Self-Luminous Display Panel Reflection Control Without Luminance Loss
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Solution Overview
Problem
Self-luminous display panels, such as OLEDs, suffer from lower luminance and reflections due to metallically reflective elements, and existing solutions like circular polarization filters reduce luminance further while not effectively addressing reflection issues.
Innovation Solution
A display element with a self-luminous panel, metallically reflective elements, and a polarization-independent reflected light suppression layer with 10-30% transmission, combined with a matte surface and compensation elements to minimize reflection and maintain luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a circular polarization filter is used to suppress reflections from metallically reflective elements, then reflection is reduced and contrast is improved, but luminance is significantly reduced due to low transmission (approximately 40%)
Solution Approach 1:
The patent changes the key parameter from circular polarization filter (40% transmission) to a linear polarization-independent reflected light suppression layer with 10-30% transmission. This parameter change maintains reflection suppression capability while optimizing the transmission characteristic to balance between reflection reduction and luminance preservation.
Solution Approach 2:
The patent substitutes the circular polarization filter system with a reflected light suppression layer that operates on a different optical principle - using a matte surface with specific transmission characteristics (10-30%) to suppress reflections without the polarization-dependent light absorption mechanism, thereby improving overall light efficiency.
2Object-affected harmful factors
If a black layer (black matrix) is arranged behind the OLED layer to absorb reflected light, then reflection is suppressed, but most light generated by the self-luminous pixels is absorbed and does not contribute to luminance, causing heating of the OLED layer
Solution Approach 1:
The patent extracts the light absorption function from the position behind the OLED layer and relocates it to a reflected light suppression layer positioned in front of the OLED layer. This extraction prevents the absorption of emitted light while still achieving reflection suppression, and the absorbed light does not heat the sensitive OLED layer.
Solution Approach 2:
The patent introduces a reflected light suppression layer as an intermediary element between the external environment and the OLED layer. This intermediary absorbs externally incident light before it reaches the metallically reflective elements, preventing reflection without interfering with the light emitted by the OLED layer.
3Illumination intensity
If non-self-luminous display elements use a bright backlight to achieve high luminance, then luminance is improved, but the display cannot achieve true black in the peripheral region since minimal transmission is always greater than zero
Solution Approach 1:
The patent employs self-luminous OLED pixels that generate their own light, eliminating the need for a backlight. Each pixel can independently control its light emission, allowing for true black display content by simply turning off the OLED pixels in the peripheral region, achieving minimal transmission closer to zero.
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 solution significantly reduces external reflections by 91-99% while maintaining emitted light intensity, allowing for thinner, bendable designs and improved contrast without the need for backlights, suitable for curved surfaces and decorative applications.
Implementation Method 1
a reflected light suppression layer (3), in particular a light-absorbing layer, which is arranged behind the self-luminous display panel (2) and has a polarization-independent transmission between 10% and 30%
Implementation Method 2
If the self-luminous display panel is based on OLED technology (OLED: organic light-emitting diode)
Implementation Method 3
The reflected light suppression layer has a rough, matte surface
Data Source
AI summary
The present disclosure relates to a display element comprising a substrate, a self-luminous display panel, which is arranged on the substrate and has metallically reflective elements on its lower side facing toward the substrate, a surface screen, to which the upper side of the display panel facing away from the substrate is connected, and a reflected light suppression layer, wherein the reflected light suppression layer has a polarization-independent transmission between 10% and 30%.