2T1C Pixel Circuit Step-Down Voltage for Under-Screen Camera
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current under-screen camera technologies face challenges in improving light transmittance due to the operating voltage of conventional 2T1C pixel circuits not being within the normal data voltage range, making them unsuitable for use in the under-screen camera area.
Innovation Solution
A pixel circuit comprising a data line, scan line, hierarchical 2T1C circuits, a step-down circuit, and a reset circuit is designed, where the reset circuit includes a first driving transistor for resetting the 2T1C circuits with a reset voltage signal and a second driving transistor for capturing and writing the source data signal, along with a voltage stabilizing capacitor to stabilize the voltage input to the 2T1C circuits, allowing the 2T1C pixel circuit to operate within the same voltage range as the 7T1C pixel circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional 2T1C pixel circuit is used in the under-screen camera area, then the light transmittance can be improved, but the operating voltage is not within the normal data voltage range given by the driving circuit
Solution Approach 1:
The patent modifies the voltage parameters of the 2T1C pixel circuit by introducing a step-down circuit that converts the data voltage from the normal range (2.5V-5.5V) to a lower range (0V-3V). This parameter transformation enables the 2T1C circuit to operate within compatible voltage ranges while maintaining its high light transmittance advantage in the under-screen camera area.
2Illumination intensity
If the pixel density is reduced in the under-screen camera area to improve light transmittance, then the light transmittance improves, but the operating voltage of the 2T1C circuit remains incompatible
Solution Approach 1:
The patent introduces a step-down circuit as an intermediary component between the driving circuit and the 2T1C pixel circuit. This intermediary transforms the voltage output from the driving circuit into a suitable voltage level for the 2T1C circuit, enabling voltage compatibility without requiring changes to either the driving circuit or the pixel circuit structure.
3Reliability
If a 7T1C pixel circuit is used, then the operating voltage is within the normal data voltage range, but the light transmittance in the under-screen camera area is insufficient
Solution Approach 1:
The patent segments the display area into different regions with different pixel circuit types. The under-screen camera area uses 2T1C pixel circuits optimized for high light transmittance, while other areas use 7T1C pixel circuits with standard voltage compatibility. A step-down circuit is applied specifically to the 2T1C region to resolve voltage compatibility issues, allowing each segment to optimize for its specific function.
Data Source
AI summary
A pixel circuit and a display panel are provided. The display includes the pixel circuit. The pixel circuit includes a data line, a scan line, a plurality of hierarchical 2T1C circuits, a step-down circuit, and a reset circuit. The data line is configured to transmit a source data signal. The scan line is configured to transmit a scan signal. Each input of the plurality of hierarchical 2T1C circuits is connected to the scan line in parallel. An input of the step-down circuit is connected to the data line and an output of the step-down circuit is connected to another input of each 2T1C circuit. The reset circuit is connected to the input of the step-down circuit.