Liquid Crystal Display Probe Unit Channel Reduction
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Solution Overview
Problem
The existing methods for testing liquid crystal displays require a large number of channels in the probe unit, increasing costs and making it difficult to accurately align data connector pads with data pads as the resolution of the liquid crystal panel increases, due to the need for the same number of data connector pads as data pads and the complexity of aligning them at closer pitches.
Innovation Solution
The method involves dividing the liquid crystal panel into vertically and horizontally grouped blocks, with a data probe unit providing test pattern signals to groups of blocks and a gate probe unit providing scanning signals, reducing the number of data connector pads by using common test pattern signals across groups of blocks and forming separate test pad portions to improve alignment accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of data connector pads is increased to match the number of data pads in high-resolution liquid crystal panels, then the testing capability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent merges multiple data connector pads into groups that share common test pattern signals. Instead of requiring a separate data connector pad for each data pad on the liquid crystal panel, the invention groups adjacent data pads together and uses a single data connector pad to provide test signals to multiple data pads simultaneously, thereby reducing the number of channels in the probe unit while maintaining testing capability
Solution Approach 2:
The data connector pads are designed to serve multiple functions by being able to drive multiple data pads through signal distribution. Each data connector pad can act as a universal signal source that feeds test patterns to multiple data pads, eliminating the need for dedicated one-to-one connections and reducing the overall number of channels required
2Measurement precision
If the pitch between data pads is decreased to increase resolution, then the display quality is improved, but the alignment precision between data connector pads and data pads deteriorates
Solution Approach 1:
By grouping multiple data pads together and connecting them to a single data connector pad, the invention reduces the number of individual alignment operations required. Instead of aligning each data connector pad with its corresponding data pad at closely spaced pitches, the system aligns fewer connector pads that serve multiple pads, thereby maintaining alignment precision even at high resolutions
Solution Approach 2:
The patent segments the data pad array into groups of adjacent data pads that share common test pattern signals. This segmentation approach allows for fewer, more spaced-out data connector pads that are easier to align accurately, while still providing comprehensive testing coverage across the entire high-resolution panel through the grouped structure
Data Source
AI summary
An LCD test method and apparatus for reducing the number of channels of a probe unit is provided. An apparatus for testing a liquid crystal display including: a stage on which a liquid crystal panel is placed; a plurality of vertically divided blocks, wherein each of the vertically divided blocks include a plurality of adjacent data lines; a data probe unit that provides test pattern signals respectively to groups of at least two of the plurality of vertically divided blocks of the liquid crystal panel; a plurality of horizontally divided blocks, wherein each of the horizontally divided blocks include a plurality of adjacent gate lines; a gate probe unit that provides scanning signals respectively to the plurality of horizontally divided blocks of the liquid crystal panel; and a controller that provides test pattern signals to the data probe unit and provides scanning signals to the gate probe unit.