Display driving circuit, module and electronic equipment

By using conventional IO port MCU and voltage divider circuit in the display driving circuit of the LCD screen, effective display driving on the LCD screen with a bias ratio of one-third is achieved, solving the problems of high cost and ghosting, and achieving low-cost and efficient display driving.

CN119724122AActive Publication Date: 2025-03-28SHENZHEN F&R ELECTRONICS TECH
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Patent Information

Application Number
CN202411934323.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-26
Publication Date
2025-03-28
Estimated Expiration
2044-12-26

AI Technical Summary

Technical Problem

The existing one-third bias ratio TN LCD screens are difficult to achieve effective display driving through conventional IO port MCUs, resulting in high cost and inconvenient chip selection, and prone to ghosting.

Method used

The MCU with a conventional IO port is used to apply positive and negative alternating alternating levels between the SEG terminal and the COM terminal through the voltage divider circuit and the IO port of the MCU, and drive multiple COM terminals through time-sharing scanning to ensure that the voltage difference between the LCD screen in the display and non-display states is ±VDD and ±1/3VDD, respectively.

Benefits of technology

The effective display driving of the LCD screen with a one-third bias ratio is achieved, which reduces the cost of the MCU, facilitates chip selection and mass production and material preparation, and avoids the occurrence of ghosting.

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Abstract

The invention discloses a display driving circuit, module and electronic equipment, the circuit comprises a voltage division circuit and an MCU, the voltage division circuit comprises a first resistor, a second resistor and a third resistor which are equal in resistance and are sequentially connected in series, and the MCU is provided with a first IO end, a second IO end, a plurality of COM ends and a plurality of SEG ends; the MCU applies positive and negative alternating electric levels between the SEG end and the COM ends by switching high / low electric level output of the first IO end and the second IO end, and drives the COM ends to scan in sequence through time-sharing scanning, so that display driving of the liquid crystal display is achieved. Display driving of the liquid crystal screen with the 1 / 3 bias voltage ratio can be achieved through a conventional MCU, cost is low, and chip type selection and mass production material preparation are facilitated.
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