TW202326250A - Display device - Google Patents
Display device Download PDFInfo
- Publication number
- TW202326250A TW202326250A TW110147930A TW110147930A TW202326250A TW 202326250 A TW202326250 A TW 202326250A TW 110147930 A TW110147930 A TW 110147930A TW 110147930 A TW110147930 A TW 110147930A TW 202326250 A TW202326250 A TW 202326250A
- Authority
- TW
- Taiwan
- Prior art keywords
- display device
- layer
- liquid crystal
- phase delay
- sub
- Prior art date
Links
Images
Landscapes
- Liquid Crystal (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Measuring Pulse, Heart Rate, Blood Pressure Or Blood Flow (AREA)
- Vehicle Body Suspensions (AREA)
Abstract
Description
本發明是有關於一種光學裝置,且特別是有關於一種顯示裝置。The present invention relates to an optical device, and in particular to a display device.
膽固醇液晶是具有雙穩態以及反射特性的顯示介質,其可以藉由例如在向列型液晶中添加旋光劑(Chiral Dopant)來形成。然而,由於膽固醇液晶的特殊螺旋結構選擇性的讓不同偏振態的入射光穿透與反射(例如:左旋圓偏光反射且右旋圓偏光穿透,或右旋圓偏光反射且左旋圓偏光穿透),僅有最多50%的光的偏振態符合反射條件。現行膽固醇液晶顯示裝置的最高反射率僅落在29%至32%的範圍內。因此,亟需發展一種提高膽固醇液晶顯示裝置的反射率以及對比度的技術。Cholesteric liquid crystals are display media with bistable and reflective properties, which can be formed by, for example, adding a chiral dopant to nematic liquid crystals. However, due to the special helical structure of cholesteric liquid crystals, incident light of different polarization states is selectively transmitted and reflected (for example: left-handed circularly polarized light is reflected and right-handed circularly polarized light is transmitted, or right-handed circularly polarized light is reflected and left-handed circularly polarized light is transmitted through ), only up to 50% of the polarization states of the light meet the reflection conditions. The highest reflectance of current cholesteric liquid crystal display devices only falls within the range of 29% to 32%. Therefore, there is an urgent need to develop a technology for improving the reflectivity and contrast of the cholesteric liquid crystal display device.
本發明提供一種顯示裝置,具備高的反射率以及對比度。The invention provides a display device with high reflectivity and contrast.
根據本發明一實施例,提供一種顯示裝置,包括相位延遲裝置以及膽固醇液晶層。膽固醇液晶層設置於相位延遲裝置上。當一光束自膽固醇液晶層上入射顯示裝置,膽固醇液晶層反射光束中具有第一偏振態的第一子光束,光束中具有第二偏振態的第二子光束穿透膽固醇液晶層後入射相位延遲裝置並自相位延遲裝置反射,且該相位延遲裝置提供的相位延遲為(m+3/4)×λ,其中m為正整數,λ為該第二子光束的主波長。According to an embodiment of the present invention, a display device is provided, including a phase delay device and a cholesteric liquid crystal layer. The cholesteric liquid crystal layer is disposed on the phase delay device. When a light beam enters the display device from the cholesteric liquid crystal layer, the cholesteric liquid crystal layer reflects the first sub-beam with the first polarization state in the light beam, and the second sub-beam with the second polarization state in the light beam penetrates the cholesteric liquid crystal layer and then enters the phase retardation The device is reflected from the phase delay device, and the phase delay provided by the phase delay device is (m+3/4)×λ, wherein m is a positive integer, and λ is the main wavelength of the second sub-beam.
基於上述,本發明實施例提供的顯示裝置利用相位延遲裝置,對於穿透膽固醇液晶層的光束進行反射,並改變光束的相位,使其能夠反向穿透膽固醇液晶層,藉此提高顯示裝置的反射率及對比度。Based on the above, the display device provided by the embodiment of the present invention uses a phase delay device to reflect the light beam that penetrates the cholesteric liquid crystal layer, and changes the phase of the light beam so that it can reversely penetrate the cholesteric liquid crystal layer, thereby improving the performance of the display device. reflectivity and contrast.
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。In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail together with the accompanying drawings.
