TWI698663B - 目鏡光學系統 - Google Patents

目鏡光學系統 Download PDF

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TWI698663B
TWI698663B TW108109921A TW108109921A TWI698663B TW I698663 B TWI698663 B TW I698663B TW 108109921 A TW108109921 A TW 108109921A TW 108109921 A TW108109921 A TW 108109921A TW I698663 B TWI698663 B TW I698663B
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liquid crystal
optical system
cholesteric liquid
item
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TW201940927A (zh
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陳宏山
陳明璿
陳建中
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源奇科技股份有限公司
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    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/10—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
    • G02C7/101—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses having an electro-optical light valve
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C7/00—Optical parts
    • G02C7/10—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses
    • G02C7/104—Filters, e.g. for facilitating adaptation of the eyes to the dark; Sunglasses having spectral characteristics for purposes other than sun-protection
    • G—PHYSICS
    • G02—OPTICS
    • G02C—SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES
    • G02C9/00—Attaching auxiliary optical parts
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
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    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G02F1/13471—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells
    • G02F1/13473—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-LC cells for wavelength filtering or for colour display without the use of colour mosaic filters
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    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/13718—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on a change of the texture state of a cholesteric liquid crystal
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1396—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/13363—Birefringent elements, e.g. for optical compensation
