Touch Display Microlens Structure for Higher Luminance
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Solution Overview
Problem
Conventional touch display devices face challenges in securing enough light emitting area for displaying images while achieving improved luminance.
Innovation Solution
A touch display device with a design that includes a substrate, insulating film with concave portions, a first electrode, bank, light emitting layer, second electrode, encapsulation layer, touch buffer layer, touch electrodes, and a planarization layer, featuring a microlens unit in the planarization layer to enhance luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional touch display device structures are used, then device simplicity is maintained, but luminance is insufficient and light emitting area is limited
Solution Approach 1:
The insulating film is segmented into multiple regions including concave portions with flat portions and inclined portions, creating distinct functional zones within the sub-pixel structure. This segmentation allows optimized light emission from different regions while maintaining overall structural organization.
Solution Approach 2:
A microlens unit is added in the planarization layer above the concave portion, introducing a new dimensional element for light control. This microlens structure focuses and directs light emission, significantly improving luminance without fundamentally redesigning the entire device architecture.
2Area of stationary object
If light emitting area is increased, then luminance improves, but device structure becomes more complex
Solution Approach 1:
Different regions of the insulating film are given different qualities: the concave portion with flat region provides a specific light emission area, while the inclined portion surrounding it provides additional emission area. The microlens unit is locally positioned to focus light from the concave portion, optimizing light emission without uniformly complicating the entire structure.
3Illumination intensity
If microlens unit is added to improve luminance, then light emission is enhanced, but device complexity increases
Solution Approach 1:
The planarization layer serves multiple functions: it provides structural planarity for subsequent layers and simultaneously houses the microlens unit for light focusing. This multi-functionality allows luminance enhancement without adding entirely separate structural elements, thereby limiting the increase in device complexity.
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 design improves luminance by optimizing light emission characteristics and preventing device deterioration, resulting in enhanced display performance.
Implementation Method 1
a planarization layer, and the microlens unit may be positioned in a region corresponding to the concave portion
Data Source
AI summary
A display device includes a flexible substrate, a transistor disposed on the flexible substrate, having a source electrode, a drain electrode, a gate electrode and an active layer, a planarization layer on the transistor, an anode on the planarization layer, a bank surrounding the anode, having an opening area, an emission layer and a cathode layer on the anode, an encapsulation unit on the cathode layer, including a first organic layer, an inorganic layer and a second organic layer, a plurality of touch electrodes on the encapsulation unit, formed in a mesh type corresponding to a non-opening area of the bank, a microlens unit on the plurality of touch electrodes, having a refractive index different from that of one of the first and second organic layers, and a color filter layer on the microlens unit and the encapsulation unit.