Depressed Insulating Layer for Leakage Current in Display Apparatus
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Solution Overview
Problem
Conventional display apparatuses face challenges in achieving high resolution, high aperture ratio, reliability, and low power consumption, particularly due to leakage currents and the difficulty in reducing the distance between light-emitting devices without compromising display quality.
Innovation Solution
The display apparatus incorporates a structure with a first and second light-emitting device, each having a pixel electrode and an EL layer, with a depressed insulating layer creating a self-aligned EL film division, and coloring layers that transmit different wavelengths, allowing for full-color display and reduced leakage current by increasing the step formed by the pixel electrode and depressed portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between light-emitting devices is reduced to achieve higher resolution, then display resolution is improved, but leakage current increases and display quality deteriorates
Solution Approach 1:
The patent divides the insulating layer into multiple regions with different depths (first depressed portion, second depressed portion, third depressed portion) positioned at different locations between adjacent light-emitting devices. This segmentation allows each region to independently manage leakage current in different spatial zones, enabling closer spacing of light-emitting devices while maintaining display quality by preventing leakage current interference.
2Reliability
If the aperture ratio is increased to improve display quality, then light emission area is increased, but the distance between light-emitting devices decreases causing leakage current
Solution Approach 1:
The patent applies local quality by creating depressed portions with different depths at different locations between adjacent light-emitting devices. The first depressed portion has a different depth than the second and third depressed portions, allowing each region to be optimized for its specific function in preventing leakage current while maintaining high aperture ratio for improved display quality.
3Ease of manufacture
If a planar insulating layer structure is used, then manufacturing is simpler, but leakage current cannot be effectively inhibited
Solution Approach 1:
The patent transitions from a two-dimensional planar insulating layer to a three-dimensional structure with varying depths by forming multiple depressed portions at different depth levels. This dimensional change creates vertical differentiation in the insulating layer, enabling effective leakage current inhibition through strategic positioning of emissive and non-emissive regions while maintaining manufacturing feasibility.
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 high-resolution display with a high aperture ratio, improved reliability, and reduced power consumption by inhibiting leakage current and allowing for closer spacing of light-emitting devices, thereby enhancing luminance, contrast, and display quality.
Implementation Method 1
By voltage application to this element, light emission can be obtained from the light-emitting organic compound
Implementation Method 2
The first coloring layer and the second coloring layer transmit light of different wavelength ranges
Data Source
AI summary
A display apparatus with high display quality is provided. The display apparatus includes a first light-emitting device, a second light-emitting device, a first coloring layer, a second coloring layer, and a first insulating layer. The first light-emitting device includes a first pixel electrode over the first insulating layer, a first EL layer over the first pixel electrode, and a common electrode over the first EL layer. The second light-emitting device includes a second pixel electrode over the first insulating layer, a second EL layer over the second pixel electrode, and the common electrode over the second EL layer. The first coloring layer is provided to overlap with the first light-emitting device. The second coloring layer is provided to overlap with the second light-emitting device. The first coloring layer and the second coloring layer transmit light of different wavelength ranges. The first insulating layer includes a depressed portion between the first pixel electrode and the second pixel electrode. A third EL layer is provided in the depressed portion of the first insulating layer. The first EL layer, the second EL layer, and the third EL layer contain the same material. The sum of the thickness of the first pixel electrode and the depth of the depressed portion is larger than the thickness of the third EL layer.