Light-Blocking Member Segmentation for Laser Repair in OLED Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light-emitting display devices with color-converting layers face issues as lasers used for detecting defective pixels can be scattered by wavelength-converting materials, damaging adjacent normal pixels.
Innovation Solution
The display device incorporates a light-blocking member and marking areas with distinct reflective characteristics, allowing lasers to be accurately targeted through a light-blocking area devoid of wavelength-converting particles, preventing damage to normal pixels during the repair process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a color-converting layer with wavelength-converting material is added to improve display quality, then color conversion capability is improved, but laser scattering occurs causing damage to normal pixels
Solution Approach 1:
The patent divides the light-blocking member into multiple segments: a first light-blocking member covering the light-blocking area, and a second light-blocking member covering the wavelength-converting material. This segmentation isolates the wavelength-converting material from the laser path, preventing scattering damage to normal pixels while preserving display quality.
Solution Approach 2:
The patent extracts the wavelength-converting material from the direct laser path by placing it under a dedicated light-blocking member. This allows the color-converting layer to remain functional for display quality while preventing it from causing laser scattering damage during repair operations.
2Ease of repair
If laser is irradiated to induce short of anode and cathode for converting defective pixel into dark spot, then defective pixel repair is achieved, but adjacent normal pixels may be damaged by scattered laser
Solution Approach 1:
The patent applies preliminary anti-action by placing light-blocking members over the wavelength-converting material before laser irradiation. This pre-established barrier prevents scattered laser from reaching normal pixels, allowing safe repair of defective pixels without compromising adjacent areas.
Solution Approach 2:
The light-blocking member acts as an intermediary between the laser and the wavelength-converting material. It allows the laser to reach the defective pixel for repair while blocking scattered laser from damaging normal pixels, thus mediating between repair effectiveness and pixel protection.
3Object-affected harmful factors
If light-blocking member is added to prevent laser scattering damage, then normal pixel protection is improved, but device structure complexity increases
Solution Approach 1:
The patent merges the light-blocking function with existing structural elements by integrating the light-blocking member into the display device's existing architecture. This combining approach provides laser protection while minimizing additional structural complexity.
Solution Approach 2:
The light-blocking member serves multiple functions: it blocks scattered laser during repair operations, maintains display quality by managing light paths, and integrates with the existing color-converting layer structure. This multi-functionality reduces the need for separate protective components.
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 solution enhances the reliability and efficiency of the repair process by accurately isolating defective pixels and preventing laser-induced damage to surrounding pixels, improving the overall reliability and repair efficiency of the display device.
Implementation Method 1
The color-converting layer may include a wavelength-converting material, such as a quantum dot
Implementation Method 2
The laser may be irradiated onto the defective pixel to induce a short of an anode and cathode
Implementation Method 3
a laser may be scattered by a wavelength-converting material or a scattering particle in the color-converting layer
Implementation Method 4
The marking area overlaps a corresponding pixel electrode and has a reflective characteristic to an external light that is different from a reflective characteristic of a remaining portion of the light-blocking area to the external light
Data Source
AI summary
A display device having a first substrate including lower electrodes, an upper electrode and a light-emitting layer disposed between the lower electrodes and the upper electrode. A second substrate is combined with the first substrate and defines light-emitting areas. The second substrate includes a color filter layer overlapping the light-emitting areas. A light-blocking member overlaps a light-blocking area surrounding the light-emitting areas. The light-blocking member includes openings overlapping the lower electrodes.