    • G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/137—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
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    • G—PHYSICS
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    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
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Abstract

一種目鏡光學系統包括一眼睛佩戴裝置以及一可調光衰減器。可調光衰減器設置在眼睛佩戴裝置所設置的一光路上，並包括多個膽固醇型液晶層、多個電極層以及一控制器。每個膽固醇型液晶層設置在兩個電極層之間。控制器電性連接至這些電極層且用以調整施加至這些電極層的電壓，以在用於具有藍光波段以及紫外波段的至少其中之一的隨機偏振光的至少兩個光衰減階中操作這些膽固醇型液晶層。

Description

目鏡光學系統
本發明是有關於一種光學系統，且特別是有關於一種目鏡光學系統。
隨著顯示技術或光學技術的發展，眼睛佩戴裝置變的多元化。例如，眼睛佩戴裝置可以是眼鏡、護目鏡、虛擬實境（Virtual Reality，VR）顯示器、擴增實境（Augmented Reality，AR）顯示器等。為了防止人眼被藍光損壞，在眼睛佩戴裝置塗覆抗藍光塗層。
然而，在將塗層塗覆在眼睛佩戴裝置之後，抗藍光塗層的透射率不能被調整。強的藍光降低效果容易導致環境影像的顏色失真，但當環境藍光太強時，弱的藍光降低效果容易對人眼沒有保護效果。
因此，使用抗藍光塗層的解決方案不適合用於各種環境或情況，例如，黑暗環境以及具有強藍光或紫外光的環境。
本發明提供一種目鏡光學系統，其能夠在各種環境下實現可調光衰減效果。
根據本發明一實施例，一種目鏡光學系統包括一眼睛佩戴裝置以及一可調光衰減器。可調光衰減器設置在眼睛佩戴裝置所設置的一光路上，並包括多個膽固醇型液晶層、多個電極層以及一控制器。每個膽固醇型液晶層設置在兩個電極層之間。控制器電性連接至這些電極層且用以調整施加至這些電極層的電壓，以在用於具有藍光波段以及紫外波段的至少其中之一的隨機偏振光的至少兩個光衰減階中操作這些膽固醇型液晶層。
在根據本發明實例的目鏡光學系統中，由於膽固醇型液晶層的狀態可經由控制器調整，因此目鏡光學系統能夠在各種環境下實現可調整的藍光或紫外光衰減效果。
為讓本發明的上述特徵和優點能更明顯易懂，下文特舉實施例，並配合所附圖式作詳細說明如下。
圖1A與圖1B分別是根據本發明實施例的兩種操作模式下的一種目鏡光學系統的示意性的剖面圖。請參照圖1A與圖1B，本實施例的目鏡光學系統100包括一眼睛佩戴裝置110以及一可調光衰減器200。眼睛佩戴裝置110例如是虛擬實境顯示器、擴增實境顯示器、護目鏡、眼鏡或其他眼睛佩戴裝置。可調光衰減器200設置在眼睛佩戴裝置110所設置的一光路60上，且其包括多個膽固醇型液晶層210（例如膽固醇型液晶層210a與210b）、多個電極層220（例如電極層220a、220b、220c與220d）以及一控制器230。每個膽固醇型液晶層210設置在兩個電極層220之間。例如，膽固醇型液晶層210a設置在電極層220a與電極層220b之間，且膽固醇型液晶層210b設置在電極層220c與電極層220d之間。
在本實施例中，可調光衰減器200更包括多個基板240（例如基板240a、240b、240c與240d），其中這些電極層220分別設置在這些基板240上。在本實施例中，電極層220a、220b、220c與220d分別設置在基板240a、240b、240c與240d上。
在本實施例中，每個膽固醇型液晶層210包括不含聚合物的手性向列型液晶。手性向列型液晶可包括摻雜有手性摻雜物的向列型液晶。電極層220可以是由例如氧化銦錫或具有良好導電性的任何其他金屬氧化物製成的透明導電層。基板240可以是透明基板，例如玻璃基板或塑膠基板。基板240a與240b、電極層220a與220b以及膽固醇型液晶層210a可形成一液晶單元202，例如，液晶單元202a。基板240c與240d、電極層220c與220d以及膽固醇型液晶層210b可形成一液晶單元202，例如，液晶單元202b。在本實施例中，可調光衰減器200包括兩個液晶單元202。然而，在其他實施例中，可調光衰減器200可包括三個或更多個液晶單元202。
