WO2021102964A1 - Écran d'affichage, dispositif électroluminescent à montage frontal et procédé de fabrication - Google Patents

Écran d'affichage, dispositif électroluminescent à montage frontal et procédé de fabrication Download PDF

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Publication number
WO2021102964A1
WO2021102964A1 PCT/CN2019/122116 CN2019122116W WO2021102964A1 WO 2021102964 A1 WO2021102964 A1 WO 2021102964A1 CN 2019122116 W CN2019122116 W CN 2019122116W WO 2021102964 A1 WO2021102964 A1 WO 2021102964A1
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WO
WIPO (PCT)
Prior art keywords
light guide
light
material layer
emitting device
film
Prior art date
Application number
PCT/CN2019/122116
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English (en)
Chinese (zh)
Inventor
蒋泽全
Original Assignee
深圳市金泰坦科技有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 深圳市金泰坦科技有限公司 filed Critical 深圳市金泰坦科技有限公司
Priority to PCT/CN2019/122116 priority Critical patent/WO2021102964A1/fr
Publication of WO2021102964A1 publication Critical patent/WO2021102964A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • 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
    • G02F1/1336—Illuminating devices

Definitions

  • This application relates to a display screen, and in particular to a display screen, a front light emitting device and a manufacturing method.
  • the front light-emitting device matched with the liquid crystal display is to place the front light-emitting device on top of the liquid crystal display with reflective effect, that is, in front of the liquid crystal display, instead of the traditional bottom-emitting rear-mounted backlight type liquid crystal display .
  • the traditional light-emitting rear-mounted backlight type LCD display consumes high power and is greatly interfered by external light, especially the brighter the external light, the traditional bottom-emitting rear backlight type LCD display cannot be seen clearly. If you rely completely Increasing the brightness of the backlight to enhance the interference contrast between human vision and external light will cause greater damage to the eyes. At the same time, the traditional bottom-emitting rear-mounted backlight LCD display has low energy consumption, but the backlight itself consumes a lot of energy, and power consumption accounts for most of the power of the display system.
  • LCD manufacturers around the world have developed front-illuminated LCDs, which are fully reflective LCDs or transflective LCDs.
  • LCD manufacturers have only developed LCD screens.
  • the front light-emitting devices that are additionally attached to the LCD screen are lacking in the market, especially the front light-emitting devices that can display color and high pixel resolution. Did not meet market demand.
  • the front light emitting devices currently on the market mainly include the following types:
  • the original rear-mounted light guide plate which is traditionally placed on the bottom-emitting rear-backlit type of liquid crystal display, is placed from the back of the bottom-emitting display in front of the front-emitting display, and then lit to provide brightness.
  • This method has been used in the display industry for decades, but the technology has not been improved, and it has been subject to a big bottleneck:
  • This method uses printing or injection molding methods in the industry, including screen printing, pad printing, laser dots, injection molding, etc., resulting in a large particle size of the optical distribution points on the light guide plate.
  • the degree is even larger than the pixel points of the display.
  • the pixel particle size of the ordinary display screen that can play video is 0.03mm.
  • the optical distribution of the light guide plate in this way is usually not less than about 0.03mm, causing the particles of the light guide plate to cover the display.
  • the display pixels of the screen, the image that the human eye looks like is blurry, in the past few decades, it can only be used in toys, or game consoles, or black and white screens (ink screens often referred to in the display industry) as text displays. Larger pixel particles, such as 0.1mm pixels, are used on low-pixel and low-resolution displays, and cannot be used on products that require sharpness.
  • This method will cause the light of the light source to be directly emitted from the light source position of the light guide plate, resulting in uneven light and dark effects on the display screen. This method will cause a large loss of light emission and waste energy.
  • the overall light efficiency utilization is usually only about 40%.
  • the method of the front light emitting device is a coating method, and the uniformity of the display is improved, but there are also some defects.
