Image Sensor Array Switch Line Signal Overlap
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Solution Overview
Problem
The existing image sensor arrays, particularly those using amorphous silicon TFT-LCDs, face limitations in readout time due to transient photocurrent states, which restrict resolution and stability, making it challenging to efficiently detect light over extended periods.
Innovation Solution
The image sensor array is configured with specific switch line signal overlapping and a time division method to increase readout time, allowing for stable photocurrent detection by positioning sensor elements strategically and overlapping switch line signals, thereby extending the readout period and improving resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the readout time is extended to improve stable photocurrent detection, then the resolution and detection capability are improved, but the transient photocurrent state occupies more time and reduces readout efficiency
Solution Approach 1:
The sensor array is divided into multiple sensor elements with different switch line configurations. Some sensor elements use first switch lines while others use second switch lines, allowing segmentation of the readout process into different time segments. This enables stable photocurrent detection without extending the overall readout time, as different segments can be read out in parallel or sequentially optimized.
Solution Approach 2:
The patent introduces a temporal dimension by using overlapping switch line signals with different phases. The first and second switch lines are configured to operate in overlapping time periods, effectively utilizing time as an additional dimension to increase the effective readout time for stable photocurrent detection without proportionally increasing the total measurement time.
2Duration of action of moving object
If the sensor array uses conventional switch line configuration, then the device complexity is low, but the readout time is insufficient for stable detection
Solution Approach 1:
The patent merges the functions of multiple switch lines by configuring them to overlap in time. The first switch line and second switch line are combined in such a way that their signal periods overlap, effectively doubling the active readout time for certain sensor elements without requiring completely separate readout circuits for each line.
Solution Approach 2:
The switch lines are configured to operate periodically with overlapping cycles. The first switch line and second switch line have periodic signal patterns that overlap, creating extended periods during which sensor elements can be read out with stable photocurrent. This periodic overlapping action increases the effective readout duration without requiring continuous switching.
3Area of stationary object
If sensor elements are positioned at all intersections of readout lines and switch lines, then the detection coverage is maximized, but the transient state affects more readout lines and reduces overall efficiency
Solution Approach 1:
Different regions of the sensor array are assigned different switch line configurations. Sensor elements in certain regions use first switch lines while others use second switch lines with overlapping signal periods. This local differentiation allows areas experiencing transient states on one switch line to be simultaneously read out using another switch line with non-overlapping transient periods, maintaining high readout efficiency across the entire array.
Solution Approach 2:
The patent implements dynamic readout strategies where the selection of which switch line to use for reading a particular sensor element can vary based on the current operational state. During transient periods of one switch line, the system dynamically switches to using the other overlapping switch line for reading the same sensor elements, thereby maintaining continuous efficient readout across the entire sensor array coverage.
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 effectively increases the readout time of the image sensor array, reducing the impact of transient states and enhancing the detection capability, enabling better light detection and improved display quality in liquid crystal displays.
Implementation Method 1
The photosensing device 10 generates a photocurrent in response to received light
Data Source
AI summary
The present invention provides an image sensor array and a liquid crystal display for increasing the readout time thereof. The image sensor array and liquid crystal display both comprise a substrate, a readout line disposed on the substrate, a first switch line and a second switch line both intersecting the readout line, a first position defined by the readout line and the first switch line, a second position defined by the readout line and the second switch line, and a sensor element disposed on the first position and separated from the second position, wherein the first switch line transmitting a first switch signal and the second switch line transmitting a second switch signal overlapped the first switch signal.