Pixel Circuit With Dual-Function Light Emitting Element
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Solution Overview
Problem
Conventional mobile electronic devices require a dedicated camera area for image acquisition, which complicates their structural design and appearance, and they lack integrated light sensing capabilities for functions like fingerprint recognition.
Innovation Solution
A pixel circuit incorporating a light emitting element and a dual-function driving circuit that enables both light emission and light sensing by controlling the light emitting element to operate in forward-biased and reversely-biased states for image display and light sensing functions, respectively, allowing each pixel unit to acquire light information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a dedicated camera area is reserved on the mobile electronic device, then light sensing capability is achieved, but device structure and appearance become complicated
Solution Approach 1:
The light emitting element is designed to perform multiple functions: it can emit light for display purposes and sense light for imaging or fingerprint recognition. By controlling the element to operate in forward-biased state for light emission and reverse-biased state for light sensing, the patent eliminates the need for separate dedicated camera areas, thereby simplifying device structure while maintaining light sensing capability.
2Illumination intensity
If the light emitting element operates in forward-biased state, then light emission function is achieved, but light sensing function cannot be performed
Solution Approach 1:
The operating state of the light emitting element is made dynamic rather than static. The element can switch between forward-biased state (for light emission) and reverse-biased state (for light sensing) based on operational requirements. This dynamic state change allows the same element to fulfill both light emission and light sensing functions at different times.
3Adaptability or versatility
If the light emitting element operates in reverse-biased state, then light sensing function is achieved, but light emission function cannot be performed
Solution Approach 1:
The light emitting element operates in periodic cycles, alternating between light emission mode (forward-biased) and light sensing mode (reverse-biased). During light sensing operation, the element is switched to reverse-biased state to detect external light or fingerprint patterns. After sensing, it switches back to forward-biased state for light emission. This periodic switching enables both functions to be performed sequentially using the same element.
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 solution simplifies the device design by eliminating the need for a dedicated camera area, enhances the display device's functionality with integrated light sensing, and enables applications like fingerprint recognition through the light sensing function.
Implementation Method 1
the light emitting element to convert external light incident on the light emitting element into an electrical signal to realize a light sensing function
Data Source
AI summary
A pixel circuit, a display panel, and a display device comprising the pixel circuit. The pixel circuit comprises a light emitting element and a driving circuit. The driving circuit comprises a light emission driving circuit for driving the light emitting element to emit light, and a light sensing driving circuit for controlling the light emitting element to convert external light incident on the light emitting element into an electrical signal. The pixel circuit integrates the light emission driving circuit with the light sensing driving circuit and can achieve the light sensing function for the screen of the display device, which makes it possible to not reserve an area dedicated to a camera on the surface of the display device.