  • the coating method is to coat the two sides of a transparent sheet separately. The two sides of the transparent sheet are coated with several layers of film. Usually, about 6 layers of film are coated. The antireflection and reflection effects of several layers of film are used to make the front The light from the light source produces more diffuse reflection inside the front light guide plate, thereby improving the uniformity of the light on the screen.
  • This method is similar to the optical waveguide method, without optical distribution points, and can be used on high-resolution, high-resolution displays.
  • the disadvantage of this method is that the brightness is very low. Although it can be used on high-pixel and high-definition displays, the brightness is too low, resulting in unclear display effects and losing the meaning of high-pixel and high-resolution display. Because there are too many coating layers, each layer of coating will have brightness loss.
  • the front light source shoots into and shoots out the bottom coating twice, and shoots out the upper coating once, resulting in the use of light effects. The rate is only about 40%.
  • natural light natural light enters once and exits once, passing through the upper and lower coating layers twice, resulting in a cumulative light efficiency utilization rate of only about 30%.
  • this coating method can only allow the human eye to look at the display screen close to the vertical direction. If the human eye deviates from the vertical direction of the display screen, the display screen of the display screen will not be seen and the effect of the display screen will be lost.
  • Photolithography method The effect of photolithography method is between the above two types, and there are some defects, especially the high cost.
  • the lithography method is similar to the lithography processing method of the liquid crystal display, which is to make a lithographic pattern on the surface of the transparent sheet, similar to the diffraction method of optical waveguide, using the pattern to adjust the light of the front light guide plate.
  • the use of photolithography is expensive, and it is necessary to use a very expensive light mold like a liquid crystal display.
  • the cost of the mold is dozens or even hundreds of times higher than other types of front light emitting devices.
  • the lithography method must have corresponding processing equipment in order to produce.
  • the price of processing equipment is relatively high in the world.
  • the equipment is often subject to purchase restrictions and it is difficult to purchase, and the delivery time of the equipment is very long.
  • the photolithography method also has the problem of the light efficiency utilization rate of polarized light with a certain viewing angle, and the light efficiency utilization rate is only about 40%.
  • the lithography method cannot do full bonding. If full bonding is done, there will be problems with the light path of the grating, causing a lot of light to be unable to exit the display and enter the human eye, resulting in a light efficiency utilization rate of only about 20%. Therefore, this lithography method has not received much attention in the front-emitting liquid crystal display industry.
  • the application provides a front light emitting device, a display screen with the front light emitting device, and a manufacturing method of the front light emitting device.
  • the present application provides a front light emitting device, including a front assembly.
  • the front assembly includes an outer surface film, a light guide material layer, and a base film that are sequentially attached from the outside to the inside.
  • One of the photo material layer and the base film is provided with a pattern composed of nanoparticles by means of electrophotographic or inkjet printing, and the pattern composed of the nanoparticles is sandwiched between the light guide material layer and the base film ,
  • the nanoparticles include PMMA particles.
  • the present application provides a display screen with a front light-emitting device, including a display screen and the above-mentioned front light-emitting device, and a base film of the front light-emitting device is attached to the display screen.
  • the present application provides a method for manufacturing a front light emitting device, including:
  • An outer surface film is provided on the light guide material layer.
  • the front light emitting device and the manufacturing method provided in the embodiments of the application since one of the light guide material layer and the base film is provided with a pattern composed of nanoparticles by means of electrostatic copying or inkjet printing, transparent nanoparticles are used .
  • PMMA nanoparticles can improve the brightness, and because the size of nanoparticles is much smaller than the pixels of the display screen, the size of the mature nanoparticles in the market is usually only about one-hundredth of the pixels of the high-resolution high-resolution display screen.
