Electro-optical Device Pre-charge Circuit Inspection Integration
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Solution Overview
Problem
In electro-optical devices, the increased number of switches coupled to signal lines complicates the disposal pitch, making it difficult to achieve accurate gradation display due to insufficient writing of video voltage, especially when pre-charge and inspection circuits are not efficiently integrated.
Innovation Solution
An electro-optical device configuration that includes a pre-charge circuit and an inspection circuit disposed on the same side of the display region, with the pre-charge circuit supplying pre-charge signals to signal lines at different timings and the inspection circuit outputting inspection control signals to the pre-charge circuit, using switches and signal selection circuits to manage electrical coupling states based on control signals, thereby reducing the number of switches and improving pitch density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the inspection circuit is independently provided without being used as the pre-charge circuit, then the inspection function can be performed, but the number of switches coupled to the signal line increases, making it difficult to narrow disposal pitches
Solution Approach 1:
The pre-charge circuit is designed to perform dual functions: it serves as both a pre-charge circuit for charging signal lines and an inspection circuit for inspecting signal line states. By making the pre-charge circuit universal, the patent eliminates the need for a separate inspection circuit, thereby reducing the number of switches coupled to signal lines and enabling narrower disposal pitches while maintaining both pre-charge and inspection functionalities
2Adaptability or versatility
If multiple switches are coupled to the signal line for pre-charge and inspection, then both functions can be performed, but the disposal pitch becomes difficult to narrow
Solution Approach 1:
The patent merges the pre-charge circuit and inspection circuit into a single integrated circuit. The pre-charge circuit includes switching elements that can be controlled to perform either pre-charge operations or inspection operations, depending on the control signals applied. This consolidation reduces the total number of switches needed and decreases the disposal pitch between components
3Reliability
If pre-charge is performed for all signal lines simultaneously, then writing insufficiency can be prevented, but the circuit complexity increases
Solution Approach 1:
The patent segments the signal lines into multiple groups and performs pre-charge operations on different groups at different timings within the same horizontal scanning period. This segmented approach allows simultaneous pre-charge for multiple signal lines without requiring a single complex control mechanism, as each group can be independently controlled. The segmentation maintains reliable writing accuracy while reducing overall circuit complexity
Data Source
AI summary
An electro-optical device includes a pre-charge circuit configured to supply a pre-charge signal to a first and second signal line at different timings based on a pre-charge control signal, and an inspection circuit configured to output, to the pre-charge circuit, an inspection control signal indicating whether a target is to be inspected in an inspection operation. The pre-charge circuit includes a first switch, an electrical coupling state between the first signal line and a pre-charge power supply line based on a first coupling control signal, a second switch, an electrical coupling state between the second signal line and the pre-charge power supply line based on a second coupling control signal, a first signal to output the first coupling control signal to the first switch, and a second signal to output the second coupling control signal to the second switch based on the inspection control signal and the pre-charge control signal.