Pixel Sensing Circuit Channel Selection for Test Time Reduction
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Solution Overview
Problem
The sequential testing of pixel sensing circuits is inefficient as it requires testing all channels, including those that are not necessary, leading to increased test time and data processing requirements.
Innovation Solution
A channel selecting circuit is used to identify and test only specific representative channels within the pixel sensing circuit by controlling the supply of a test current and driving an amplifier, allowing for selective testing of desired channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sequential testing is performed on all channels of the pixel sensing circuit, then comprehensive testing coverage is achieved, but test time increases significantly
Solution Approach 1:
The pixel sensing circuit is divided into multiple groups, with each group containing multiple channels. Instead of testing all channels individually, the invention tests one representative channel from each group. This segmentation approach reduces the total number of test channels from N (total channels) to M (number of groups), significantly decreasing test time while maintaining comprehensive coverage through representative sampling.
Solution Approach 2:
The invention uses a representative channel as a copy or proxy for other channels within the same group. By testing the representative channel and applying its test results to infer the status of other channels in the group, the system achieves comprehensive testing coverage without actually testing every single channel, thus resolving the contradiction between thorough testing and time consumption.
2Measurement precision
If all channels are tested sequentially, then complete testing data is obtained, but data processing amount increases
Solution Approach 1:
The invention extracts and tests only the essential representative channel from each group, removing the redundant testing of non-representative channels. This extraction principle reduces the quantity of test data from N channel results to M representative results, directly decreasing the data processing amount while preserving testing completeness through the representative nature of the selected channels.
3Ease of operation
If sequential testing is used for pixel sensing circuit, then each channel can be tested individually, but testing efficiency decreases
Solution Approach 1:
By segmenting the channels into groups and selecting one representative channel per group, the invention maintains the simplicity of individual channel testing (ease of operation) while dramatically improving testing efficiency. The segmented approach allows for systematic testing without the inefficiency of testing every single channel, thus resolving the contradiction between operational simplicity and testing productivity.
Data Source
AI summary
The present disclosure relates to a pixel sensing circuit in which a test is performed only on selected specific channels among channels of the pixel sensing circuit and the total test time of the pixel sensing circuit and data throughput for the test may be reduced.