  • Adopting the front light emitting device of the present invention can reduce the cost, improve the utilization rate of light efficiency, increase the time of using natural light, thereby saving energy and prolonging the time of protecting eyesight.
  • FIG. 1 is a schematic view of the structure of a front light emitting device in an embodiment of the present application at a viewing angle;
  • FIG. 2 is a schematic diagram of the structure of the front light emitting device in another embodiment of the present application in a viewing angle
  • FIG. 3 is a schematic structural diagram of a front light emitting device without a shading plate in an embodiment of the present application at a viewing angle;
  • FIG. 4 is a schematic diagram of the structure of the front light emitting device in an embodiment of the present application from another viewing angle;
  • FIG. 5 is a schematic diagram of the light path of the display screen in an embodiment of the present application when the external light is sufficient;
  • FIG. 6 is a schematic diagram of the light path of the display screen in an embodiment of the application in the case of insufficient external light
  • FIG. 7 is a flowchart of a method for manufacturing a front light emitting device of this application in an embodiment.
  • the front light emitting device of the present application includes a front assembly 100.
  • the front assembly 100 includes an outer surface film 110, a light guide material layer 120 and a base film 130.
  • the outer surface film 110, the light guide material layer 120 and the base film 130 are arranged in sequence from the outside to the inside.
  • the base film 130 is used for attaching to the display screen, and the outer surface film 110 is a surface layer.
  • One of the light guide material layer 120 and the base film 130 is provided with a pattern composed of nanoparticles 140 by electrostatic copying or inkjet printing, and the pattern composed of the nanoparticles 140 can be used to adjust the uniformity of the light-emitting area.
  • the pattern composed of the nano particles 140 is sandwiched between the light guide material layer 120 and the base film 130. That is, in one embodiment, the light guide material layer 120 is provided with a pattern composed of nanoparticles 140 by electrophotographic or inkjet printing. In another embodiment, the base film 130 is printed by electrophotographic or inkjet printing. The method is provided with a pattern composed of nanoparticles 140.
  • this application can use dry PMMA particles as toner to obtain patterns through electrostatic copying; or this application can use a mixture of PMMA particles and liquid as inks to obtain patterns through inkjet printing.
  • the patterns obtained by inkjet printing can be cured by ultraviolet rays, and the nanoparticles 140 can include PMMA particles or other particles capable of adjusting optical properties.
  • the electrophotographic process uses pure dry powder particles. This process has the following advantages:
  • the electrophotographic process only absorbs the particles that need to be copied, and does not waste nano-materials.
  • the thickness of the copy is very thin, it can be copied on hard products or on flexible products. Each piece needs to be copied. The amount of the copied product is very small, and the raw material cost is very low.
  • the particle distribution pattern required by the xerographic process can be adjusted directly in the computer according to the needs of the effect. Each adjustment does not require additional hardware and software to be reproduced. The overall cost is the lowest, and it is more suitable for mass production.
  • the inkjet printing process uses liquid mixed powder particles. This process has the following advantages:
  • the price is cheap, and the inkjet printing process equipment is easy to buy.
  • the inkjet printing process only prints the graphics that need to be printed, and does not waste nano-materials.
  • the thickness of inkjet printing can be very thin, the amount of ink used for printing is very small, and the cost of raw materials is very low.
  • inkjet printing can work with multiple nozzles, which is completely suitable for mass production.
  • the light guide material layer 120 may include a light guide plate or a light guide film.
  • the outer surface film 110 is pasted on the light guide material layer 120 by glue, or the outer surface film 110 can also be attached to the light guide material layer 120 by hot pressing.
  • the light guide material layer 120 and the base film 110 may be bonded by a bonding glue.
  • a coating layer 150 may be provided between the outer surface film 110 and the light guide material layer 120.
  • the coating layer 150 may include one or more layers of films.
