See-through Display Light Shielding Layer for Contrast and Cost
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Solution Overview
Problem
See-through display devices face increased manufacturing costs due to the need for both a light shielding layer on the upper substrate for light absorption and a light shielding strip on the lower substrate to prevent light leakage, especially in dark states, which reduces contrast and aperture ratio.
Innovation Solution
A see-through display device with a light guide plate and array substrate, featuring a liquid crystal dimming layer, extinction layer with alternating light guide and absorption regions, and a reflecting layer with inclined surfaces to control light reflection and absorption, preventing light leakage in dark states without additional light shielding on the lower substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light shielding strip is added on the lower substrate to prevent light leakage, then the contrast is improved, but the manufacturing cost increases
Solution Approach 1:
The patent extracts the light blocking function from the lower substrate and relocates it to the upper substrate's light shielding layer. By using the upper substrate's light shielding layer to perform both light absorption and light leakage prevention functions, the need for an additional light shielding strip on the lower substrate is eliminated, thus reducing manufacturing cost while maintaining contrast performance
Solution Approach 2:
The upper substrate's light shielding layer is designed to serve multiple functions: it absorbs light in the display area and simultaneously prevents light leakage in the non-display area. This multi-functional design eliminates the need for separate light shielding components on the lower substrate, reducing overall device complexity and manufacturing cost while maintaining high contrast ratio
2Object-affected harmful factors
If a light shielding layer and light shielding strip are both used, then light leakage is prevented, but the aperture ratio decreases
Solution Approach 1:
The patent extracts the light leakage prevention function from the lower substrate and consolidates it into the upper substrate's light shielding layer. This eliminates the need for additional light shielding structures on the lower substrate, thereby maximizing the aperture ratio while still preventing light leakage through the non-display area
Solution Approach 2:
The patent merges the light absorption function and light leakage prevention function into a single integrated light shielding layer on the upper substrate. This unified structure covers both the display and non-display areas, preventing light leakage without requiring separate shielding components that would reduce the aperture ratio
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 contrast and reduces manufacturing costs by ensuring light is absorbed and reflected appropriately, eliminating the need for a light shielding strip on the lower substrate, thereby increasing the aperture ratio.
Implementation Method 1
a light ray incident into the light guide plate is transmitted in a total reflection manner
Implementation Method 2
the light ray exiting from the light extraction outlets is deflected by the liquid crystal layer and is incident to the reflecting layer
Implementation Method 3
configured to reflect the collimated light extracted from the light extraction outlets to the light guide plate
Implementation Method 4
extract, in a collimated manner, the light ray transmitted inside the light guide plate through the light extraction outlets
Implementation Method 5
is transmitted to the light absorption region in a total reflection manner within the light guide region
Data Source
AI summary
This disclosure relates to a see-through display device, including: a collimated light source assembly, configured to form collimated light and control a light emitting direction; a first light extraction layer, configured to extract, in a collimated manner, the light ray transmitted inside the light guide plate through a light extraction outlet; an extinction layer and a second light extraction layer, wherein the extinction layer includes a light guide region and a light absorption region which are arranged alternately, and the second light extraction layer includes multiple light extraction inlets; a reflecting layer, arranged on a side, close to the light guide plate, of the second light extraction layer and configured to reflect the collimated light extracted from the light extraction outlet to the light guide plate; and a liquid crystal dimming layer. This disclosure further relates to a manufacturing method of the see-through display device.