Collimating Layer Merged With Power Supply Line
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Solution Overview
Problem
Display devices with built-in sensors for biometric information detection, such as fingerprint or vein sensors, face challenges in achieving high detection accuracy due to non-parallel light incidence, which affects the performance of optical sensors.
Innovation Solution
Incorporating a collimating layer made of metal material with a light-shielding property between the sensor and the liquid crystal layer, this layer functions as a collimator to ensure only light parallel to the normal direction enters the sensor, improving detection accuracy by shutting off tilted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a collimating layer is added to improve detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The collimating layer is merged with the power supply line structure, combining two functional elements into a single integrated component. This reduces the total number of separate layers while maintaining both the collimating function for improved detection accuracy and the power supply function, thereby resolving the contradiction between measurement precision and device complexity
Solution Approach 2:
The power supply line is designed to serve dual purposes: it provides electrical power to the sensor while simultaneously functioning as a collimating layer that directs light parallel to the sensor surface. This multi-functionality eliminates the need for a separate collimating layer, improving detection accuracy without increasing device complexity
2Reliability
If multiple separate layers are used for sensor components, then functional reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
By merging the collimating layer with the power supply line, the patent reduces the number of separate layers that require precise alignment during manufacturing. This integration maintains the functional reliability of both collimation and power supply while lowering the stringent alignment precision requirements that would otherwise be necessary for multiple separate layers
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 collimating layer enhances the detection accuracy of the sensor by allowing only parallel light to enter, thereby improving the detection of biometric information like fingerprints or vein patterns, and can be integrated as part of the power supply line, reducing unnecessary layer stacking and increasing pixel opening ratio.
Implementation Method 1
a collimating layer made of metal material with a light-shielding property between the sensor and the liquid crystal layer
Implementation Method 2
an optical sensor using a photoelectric conversion element is employed
Data Source
AI summary
According to one embodiment, a display device includes a first substrate, a second substrate facing the first substrate and a liquid crystal layer. The first substrate includes a base material, and a sensor which outputs a detection signal based on incident light from a liquid crystal layer side. The sensor includes a photoelectric conversion element including a first surface and a second surface, a first electrode which is in contact with the first surface, and a second electrode which is in contact with the second surface. Each of the photoelectric conversion element and the second electrode is formed in an irregular shape having a plurality of curved portions and a plurality of straight portions connecting the curved portions as seen in plan view.