  • the coating layer 150 may include an anti-reflection film, a spectroscopic film, and/or a polarizing film.
  • the antireflection film, spectroscopic film and polarizing film can all be provided with one or more layers.
  • the front light emitting device of the present application may further include a light source assembly 200, which is arranged on the side of the front assembly 100.
  • the light source assembly 200 may include an LED lamp 210, a circuit board 220, and a light shield 230.
  • the LED lamp 220 is electrically connected to the circuit board 220, and the shading plate 230 is used to shield the light emitted by the LED lamp, so that the light emitted by the light source does not leak.
  • the LED lights 210 may be arranged on one or more sides of the four sides of the front assembly 100.
  • the display screen with front light-emitting device of the present application includes a display screen 300 and the front light-emitting device in the first embodiment, wherein the front light-emitting device includes the front assembly 100.
  • the front assembly 100 includes an outer surface film 110, a light guide material layer 120 and a base film 130.
  • the outer surface film 110, the light guide material layer 120 and the base film 130 are arranged in sequence from the outside to the inside.
  • the base film 130 is used for attaching to the display screen, and the outer surface film 110 is a surface layer.
  • One of the light guide material layer 120 and the base film 130 is provided with a pattern composed of nanoparticles 140 by electrostatic copying or inkjet printing, and the pattern composed of the nanoparticles 140 can be used to adjust the uniformity of the light-emitting area.
  • the pattern composed of the nano particles 140 is sandwiched between the light guide material layer 120 and the base film 130. That is, in one embodiment, the light guide material layer 120 is provided with a pattern composed of nanoparticles 140 by electrophotographic or inkjet printing. In another embodiment, the base film 130 is printed by electrophotographic or inkjet printing. The method is provided with a pattern composed of nanoparticles 140.
  • the outer surface film 110, the light guide material layer 120 and the base film 130 are all made of transparent materials.
  • this application can use dry PMMA particles as toner to obtain patterns through electrostatic copying; or this application can use a mixture of PMMA particles and liquid as inks to obtain patterns through inkjet printing.
  • the nanoparticles 140 may include PMMA particles.
  • the light guide material layer 120 may include a light guide plate or a light guide film.
  • the outer surface film 110 is pasted on the light guide material layer 120 by glue, or the outer surface film 110 can also be attached to the light guide material layer 120 by hot pressing.
  • the light guide material layer 120 and the base film 110 may be bonded by a bonding glue.
  • a coating layer 150 may be provided between the outer surface film 110 and the light guide material layer 120.
  • the coating layer 150 may include one or more layers of films.
  • the coating layer 150 may include an anti-reflection film, a spectroscopic film, and/or a polarizing film.
  • the antireflection film, spectroscopic film and polarizing film can all be provided with one or more layers.
  • the front light emitting device of the present application may further include a light source assembly 200, which is arranged on the side of the front assembly 100.
  • the light source assembly 200 may include an LED lamp 210, a circuit board 220, and a light shield 230.
  • the LED lamp 220 is electrically connected to the circuit board 220, and the shading plate 230 is used to shield the light emitted by the LED lamp, so that the light emitted by the light source does not leak.
  • the LED lights 210 may be arranged on one or more sides of the four sides of the front assembly 100.
  • Figure 5 is a schematic diagram of the light path of the display screen of this application under sufficient external light
  • Figure 6 is a schematic diagram of the light path of the display screen of this application under insufficient external light, where 400 is the human eye viewing the display and the direction of the arrow Is the direction of the light.
  • the external natural light enters from the outer surface film and enters the light guide plate.
  • the coating can enhance the incidence of light.
  • the outer surface of different refractive index can be used to increase the incidence.
  • the light inside the light guide plate directly passes through the light guide plate and enters the bottom of the light guide plate. Because the bottom of the light guide plate has transparent nanoparticles, the light can penetrate into the display screen or penetrate the base film to enter the display Screen, the reflective plate that comes with the display will reflect light and pass through the display, so that the display will show a luminous picture.