控制器230電性連接至這些電極層220且用以調整施加至這些電極層220的電壓，以在用於具有藍光波段以及紫外波段的至少其中之一的隨機偏振光的至少兩個光衰減階中操作這些膽固醇型液晶層210。例如，當電極層220a與220b之間以及電極層220c與220d之間沒有電壓差時，膽固醇型液晶層210中的液晶如圖1A所示呈螺旋狀排列。經由膽固醇型液晶的螺旋節距的設計，決定了膽固醇型液晶層210的反射光譜。在本實施例中，膽固醇型液晶層210中的膽固醇型液晶的螺旋節距被設計為使膽固醇型液晶層210能夠反射藍光以及紫外光的至少其中之一的一特定值。當電極層220a與220b之間以及電極層220c與220d之間存在電壓差時，膽固醇型液晶層210中的膽固醇型液晶垂直豎立，使得藍光以及紫外光可穿透膽固醇型液晶層210。因此，本實施例的目鏡光學系統100能夠在各種環境下實現可調整的藍光或紫外光衰減效果。
在本實施例中，膽固醇型液晶層210具有右手手性C1以及左手手性C2。例如，膽固醇型液晶層210a具有右手手性C1以反射具有藍光波段以及紫外波段的至少其中之一的右手旋轉光（即右旋圓偏振光），且膽固醇型液晶層210b具有左手手性C2以反射具有藍光波段以及紫外波段的至少其中之一的左手旋轉光（即左旋圓偏振光），使得整個膽固醇型液晶層210a以及210b可反射具有藍光波段以及紫外波段的至少其中之一的隨機偏振光。然而，在其他實施例中，膽固醇型液晶層210a可具有左手手性C2，且膽固醇型液晶層210b可具有右手手性C1。
在本實施例中，控制器230可通過硬體描述語言（Hardware Description Languages，HDL）或本領域技術人員熟悉的數位電路的任何其他設計方式來設計，並且硬體電路可通過現場可程式閘陣列（Field Programmable Gate Array，FPGA）、複雜可程式邏輯裝置（Complex Programmable Logic Device，CPLD）或專用積體電路（Application-Specific Integrated Circuit，ASIC）而實現。或者，控制器230可以是具有計算能力的處理器。
在本實施例中，眼睛佩戴裝置110設置在可調光衰減器200以及一使用者的眼睛50之間，使得可調光衰減器200可衰減來自環境的藍光或紫外光以保護眼睛50，且光衰減率可根據實際需求調整。此外，由於來自環境的藍光已被濾除以減少光的散射，因此可以增加環境中的物體的影像清晰度，並且經由眼睛佩戴裝置110所提供的虛擬影像以及環境中物體的影像的結合效果在眼睛佩戴裝置110的情況下更好，例如，虛擬實境顯示器或擴增實境顯示器。
圖2是根據本發明另一實施例的一種目鏡光學系統的示意性的剖面圖。請參照圖2，本實施例的目鏡光學系統100a相似於圖1A與圖1B的目鏡光學系統100，且它們之間的差異如下。在本實施例的目鏡光學系統100a中，可調光衰減器200設置在眼睛佩戴裝置110以及眼睛50之間，使得可調光衰減器200可衰減來自環境與眼睛佩戴裝置110的藍光或紫外光，以保護眼睛50。
圖3是根據本發明另一實施例的一種目鏡光學系統的示意性的剖面圖。請參照圖3，本實施例的目鏡光學系統100b相似於圖1A與圖1B的目鏡光學系統100，且它們之間的差異如下。在根據本實施例的目鏡光學系統100b中，可調光衰減器200嵌於眼睛佩戴裝置110中。例如，可調光衰減器200設置在眼睛佩戴裝置110內部的光路中，例如影像光束的光路，以保護眼睛50。
圖4是根據本發明另一實施例的一種可調光衰減器的示意性的剖面圖。請參照圖4，本實施例的可調光衰減器200’相似於圖1A與圖1B的可調光衰減器200，且它們之間的差異如下。在根據本實施例的可調光衰減器200’更包括多個配向層250。配向層250分別設置在電極層220上，且每個膽固醇型液晶層210設置在兩個配向層250之間並與其接觸。液晶的初始取向可以經由配向層250來決定。在本實施例中，配向層250的材料包括較不會吸收藍光或紫外光的氧化矽。
圖5是根據本發明另一實施例的一種液晶單元的示意性的剖面圖。請參照圖5，本實施例的液晶單元202c相似於圖1A與圖1B的液晶單元202，且它們之間的差異如下。在根據本實施例的液晶單元202c中，膽固醇型液晶層210c包括聚合物穩定的手性向列型液晶或具有手性聚合物支架的非手性向列型液晶。例如，膽固醇型液晶層210c包括液晶212以及液晶212中的聚合物214。在膽固醇型液晶層210c包括聚合物穩定的手性向列型液晶的情況下，例如，液晶212是手性向列型液晶。另一方面，在膽固醇型液晶層210c包括具有手性聚合物支架的非手性向列型液晶的情況下，例如，液晶212為非手性向列型液晶，且聚合物214為手性聚合物支架。具有手性聚合物支架的非手性向列型液晶可經由以下步驟製成。首先，在手性向列型液晶中摻雜聚合物，以在手性向列型液晶中形成手性聚合物支架。接著，去除手性向列型液晶，以形成具有孔隙的手性聚合物支架。然後，用非手性向列型液晶填充孔隙，以使具有手性聚合物支架的非手性向列型液晶形成。
