LCOS (Liquid Crystal On Silicon) displayer and electronic equipment

Abstract

The invention provides an LCOS (Liquid Crystal On Silicon) displayer and electronic equipment. A reflecting mirror heap which is originally disposed above a pixel electrode layer is changed to be disposed below the pixel electrode layer, thus, on the one hand, light diffraction caused when the conventional reflecting mirror heap is disposed above the pixel electrode layer can be reduced and a higher reflectivity is implemented; on the other hand, the thickness of a pixel electrode is beneficially reduced, a voltage drop generated by an applied voltage on the reflecting mirror heap can be avoided, the problem that the applied voltage on a liquid crystal layer is reduced by an additional load introduced by the reflecting mirror heap is solved, the high reflectivity of the reflecting mirror heap is beneficially implemented, meanwhile, the liquid crystal layer obtains an accurate voltage to guarantee accurate voltage control of the LCOS displayer; and the product performance is improved and mass production of products with higher reflectivity and performance is facilitated.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to an LCOS display and electronic equipment. Background technique [0002] Liquid Crystal on Silicon (LCOS) display is a reflective liquid crystal display device (LCD), which uses semiconductor silicon crystal technology to control liquid crystal and then "projects" a color picture, with high light utilization efficiency, small size, open High resolution, mature manufacturing technology and other characteristics, it can easily achieve high resolution and full color performance. [0003] Please refer to Figure 1A A typical LCOS display includes: a silicon substrate 100 and a pixel electrode layer 101 (with a plurality of pixel electrodes) located on the silicon substrate 100 in sequence, a first alignment layer 102, a liquid crystal layer (LC) 103, a second Two alignment layers 104 , a transparent conductive layer (ITO) 105 , a glass cover 106 and an anti-reflection ...

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Problems solved by technology

[0005] Normally, the LCOS display can have two modes: "constantly bright mode" and "normally black mode". The incident light is modulated to ensure the incident effect, and when the corresponding driving voltage is applied to the two ends of the liquid crystal layer 103, the displayed image will become darker, and the contrast quality of the displayed image (that is, the ratio of the bright state to the dark state) depends on The size of the effective voltage value actually applied on the liquid crystal layer 103 (that is, the effective voltage drop on the liquid crystal layer 103), so that the liquid crystal layer can obtain an accurate voltage to ensure the precise voltage control of the LCOS display, which is conducive to the improvement of product performance, however ,and Figure 2A The method of increasing the mirror stack as shown, on the contrary, brings an additional load (ie Figure 2B R in 3 and C 3 ), thereby affecting the precise control of the effective voltage drop on the liquid crystal layer 103, that is, affecting the realization of precise voltage control of the LCOS display, which is not conducive to the improvement of product performance

[0006] In addition, in order to improve the contrast of the displayed image, one method is to apply a higher driving voltage to both ends of the liquid crystal layer 103, but due to the limitation of semiconductor design and manufacturing process, the maximum driving voltage applied to the liquid crystal layer 103 is also limited, such as image 3 As shown in the curve in image 3 are shown respectively Figure 1A The relationship between the driving voltage applied on the LCOS display and the density of the liquid crystal layer is shown and Figure 2A The relationship between the driving voltage applied on the LCOS display and the density of the liquid crystal layer is shown. Under this method, a higher driving voltage will generate a larger power consumption, which cannot meet the needs of current low-power consumption products; another The method is to optimize the circuit design to reduce the additional load as much as possible without increasing the driving voltage, so as to increase the effective voltage drop on the liquid crystal layer 103, thereby improving the contrast of the displayed image, however Figure 2A The method of increasing the mirror stack as shown, on the contrary, brings an additional load (ie Figure 2B R in 3 and C 3 ), which has caused the contradiction between the high reflectivity of the mirror stack and the high effective voltage drop of the liquid crystal layer 103, which cannot meet the requirements of higher performance LCOS displays

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