  • the luminous picture passes through the front light guide plate and the outer surface film, and shoots to the human eye to complete the natural light state. The display effect.
  • the external natural light enters from the outer surface film and enters the light guide plate.
  • the coating can enhance the incidence of light.
  • the outer surface film with different refractive index can be used to increase the incident light.
  • the light inside the light guide plate directly passes through the light guide plate and enters the bottom of the light guide plate. Because the bottom of the light guide plate has transparent nanoparticles, the light can penetrate into the display screen or penetrate the base film to enter the display Screen, the reflective plate of the display screen will reflect light and pass through the display screen, so that the display screen will show a luminous picture.
  • the luminous picture passes through the light guide plate and the outer surface film, and shoots to the human eye to complete the display under natural light. effect.
  • the light source can be LED or other light sources.
  • the light source is placed on the side of the light guide plate, which can be unilateral or multilateral.
  • the light that directly enters the light guide plate will be reflected multiple times inside the light guide plate, and it will become indirect light when it touches the upper and lower planes of the light guide plate.
  • the light guide plate and the outer surface film When there is a coating between the light guide plate and the outer surface film, The indirect light from the light source and the indirect light inside the light guide plate will be reflected and directed to the bottom of the light guide plate.
  • the distribution of particles is sparse, and the area where the light source is weak, the distribution of nanoparticles is dense, so that the uniformity of the light entering the display screen from the overall light guide plate can be adjusted, and the uniform light penetrates into the display screen or penetrates the base film into the display screen.
  • the reflective plate that comes with the screen will reflect light and pass through the display screen, so that the display screen will show a luminous picture.
  • the luminous picture passes through the front light guide plate and the outer surface film and shoots to the human eye to complete the display in the state of the built-in light source. effect.
  • the method for manufacturing a front light emitting device of the present application includes the following steps:
  • Step 702 Print a pattern composed of nanoparticles on one of the light guide material layer and the base film by means of electrostatic copying or inkjet printing.
  • the light guide material layer may include a light guide plate or a light guide film.
  • step 702 may specifically include:
  • Step 704 Use the lamination glue to bond the light guide material layer and the base film together, and the pattern is clamped between the light guide material layer and the base film.
  • Step 706 setting an outer surface film on the light guide material layer.
  • the outer surface film can be pasted on the light guide material layer by glue, or the outer surface film can also be pasted on the light guide material layer by hot pressing.
  • the light guide material layer and the base film can be bonded by laminating glue.
  • a layer of outer surface film is attached to the light guide plate.
  • the outer surface film can be made into a hardened anti-scratch film or an anti-glare film according to the requirements of different products.
  • the method for manufacturing a front light emitting device of the present application may further include the following steps:
  • Step 708 Set up a light source assembly around the light guide material layer.
  • the light source assembly may include an LED lamp, a circuit board, and a shading plate.
  • the LED lamp is electrically connected to the circuit board, and the shading plate is used to shield the light emitted by the LED lamp, so that the light emitted by the light source does not leak.
  • the LED lights can be arranged on one or more sides of the four sides of the front assembly.
  • step 704 and step 706 may further include:
  • Step 705 Coating a film on the surface of the light guide material layer, and the coating includes coating an anti-reflection film, a spectroscopic film, and/or a polarizing film. Further, the antireflection film, the spectroscopic film and the polarizing film can all be provided with one or more layers. The coating layer is specifically arranged between the light guide material layer and the outer surface film.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Planar Illumination Modules (AREA)

