Circuit to prevent black screen of 3D glasses

Abstract

The invention discloses a circuit for preventing blank screen of a pair of three-dimensional (3D) glasses and relates to the technical field of 3D glasses. The circuit comprises a power management switching circuit for supplying power for the 3D glasses, wherein the power management switching circuit comprises a voltage boost converter and a switch chip. The voltage boost converter and an enabling pin EN of the switch chip are electrically connected with a power supply end voltage drain drain (VDD), a current node is arranged between the enabling pin EN and the power supply end VDD and is electrically connected with a collector electrode of an audion Q1, an emitter electrode of the audion Q1 is grounded, and a base electrode of the audion Q1 is electrically connected with one output port SWIM_EN of a microprogrammed control unit (MCU) of the 3D glasses. The voltage boost converter and a switch output pin of the switch chip are electrically connected with a load circuit for driving the 3D glasses. The circuit for preventing the blank screen of the pair of 3D glasses effectively solves the technical problem of the blank screen occurred during shutdown and outage of the 3D glasses.

Description

technical field [0001] The invention relates to the technical field of 3D (ThreeDimensional) glasses, in particular to a circuit for preventing the black screen of the 3D glasses. Background technique [0002] With the continuous development of 3D technology, 3D movies, 3D TV and 3D games have become more and more common in people's lives. 3D images need to be viewed with 3D glasses, which use 3D technology time division technology. The images played by 3D movies or 3D TV are images corresponding to the left eye part and the right eye part respectively. 3D glasses need to receive the signals of 3D movies or 3D TV synchronously, and control the left lens and right lens to work alternately, so that the wearer’s The left eye sees the picture corresponding to the left eye, and the right eye sees the picture corresponding to the right eye, so that the left eye and the right eye see different pictures, creating a three-dimensional feeling in the brain. [0003] The circuit of th...

AI Technical Summary

Problems solved by technology

[0004] The power management switch circuit and the load circuit of the above structure make the 3D glasses black screen phenomenon when it is turned off, and it will last for about 10 seconds. As we all know, the lens of the 3D glasses should be transparent when the power is off. A black screen is an abnormal phenomenon

The main reason for this phenomenon is that the power-off sequence between the MCU and the power management switch circuit is unreasonable, that is, the MCU is powered off first when the power is turned off, while the voltage boost converter and the switch chip MP5410 continue to supply power to the load circuit , so that the load circuit, that is, the positive LCD+ and negative LCD- of the LCD lens (such as figure 2 As shown), there is a pressure difference between them, which makes the 3D glasses appear black screen phenomenon

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