Reflective Electrode Pattern for Higher-Luminance Displays
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Solution Overview
Problem
Existing display devices suffer from reduced light emission efficiency due to light emitted downward from light emitting elements being blocked or absorbed by peripheral components.
Innovation Solution
Incorporation of an electrode pattern at the same layer as the first and second electrodes, overlapping the light emitting elements in the thickness direction, which is spaced and insulated from them, and made of reflective materials to reflect light towards the front side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting elements emit light in all directions, then light emission coverage is improved, but light loss due to downward emission being blocked is worsened
Solution Approach 1:
The patent applies this principle by converting the harmful effect of downward-emitted light (which would be blocked and lost) into a beneficial effect. An electrode pattern with reflective properties is introduced to reflect the downward-emitted light upward, transforming the energy that would have been wasted into useful light output, thereby improving overall light emission efficiency without changing the emission characteristics of the light emitting elements themselves
2Illumination intensity
If reflective electrode pattern is added to improve light emission efficiency, then luminance is improved, but device complexity is worsened
Solution Approach 1:
The patent merges the reflective electrode pattern with the existing electrode layer structure of the display device. The electrode pattern is formed at the same layer as the first and second electrodes, integrating the light reflection function into the existing electrical structure rather than adding a completely separate component layer, thereby reducing structural complexity while achieving improved luminance
Solution Approach 2:
The electrode pattern serves multiple functions simultaneously: it acts as both an electrical conductor (maintaining electrode functionality) and a reflective surface (improving light emission efficiency). This multi-functionality reduces the need for additional dedicated reflective components, thereby minimizing device complexity while achieving the luminance improvement goal
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
Enhances light emission efficiency by reducing light loss downward, thereby improving the luminance of the display device.
Implementation Method 1
an electrode pattern at a same layer as the first electrode and the second electrode and overlapping the plurality of light emitting elements in a thickness direction
Data Source
AI summary
A display device includes a thin film transistor layer including at least one transistor on a substrate; a first electrode on the thin film transistor layer and connected to the at least one transistor; a second electrode spaced from the first electrode on the thin film transistor layer; a plurality of light emitting elements connected to the first electrode and the second electrode; and an electrode pattern on a same layer as the first electrode and the second electrode and overlapping the plurality of light emitting elements in a thickness direction.