Dummy Metal Pattern for OLED Light Leakage Prevention
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Solution Overview
Problem
Light leakage in organic electroluminescent display devices due to residues at corner portions of the groove on the second substrate degrades display quality by causing brightness and color uniformity issues.
Innovation Solution
A dummy metal pattern is formed at the corner portions of the non-active area on the first substrate to overlap with the residues at the corner portions of the groove on the second substrate, preventing light leakage by shielding the reflected and refracted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a groove is formed in the second substrate to eliminate moisture, then moisture protection is improved, but residues remain at corner portions causing light leakage
Solution Approach 1:
A dummy metal pattern is introduced as an intermediary element between the groove structure and the light path. This dummy metal pattern, having the same material and reflectivity as the reflective electrode, serves as a mediator to block light leakage caused by groove residues without affecting the moisture protection function of the groove
Solution Approach 2:
The harmful effect of light leakage is extracted and addressed separately from the groove structure. By identifying that only the corner portions with residues cause light leakage, the solution extracts and treats only those specific areas with dummy metal patterns, leaving the rest of the groove structure intact for moisture protection
2Ease of manufacture
If residues remain at corner portions of the groove, then manufacturing simplicity is maintained, but display quality deteriorates due to light leakage
Solution Approach 1:
The dummy metal patterns are formed in advance during the manufacturing process, specifically after the groove is formed but before final assembly. This preliminary action ensures that when the device is assembled and light is emitted, the dummy metal patterns are already in position to block light leakage from groove residues, preventing display quality issues before they occur
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 dummy metal pattern effectively prevents light leakage, thereby improving the display quality by maintaining brightness and color uniformity in organic electroluminescent display devices.
Implementation Method 1
a dummy metal pattern is formed at corner portions of the non-active area on the first substrate to overlap a residue at a corner portion of the groove... preventing light leakage by shielding the reflected and refracted light
Implementation Method 2
a reflective electrode is formed in each pixel region on the first substrate... the reflective electrode is formed to correspond to the organic luminescent pattern
Implementation Method 3
an organic electroluminescent (EL) diode E is sequentially formed on the first substrate... an organic luminescent layer 13 includes red, green and blue organic luminescent patterns
Data Source
AI summary
An organic electroluminescent display device includes: a first substrate having an active area displaying images and a non-active area surrounding the active area; a switching thin film transistor and a driving thin film transistor connected to the switching thin film transistor in the active area on the first substrate; an organic electroluminescent diode connected to the driving thin film transistor; a dummy metal pattern at a corner portion of the non-active area on the first substrate; a second substrate facing and spaced apart from the first substrate, the second substrate including a groove; and a seal pattern attaching the first and second substrates, wherein the dummy metal pattern overlaps a residue at a corner portion of the groove.