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Optical structure to reduce internal reflections and method thereof

一种内部反射、光学系统的技术，应用在光学系统领域，能够解决图像降级等问题

Active Publication Date: 2012-05-02
UNIFIED INNOVATIVE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, reflections that occur inside the device, especially at the ITO electrodes and silicon nitride layers, will also cause image degradation in bright rooms

Method used

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  • Optical structure to reduce internal reflections and method thereof
  • Optical structure to reduce internal reflections and method thereof
  • Optical structure to reduce internal reflections and method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0062] refer to figure 1 , describes an example of an optical structure that can be implemented as a liquid crystal display (LCD), where one ITO electrode 102 of n ≈ 1.95 is located between a liquid crystal layer (LC) 104 of n ≈ 1.53 and a glass or color filter (CF) 101 of n ≈ 1.53 and another ITO electrode is located between the LC 104 and the flat resin 108 with n≈1.59. Between the LC and each ITO electrode there is also a thin layer 103 of polyimide (PI) with n≈1.70. Between the silicon dioxide layer 106 of n≈1.55 and / or between the silicon dioxide layer 106 and the planar resin layer, there is also a silicon nitride layer 105 of n≈2.04. The silicon dioxide and silicon nitride layers serve as dielectric and passivation functions in and around the TFT system. Glass 107 supports the structure (another type of support could be eg a polymer (eg a polymer substrate)). This is a typical structure used in the industry and is described in Table 1, along with the thickness of eac...

Embodiment 2

[0077] Silicon dioxide and / or silicon nitride may also be removed from the areas of the LCD through which light is transmitted. This is because they are only necessary around TFTs and circuitry within the device. Light is not transmitted through these areas (light is either reflected by the metal or absorbed in commonly used black shades), so they can be considered irrelevant for the purpose of reducing internal reflections. Silicon dioxide and silicon nitride can in principle be patterned such that they are only found in these opaque areas and not in the transparent parts of the pixels. In this case, the structure is shown in Table 4 and Figure 7 shown.

[0078] The structure described in Table 3 optimizes the thickness of PI and ITO to minimize the total reflectance through destructive interference. The total reflectance of this structure is 0.015; 1.5% of the incident light is reflected by this internal structure.

[0079] Table 4

[0080] Material

Fig...

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Abstract

A structure for reducing internal reflections in an optical system includes a stack of layers including a first layer having a first refractive index, a second layer having a second refractive index, a third layer having a third refractive index, a fourth layer having a fourth refractive index, and a fifth layer having a fifth refractive index. The second layer is arranged between the first layer and the third layer, and the fourth layer is arranged between the third layer and fifth layer. Further, the third refractive index is greater than the second and fourth refractive indexes, the second refractive index is greater than the first refractive index, and the fourth refractive index is greater than the fifth refractive index.

Description

technical field [0001] The present invention relates generally to optical systems, and more particularly to display structures that utilize destructive interference of light to effectively reduce reflections at higher index layers within the optical system. The invention also relates to methods of manufacturing optical structures with reduced internal reflection. Background technique [0002] Many optical systems contain layers with relative refractive indices n. This causes reflections within the system that divert incident light from its designed path, reducing efficiency and increasing noise. In particular, some systems contain a high index medium surrounded by two low index media. In some such systems, the high index medium is thin enough that, depending on the optical path difference, constructive or destructive interference between reflections at the two surfaces of the high index layer may occur. [0003] figure 1 One such system illustrated in is a liquid crystal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09F9/30G02F1/1333G02F1/1335G02F1/1343
CPCB32B7/02G02B1/111C09K19/02Y10T428/24942C09K2323/03C09K2323/00
Inventor 阿利斯代尔·P·科德
Owner UNIFIED INNOVATIVE TECH
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