JP2006058753A - Display device and method for fabricating the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively protect a display panel of a public display device from an external force. <P>SOLUTION: An aspect of the public display device includes a transparent front plate 210, a rear frame 220 and a display panel 230. The rear frame 220 is configured to have a waterproof structure, and the transparent front plate and the rear frame are sealed with a silicone resin interposed therebetween so as to have a waterproof property. A transparent gel-like resin layer 250 is formed between a rear side of the transparent front plate and a front side of the display panel. The transparent gel-like resin layer reduces a stress, which is applied to the display panel by deformation of the transparent front plate. Thus, it is possible to prevent a display state from being changed by an external force when a memory type liquid crystal display device is used. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display device and a manufacturing method thereof.

  With the development of information technology and communication technology, the spread of flat displays such as liquid crystal display devices and organic EL (Electro Luminescence) display devices has been remarkable. Furthermore, display devices represented by these are applied not only to information / communication equipment but also to various products, and the range of application is further expanding. For example, conventional shelf labels, advertisements, timetables, and the like are displayed by printed materials such as paper and resin plates, and when the display contents are changed, work for exchanging the printed materials manually is performed. For this reason, in order to change the display contents, appropriate resources, time, work and cost are required.

  Therefore, a technique for displaying a shelf label, an advertisement, a timetable, and the like using a display device capable of electrically changing display contents has been proposed (see, for example, Patent Document 1). This makes it possible to change the display content quickly and easily. The display device proposed in Patent Document 1 includes a memory-type display element that does not require power to maintain display, a photovoltaic power generator that converts light energy into electrical energy, and power generated by the photovoltaic power generator. A power storage device that stores power, and a control unit that supplies power from the power storage device to the memory display element and changes the display of the display element.

  It is disclosed that the memory-type display element is configured by using cholesteric liquid crystal or chiral nematic liquid crystal (hereinafter, chiral nematic liquid crystal). The chiral nematic liquid crystal can change from a planar state to a focal conic state, and conversely from a focal conic state to a planar state, and both states can be maintained without external energy (ie, power) supply. Adjustment is made so that the wavelength of the corresponding color is selectively reflected in the planar state and the visible light is slightly scattered in the focal conic state. As a result, display can be maintained without power consumption.

  By using a memory display element, power consumption can be extremely reduced. In addition, a photovoltaic power generator is used, and electricity generated by the photovoltaic power generator is stored in a power storage device and used for screen display switching of the display element as necessary. Furthermore, by further providing an information receiver that receives information from the outside, the display can be updated by an external command, and the display information can be transmitted from the outside.

  One form of use of this display device is a price tag for products handled at department stores or the like. Product data (for example, product price, product description) is wirelessly transmitted to a liquid crystal display device from a communication terminal such as a host computer. The liquid crystal display device receives the product data transmitted from the communication terminal by the receiver, and displays (or rewrites) it on the liquid crystal display element based on the received product data. At this time, the electric power necessary for displaying or rewriting the product data can be supplied from the storage battery storing the electricity generated by the solar battery.

In addition, information on arrivals and departures of transportation such as trains, buses, and aircraft, presentation of information necessary for passengers such as delays in departure of trains due to accidents, presentation of necessary information on vehicles in transportation, location of employees ( It has been proposed to apply the above display device to the presentation of a place to go, a meeting place, etc.). Patent Document 2 discloses a technique for turning off or turning on an operation indicator lamp that displays the end of operation at a stop by installing a transmitter in a vehicle that is finally driven, such as a final bus or a final train.
JP 2001-184033 A JP-A-48-0669499

  When a display device is used for public display in stores, hotels, transportation facilities, etc., a housing structure that accommodates the display panel is important. Since public display devices are used by an unspecified number of people or are often installed under environmentally harsh conditions, the housing that houses the display panel is effectively a display panel. It is required to have a structure capable of protecting

  In particular, when a multi-stable memory display element such as a chiral nematic liquid crystal is used, the display state is changed by applying stress to the display element, and the display state after the change is maintained. Therefore, it is important to reduce the stress on the display panel and prevent the display state from changing. For example, when a memory-type display element is applied to a public display device, a structure that reduces stress on the display panel surface applied by external force and effectively prevents a change in display state is required.

On the other hand, an external force applied to the display panel can be a big problem in the manufacturing stage of the display device. For example, a large external force applied to the display panel in the manufacturing process may deform the display panel and cause a failure of the display panel. Alternatively, when the display panel is deformed by an external force applied to the display panel in the manufacturing process and the deformation remains on the display panel, display defects such as display unevenness may be caused after the display device is completed.
Accordingly, an object of the present invention is to effectively protect a display panel in a display device.

  1st aspect of this invention was formed between the display panel provided with the display area which displays an image, the transparent front board arrange | positioned in the front surface of the said display panel, and the said front board and the said display area. A display device comprising a gel-like transparent resin layer is provided. Thereby, the display panel can be effectively protected.

