transparent state to block crosstalk, thus dynamically adjusting to resolve the contradiction between viewing angle and brightness.
Solution Approach 2:
The patent changes the optical parameter (transparency) of the light-shielding strip by applying voltage, transforming it from a static light-blocking element to a controllable optical component. This parameter change allows the strip to be transparent when needed for high brightness and switch to opaque when needed for viewing angle control, resolving the trade-off between aperture ratio and viewing angle.
2Reliability
If a light-shielding strip is added to improve image quality by reducing crosstalk, then image quality improves, but the aperture ratio decreases
Solution Approach 1:
The dynamic switching capability of the PDLC or electrochromic light-shielding strip allows it to be transparent when the viewing angle is appropriate, maintaining high aperture ratio. When crosstalk occurs outside the desired viewing angle range, the strip switches to non-transparent state to eliminate crosstalk and improve image quality, thus resolving the contradiction between aperture ratio and image quality.
Solution Approach 2:
The patent utilizes the optical property change (from transparent to non-transparent) of PDLC or electrochromic materials when voltage is applied. This optical state change allows the light-shielding strip to be invisible when not needed, maximizing aperture ratio, and become effective when needed to block crosstalk, improving image quality without permanent aperture loss.
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 solution ensures a high aperture ratio and improved image quality by maintaining the light transmitting area unchanged while expanding the viewing angle, enhancing the brightness and quality of the displayed images.
Implementation Method 1
a light-shielding strip 7 made of PDLC or electrochromic material
Implementation Method 2
a light-shielding strip 7 made of PDLC or electrochromic material
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
A display panel, a fabrication method and a display device thereof are provided. The display panel comprises: an array substrate (3); a color filter substrate (4), cell-assembled with the array substrate (3) and including a black matrix (41); a plurality of light-shielding strips (7), disposed on a side of the color filter substrate (4) away from the array substrate (3); an electrode (10), sandwiching the plurality of light-shielding strips, wherein the black matrix includes a plurality of matrix strips (41), and each of the plurality of light-shielding strips (7) corresponds to one of the matrix strips (41) of the black matrix, and the light-shielding strip (7) is made of polymer dispersed liquid crystal material or electrochromic material. In this way, a high aperture ratio is ensured while a viewing angle of a display device is increased. Meanwhile, a brightness of the display device is increased, and an image quality is improved.