Display Pixel Reading Circuit for Common-Noise Removal
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Solution Overview
Problem
Existing display modules face challenges in effectively reading light-receiving signals and removing common noise from these signals, which affects their performance in applications such as fingerprint authentication and image capturing.
Innovation Solution
A display module incorporating a differential input circuit that generates equal currents from light-receiving signals and a ramp signal, allowing for the removal of common noise, and utilizing light-emitting and light-receiving elements with shared layers to integrate image display and sensing functions without increasing component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a light-receiving element is integrated into each pixel of the display apparatus, then the display apparatus can perform image capturing and fingerprint authentication functions, but the display apparatus cannot effectively read the light-receiving signals and remove common noise, resulting in poor sensing performance
Solution Approach 1:
A reading circuit is introduced as an intermediary component between the light-receiving elements and the processing system. This reading circuit includes a signal reading unit and a noise removal unit that work together to accurately read light-receiving signals and remove common noise, thereby resolving the contradiction between adding sensing functions and maintaining signal reading accuracy
Solution Approach 2:
The noise removal function is extracted as a separate unit within the reading circuit. By taking out the common noise removal process from the overall signal processing chain and dedicating a specific unit to it, the system can effectively eliminate common noise while preserving the light-receiving signal quality, thus improving measurement precision
2Adaptability or versatility
If separate light-receiving elements and light-emitting elements are provided, then the display apparatus can perform both display and sensing functions, but the number of components increases
Solution Approach 1:
The display apparatus is designed with multi-functionality by integrating light-receiving elements within the pixel structure that already contains light-emitting elements. Each pixel can thus serve both display purposes (through light-emitting elements) and sensing purposes (through light-receiving elements), reducing the need for separate dedicated sensing components and lowering overall 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 solution enables accurate reading of light-receiving signals with reduced noise, enhancing fingerprint authentication and image capturing capabilities while reducing the number of components needed in electronic devices.
Implementation Method 1
a first pixel and a second pixel adjacent to each other, and each of the first pixel and the second pixel includes a light-receiving element
Data Source
AI summary
Common noise is reduced from light-receiving data. A display module includes a display apparatus and a reading circuit. Each of a first pixel and a second pixel adjacent to each other in the display apparatus includes a light-receiving element and a light-emitting element. The reading circuit includes a differential input circuit. Common noise generated when display data is supplied to a light-emitting element, for example, may affect a first light-receiving signal output by the first pixel and a second light-receiving signal output by the second pixel. A first current is generated using the first light-receiving signal and a ramp signal, and a second current is generated using the second light-receiving signal and a first potential. The differential input circuit is controlled so that the first current and the second current have the same current value, whereby common noise can be removed from the first light-receiving signal.