Display Driver Circuit Pre-Charging for High Frame Rate
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Solution Overview
Problem
Conventional display driver integrated circuits face limitations in operation speed due to internal analog circuit constraints, which hinder the ability to handle high-resolution and high-frame-rate displays effectively.
Innovation Solution
A display driver circuit design that includes a pre-charging circuit with a first switch circuit, voltage supply circuit, and selection circuit to pre-charge the input terminal of source operation amplifiers, allowing for faster response to data voltages and increased driving speed by reducing the time constant seen by the output of the digital-to-analog converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the operation speed of the display driver integrated circuit is increased to handle high-resolution and high-frame-rate displays, then the charging time requirement on the pixel becomes more severe, but the operation speed is limited by the speed of the internal analog circuit of the chip
Solution Approach 1:
The patent applies preliminary action by introducing a pre-charging circuit that charges the input terminal of the source operation amplifier before the main charging process. This pre-charging stage prepares the input terminal in advance, reducing the charging time requirement during the main operation phase and enabling the display driver to handle high-resolution and high-frame-rate displays effectively
2Productivity
If the operation speed of the display driver integrated circuit is increased, then the driving speed can be improved, but the internal analog circuit speed becomes the limiting factor
Solution Approach 1:
The patent introduces a pre-charging circuit as an intermediary component between the digital-to-analog converter and the source operation amplifier. This intermediary circuit speeds up the charging process by providing a dedicated pre-charging path, thereby improving the driving speed without significantly increasing the complexity of the main internal analog circuit
Data Source
AI summary
A display driver circuit for high resolution and high frame rate and a display device using the same are provided. A display driver circuit for high resolution and high frame rate includes a GAMMA output circuit, multiple digital-to-analog converters (DACs), multiple source operation amplifiers and at least a pre-charging circuit. The GAMMA output circuit outputs multiple grayscales of GAMMA voltages. Each DAC receives the GAMMA voltages and provides an output data voltage according to display data. Input terminals of the source operation amplifiers correspondingly coupled to output terminals of the DACs receive the corresponding output data voltages. The pre-charging circuit coupled between the input terminal of at least one of the source operation amplifiers and the output terminal of at least one of the DACs pre-charges the input terminal of the coupled source operation amplifier, so that an output terminal of the coupled source operation amplifier has fast response to the received output data voltage.