Display Sensor Circuit Sub-Pixel Aperture Ratio Balance
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Solution Overview
Problem
Display devices with integrated sensors, such as fingerprint and vein sensors, face a challenge in maintaining display quality due to the reduction in aperture ratio caused by the presence of optical sensors, which affect the pixel's ability to emit light effectively.
Innovation Solution
The display device incorporates a sensor circuit with switching elements distributed across multiple sub-pixels, allowing for balanced aperture ratios and preventing a decrease in display quality by arranging switching elements in each of the red, green, and blue sub-pixels, thereby optimizing the placement of sensor components without compromising image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an optical sensor is provided in a pixel, then sensing function is achieved, but the aperture ratio is lowered and display quality decreases
Solution Approach 1:
The pixel is divided into multiple sub-pixels (first sub-pixel, second sub-pixel, third sub-pixel), and the sensor circuit elements are distributed across these sub-pixels. This segmentation allows the sensing function to be achieved while maintaining the aperture ratio of individual display sub-pixels, as the sensor elements occupy space that would otherwise be non-functional for light emission.
Solution Approach 2:
The sensor circuit elements (switching elements) are merged with the pixel structure by placing them within the pixel area. Specifically, switching elements are positioned in areas where sub-pixels are arranged, allowing the sensor circuit to share the pixel space without significantly reducing the light-emitting aperture ratio.
2Device complexity
If sensor circuit elements are concentrated in one area, then circuit functionality is achieved, but aperture ratio imbalance occurs across sub-pixels
Solution Approach 1:
The sensor circuit is segmented into multiple switching elements that are distributed across different sub-pixels. Each sub-pixel contains at least one switching element, which segments the circuit functionality across the pixel area and prevents concentration of all circuit elements in one location.
Solution Approach 2:
Different sub-pixels have different local configurations of switching elements based on their functional requirements. The first sub-pixel has a different arrangement compared to the second and third sub-pixels, allowing each to maintain optimal aperture ratio while contributing to the overall sensor circuit functionality.
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 configuration maintains balanced aperture ratios across sub-pixels, preventing a degradation in display quality and enabling accurate sensing while maintaining effective image display capabilities.
Implementation Method 1
a liquid crystal layer, and a second substrate opposed to the first substrate, with the liquid crystal layer interposed between the first substrate and the second substrate
Implementation Method 2
an optical sensor using a photoelectric conversion element is used
Data Source
AI summary
According to one embodiment, a display device includes a first substrate, a second substrate and a liquid crystal layer. The first substrate includes a base, a sensor and a sensor circuit. The sensor is interposed between the base and the liquid crystal layer in a display area including pixels. The sensor outputs a sensing signal corresponding to light incident from alongside the liquid crystal layer. The sensor circuit includes a plurality of switching elements. The pixels include first to third sub-pixels. At least some of elements of the switching elements are arranged in each of areas where the first to third sub-pixels are arranged. A signal line for the sensor, which outputs the sensing signal, is placed on a same layer as a feeding line connected to the sensor.