圖6是根據本發明另一實施例的一種液晶單元的示意性的剖面圖。請參照圖6，本實施例的液晶單元202d相似於圖1A與圖1B的液晶單元202，且它們之間的差異如下。在圖1A與圖1B的液晶單元202中，每個膽固醇型液晶層210具有恆定的節距；例如，螺旋節距P1相同於螺旋節距P2。然而，在本實施例的圖6的液晶單元202d中，膽固醇型液晶層210d具有從其一側至另一側逐漸增加的節距；例如，螺旋節距P2’大於螺旋節距P1’。在圖1A、圖1B與圖6中，膽固醇型液晶層210、210d示意性地示出具有兩個螺旋週期，但實際上，膽固醇型液晶層210、210d可具有三個或更多個螺旋週期，例如，大約十個螺旋週期。
由於每個螺旋節距對應一種反射光譜，所以具有從其一側至另一側逐漸增加的節距的本實施例的膽固醇型液晶層210d可以擴大反射的波長範圍。
圖7是根據本發明另一實施例的一種可調光衰減器的示意性的剖面圖。請參照圖7，本實施例的可調光衰減器200e相似於圖1A與圖1B的可調光衰減器200，且它們之間的差異如下。在根據本實施例的可調光衰減器200e中，膽固醇型液晶層210（例如，膽固醇型液晶層210a與210b’）具有相同的手性。例如，膽固醇型液晶層210a與210b’都具有右手手性C1。然而，在其他實施例中，膽固醇型液晶層210a與210b’可都具有左手手性C2。再者，在本實施例中，可調光衰減器200e更包括一波片，例如半波片260。波片設置在兩個相鄰的膽固醇型液晶層210a與210b’之間，例如，在兩個相鄰的液晶單元202a與202b’之間。
隨機偏振光可被視為右旋圓偏振光與左旋圓偏振光的組合。右旋圓偏振光可以經由具有右手手性C1的膽固醇型液晶層210a衰減。左旋圓偏振光通過膽固醇型液晶層210a，經由半波片260轉換為右旋圓偏振光，並經由膽固醇型液晶層210b’依序衰減。因此，可以經由可調光衰減器200e來衰減隨機偏振光。可調光衰減器200e可以採用一種膽固醇型液晶以達成反射隨機偏振光的效果，以使可調光衰減器200e的成本降低。
圖8A與圖8B分別是根據本發明另一實施例的兩個操作模式下的一種液晶單元的示意性的剖面圖。請參照圖8A與圖8B，本實施例的液晶單元202f相似於圖1A與圖1B的液晶單元202，且它們之間的差異如下。在根據本實施例的液晶單元202f中，膽固醇型液晶層210f包括添加了添加物216的膽固醇型液晶212，例如，染料分子或奈米粒子，以控制可調光衰減器的透射光譜。添加物216可阻擋一些波長範圍的光或增加光的衰減。添加物216可以是二色性染料，且二色性染料分子的光吸收與二色性染料分子的取向有關。二色性染料分子的取向隨著液晶的旋轉而旋轉，使得具有不同二色性分子的取向的圖8A與圖8B在不同操作模式下的光吸收值是不同的。
圖9A是當兩個液晶單元都開啟時，圖1B的可調光衰減器的透射光譜。圖9B是在圖1A與圖1B的實施例中，當其中一個液晶單元開啟時，可調光衰減器的透射光譜。圖9C是當兩個液晶單元都關閉時，圖1A的可調光衰減器的透射光譜。請參照圖1A、圖1B以及圖9A至圖9C。從圖9A至圖9B，可以知道可調光衰減器200能夠調整短波長光的光衰減。再者，「液晶單元開啟」可意味著兩個電極層220之間存在電壓差，並且「液晶單元關閉」可意味著兩個電極層220之間沒有電壓差。
圖10A是在其膽固醇型液晶層包括具有手性聚合物支架的非手性向列型液晶的情況下，當在圖5的實施例中施加至液晶單元的電壓被調整時，透射光譜示出光衰減的波長範圍被偏移的示意圖。圖10B是在其膽固醇型液晶層包括聚合物穩定的手性向列型液晶的情況下，當在圖5的實施例中施加至液晶單元的電壓被調整時，透射光譜示出光衰減的波長範圍變窄或變寬的示意圖。請參照圖10A，在可調光衰減器使用如圖5所示的液晶單元202c的情況下，其膽固醇型液晶層210c包括具有手性聚合物支架的非手性向列型液晶，當施加至電極層220的電壓被調整時，光衰減的波長範圍被偏移，例如，在圖10A中，從一光譜曲線偏移至另一光譜曲線。請參照圖10B，在可調光衰減器使用如圖5所示的液晶單元202c的情況下，其膽固醇型液晶層210c包括聚合物穩定的手性向列型液晶，當施加至電極層220的電壓被調整時，光衰減的波長範圍變窄或變寬，例如，在圖10B中，從一光譜曲線改變至另一光譜曲線。
綜上所述，在根據本發明實施例的目鏡光學系統中，由於膽固醇型液晶層的狀態可經由控制器調整，因此目鏡光學系統能夠在各種環境下實現可調整的藍光或紫外光衰減效果。
雖然本發明已以實施例揭露如上，然其並非用以限定本發明，任何所屬技術領域中具有通常知識者，在不脫離本發明的精神和範圍內，當可作些許的更動與潤飾，故本發明的保護範圍當視後附的申請專利範圍所界定者為準。