Abstract

La présente invention concerne un écran d'affichage (300), un dispositif électroluminescent à montage frontal et un procédé de fabrication. Le dispositif électroluminescent à montage frontal comprend un ensemble à montage frontal (100) qui comprend un film de surface externe (110), une couche de matériau de guidage de lumière (120) et un film de base (130) qui sont collés l'un à l'autre de manière séquentielle de l'extérieur vers l'intérieur. La couche de matériau de guidage de lumière (120) ou le film de base (130) est pourvu-e, au moyen d'une copie électrostatique ou d'une impression à jet d'encre, d'un motif composé de nanoparticules (140). Ce motif composé des nanoparticules (140) est pris en sandwich entre la couche de matériau de guidage de lumière (120) et le film de base (130) et les nanoparticules (140) comprennent des particules de PMMA. L'écran d'affichage (300), le dispositif électroluminescent à montage frontal et le procédé de fabrication utilisent les nanoparticules transparentes (140), telles que des nanoparticules de PMMA, pour améliorer la luminosité ; en outre, puisque la taille des nanoparticules (140) est nettement inférieure à celle des pixels de l'écran d'affichage (300) et, généralement, la taille de nanoparticules matures sur le marché n'étant qu'environ un centième de pixels d'un écran d'affichage haute résolution à grand nombre de pixels, l'utilisation du dispositif électroluminescent à montage frontal peut réduire le coût et augmenter le taux d'utilisation de l'effet lumineux et le temps d'utilisation de la lumière naturelle, ce qui permet d'économiser de l'énergie et de prolonger le temps de protection de la vue.
PCT/CN2019/122116 2019-11-29 2019-11-29 Écran d'affichage, dispositif électroluminescent à montage frontal et procédé de fabrication WO2021102964A1 (fr)

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PCT/CN2019/122116 WO2021102964A1 (fr) 2019-11-29 2019-11-29 Écran d'affichage, dispositif électroluminescent à montage frontal et procédé de fabrication

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PCT/CN2019/122116 WO2021102964A1 (fr) 2019-11-29 2019-11-29 Écran d'affichage, dispositif électroluminescent à montage frontal et procédé de fabrication

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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1584639A (zh) * 2003-08-08 2005-02-23 肖特股份公司 在平面光导上生成散射结构的方法
WO2009145319A1 (fr) * 2008-05-29 2009-12-03 京セラ株式会社 Dispositif de source de lumière et unité d'affichage équipée du dispositif de source de lumière
CN103217848A (zh) * 2010-08-09 2013-07-24 纬创资通股份有限公司 电子纸显示器
CN103499853A (zh) * 2013-09-29 2014-01-08 杭州瑞辉光电科技有限公司 导光板、平面发光装置、液晶显示装置、液晶显示终端设备及导光板的制造方法
CN104235689A (zh) * 2014-09-05 2014-12-24 深圳晶华显示器材有限公司 前置面光源、制作方法及含有该前置面光源的显示装置
US20150103393A1 (en) * 2013-10-14 2015-04-16 E Ink Holdings Inc. Reflective display apparatus and manufacturing method of reflective display apparatus
CN104991304A (zh) * 2015-06-25 2015-10-21 东莞轩朗实业有限公司 导光板、油墨及喷墨打印导光板制作方法

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1584639A (zh) * 2003-08-08 2005-02-23 肖特股份公司 在平面光导上生成散射结构的方法
WO2009145319A1 (fr) * 2008-05-29 2009-12-03 京セラ株式会社 Dispositif de source de lumière et unité d'affichage équipée du dispositif de source de lumière
CN103217848A (zh) * 2010-08-09 2013-07-24 纬创资通股份有限公司 电子纸显示器
CN103499853A (zh) * 2013-09-29 2014-01-08 杭州瑞辉光电科技有限公司 导光板、平面发光装置、液晶显示装置、液晶显示终端设备及导光板的制造方法
US20150103393A1 (en) * 2013-10-14 2015-04-16 E Ink Holdings Inc. Reflective display apparatus and manufacturing method of reflective display apparatus
CN104235689A (zh) * 2014-09-05 2014-12-24 深圳晶华显示器材有限公司 前置面光源、制作方法及含有该前置面光源的显示装置
CN104991304A (zh) * 2015-06-25 2015-10-21 东莞轩朗实业有限公司 导光板、油墨及喷墨打印导光板制作方法

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