Flexible OLED Display Structure for Thin, High-Contrast Panels
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Solution Overview
Problem
Conventional display apparatuses are thick and heavy due to the inclusion of components such as liquid crystals, backlight units, and polarizing filters, which are necessary for color image display.
Innovation Solution
A flexible display apparatus utilizing a substrate with spaced light emitting devices and a light shielding layer, eliminating the need for liquid crystals, backlight units, and polarizing filters, and incorporating a mesh structure common circuit for electrical coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If liquid crystals, backlight units, and polarizing filters are used in a display apparatus, then color image display is achieved, but the display apparatus becomes thick and heavy
Solution Approach 1:
The patent extracts and eliminates the backlight unit, liquid crystals, and polarizing filters from the display apparatus. Instead, it uses self-emissive OLED pixels that generate their own light, removing the need for these heavy components while maintaining color display capability through the organic light-emitting materials and color filters.
Solution Approach 2:
The patent replaces the mechanical/optical system of liquid crystals and polarizing filters with an electrochemical system using organic light-emitting diodes. The OLED structure uses electrically excited organic compounds to emit light directly, substituting the complex mechanical optical path control with a simpler electrical excitation mechanism.
2Illumination intensity
If liquid crystals, backlight units, and polarizing filters are used in a display apparatus, then color image display is achieved, but the display apparatus becomes thick
Solution Approach 1:
The patent extracts and eliminates the backlight unit, liquid crystals, and polarizing filters from the display apparatus. Instead, it uses self-emissive OLED pixels that generate their own light, removing the need for these thick components while maintaining color display capability through the organic light-emitting materials and color filters.
3Illumination intensity
If light emitting devices are spaced apart with uniform distance, then uniform light extraction is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses a flexible substrate that allows the light emitting devices to be spaced apart with uniform distance while maintaining manufacturing feasibility. The flexibility enables accommodation of slight manufacturing variations and allows for post-fabrication adjustments to achieve uniform spacing without requiring extremely high precision manufacturing.
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 results in a thinner and lighter display apparatus capable of uniform light generation and increased contrast, with improved flexibility and durability.
Implementation Method 1
A display apparatus including a plurality of light emitting diodes constructed according to exemplary embodiments of the invention are capable of obviating the need of at least one or more components of a conventional display apparatus
Implementation Method 2
Each of the light emitting devices may include a first light emitting part, a second light emitting part, and a third light emitting part horizontally spaced apart from one another on the substrate
Implementation Method 3
a light shielding layer disposed between the light emitting devices, and partially covering the light emitting devices to define light extraction surfaces
Implementation Method 4
The display apparatus may further include a protection layer covering the light emitting devices on the substrate, the protection layer including a material that transmits visible light
Data Source
AI summary
A light emitting device including a protection layer including a first area and a second area having a greater thickness than the first area, a light emitting stacked structure including a plurality of semiconductor layers sequentially disposed one over another along a first direction on the first area of the protection layer, a plurality of via patterns electrically connected to the light emitting stacked structure and having a length along the first direction, and a plurality of pads electrically connected to the light emitting stacked structure through the via patterns, respectively, in which the second area of the protection layer does not overlap the light emitting stacked structure, and at least portion of the pads overlaps the second area of the protection layer and one of the via patterns.