Large-size touch display integrated circuit and operating method thereof

By using a combination of open-drain and heavy-load circuits in large-size touch display integrated circuits and broadcasting the check results via correctness wires, the efficiency problem of starting multiple slave integrated circuits in the SPI architecture is solved, achieving a fast and simple startup process.

CN116339834BActive Publication Date: 2026-07-21HIMAX TECH LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
HIMAX TECH LTD
Filing Date
2022-07-29
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

In large-size touch display integrated circuits, existing technologies struggle to efficiently start multiple slave integrated circuits, especially in SPI architectures, where the master integrated circuit needs to verify that each slave integrated circuit has correctly received the startup code, resulting in excessively long boot times.

Method used

By employing a combination of open-drain and heavy-load circuits, the correctness check results are broadcast to the master integrated circuit via a correctness wire, simplifying the startup process of the slave integrated circuit. The state of the slave integrated circuit is determined by the open-drain signal and the high-impedance state.

Benefits of technology

The main integrated circuit can quickly determine whether multiple slave integrated circuits have correctly received the boot code, reducing boot time and improving boot efficiency.

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    Figure CN116339834B_ABST
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Abstract

The present application provides a large size touch display integrated (LTDI) circuit and an operating method thereof. The LTDI circuit is adapted as a slave integrated circuit of a serial peripheral interface (SPI) architecture. The LTDI circuit comprises an open drain circuit and a reload circuit. An output terminal of the open drain circuit is coupled to a correctness wire outside the LTDI circuit. The correctness wire is also coupled to an input terminal of a master integrated circuit of the SPI architecture, and a potential of the correctness wire is pulled up by a pull-up resistor. The reload circuit is coupled to an input terminal of the open drain circuit. The reload circuit is used to check correctness of a start code from the master integrated circuit to generate a correctness check result. The reload circuit transmits the correctness check result back to the master integrated circuit through the open drain circuit and the correctness wire.
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