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gain amplifier

A technology of gain amplifier and amplifier, which is applied in the direction of amplifier, amplifier combination, gain control, etc., and can solve problems such as error, internal channel error, mutual interference of gain amplifier channels, etc.

Active Publication Date: 2021-01-12
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The problem with known gain amplifiers is that the channels interfere with each other and produce errors, also known as inter-channel errors.

Method used

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Embodiment Construction

[0018] The technical terms in this specification refer to the common terms in the technical field. If some terms are described or defined in this specification, the explanations or definitions in this specification shall prevail. Various embodiments of the present disclosure respectively have one or more technical features. Under the premise of possible implementation, those skilled in the art can selectively implement some or all of the technical features in any embodiment, or selectively combine some or all of the technical features in these embodiments.

[0019] image 3 A circuit diagram of a gain amplifier 300 according to an embodiment of the present application is shown. The gain amplifier 300 uses a differential voltage input and differential voltage output scheme to cancel common mode noise. The gain amplifier 300 includes an operational amplifier 310 , a plurality of gain amplifier units 320_1 - 320_N, and an operational amplifier reset circuit 330 . The operation...

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Abstract

The invention discloses a gain amplifier used in a sensing circuit to sense the degradation of an organic light-emitting diode panel. The gain amplifier includes: an operating amplifier; and a plurality of gain amplifier units. The gain amplifier units are sequentially coupled to the operational amplifier. Each of these gain amplifier units includes a plurality of capacitors. Each of these capacitors is located between two internal nodes of the gain amplifier unit but is not coupled to a ground node, so that a voltage gain and DC deviation of the gain amplifier are based on the capacitors. It is determined by the capacitance value, but the parasitic capacitance is not considered.

Description

technical field [0001] The present invention relates to a gain amplifier. Background technique [0002] Display panels have been widely used in various electronic devices, such as mobile phones, televisions, personal computers, and the like. One of the common display technologies is, for example, organic light emitting diode (OLED) displays. Traditionally, organic light emitting diode displays may suffer from OLED degradation after long-term use, so image compensation is usually required. [0003] Figure 1A A known display device 100 is shown. The display device 100 includes an OLED panel 110 , a source driver 120 and a system-on-chip (SOC) 130 for image processing, such as a timing controller or an image processor. Figure 1B A diagram showing the pixel circuit P, the data line DL and the sensing line SL of the known OLED panel 110 . The source driver 120 includes: a data driving circuit for generating data voltages capable of driving the OLED panel 110; and a sensing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3208G09G3/00H03F3/68H03G3/30
CPCG09G3/006G09G3/3208H03F3/68H03G3/30G09G2310/0291G09G2320/029G09G2320/043G09G2330/12H03F3/45475H03F2203/45586H03M1/122H03F1/26H03F3/45071H03F2200/228H03F2200/252H03F2200/267H03F2200/471H03F2203/45156H03F2203/45544
Inventor 黄国声
Owner NOVATEK MICROELECTRONICS CORP