Dual-Layer Display Target Border for Visibility
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Solution Overview
Problem
Existing display devices face challenges in maintaining visibility of the display target when illumination light from a source is transmitted, especially when external light hits, due to low contrast caused by similar illumination and ink colors in the light shielding layers.
Innovation Solution
A display device configuration featuring a panel with a reflective film and two display layers, where the first layer shields illumination light and the second layer is printed in a different color, with a border formed by the edge of the first layer enhancing visibility by creating a clear distinction through a color difference, even when illumination light is transmitted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single light shielding layer is used, then the structure is simple and manufacturing is easy, but the visibility of the display target deteriorates when illumination color is close to the ink color
Solution Approach 1:
The single light shielding layer is divided into two separate layers: a first light shielding layer and a second light shielding layer. The first layer provides the primary light shielding function, while the second layer forms a border portion at the edge of the display target. This segmentation allows each layer to have optimized color properties, ensuring visibility even when illumination color is close to the main display layer color.
Solution Approach 2:
Different regions of the display target are given different color properties. The central region (first display layer) uses one color for light shielding, while the edge region (border portion from second display layer) uses a different color. This local differentiation ensures that the border provides contrast and visibility regardless of the illumination color matching the main display area.
2Reliability
If the border portion is continuously provided over the entire edge, then the visibility improvement is maximized, but the manufacturing complexity and cost increase
Solution Approach 1:
Instead of providing the border portion continuously over the entire edge, the second light shielding layer is applied partially or selectively at specific edge regions where visibility enhancement is most needed. This partial action approach maintains the visibility improvement benefit while reducing the amount of material and processing complexity compared to a complete continuous border.
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 configuration improves visibility of the display target by creating a clear border effect, allowing easy distinction even when illumination light color is close to the second display layer color, and reduces costs by eliminating the need for laser peeling, while maintaining color difference visibility without illumination.
Implementation Method 1
a reflective film formed on a front surface of the transparent resin portion
Implementation Method 2
the first display layer is printed so as to shield the illumination light emitted from the light source
Data Source
AI summary
A display device includes a panel, a light source, and a display target. The panel has a transparent resin portion and a reflective film formed on a front surface of the transparent resin portion, the display target has a first display layer printed on a front surface of the reflective film and a second display layer printed on a front surface of the first display layer, the first display layer is printed so as to shield the illumination light emitted from the light source, the second display layer is printed in a color different from a color of the first display layer, an outer dimension of the second display layer is smaller than an outer dimension of the first display layer, and a border portion formed by an edge portion of the front surface of the first display layer is provided at an edge portion of the display target.