Display Pixel Light Sensor Layout for Lower Coupling Interference
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Solution Overview
Problem
Existing display devices face challenges in improving the sensing accuracy of light sensors, particularly in integrating them with display panels without compromising the performance of sub-pixels.
Innovation Solution
A display device design that includes a sub-pixel connected to a data line and a light sensor adjacent to it, with a specific conductor configuration to minimize coupling between conductors, and a control signal system to enhance light sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light sensor is integrated adjacent to a sub-pixel in the display device, then the sensing accuracy of the light sensor is improved, but the coupling interference between conductors increases
Solution Approach 1:
The patent introduces a shielding conductor as an intermediary element positioned between the readout line and data line. This shielding conductor acts as a mediator that blocks electromagnetic coupling interference from the data line, thereby protecting the light sensor's readout signal while maintaining the integrated layout that provides improved sensing accuracy
Solution Approach 2:
The patent extracts the harmful coupling effect by separating the readout line and data line spatially and introducing a shielding conductor to isolate them. This extraction approach removes the interference pathway while preserving the beneficial integration of the light sensor adjacent to the sub-pixel
2Device complexity
If conductors are arranged closely to integrate light sensor and sub-pixel, then device complexity is reduced, but coupling between conductors increases
Solution Approach 1:
The patent segments the conductor arrangement by introducing a shielding conductor that divides the space between the readout line and data line. This segmentation creates distinct electromagnetic zones, reducing coupling interference while maintaining a relatively simple integrated layout structure
Solution Approach 2:
The shielding conductor serves as an intermediary element that simplifies the overall conductor arrangement by providing a clear spatial separation mechanism. This intermediary structure reduces coupling interference without significantly increasing device complexity, as it follows the same conductor formation process
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 proposed design enhances the sensing accuracy of light sensors by reducing interference and improving the transmission of light-related currents, thereby enhancing user authentication capabilities.
Implementation Method 1
at least one of the first conductor or the second conductor may be configured to shield coupling to the third conductor from the fourth conductor
Implementation Method 2
a first light receiving element connected between a second electrode of the fourth sensing transistor and a power voltage, and a second light receiving element connected between the second electrode of the fifth sensing transistor and the power voltage
Data Source
AI summary
A display device includes: a sub-pixel connected to a data line; and a light sensor adjacent to the sub-pixel in a first direction and connected to a readout line, a first element control line, and a second element control line, wherein the readout line is configured to receive a current corresponding to a light amount of light applied to the light sensor, and in an area where the light sensor is formed, a third conductor configuring a portion of the readout line is between a first conductor configuring a portion of the first element control line and a second conductor configuring a portion of the second element control line.