Display Panel Polarity Control Signal Generation via Frequency Calculation
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Solution Overview
Problem
Current display panel driving technologies require numerous data lines for transmitting polarity control signals, leading to increased product defective rates and costs due to complex communication interfaces and large Printed Circuit Boards (PCBs).
Innovation Solution
A method and device that detect and calculate the frequency of data output control signals to generate the polarity control signal, eliminating the need for dedicated data lines between the main control chip and data drive chip by using existing signal frequencies, such as the clock scan signal frequency when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated data lines are used to transmit polarity control signals from the main control chip to the data drive chip, then the polarity control can be reliably implemented, but the number of data lines increases, leading to increased PCB size, product defective rate, and cost
Solution Approach 1:
The existing data lines are made multi-functional by enabling them to transmit both data signals and polarity control signals. The data drive chip is designed to identify and separate the polarity control signal from the data signal based on specific signal characteristics, allowing one line to serve multiple purposes without compromising the reliability of polarity control.
Solution Approach 2:
The transmission functions for data signals and polarity control signals are merged into the same data line. By combining these two signal transmission functions into a single channel, the number of required lines is reduced while maintaining the integrity and reliability of the polarity control through intelligent signal differentiation at the receiving end.
2Ease of operation
If multiple data lines are used for communication interface, then the polarity control signal can be transmitted separately, but the PCB size increases and production cost increases
Solution Approach 1:
The data lines are designed to perform dual functions: transmitting data signals during normal operation and transmitting polarity control signals during polarity switching periods. This multi-functionality eliminates the need for separate dedicated lines for polarity control, thereby reducing the overall PCB area required for signal routing.
Solution Approach 2:
The polarity control signal is transmitted during specific periodic intervals (such as during vertical blanking periods or designated time slots) rather than continuously. This periodic transmission approach allows the same data line to be reused for both data and polarity control signals at different times, reducing the total number of lines and PCB area.
3Measurement precision
If separate data lines are used for polarity control signals, then the control accuracy is maintained, but the product defective rate increases
Solution Approach 1:
The data drive chip acts as an intermediary that receives and processes both data signals and polarity control signals through the same data line. It includes signal identification and separation mechanisms that ensure the polarity control signal is accurately extracted and processed, maintaining control accuracy while using shared transmission lines that improve manufacturing yield.
Data Source
AI summary
Disclosed are a method and a device for driving a display panel, and a display device. The method includes: S200, detecting a frequency of a data output control signal TP1 when data is transmitted for the display panel, recording and storing the frequency as a first frequency F1; S300, judging whether the data output control signal TP1 works in a preset working time; S400, detecting a frequency of the data output control signal when the data output control signal TP1 works in the preset working time, recording and storing the frequency as a second frequency F2; and S600, calculating a frequency of a polarity control signal according to the first frequency F1 and the second frequency F2, and generating the polarity control signal according to the calculated frequency to drive the display panel.