Display Device Sensor Pixel Anode Size Variation
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Solution Overview
Problem
Current display devices face challenges in efficiently integrating biometric information detection with display functionality, particularly in accurately sensing user inputs and maintaining image quality due to limitations in sensor pixel configurations and light emission layer designs.
Innovation Solution
The display device incorporates a base layer with a pixel layer featuring reference pixel units and sensors, where each reference pixel unit includes first and second light emitting elements with distinct anode electrodes and light emitting layers, and sensors connected to a driving circuit, allowing for precise light detection and improved user input sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If sensors are integrated into the pixel layer with light detection elements corresponding to reference pixel units, then biometric information detection capability is improved, but device complexity increases
Solution Approach 1:
The patent combines display functionality and biometric sensing functionality into a single integrated structure. The sensor layer is merged with the pixel layer such that light detection elements are positioned to correspond with reference pixel units, allowing the display device to perform both display and fingerprint sensing functions without requiring separate dedicated sensor modules.
Solution Approach 2:
The display device structure is designed to serve multiple functions: displaying images through light emitting elements and detecting biometric information through light detection elements. The same layered structure supports both optical emission for display and optical detection for sensing, making the device universal in its functionality.
2Measurement precision
If light detection elements are positioned to correspond with reference pixel units, then measurement precision of user input is improved, but device complexity increases
Solution Approach 1:
The sensing function is segmented and assigned to specific light detection elements that correspond to reference pixel units. This segmentation allows precise localization of user input by mapping detected light patterns to specific pixel positions, improving measurement precision while maintaining a relatively simple overall structure.
3Adaptability or versatility
If anode electrodes of light emitting elements have different sizes, then adaptability of light emission patterns is improved, but manufacturing precision requirements increase
Solution Approach 1:
Different anode electrodes are designed with different sizes according to their specific functional requirements. Reference pixel units that require higher light output or different emission characteristics have anode electrodes with sizes optimized for those purposes, while other pixels use different sizes. This local differentiation improves adaptability of light emission patterns while the manufacturing process maintains precision through standardized fabrication techniques.
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
This configuration enhances the display device's ability to detect biometric information and maintain image quality by ensuring accurate light emission and detection, thereby improving user input sensing and overall display performance.
Implementation Method 1
Each of the plurality of sensors includes at least one light detection element disposed to correspond to one of the reference pixel units
Data Source
AI summary
A display device includes a base layer, and a pixel layer including a reference pixel unit and sensor. The reference pixel unit includes first and second light emitting elements emitting a first color light. The sensor includes a light detection element disposed corresponding to the reference pixel unit, and a sensor driving circuit electrically connected to the light detection element. Each of the first and second light emitting elements includes an anode electrode, and a light emitting layer. The light emitting layer of the first light emitting element has the same size as the light emitting layer of the second light emitting element, and the anode electrode of the first light emitting element has a size that is different from that of the anode electrode of the second light emitting element.