Subpixel Bump Joint Layout to Reduce Display Light Leakage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display devices with semiconductor light-emitting elements suffer from scattered light leakage due to the bump joint configuration, where light from one subpixel is scattered and directed towards adjacent subpixels, leading to reduced display quality.
Innovation Solution
The display device design shifts the center of the bump joint's element joining region relative to the light-emitting region's center, positioning the joint such that scattered light is redirected back to the light-emitting layer, thereby minimizing its entry into adjacent subpixels, and uses a bump joint with a curved side surface to effectively manage light propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the bump joint is disposed immediately below the semiconductor light-emitting element, then the electrical connection is simplified and manufacturing is easier, but scattered light is generated and leaks toward adjacent subpixels
Solution Approach 1:
The bump joint is positioned asymmetrically relative to the light-emitting element, specifically shifted toward the blue subpixel side rather than being centered. This asymmetric positioning causes scattered light to be directed toward the blue subpixel where it is less problematic, rather than symmetrically distributing scattered light to all adjacent subpixels. The joint position is set at a specific offset distance from the center of the light-emitting element to optimize this light redirection effect.
Solution Approach 2:
The invention applies different positioning strategies for different types of subpixels. The joint position is specifically optimized for blue subpixels, which have shorter wavelengths and different light scattering characteristics. By tailoring the joint position to the specific optical properties of blue subpixels, the solution addresses the scattered light problem locally for the most problematic color channel while maintaining overall display performance.
2Manufacturing precision
If the bump joint center is aligned with the light-emitting region center, then the electrical connection is more stable and manufacturing precision is easier to achieve, but light utilization efficiency decreases due to scattered light leakage
Solution Approach 1:
The bump joint is positioned asymmetrically relative to the light-emitting element, specifically shifted toward the blue subpixel side rather than being centered. This asymmetric positioning causes scattered light to be directed toward the blue subpixel where it is less problematic, rather than symmetrically distributing scattered light to all adjacent subpixels. The joint position is set at a specific offset distance from the center of the light-emitting element to optimize this light redirection effect.
Solution Approach 2:
Instead of trying to prevent scattered light generation entirely, the invention redirects the scattered light toward a specific subpixel (blue) where it causes less visual interference. The scattered light that would otherwise be harmful is converted into a less problematic condition by strategic positioning, effectively transforming the harm into a beneficial or at least acceptable outcome.
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 significantly reduces scattered light entering adjacent subpixels, enhancing light utilization efficiency and achieving improved luminance and display quality.
Implementation Method 1
scattered light is generated when light leaking downward from the semiconductor light-emitting element present in one subpixel is scattered at the bump joint
Data Source
AI summary
To provide a display device that can suppress scattered light generated when light leaking downward from a semiconductor light-emitting element of one subpixel is scattered at a joint, from leaking to an adjacent subpixel. The display device includes a display panel including a plurality of semiconductor light-emitting elements each including a light-emitting layer, a drive substrate having a drive circuit and facing the display panel, and a plurality of joints each electrically connecting each of a plurality of the semiconductor light-emitting elements to the drive substrate, in which, in a case where a direction in which the display panel and the drive substrate face each other is a line-of-sight direction, a position of a center of a light-emitting region of the semiconductor light-emitting element and a position of a center of the joint to be joined to the semiconductor light-emitting element are shifted from each other.