參照圖1,顯示裝置1包括相位延遲裝置100以及膽固醇液晶層200。膽固醇液晶層200設置於相位延遲裝置100上。光束W自顯示裝置1外部入射顯示裝置1,光束W包括第一子光束S1及第二子光束S2,兩者偏振態不同。在本實施例中,第一子光束S1的偏振態為左旋,第二子光束S2的偏振態為右旋,膽固醇液晶層200被設置以反射左旋圓偏光,且右旋圓偏光得以穿透膽固醇液晶層200,但是本發明不以此為限。在其他實施例中,第一子光束S1的偏振態為右旋,第二子光束S2的偏振態為左旋,膽固醇液晶層200被設置以反射右旋圓偏光,且左旋圓偏光得以穿透膽固醇液晶層200。Referring to FIG. 1 , a
膽固醇液晶層200包括第一子層201、第二子層202以及第三子層203,其中第一子層201被設置以反射第一子光束S1中的第一色光S11,第二子層202被設置以反射第一子光束S1中的第二色光S12,第三子層203被設置以反射第一子光束S1中的第三色光S13。換言之,第一子光束S1中具有不同波長的部分分別在膽固醇液晶層200的不同位置處被反射。The cholesteric
根據本發明一實施例,第一色光S11、第二色光S12以及第三色光S13分別是藍色、綠色及紅色,但是本發明不以此為限。在其他實施例中,可以透過改變上述各子層中膽固醇液晶的螺距來改變各色光的顏色。According to an embodiment of the present invention, the first color light S11 , the second color light S12 and the third color light S13 are blue, green and red respectively, but the present invention is not limited thereto. In other embodiments, the color of each color light can be changed by changing the helical pitch of the cholesteric liquid crystals in each sub-layer.
對應地,穿透膽固醇液晶層200的第二子光束S2具有第一色光S21、第二色光S22以及第三色光S23,且第一色光S21的波長與第一色光S11的波長相同,第二色光S22的波長與第二色光S12的波長相同,且第三色光S23的波長與第三色光S13的波長相同。Correspondingly, the second sub-beam S2 penetrating the cholesteric
本發明實施例的相位延遲裝置100被設置以提供(m+3/4) ×λ的相位延遲,其中m為正整數,λ為第二子光束S2的主波長。主波長λ可以指具備一定頻寬的波長範圍。The
由於穿透膽固醇液晶層200第二子光束S2為右旋圓偏光,在其入射相位延遲裝置100前,具備主波長的子光束的兩個振動方向互相垂直的電場之間的相位差為(n+1/4)×λ,其中n為正整數。當第二子光束S2入射相位延遲裝置100並自相位延遲裝置100反射(第二子光束S2朝下透射相位延遲裝置100一次,再朝上透射相位延遲裝置100一次),具備主波長的子光束的兩個振動方向互相垂直的電場之間的相位差可以下列關係式來表示:
(n+1/4)×λ + 2×(m+3/4)×λ + λ/2 = (k+1/4)×λ;
其中k = n+2m+2
Because the second sub-beam S2 that penetrates the cholesteric
在上述的關係式中,2×(m+3/4)×λ係來自於透射相位延遲裝置100兩次所造成的相位延遲,λ/2係來自於反射所造成的相位延遲。可以看到,當第二子光束S2入射相位延遲裝置100並自相位延遲裝置100反射,具備主波長的子光束為右旋圓偏光,因此可以朝上穿透膽固醇液晶層200,射出顯示裝置1,提高顯示裝置1的亮度。In the above relational formula, 2×(m+3/4)×λ comes from the phase delay caused by the transmission
根據一未繪示的比較例,當顯示裝置不包括上述的相位延遲裝置100,且光束W自顯示裝置外部入射,光束W中的第一子光束S1被膽固醇液晶層200反射,顯示裝置的最大反射率約為30%。相對地,在圖1所示的實施例中,光束W中的第一子光束S1被膽固醇液晶層200反射,且光束W中的第二子光束S2得以朝上穿透膽固醇液晶層200而射出顯示裝置1,使得圖1所示的顯示裝置1的最大反射率達到約55%,大幅增加了顯示裝置1的反射率。相較於上述的比較例(最大反射率30%),圖1所示的顯示裝置1的對比提高為1.83倍。According to a comparative example not shown, when the display device does not include the above-mentioned
在本發明一實施例中,相位延遲裝置100包括第一相位延遲層101以及第二相位延遲層102,其中第一相位延遲層101設置於膽固醇液晶層200以及第二相位延遲層102之間。在一實施例中,第一相位延遲層101是對應主波長λ的1/4波片,第二相位延遲層102包括可調式相位延遲層。當第一相位延遲層101是對應主波長λ的1/4波片,具備主波長的子光束在第一相位延遲層101以及第二相位延遲層102之間時的偏振態為線性偏振,其兩個振動方向互相垂直的電場之間的相位差為n×λ或(n+1/2)×λ。In an embodiment of the present invention, the
具體而言,藉由控制可調式相位延遲層的相位延遲量,可以改變第二子光束S2射出顯示裝置1的強度。在一實施例中,第二相位延遲層102為一液晶調控式相位延遲層,藉由電壓控制液晶分子的定向來調控第二相位延遲層102提供的相位延遲量,其中液晶分子可以是染料液晶、向列型液晶、層列型液晶、盤狀液晶或網狀液晶中的至少一者。Specifically, by controlling the phase delay of the adjustable phase delay layer, the intensity of the second sub-beam S2 exiting the
在本實施例中,顯示裝置1還包括吸光層300,相位延遲裝置100設置於吸光層300以及膽固醇液晶層200之間,吸光層300可以包括染料液晶。In this embodiment, the
