Power supply disturbance control device of camera module and control method thereof
A power supply interference and control device technology, applied in the field of communication, can solve the problems of obvious load effect, system instability, signal energy loss, etc., and achieve the effect of improving the photographic effect
Active Publication Date: 2018-04-06
HUIZHOU TCL MOBILE COMM CO LTD
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Problems solved by technology
The disadvantage is: the signal in the passband has energy loss, and the load effect is more obvious
If the voltage drops too much, it cannot meet the requirements of the Spec (Standard Performance Evaluation Corporation, system performance evaluation test) for AVDD power supply. At the same time, the more the voltage drops, the more unstable the system will be.
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[0024] The invention provides a power supply interference control device of a camera module and a control method thereof, which can effectively filter out power supply interference, so that the camera module has good performance no matter under normal light or dark light. In order to make the object, technical solution and effect of the present invention more clear and definite, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0025] see figure 2 The power supply interference control device of the camera module of the present invention includes an MCU module, a filter module composed of an adjustable resistor and a first capacitor, the adjustable resistor is connected in series between the AVDD power supply terminal and the camera module, and the first...
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The invention discloses a power supply interference control device for a camera module and a control method thereof. The power supply interference control device comprises an MCU module, and a filter module formed by an adjustable resistor and a first capacitor. The adjustable resistor is serially connected between an AVDD power supply end and the camera module. One end of the first capacitor is connected with the AVDD power supply end and the adjustable resistor, and the other end of the first capacitor is grounded. One end of the MCU module is connected with the camera module, and the other end of the MCU module is connected with the control end of the adjustable resistor. The MCU module can adjust the resistance value of the adjustable resistor according to ambient brightness, power supply interference of the camera module and energy loss of the filter module are reduced, energy loss of the filter module is reduced while power supply interference of the camera is restrained, and the camera effects are enhanced in a dark environment.
Description
technical field [0001] The invention relates to the field of communication technology, in particular to a power supply interference control device of a camera module and a control method thereof. Background technique [0002] The phone's Camera (camera) works in low-light conditions, and streaks often appear. This is because under dark light conditions, the signal amount is small, and the Gain (gain, that is, the magnification factor) is too large, which causes the noise to affect the signal more obviously, and sometimes the noise signal even supersedes the useful signal, making the human eye unable to see the image at all. [0003] At present, the most common factor causing this phenomenon of Camera is power interference, especially the analog power supply AVDD that supplies power to Camera is disturbed. Such as figure 1 As shown, the connection between the Camera module and the BB chip (baseband chip) is through MIPI signals. MIPI mainly has two sets of signals, CLK and ...
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IPC IPC(8): H04N5/232H04N5/217
Inventor 王佳张庆峰
Owner HUIZHOU TCL MOBILE COMM CO LTD