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Buffer circuit and source drive circuit with the buffer circuit

A technology of buffering circuits and circuits, which is applied to static indicators, instruments, etc., to achieve the effect of improving the slew rate

Active Publication Date: 2021-01-05
ILI TECHNOLOGY CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the size and resolution of liquid crystal displays increase, the amount of data output by the driving circuit of the liquid crystal display per unit time is also increasing, so the response speed of the operational amplifier, that is, the slew rate (Slew Rate) must also be greatly improved.

Method used

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  • Buffer circuit and source drive circuit with the buffer circuit
  • Buffer circuit and source drive circuit with the buffer circuit
  • Buffer circuit and source drive circuit with the buffer circuit

Examples

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Embodiment Construction

[0065] Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. In addition, wherever possible, elements / components using the same reference numerals in the drawings and embodiments represent the same or similar parts.

[0066] Please also refer to the following figure 1 and figure 2 , figure 1 It is a schematic circuit block diagram of a buffer circuit with enhanced slew rate shown according to an embodiment of the present invention, figure 2It is a schematic circuit structure diagram of a buffer circuit with enhanced slew rate according to an embodiment of the present invention. The buffer circuit 100 may include an operational amplifier 110 and a slew rate enhancement circuit 120 . Operational amplifier 110 may include an input stage 112 , a load stage 114 , and an output stage 116 . The input stage 112 is used for receiving the input voltage signal VI and the output vo...

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Abstract

The invention provides a buffer circuit and a source driving circuit including the same. The buffer circuit includes an operational amplifier and a swing rate reinforcement circuit; the operational amplifier includes an input stage, a load stage, and an output stage; the input stage is used for receiving an input voltage signal and an output voltage signal, and determining a voltage difference between the input voltage signal and the output voltage signal; the load stage is coupled to the input stage to generate a load current corresponding to the voltage difference; and the output stage is coupled to the load stage and generates the output voltage signal. The swing rate reinforcement circuit is coupled to the load stage, and is used for directly supplying the compensation voltage to the load stage or the output stage according to the voltage difference between the input voltage signal and the output voltage signal so as to allow the output stage to react to the compensation voltage to reduce the conversion time of the output voltage signal, and the swing rate of the output voltage signal is effectively improved.

Description

technical field [0001] The invention relates to a display driving device, in particular to a buffer circuit and a source drive circuit with the buffer circuit. Background technique [0002] The operational amplifier is a basic building block of circuits with a wide variety of applications. Circuit designers can often use operational amplifiers to implement many different operational functions. For example, in the driving circuit of the liquid crystal display, the operational amplifier can be used as an output buffer, which can charge and discharge the load (that is, liquid crystal) according to the analog signal output by the previous digital-to-analog converter, so as to drive the liquid crystal on the liquid crystal display. the corresponding pixel unit. However, as the size and resolution of liquid crystal displays increase, the amount of data output by the driving circuit of the liquid crystal display per unit time is also increasing, so the response speed of the opera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/36
CPCG09G3/36G09G3/3696
Inventor 叶松铫
Owner ILI TECHNOLOGY CORPORATION
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