Display Barrier with Transmissive Blocking Zones for Viewing Angle Control
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Solution Overview
Problem
Conventional LCD devices with twisted nematic liquid crystal cells have limited viewing angle modes and fail to provide sufficient privacy, as they cannot block images from the sides even in narrow viewing angles.
Innovation Solution
An image display device with a display panel and a barrier featuring alternately arranged transmissive and blocking portions, which creates different viewing zones to control image visibility based on the viewing angle, allowing for convertibility between wide and narrow viewing modes and enhanced lateral image blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a TN liquid crystal cell is used to achieve a wide viewing angle, then the viewing angle is improved to some extent, but the luminance depends on viewing positions and the viewing angle is still narrow
Solution Approach 1:
The viewing angle control is segmented into multiple zones using a barrier structure with transmissive and blocking portions. The barrier divides the display into different viewing zones, allowing different luminance characteristics in different angular regions, thus resolving the contradiction between wide viewing angle and stable luminance.
Solution Approach 2:
Different regions of the display are given different optical properties through the barrier structure. The transmissive portions allow light passage for wide viewing, while blocking portions restrict light for privacy, creating local quality variations that satisfy both wide viewing angle and controlled luminance distribution.
2Adaptability or versatility
If uniaxial retardation films are added to compensate viewing angle, then the viewing angle is improved, but the device complexity increases
Solution Approach 1:
The patent extracts the viewing angle control function from the liquid crystal cell structure and relocates it to a separate barrier component. This separation allows the liquid crystal cell to focus on image generation while the barrier handles viewing angle control, reducing overall device complexity.
Solution Approach 2:
The barrier acts as an intermediary component between the liquid crystal cell and the viewer. It mediates the light output from the cell, controlling viewing angles without requiring modifications to the cell structure itself, thus avoiding increased device complexity.
3Adaptability or versatility
If an auxiliary parallel alignment cell is added to achieve mode convertibility, then convertibility between wide and narrow viewing modes is achieved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The barrier structure is made dynamic by enabling selective activation of transmissive and blocking portions through independent electrode control. This allows the same physical structure to switch between wide viewing mode (transmissive portions active) and narrow viewing mode (blocking portions active), achieving mode convertibility without adding separate cells.
Solution Approach 2:
The barrier structure serves multiple functions: it acts as both a viewing angle control element and a privacy control element. The same structure provides wide viewing angle when transmissive portions are activated and narrow viewing angle/privacy when blocking portions are activated, eliminating the need for separate auxiliary cells.
4Object-affected harmful factors
If blocking portions are added to enhance lateral image blocking, then user privacy is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The barrier is segmented into discrete transmissive and blocking portions that can be independently controlled. This segmentation allows for standardized manufacturing of each portion type, reducing overall manufacturing precision requirements while maintaining effective privacy protection through the collective arrangement of multiple segments.
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
The solution enables effective convertibility between wide and narrow viewing angle modes, improving user privacy by blocking images from the sides in narrow viewing angles without deteriorating luminance or resolution.
Implementation Method 1
The LCD device uses optical anisotropy and polarization properties of liquid crystal molecules to display images
Implementation Method 2
Light vibrating a predetermined direction can only pass the polarizer such that the polarizer produces a polarized light
Implementation Method 3
when the polarized light is obliquely incident into the two uniaxial retardation films 13, there is a change in polarizing state due to the two uniaxial retardation films 13
Data Source
AI summary
An image display device includes a display panel, and a barrier including a plurality of transmissive portions and a plurality of blocking portions on the display panel, wherein the plurality of transmissive portions and the plurality of blocking portions are arranged in a matrix, wherein 3Nth rows and (3N−1)th rows include the plurality of transmissive portions and the plurality of blocking portions, N being a positive integer, (3N−2)th rows include the plurality of transmissive portions excluding the plurality of blocking portions, , and the transmissive and blocking portions are alternately arranged.