Active matrix driven grating light modulator

Abstract

The invention relates to a grating light modulator, which is driven by an active matrix and consists of a grating light modulator at the upper layer and the active matrix for drive at the lower layer. A scanning signal wire and a data signal wire are respectively connected to the grid and drain of a switching tube in the active matrix, the output end of the active matrix is connected to the bottom electrode of the grating light modulator, the top electrode of grating light modulator is grounded. The output voltage of the active matrix equals the voltage of the grating light modulator. When the scanning signal wire is at high level, the active matrix is started, and the data signal wire updates the output voltage of the active matrix; when the scanning signal wire is at low level, the active matrix is cut off, the output voltage of the matrix remains unchanged. Thus, the control over the move status of the grating light modulator can be realized by controlling the output voltage of the active matrix to be updated or maintained. The grating light modulator can cancel cross effect, improve optical contrast and light utility rate and truly serve for projected display with high definition and high resolution.

Description

technical field [0001] The invention relates to an active matrix driven grating light modulator, more specifically, the invention controls the voltage of the MEMS grating light modulator through the active matrix to realize light modulation. Background technique [0002] With the continuous development and maturity of MEMS (Micro-Electro-Mechanical Systems) technology, a light modulator for projection display based on optical MEMS technology has been proposed. Among these optical modulators, digital micromirror devices (DMDs) and grating light valves (GLVs) are representative. They have been used with great success in commercial applications. [0003] DMD is a modulator composed of millions of deflectable reflective micromirrors manufactured by MEMS technology. The tight gap of the DMD micromirror makes the projected image produce a more detailed and seamless picture. The DMD responds quickly, and the contrast, brightness, and uniformity are all very good. The difference...

AI Technical Summary

Problems solved by technology

[0008] In order to overcome the shortcomings of the passive matrix-driven grating light modulator, such as cross effects, low contrast, and low light utilization, the present invention proposes an active matrix-driven grating light modulator, which consists of the lower active matrix It is composed of the grating light modulator on the upper layer. By controlling the output voltage of the active matrix, the control of the voltage of the grating light modulator can be realized, thereby realizing the modulation of light

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