Bendable Display Backlight Light Guiding Plate Curvature
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Solution Overview
Problem
Conventional display devices with backlight units struggle to provide stable light distribution and efficient heat dissipation for bendable display panels, leading to limitations in shape flexibility and optical efficiency.
Innovation Solution
A bendable display device design featuring a light guiding plate with a curved exit surface, a circuit board with a reflective layer, and LED packages mounted on a conductive substrate, where the circuit board is cut into sections to form light emission units that can be arranged along the bending axis, allowing for efficient light distribution and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional backlight unit is used with a bendable display panel, then the display panel can achieve curved shapes, but stable light distribution and efficient heat dissipation cannot be maintained
Solution Approach 1:
The circuit board is divided into multiple separate circuit blocks rather than using a single continuous board. Each circuit block can be independently positioned and configured to match the curved geometry of the display panel, enabling stable light distribution across bent surfaces while maintaining electrical connectivity through conductive adhesive layers between blocks
Solution Approach 2:
Different regions of the backlight unit are designed with locally optimized properties - the light guiding plate has varying thickness and refractive index profiles in different zones to compensate for curvature effects, and LED packages are selectively positioned and oriented to maintain uniform light output across the curved display surface despite variations in local geometry
2Adaptability or versatility
If a conventional backlight unit is used with a bendable display panel, then the display panel can achieve curved shapes, but efficient heat dissipation cannot be maintained
Solution Approach 1:
The circuit board is divided into multiple separate circuit blocks rather than using a single continuous board. Each circuit block can be independently positioned and configured to match the curved geometry of the display panel, enabling stable light distribution across bent surfaces while maintaining electrical connectivity through conductive adhesive layers between blocks
Solution Approach 2:
Different regions of the backlight unit are designed with locally optimized properties - the light guiding plate has varying thickness and refractive index profiles in different zones to compensate for curvature effects, and LED packages are selectively positioned and oriented to maintain uniform light output across the curved display surface despite variations in local geometry
3Reliability
If the circuit board is cut into sections to form light emission units, then optical efficiency and lifetime are improved, but device complexity increases
Solution Approach 1:
Multiple functions are integrated into the light guiding plate including light distribution, heat dissipation pathways, and structural support for the curved geometry. The conductive adhesive layers serving as both electrical connectors and mechanical bonding elements between circuit blocks, reducing the need for separate components
Solution Approach 2:
The circuit blocks serve multiple purposes: electrical connection to LED packages, structural support for maintaining curved shape, heat conduction pathways, and positioning elements for aligning light emission units. This multi-functionality reduces overall device complexity despite the segmented structure
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 increased optical efficiency and extended lifetime of the display device by providing uniform light to the bendable display panel while efficiently dissipating heat generated by the LED packages, allowing for flexible shape accommodation without restrictions.
Implementation Method 1
The light guiding plate may receive light through an incident surface and provide the received light to the display panel through an exit surface
Implementation Method 2
A light guiding plate, which is bent along the bending axis, is accommodated into the internal space to dispose the light guiding plate on the light source
Implementation Method 3
The plurality of light emission units emits light to the incident surface. Each of the light emission units may include at least one LED package
Implementation Method 4
The conductive substrate may include at least one of aluminum or aluminum oxide. The solution enables increased optical efficiency and extended lifetime of the display device by providing uniform light to the bendable display panel while efficiently dissipating heat generated by the LED packages
Data Source
AI summary
Disclosed is display device that includes a display panel including a display surface shaped in a curve. The display surface is defined at an upper side of the display panel. A backlight unit is disposed at a lower side of the display panel. The backlight unit includes a light guiding plate bent along the bending axis. The light guiding plate includes an exit surface parallel with the display surface. The backlight units include a back surface facing the exit surface, and a plurality of connection sides connecting the exit surface with the back surface. At least one of the connection sides defines an incident surface. A circuit board is bent along the bending axis. A plurality of light emission units are electrically connected to the circuit board. The plurality of light emission units emits light to the incident surface. The bending axis is parallel to the incident surface.