50‧‧‧眼睛 60‧‧‧光路 100、100a、100b‧‧‧目鏡光學系統 110‧‧‧眼睛佩戴裝置 200、200’、200e‧‧‧可調光衰減器 202、202a、202b、202b’、202c、202d、202f‧‧‧液晶單元 210、210a、210b、210b’、210c、210d、210f‧‧‧膽固醇型液晶層 212‧‧‧液晶 214‧‧‧聚合物 216‧‧‧添加物 220、220a、220b、220c、220d‧‧‧電極層 230‧‧‧控制器 240、240a、240b、240c、240d‧‧‧基板 250‧‧‧配向層 260‧‧‧半波片 C1‧‧‧右手手性 C2‧‧‧左手手性 P1、P1’、P2、P2’‧‧‧節距
圖1A與圖1B分別是根據本發明實施例的兩種操作模式下的一種目鏡光學系統的示意性的剖面圖。 圖2是根據本發明另一實施例的一種目鏡光學系統的示意性的剖面圖。 圖3是根據本發明另一實施例的一種目鏡光學系統的示意性的剖面圖。 圖4是根據本發明另一實施例的一種可調光衰減器的示意性的剖面圖。 圖5是根據本發明另一實施例的一種液晶單元的示意性的剖面圖。 圖6是根據本發明另一實施例的一種液晶單元的示意性的剖面圖。 圖7是根據本發明另一實施例的一種可調光衰減器的示意性的剖面圖。 圖8A與圖8B分別是根據本發明另一實施例的兩個操作模式下的一種液晶單元的示意性的剖面圖。 圖9A是當兩個液晶單元都開啟時，圖1B的可調光衰減器的透射光譜。 圖9B是在圖1A與圖1B的實施例中，當其中一個液晶單元開啟時，可調光衰減器的透射光譜。 圖9C是當兩個液晶單元都關閉時，圖1A的可調光衰減器的透射光譜。 圖10A是在其膽固醇型液晶層包括具有手性聚合物支架的非手性向列型液晶的情況下，當在圖5的實施例中施加至液晶單元的電壓被調整時，透射光譜示出光衰減的波長範圍被偏移的示意圖。 圖10B是在其膽固醇型液晶層包括聚合物穩定的手性向列型液晶的情況下，當在圖5的實施例中施加至液晶單元的電壓被調整時，透射光譜示出光衰減的波長範圍變窄或變寬的示意圖。
50‧‧‧眼睛
60‧‧‧光路
100‧‧‧目鏡光學系統
110‧‧‧眼睛佩戴裝置
200‧‧‧可調光衰減器
202、202a、202b‧‧‧液晶單元
210、210a、210b‧‧‧膽固醇型液晶層
220、220a、220b、220c、220d‧‧‧電極層
230‧‧‧控制器
240、240a、240b、240c、240d‧‧‧基板
C1‧‧‧右手手性
C2‧‧‧左手手性
P1、P2‧‧‧節距

Claims (16)

  1. 一種目鏡光學系統，包括： 一眼睛佩戴裝置；以及 一可調光衰減器，設置在該眼睛佩戴裝置所設置的一光路上，該可調光衰減器包括： 多個膽固醇型液晶層； 多個電極層，其中每個膽固醇型液晶層設置在兩個電極層之間；以及 一控制器，電性連接至該些電極層且用以調整施加至該些電極層的電壓，以在用於具有藍光波段以及紫外波段的至少其中之一的隨機偏振光的至少兩個光衰減階中操作該些膽固醇型液晶層。
  2. 如申請專利範圍第1項所述的目鏡光學系統，其中該可調光衰減器更包括： 多個基板，其中該些電極層分別設置在該些基板上。
  3. 如申請專利範圍第1項所述的目鏡光學系統，其中該可調光衰減器更包括： 多個配向層，分別設置在該些電極層上，且每個膽固醇型液晶層設置在兩個配向層之間並與其接觸。
  4. 如申請專利範圍第3項所述的目鏡光學系統，其中該些配向層的材料包括氧化矽。
  5. 如申請專利範圍第1項所述的目鏡光學系統，其中每個膽固醇型液晶層包括不含聚合物的手性向列型液晶、聚合物穩定的手性向列型液晶或具有手性聚合物支架的非手性向列型液晶。
  6. 如申請專利範圍第1項所述的目鏡光學系統，其中每個膽固醇型液晶層具有恆定的節距。
  7. 如申請專利範圍第1項所述的目鏡光學系統，其中每個膽固醇型液晶層具有從其一側至另一側逐漸增加的節距。
  8. 如申請專利範圍第1項所述的目鏡光學系統，其中該些膽固醇型液晶層具有右手手性以及左手手性。
  9. 如申請專利範圍第1項所述的目鏡光學系統，其中該些膽固醇型液晶層具有相同的手性，且該可調光衰減器更包括： 一波片，設置在兩個相鄰的膽固醇型液晶層之間。
  10. 如申請專利範圍第1項所述的目鏡光學系統，其中該些膽固醇型液晶層包括添加染料分子或奈米粒子的膽固醇型液晶，以控制透射光譜。
  11. 如申請專利範圍第1項所述的目鏡光學系統，其中當調整電壓時，光衰減的波長範圍被偏移。
  12. 如申請專利範圍第1項所述的目鏡光學系統，其中當調整電壓時，光衰減的波長範圍變窄或變寬。
  13. 如申請專利範圍第1項所述的目鏡光學系統，其中該眼睛佩戴裝置設置在該可調光衰減器以及一使用者的眼睛之間。
  14. 如申請專利範圍第1項所述的目鏡光學系統，其中該可調光衰減器設置在該眼睛佩戴裝置以及一使用者的眼睛之間。
  15. 如申請專利範圍第1項所述的目鏡光學系統，其中該可調光衰減器嵌於該眼睛佩戴裝置中。
  16. 如申請專利範圍第1項所述的目鏡光學系統，其中該眼睛佩戴裝置為虛擬實境顯示器、擴增實境顯示器、護目鏡或眼鏡。
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