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source driver

A technology of source driver and light-emitting diode, which is applied to instruments, static indicators, etc., and can solve problems such as numerical error and influence offset elimination

Active Publication Date: 2022-07-19
NOVATEK MICROELECTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the defect of a certain (or some) pixel circuit often affects the offset cancellation (offset cancellation) operation, resulting in an error in the value (pixel information) sensed by the next pixel circuit

Method used

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Embodiment Construction

[0040] The term "coupled (or connected)" as used throughout this specification (including the claims) may refer to any direct or indirect means of connection. For example, if it is described in the text that a first device is coupled (or connected) to a second device, it should be interpreted that the first device can be directly connected to the second device, or the first device can be connected to the second device through other devices or be indirectly connected to the second device by some means of connection. Terms such as "first" and "second" mentioned in the full text of the specification (including the claims) of the present application are used to name elements or to distinguish different embodiments or ranges, rather than to limit the number of elements The upper or lower limit of , nor is it intended to limit the order of the elements. In addition, where possible, elements / components / steps using the same reference numerals in the drawings and embodiments represent...

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Abstract

A source driver is used to drive an organic light emitting diode (OLED) display panel. The source driver includes a sensing circuit and an operational amplifier. The sensing circuit is configured to sense pixel information of the OLED pixel circuit through the sensing line of the OLED display panel. The operational amplifier includes an amplifier circuit and at least one switch circuit. The amplifier circuit includes at least one gain circuit. The input terminal of the amplifier circuit is coupled to the output terminal of the sensing circuit. Each of the at least one switch circuit is coupled between a pair of output terminals of a corresponding one of the at least one gain circuit.

Description

technical field [0001] The present invention relates to a display device, and more particularly, to a source driver for driving an organic light-emitting diode (OLED) display panel. Background technique [0002] In the OLED display device, since the thin film transistor (TFT) or the organic light emitting diode (OLED) in the pixel circuit deteriorates with time, the source driver needs to detect and compensate the pixel circuit. Generally speaking, the operational amplifier in the source driver senses the pixel information of the OLED pixel circuit through the sensing line of the OLED display panel, and then the operational amplifier transmits the pixel information to the analog-to-digital converter (analog-to-digital converter). , ADC). An analog-to-digital converter converts this pixel information into digital data. This digital data is transmitted back to a system on chip (SoC). The SoC calculates the compensated driving voltage value according to the digital data and ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3275
CPCG09G3/3275G09G3/3291G09G2310/0291G09G2320/043G09G2320/029G09G2310/0294G09G2330/08
Inventor 周志宪程智修林晋毅
Owner NOVATEK MICROELECTRONICS CORP