Anti-Peeping Display Reflective Layer for Side-View Privacy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing anti-peeping display products using collimated backlight systems still have a risk of information leakage due to gradual brightness reduction from front to side viewing angles, allowing confidential information to be identified at side viewing angles.
Innovation Solution
An anti-peeping display device incorporating a collimated backlight module and a liquid crystal display panel with a reflective layer on the opposite substrate, where the reflective layer overlaps with non-light-transmitting regions, reflecting ambient light to equalize brightness at front and side viewing angles, and optionally using a liquid crystal polymer structure to switch between anti-peeping and shared states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a collimated backlight system is used to reduce side-viewing brightness, then anti-peeping effect is improved, but brightness uniformity across viewing angles deteriorates
Solution Approach 1:
The patent applies local quality by implementing a reflective layer with specific optical properties at the bottom substrate that selectively reflects ambient light. This local modification creates different optical characteristics in different regions of the display system, enhancing anti-peeping effect in side viewing directions while preserving normal display quality in front viewing direction.
Solution Approach 2:
The patent inverts the conventional approach by using a reflective layer to bounce ambient light back through the display stack. Instead of simply blocking or absorbing light, the reflective layer redirects ambient light paths, creating anti-peeping effect through optical inversion that equalizes brightness perception across different viewing angles.
2Object-affected harmful factors
If a reflective layer is added to equalize brightness at front and side viewing angles, then anti-peeping effect is improved, but device complexity increases
Solution Approach 1:
The patent merges the reflective layer function with the existing bottom substrate structure. By integrating the reflective properties into the bottom substrate layer rather than adding a completely separate component, the design reduces overall device complexity while achieving the desired anti-peeping effect through combined structural and optical functionality.
Solution Approach 2:
The reflective layer utilizes ambient light that would otherwise be wasted, converting it into a useful resource for enhancing anti-peeping effect. This self-service approach uses existing environmental light rather than requiring additional active lighting components, thereby reducing device complexity while improving security performance.
3Illumination intensity
If the reflective layer overlaps with non-light-transmitting regions, then brightness equalization is improved, but light transmission efficiency deteriorates
Solution Approach 1:
The reflective layer is strategically positioned to overlap specifically with non-light-transmitting regions (black matrix areas) rather than uniformly across the entire display. This localized placement ensures that light transmission efficiency in pixel regions is preserved while achieving brightness equalization in non-display areas, resolving the contradiction between these two requirements.
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
Enhances anti-peeping effect by ensuring lower effective brightness at side viewing angles without affecting normal display, allowing users to choose between anti-peeping and shared states based on need.
Implementation Method 1
a reflective layer on the base substrate, an orthographic projection of the reflective layer on the base substrate overlaps with an orthographic projection of at least part of the non-light-transmitting region on the base substrate, and the reflective layer is configured to reflect ambient light
Implementation Method 2
the liquid crystal polymer structure is configured to control a refractive index of the liquid crystal polymer layer by applying an electric field between the first electrode layer and the second electrode layer, so that the liquid crystal polymer layer switches between a transparent state and an opaque state
Data Source
AI summary
An anti-peeping display device, including a collimated backlight module and a liquid crystal display panel that are stacked. The liquid crystal display panel is located on a light exit side of the collimated backlight module. The liquid crystal display panel includes an array substrate and an opposite substrate that are disposed opposite to each other. The array substrate is close to the collimated backlight module, and the opposite substrate is away from the collimated backlight module. The opposite substrate includes: a base substrate, the base substrate having a plurality of light-transmissive regions and non-light-transmissive regions located between adjacent light-transmissive regions; and a reflective layer located on the base substrate, the orthographic projection of the reflective layer on the base substrate overlapping the orthographic projections of at least parts of the non-light-transmissive regions on the base substrate, and the reflective layer being configured to reflect ambient light.