Display Driver Serial Flag Extraction for AC Common Voltage Timing
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Solution Overview
Problem
Conventional CPU interface methods for liquid crystal display devices require an oscillator or special control terminal to generate a timing signal for AC common voltage, which increases the size of the circuit and hinders power efficiency, especially in mobile devices where space and power consumption are critical.
Innovation Solution
A display device with a display driver that extracts flags from serial data transmitted via serial transmission to determine the polarity of the common electrode voltage, allowing direct control of the timing signal generation without an oscillator, and includes flags for indicating image data presence, initialization, and frame start, enabling reduced circuit size and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an oscillator or special control terminal is used to generate a timing signal for AC common voltage, then the timing signal can be generated, but the circuit size increases and power consumption increases
Solution Approach 1:
The patent extracts the timing signal generation function from the traditional oscillator-based system and integrates it into the display driver circuit. The display driver generates the timing signal for AC common voltage directly using its internal circuitry, eliminating the need for separate oscillators or special control terminals, thereby reducing circuit size while maintaining reliable timing signal generation
Solution Approach 2:
The patent merges the timing signal generation function with the display driver circuit. The display driver circuit now performs both display control and timing signal generation for AC common voltage, combining multiple functions into a single integrated circuit block, which reduces the overall circuit size and eliminates external oscillators
2Reliability
If an oscillator or special control terminal is used to generate a timing signal for AC common voltage, then the timing signal can be generated, but power consumption increases
Solution Approach 1:
The patent removes the power-consuming oscillator component from the system and extracts the timing signal generation function to be implemented within the display driver circuit using lower-power digital logic, thereby reducing overall power consumption while maintaining reliable timing signal generation
Solution Approach 2:
The patent replaces the traditional mechanical/electrical oscillator system with a digital logic-based timing signal generation approach within the display driver. This substitution eliminates the need for high-power oscillators and reduces power consumption significantly while maintaining the required timing accuracy
3Area of stationary object
If serial transmission is used to transmit display data, then the number of signal lines is reduced and space is saved, but the complexity of data extraction and flag processing increases
Solution Approach 1:
The patent segments the serial data stream into distinct functional components: flag bits for control information and data bits for image information. The display driver extracts these segments at different timing intervals, allowing efficient processing of serial data while maintaining clear separation between control and data functions, which simplifies the processing logic
Solution Approach 2:
The patent incorporates flag bits in advance within the serial data stream before the actual image data. This preliminary action allows the display driver to identify and process control information (such as AC common voltage timing) before processing the image data, simplifying the overall data extraction process and enabling efficient timing signal generation
Data Source
AI summary
A display device of at least one embodiment of the present invention is a display device of an active matrix type, and includes a display driver supplied with image data included in serial data by serial transmission. The serial data is provided with a first flag for specifying a polarity of voltage of a common electrode. The display driver extracts the first flag from the serial data in accordance with a timing of a serial clock, and performs display in accordance with the image data, while generating the voltage of the common electrode which voltage has the polarity specified by the first flag extracted. This realizes a display device capable of generating a timing signal for AC common voltage, while having a small circuit.