Pixel Circuit with Shared Transistors for Under-Display Camera
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Solution Overview
Problem
Active Matrix/Organic Light Emitting Diode (AMOLED) display apparatuses require external cameras for photographing, which occupy non-display regions, hindering narrow frame designs and complicating manufacturing.
Innovation Solution
Integration of a detection circuit within the pixel circuit, sharing transistors with the display driving circuit, allowing for incident light collection and threshold voltage compensation, enabling the pixel circuit to function as a photosensitive element without external cameras, thus eliminating the need for additional space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate camera component is mounted on the display apparatus to realize photographing function, then the photographing function is achieved, but the non-display region is occupied and frame design flexibility is reduced
Solution Approach 1:
The patent merges the camera function with the display panel by integrating a detection circuit directly into the pixel circuit structure. The detection circuit shares transistors with the display driving circuit, combining two separate functions (display and photographing) into a single integrated structure, thereby eliminating the need for separate camera components and freeing up non-display region space.
Solution Approach 2:
The pixel circuit is designed to perform multiple functions: it serves both as a display element and as a photosensitive detection element. By making the pixel circuit universal, the patent eliminates the need for dedicated separate components for photographing, thus avoiding occupation of non-display regions while maintaining full photographing functionality.
2Adaptability or versatility
If a separate camera component is mounted on the display apparatus, then the photographing function is achieved, but the manufacturing process becomes more complex
Solution Approach 1:
The detection circuit is merged with the existing pixel circuit structure, sharing common transistors and integration layers. This merging approach allows both display and photographing functions to be manufactured using the same fabrication processes, eliminating the need for separate camera component assembly and simplifying the overall manufacturing process.
3Area of stationary object
If transistors are shared between detection circuit and display driving circuit, then the structure is simplified and space is saved, but the circuit design becomes more complex
Solution Approach 1:
The same transistor structures are designed to serve dual purposes: controlling display current and enabling light detection. By creating universal transistor designs that can function in both contexts, the patent reduces the total number of components needed while the added design complexity is confined to the transistor-level architecture rather than requiring separate dedicated circuits.
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
Enables the realization of a photographing function within the display panel without occupying non-display regions, simplifying the manufacturing process and improving frame design flexibility.
Implementation Method 1
the detection circuit comprises a first transistor, a light-sensitive control transistor, a third transistor, the driving transistor, the ninth transistor, and a photodiode
Data Source
AI summary
Aspects of the present disclosure provide a pixel circuit, a method for driving the same, and a display apparatus. The pixel circuit comprises a display driving circuit. The display driving circuit comprises a reset sub-circuit, a writing sub-circuit, a driving sub-circuit, a light-emitting control sub-circuit, and a light-emitting device. The reset sub-circuit is configured to reset the driving sub-circuit. The writing sub-circuit is configured to write a data voltage into the driving sub-circuit. The light-emitting control sub-circuit is connected to the driving sub-circuit and an anode of the light-emitting device and is configured to provide driving current, through the driving sub-circuit, for causing the light-emitting device to emit light. The pixel circuit further comprises a detection circuit configured to collect incident light and output a collection result to the read signal line. One or more transistors are shared between the detection circuit and the display driving circuit.