Trimming circuit and chip comprising same, trimming method

By acquiring multiple test voltages in the display driver circuit, calculating the ratio and offset parameters, and using a MOSFET to control the resistance change, precise calibration of the output voltage is achieved. This solves the problem of insufficient circuit adjustment accuracy in existing technologies and meets the accuracy requirements for panel adaptation and changes in working mode.

CN116661541BActive Publication Date: 2026-07-03OLED IC MICROELECTRONICS BEIJING CO LTD
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Patent Information

Application Number
CN202310735927.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-06-20
Publication Date
2026-07-03
Estimated Expiration
2043-06-20

AI Technical Summary

Technical Problem

Existing display driver circuit tuning methods cannot maintain high precision in practical applications, resulting in large errors in output voltage when the panel is adapted and the working mode changes, making it difficult to meet different needs.

Method used

A calibration circuit is adopted to obtain multiple test voltages, calculate the ratio and offset parameters, and use a MOSFET to control the change of resistance to achieve accurate calibration of the output voltage. It includes a ratio adjustment unit and an offset adjustment unit, with a simple structure and no significant increase in circuit area.

Benefits of technology

Accurate voltage calibration was achieved across the entire output range, reducing errors and meeting the accuracy requirements for panel adaptation and changes in operating mode, without increasing circuit area.

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Abstract

This invention discloses a calibration circuit, a chip including the same, and a calibration method. The calibration circuit according to an embodiment of the invention includes an input terminal for receiving a voltage control signal, wherein the voltage control signal is directly or inversely proportional to an ideal output voltage; a sampling unit connected to the output terminal to sample and obtain a test voltage; a first test voltage being a test output voltage corresponding to a first ideal output voltage, and a second test voltage being a test output voltage corresponding to a second ideal output voltage; an arithmetic unit obtaining a proportional deviation parameter based on the first test voltage, the voltage control signal corresponding to the first test voltage, the second test voltage, the voltage control signal corresponding to the second test voltage, and the directly or inversely proportional relationship; and a proportional adjustment unit adjusting the output voltage signal according to the proportional deviation parameter. The calibration circuit and the chip including the same according to an embodiment of the invention can achieve accurate calibration across the entire adjustment range.
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