Narrow Frame Display Device with Vertical Wiring Board
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Solution Overview
Problem
Conventional display devices with polymer dispersed liquid crystal layers face challenges in minimizing the frame area outside the display area, limiting their ability to narrow the frame and enhance user experience by allowing background visibility.
Innovation Solution
The configuration of a display device with a display panel, cover members, and a specific arrangement of components such as flexible wiring boards and light emitting modules, where the second cover member's side surface is positioned closer to the display area, allowing the wiring board to be placed closer to the display area, thereby reducing the frame size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the frame portion is reduced to narrow the frame, then the display area occupies more space and user experience improves, but the wiring board and other components become harder to arrange and secure bonding becomes difficult
Solution Approach 1:
The patent positions the wiring board in the third dimension (thickness direction) by having it extend from the rear surface of the display panel toward the front, allowing it to pass through or near the display area without increasing the planar frame area. This vertical arrangement enables compact integration of electrical components while maintaining a narrow front frame.
Solution Approach 2:
The wiring board is nested within the structural depth of the display device, with the first wiring board extending through the display panel thickness and the second wiring board arranged in the gap between cover members. This nesting allows multiple components to share the same spatial envelope without increasing the visible frame dimensions.
2Area of stationary object
If the second cover member's side surface is positioned closer to the display area, then the frame becomes narrower, but the space for arranging the wiring board and ensuring secure bonding is reduced
Solution Approach 1:
The bonding structure extends in the thickness direction rather than relying solely on planar bonding area. The adhesive layer bonds the wiring board to the cover member along its extended surface, providing secure attachment even when the cover member's side surface is positioned close to the display area.
Solution Approach 2:
The wiring board is designed to extend from the display panel rear surface before final assembly, allowing it to be pre-positioned and bonded to the cover member. This preliminary arrangement ensures secure bonding is achieved during assembly even with minimal frame space.
3Shape
If the frame is narrowed to allow background visibility, then aesthetic appearance and user experience improve, but the structural support and component mounting space are reduced
Solution Approach 1:
The display panel and cover members provide structural support in the thickness direction, compensating for the reduced frame width in the planar direction. The wiring board's vertical extension through the panel depth creates structural rigidity that replaces the traditional wide frame's support function.
Solution Approach 2:
The display panel combines multiple materials (substrate, liquid crystal layer, cover members, adhesive layers) to create a composite structure that provides adequate structural support with minimal frame width. The layered composite construction distributes mechanical stresses throughout the thickness direction.
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 enables a narrower frame, allowing images to be displayed while enabling background visibility and improving the overall user experience by minimizing the frame area, while also ensuring secure bonding and efficient light management.
Implementation Method 1
The polymer dispersed liquid crystal layer can switch a scattering state in which light is scattered and a transmitted state in which light is transmitted
Data Source
AI summary
According to one embodiment, a display device includes a display panel having a first surface, a second surface on a side opposite to the first surface, and a display area including pixels, a first cover member overlapping the display area and opposed to the first surface, and a second cover member overlapping the display area and opposed to the second surface. The first cover member has a first side surface close to a first end portion of the display panel, the second cover member has a second side surface close to the first end portion, and the first side surface is located between the first end portion and the second side surface in planar view.