Display Device Photo Sensor Signal Summing for Noise Resistance
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Solution Overview
Problem
In display devices incorporating photo sensors, the low output signal level of photo sensors makes it difficult to distinguish sensing signals from noise, especially when charges are stored due to incident light, leading to reduced sensitivity and accuracy in touch or fingerprint recognition.
Innovation Solution
The implementation of a display device with a plurality of photo sensors connected through a sensing line, where the output signals of at least two photo sensors are summed to increase the signal level, and the operation timings of sample/hold switches are adjusted to enhance the sensing signal, allowing for improved noise resistance and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a photo sensor is connected to a gate line and a separate sensing line is provided, then the photo sensor can be driven and its output can be taken to the detection circuit, but the output signal level of the photo sensor remains low making it difficult to distinguish from noise
Solution Approach 1:
The patent merges multiple photo sensors (first photo sensor and second photo sensor) connected to the same sensing line, allowing their output signals to be summed together. This combining approach increases the overall signal level while maintaining a shared sensing line, thereby improving the ability to distinguish the sensing signal from noise without requiring separate sensing lines for each photo sensor.
2Reliability
If charges are stored in the photo sensor due to incident light, then the photo sensor can detect light intensity, but the sensing signal level becomes small and difficult to distinguish from noise on the sensing line
Solution Approach 1:
The patent combines the outputs of multiple photo sensors (first photo sensor and second photo sensor) that share the same sensing line. By summing the signals from multiple sensors, the overall signal level is amplified, making it easier to distinguish from noise and improving the reliability of photo input detection.
Solution Approach 2:
The patent utilizes the vertical dimension by arranging photo sensors on different horizontal lines (first horizontal line and second horizontal line) while sharing a common sensing line. This spatial arrangement in another dimension allows multiple sensors to contribute to the same signal path without interference, effectively increasing signal strength without compromising measurement precision.
3Device complexity
If multiple photo sensors share a common sensing line, then the device complexity is reduced, but the signal level from each individual sensor remains low
Solution Approach 1:
The patent merges multiple photo sensors (first photo sensor and second photo sensor) that share the same sensing line, allowing their output signals to be summed together. This combining approach increases the overall signal level while maintaining a shared sensing line, thereby improving the ability to distinguish the sensing signal from noise without requiring separate sensing lines for each photo sensor.
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 approach significantly increases the sensitivity and robustness of the photo input, enabling better distinction between sensing signals and noise, thereby improving the accuracy of touch or fingerprint recognition in display devices.
Implementation Method 1
The photo sensor is a device that stores the charge amount corresponding to a light intensity as information
Implementation Method 2
the charges stored in the photo sensor are transferred to the detection circuit through the sensing line
Data Source
AI summary
The display device of the present disclosure may comprise a display panel equipped with pixels each representing image data and photo sensors each outputting an electric signal through a sensing line responding to light, a data driving circuit providing a data voltage corresponding to the image data to the pixel through a data line, a gate driving circuit supplying, through a gate line, a scan signal for controlling an application of the data voltage to the pixel disposed on a horizontal line and for controlling a connection of the photo sensor disposed on a corresponding horizontal line and the sensing line, a sensing driving circuit outputting digital sensing data by summing the electric signals of two photo sensors disposed on different horizontal lines and sharing the sensing line; and a timing controller supplying control signals for controlling the data driving circuit, the gate driving circuit and the sensing driving circuit.