Reducing thermal drift phenomenon by temperature detector in display system

Abstract

The invention provides an analog front end device with temperature compensation function. The analog front end device comprises a band-gap voltage reference circuit, a clock generator, a temperature compensation circuit, one to three converting circuits and a synchronous greening circuit. The temperature compensation circuit is used to detect the temperature change of the analog front end device; when the temperature changes, the temperature compensation circuit then dynamically compensates the band-gap voltage reference circuit, the clock generator or the synchronous greening circuit in order to control a thermal drift phenomenon generated by the analog front end device.

Description

technical field [0001] The invention relates to an analog front end device with temperature compensation function to solve the phenomenon of thermal drift (thermal drift) caused by temperature change in the circuit. Background technique [0002] The analog front-end devices of the traditional display system are divided into two categories. The first type is the analog front-end device used by the liquid crystal display controller (liquid crystal display controller) without a decoder (decoder). VGA card) output red (R), green (G), blue (B) three image analog signals. The second type is an analog front-end device used by a video decoder that requires a decoder to receive signals from a tuner or a digital video player (DVD player). The above-mentioned signals are divided into the following three types of signals: the first is the AV terminal signal, which only includes one CVBS signal line; the second is the S-terminal signal, which includes two signal lines of Y (brightness) ...

AI Technical Summary

Problems solved by technology

[0005] Traditionally, many tricks are used to solve the phenomenon of temperature drift in the design of analog circuits, such as generating voltages that do not change with temperature (such as bandgap voltage), currents that do not change with temperature, etc. to reduce the clamper 101 (111, 121 ), the analog-to-digital converter 103 (113, 123), the clock generator 140 and the thermal drift phenomenon of related circuits, however, these methods are not obvious in improving the thermal drift phenomenon, and are quite wasteful of hardware consumption

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