在本發明一實施例中,第二子光束S2在第二相位延遲層102部分反射,且第二子光束S2部分穿透第二相位延遲層102。例如,第二相位延遲層102可以包括半穿反偏光片以及液晶層,液晶層設置於半穿反偏光片與第一相位延遲層101之間。利用液晶層提供相位延遲,使得向下穿透該液晶層的第二子光束S2的偏振方向部分平行半穿反偏光片的反射軸,部分平行半穿反偏光片的穿透軸,達到部分穿透第二相位延遲層102且部分自第二相位延遲層102反射的效果。穿透第二相位延遲層102的第二子光束S2受到吸收層300的吸收。具體而言,藉由調控第二相位延遲層102的穿透率及反射率,可以改變朝上穿透膽固醇液晶層200而射出顯示裝置1的第二子光束S2的強度,以達到預定的反射率及對比度。In an embodiment of the present invention, the second sub-beam S2 is partially reflected by the second
為了充分說明本發明的各種實施態樣,將在下文描述本發明的其他實施例。在此必須說明的是,下述實施例沿用前述實施例的元件標號與部分內容,其中採用相同的標號來表示相同或近似的元件,並且省略了相同技術內容的說明。關於省略部分的說明可參考前述實施例,下述實施例不再重複贅述。In order to fully illustrate various implementation aspects of the present invention, other embodiments of the present invention will be described below. It must be noted here that the following embodiments use the component numbers and part of the content of the previous embodiments, wherein the same numbers are used to denote the same or similar components, and descriptions of the same technical content are omitted. For the description of omitted parts, reference may be made to the foregoing embodiments, and the following embodiments will not be repeated.
參照圖2,顯示裝置2包括相位延遲裝置100A、膽固醇液晶層200以及吸收層300。膽固醇液晶層200中的第一子層201被夾設於玻璃基板G11及G12之間,第二子層202被夾設於玻璃基板G21及G22之間,第三子層203被夾設於玻璃基板G31及G32之間。Referring to FIG. 2 , the
相位延遲裝置100A包括第一相位延遲層101及第二相位延遲層112。與圖1所示實施例中的第二相位延遲層102不同,第二相位延遲層112還包括多個像素以及可調式相位延遲層,且可調式相位延遲層在不同像素中被獨立地控制。在這樣的情況下,不同的像素可以提供不同的相位延遲,使得射出顯示裝置2的第二子光束S2的強度可以隨像素而不同。The
在本實施例中,由於像素的開口率會影響射出顯示裝置1的第二子光束S2的強度,顯示裝置2的最大反射率達到約48.25%,相較於上述的比較例(最大反射率30%),顯示裝置2的對比提高為1.6倍。In this embodiment, since the aperture ratio of the pixel will affect the intensity of the second sub-beam S2 exiting the
參照圖3,顯示裝置3包括相位延遲裝置100A、膽固醇液晶層200以及吸收層300。顯示裝置3與顯示裝置2不同在於,膽固醇液晶層200中的第一子層201被夾設於玻璃基板G11及G12之間,第二子層202被夾設於玻璃基板G12及G31之間,第三子層203被夾設於玻璃基板G31及G32之間。Referring to FIG. 3 , the
綜上所述,本發明提供的顯示裝置利用相位延遲裝置,對於穿透膽固醇液晶層的光束進行反射,並改變光束的相位,使其能夠反向穿透膽固醇液晶層,藉此提高顯示裝置的反射率及對比度。In summary, the display device provided by the present invention uses a phase delay device to reflect the light beam penetrating the cholesteric liquid crystal layer, and change the phase of the light beam so that it can reversely penetrate the cholesteric liquid crystal layer, thereby improving the performance of the display device. reflectivity and contrast.
1、2、3:顯示裝置
100、100A:相位延遲裝置
101:第一相位延遲層
102、112:第二相位延遲層
200:膽固醇液晶層
201:第一子層
202:第二子層
203:第三子層
300:吸光層
G11、G12、G21、G22、G31、G32:玻璃基板
S1:第一子光束
S2:第二子光束
S11、S21:第一色光
S12、S22:第二色光
S13、S23:第三色光
W:光束
1, 2, 3:
圖1是根據本發明一實施例的顯示裝置的示意圖。 圖2是根據本發明一實施例的顯示裝置的示意圖。 圖3是根據本發明一實施例的顯示裝置的示意圖。 FIG. 1 is a schematic diagram of a display device according to an embodiment of the invention. FIG. 2 is a schematic diagram of a display device according to an embodiment of the invention. FIG. 3 is a schematic diagram of a display device according to an embodiment of the invention.
