Method and circuit for dynamically modulating digital brightness of time sequence LCOS minisize projector

Abstract

The invention discloses a method for dynamically modulating digital brightness of a time sequence LCOS minisize projector. The method is implemented by a computer program and comprises the following steps of: (1) converting an analog video signal into a standard digital signal; (2) storing each field complete signal; (3) extracting a brightness signal of the first field signal, calculating and converting the brightness signal into an analog voltage; (4) controlling an LED constant current driver IC by using the analog voltage in the step '(3)' and dynamically modulating a drive current of an LED; (5) extracting the brightness signal of a second field signal and processing the brightness signal of the second field signal according to the method in the steps '(3)' and '(4)'; and the rest can be done in the same manner until all the analog video signals are played. The invention also discloses a circuit adopted by the method. The circuit comprises an A/D conversion circuit, a main control CPU, a frame memory, a digital potentiometer, an LED constant current driver IC, and an LED light source which are connected with one another. According to the method for dynamically modulating the digital brightness of the time sequence LCOS minisize projector and the circuit adopted by the method, dynamic contrast of the projector can be obviously improved.

Description

technical field [0001] The invention relates to an image effect improvement method and circuit of a sequential LCOS micro-projector, in particular to a digital brightness dynamic modulation method and circuit of a sequential LCOS micro-projector, belonging to the production field of projectors. Background technique [0002] LCOS (Liquid Crystal on Silicon) is a new type of reflective micro LCD projection technology, which uses a CMOS integrated circuit chip coated with liquid crystal silicon as the substrate of a reflective LCD. It is polished by advanced technology and plated with aluminum as a reflector to form a CMOS substrate. Then, the CMOS substrate is bonded to the glass substrate containing transparent electrodes, and then injected into the liquid crystal package. [0003] The timing portable LCOS projector has the advantages of small size, high brightness, portability, and extremely rich color performance. As a large-screen display device that can be carried with yo...

AI Technical Summary

Problems solved by technology

[0004] However, due to the characteristics of the liquid crystal display technology itself, the contrast ratio of the existing sequential portable LCOS projectors is generally not high. The shocking effect brought by the scene change obviously reduces the image display effect of the timing portable LCOS projector, which has become a major drawback of large-screen display devices and hinders the wide application of timing portable LCOS projectors.

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