Staggered Sub-Pixel Grating for High PPI Display Manufacturing
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Solution Overview
Problem
Conventional 3D display devices with parallax barrier technology face challenges in achieving high precision and complexity in manufacturing due to the need for small electrode widths and precise control of electrodes, especially at high Pixels Per Inch (PPI), which complicates the process and increases costs.
Innovation Solution
A display device with a grating structure where the electrodes of the first substrate are arranged longitudinally and the second substrate transversely, with staggered sub-pixel columns and alternating signal levels to control the liquid crystal layer, allowing for increased electrode width and simplified manufacturing, enabling easier switching between 2D and 3D displays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high PPI is used to achieve high display resolution, then display resolution is improved, but electrode width becomes very small requiring high manufacturing precision
Solution Approach 1:
The pixel array is divided into odd-numbered columns and even-numbered columns with different staggered arrangements. The grating electrodes are segmented to correspond to specific column groups, allowing each electrode to cover a larger effective area while maintaining the high PPI display resolution. This segmentation enables the electrode width to be larger without compromising the perceived resolution.
Solution Approach 2:
The patent introduces a longitudinal staggering dimension to the sub-pixel column arrangement. Odd-numbered columns and even-numbered columns are staggered by a predetermined length in the longitudinal direction, creating a multi-dimensional arrangement that allows larger electrode widths while maintaining high display resolution through the staggered coverage pattern.
2Measurement precision
If electrode width is reduced for high PPI, then display resolution is improved, but manufacturing process becomes difficult
Solution Approach 1:
The grating electrodes are segmented into groups corresponding to odd-numbered and even-numbered column groups. Each segment can be manufactured with standard width tolerances, and the staggered arrangement ensures that the combined coverage achieves the desired high resolution effect without requiring sub-micron precision in individual electrode fabrication.
Solution Approach 2:
The patent changes the arrangement parameters of sub-pixel columns (staggering odd and even columns by a predetermined length) rather than changing the electrode width parameter. This allows the system to achieve high effective resolution through geometric arrangement rather than through precise dimensional control of electrode width, significantly easing manufacturing.
3Measurement precision
If electrodes are controlled row by row for precise grating formation, then grating control precision is improved, but control complexity increases
Solution Approach 1:
The patent merges the control of multiple electrode rows by grouping them according to their correspondence with odd-numbered and even-numbered column groups. This allows adjacent electrodes to be controlled together with the same voltage level, reducing the number of independent control signals needed while maintaining precise grating formation through the staggered column arrangement.
Solution Approach 2:
The grating electrode structure is designed to serve multiple functions: forming the parallax barrier grating, defining sub-pixel boundaries, and enabling staggered column arrangements. This multi-functionality reduces the need for separate control mechanisms, simplifying the overall control system while maintaining precise grating control.
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 reduces manufacturing precision requirements, simplifies the process, and lowers costs while improving display resolution and 3D effect by aligning sub-pixels in a staggered arrangement, allowing for efficient control of the grating to create light shielding and transmitting regions for stereoscopic viewing.
Implementation Method 1
The electrodes of the first substrate and the second substrate are configured to generate an electric field to control rotation of each liquid crystal molecule in the liquid crystal layer
Implementation Method 2
By controlling a voltage difference between electrodes of the first and the second substrates, liquid crystal molecules in the liquid crystal layer may rotate
Data Source
AI summary
The present disclosure provides a display device and a method for controlling a grating. The display device includes at least a pixel array and a grating. The pixel array comprises a plurality of columns of pixels. Each pixel includes at least one sub-pixel. Upper edges of odd-numbered columns of sub-pixels are aligned and upper edges of even-numbered columns of sub-pixels are aligned, and each of the odd-numbered columns of sub-pixels and each of the even-numbered columns of sub-pixels are staggered longitudinally. The grating comprises a liquid crystal layer and a first substrate. The electrodes of the first substrate are arranged to correspond to a region where a portion of the odd-numbered columns of, or the even-numbered columns of, sub-pixels of the pixel array is located. A corresponding region of the grating is turned on or turned off so as to form a light shielding region and a light transmitting region.