1:顯示裝置 1: Display device
100:相位延遲裝置 100: Phase delay device
101:第一相位延遲層 101: The first phase delay layer
102:第二相位延遲層 102: The second phase delay layer
200:膽固醇液晶層 200: cholesteric liquid crystal layer
201:第一子層 201: The first sublayer
202:第二子層 202: second sublayer
203:第三子層 203: The third sublayer
300:吸光層 300: light absorbing layer
S1:第一子光束 S1: the first sub-beam
S2:第二子光束 S2: Second sub-beam
S11、S21:第一色光 S11, S21: the first color light
S12、S22:第二色光 S12, S22: Second color light
S13、S23:第三色光 S13, S23: third color light
W:光束 W: Beam
Claims (11)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW110147930A TWI806298B (en) | 2021-12-21 | 2021-12-21 | Display device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
TW110147930A TWI806298B (en) | 2021-12-21 | 2021-12-21 | Display device |
Publications (2)
Publication Number | Publication Date |
---|---|
TWI806298B TWI806298B (en) | 2023-06-21 |
TW202326250A true TW202326250A (en) | 2023-07-01 |
Family
ID=87803083
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
TW110147930A TWI806298B (en) | 2021-12-21 | 2021-12-21 | Display device |
Country Status (1)
Country | Link |
---|---|
TW (1) | TWI806298B (en) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10241241B2 (en) * | 2014-10-10 | 2019-03-26 | Nippon Kayaku Kabushiki Kaisha | Light reflecting film, and light controlling film, optical film, functional glass and head-up display including the light reflecting film |
KR101700772B1 (en) * | 2015-10-30 | 2017-01-31 | 엘지디스플레이 주식회사 | Organic light emitting display device |
TWI683162B (en) * | 2018-08-15 | 2020-01-21 | 友達光電股份有限公司 | display system |
CN113167953B (en) * | 2018-11-07 | 2023-10-24 | 瑞尔D斯帕克有限责任公司 | Directional display device |
US20210389513A1 (en) * | 2020-06-12 | 2021-12-16 | Facebook Technologies, Llc | Liquid crystal optical element and fabrication method thereof |
-
2021
- 2021-12-21 TW TW110147930A patent/TWI806298B/en active
Also Published As
Publication number | Publication date |
---|---|
TWI806298B (en) | 2023-06-21 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4415334B2 (en) | Non-absorbing polarization color filter and liquid crystal display device incorporating the same | |
JP4623746B2 (en) | Polarization interference recycling type backlight module and liquid crystal display device incorporating the same | |
US7456915B2 (en) | Liquid crystal display panel with broadband interference polarizers | |
JP2809877B2 (en) | Light control device with liquid crystal | |
KR20050114666A (en) | Birefringent optical element, lcd device with a birefringent optical element, and manufacturing process for a birefringent optical element | |
KR20070118765A (en) | A circular polarizer composite and an optical system comprising the same | |
JP2008512693A (en) | LCD with backlight and reflective polarizer on front panel | |
JP2006113519A (en) | Cholesteric liquid crystal control film | |
JP2002229032A (en) | Reflection type fringe-field switching mode liquid crystal display | |
WO2017179493A1 (en) | Liquid crystal display panel and liquid crystal display device | |
JP2008134579A (en) | Optical filter, polarizing plate, illumination device and liquid crystal display device | |
US20070126963A1 (en) | Transflective liquid crystal display device | |
JP2000122059A (en) | Liquid crystal display element | |
KR100393390B1 (en) | reflective liquid crystal display device | |
KR100699657B1 (en) | A broadband reflection typed brightness enhancement polarizer and a liquid crystal display having the same | |
TWI806298B (en) | Display device | |
US7400370B2 (en) | One pixel full color display device using cholesteric mixture | |
KR20040030874A (en) | Reflective liquid-crystal display | |
CN109856880A (en) | Reflector and driving method, display panel and driving method | |
KR100824115B1 (en) | A reflection typed brightness enhancement polarizer and a liquid crystal display having the same | |
KR101424348B1 (en) | Polarizing element and liquid crystal display device including the same | |
TWI414833B (en) | Low color variation optical devices and backlight modules and liquid crystal displays comprising the optical devices | |
JP2006317940A (en) | Display panel and liquid crystal display | |
KR20190102694A (en) | Polarizing element for organic light emission display devices | |
US11526053B2 (en) | Optical assembly, liquid crystal display device, and electronic equipment |