The gel-like transparent resin layer is preferably formed so as to cover substantially the entire display area. Thereby, the influence on the display by a display panel can be prevented more effectively.
The gel-like transparent resin layer preferably has a 1/4 consistency of 5 to 500. As a result, the holding of the display panel can be effectively supported, and the stress on the display panel can be effectively suppressed. Or it is preferable that the said gel-like transparent resin layer is formed with the silicone resin. Alternatively, the gel-like transparent resin layer is preferably formed by curing a two-component liquid resin material injected between the display panel and the front plate. Thereby, the transparent gel-like resin layer which suppresses the stress to a display panel effectively can be formed efficiently.

  The viscosity of the liquid resin material is preferably 100 to 2000 mPaS (25 ° C.). Thereby, injection | pouring of a non-hardened liquid resin material can be made easy, and the transparent gel-like resin layer which suppresses the stress to a display panel effectively can be formed efficiently. The liquid resin material preferably contains a curing retarder. As a result, when the display panel is large and the injection time becomes long, it is possible to effectively suppress the resin curing from proceeding more than necessary and the viscosity of the liquid resin from increasing.

Another aspect of the present invention is formed between a display panel having a display region for displaying an image, a transparent front plate disposed on the front surface of the display panel, the front plate and the display region, Provided is a display device comprising a transparent elastic resin layer for suppressing stress from a front plate to the display panel. Furthermore, the tensile elastic modulus at 25 ° C. of the transparent elastic resin layer is preferably 100 MPa or less. Thereby, the display panel can be effectively protected.
It is preferable that a laminated structure not including an air layer is formed between the display region and the front plate. Thereby, reflection of light by the laminated substrate interface can be effectively suppressed.

The display panel preferably displays an image in a plurality of memory display states.
Thereby, power consumption can be reduced and a display apparatus can be installed in various places. In addition, the structure of the present invention can effectively prevent the memory display state from being changed by an external force.

  The front plate is preferably an inflexible glass plate. Alternatively, the front plate preferably has a curved surface shape. Thereby, it can suppress effectively that the external force applied to the front plate is transmitted to the display panel. The display panel is a liquid crystal display panel, and the transparent resin layer preferably contains an ultraviolet absorber. Thereby, even when the external light required for display observation contains ultraviolet rays, the deterioration of the liquid crystal material can be suppressed.

  Another aspect of the present invention is a method for manufacturing a display device, comprising: a display panel having a display area for displaying an image; and a transparent front plate disposed in front of the display panel, Fixing the front plate with a fixing member, injecting a liquid resin material in a reduced pressure state into a space formed between the display panel and the front plate, curing the liquid resin material, And a step of forming a transparent resin layer between the display panel and the front plate. Thereby, the external force to the display panel in the manufacturing process can be suppressed.

In the step of injecting the liquid resin material, the liquid resin material is preferably injected at a degree of vacuum of 1.33 × 10 ^{4 to} 6.67 × 10 ⁴ Pa. Thereby, bubbles in the liquid resin material can be effectively removed. Alternatively, in the step of injecting the liquid resin material, the liquid resin material is preferably injected in a state where the display panel and the front plate are inclined. Thereby, bubbles in the liquid resin material can be effectively removed. Further, in the step of injecting the liquid resin material, it is preferable that an inclination angle of the display panel and the front plate with respect to the horizontal is changed according to an injection amount of the liquid resin material. Thereby, the bubbles in the liquid resin material can be more effectively removed.

  The display panel and the front plate are fixed by a plurality of fixing members arranged with a gap, and the step of injecting the liquid resin material is a space formed between the display panel and the front plate. It is preferable that the liquid resin material is poured into a space formed between the display panel and the front plate while allowing the liquid resin material to flow out through the gap. Thereby, the stress to the display panel can be suppressed. Furthermore, before the step of injecting the liquid resin material, it is preferable that a frame surrounding the display panel and preventing the liquid material from flowing out is fixed to the front plate. Thereby, the outflow of the liquid resin material can be prevented. Further, before the step of injecting the liquid resin material, a step of fixing the frame surrounding the display panel and having an exhaust port formed to the front plate and injecting the liquid resin material is performed from the exhaust port. It is preferable to reduce the pressure in the frame by exhausting the gas. Alternatively, the liquid resin material is preferably a two-component curable resin that does not contain a solvent. Thereby, a transparent resin layer can be formed effectively.

Another aspect of the present invention is formed between a display panel having a display region for displaying an image, a transparent front plate disposed on the front surface of the display panel, the front plate and the display region, A transparent resin layer that suppresses stress on the display panel; and a plurality of fixing members that are arranged between the display panel and the front plate and fix the display panel and the front plate. The fixing members are disposed with a gap therebetween, and the gap is filled with the transparent resin layer. Thereby, the stress to the display panel can be suppressed.
The transparent resin layer is preferably formed of a gel resin. Thereby, the stress to the display panel can be more effectively suppressed.

  ADVANTAGE OF THE INVENTION According to this invention, the external force to the display panel in a display apparatus can be reduced, and the defect generation of a display panel can be reduced.

  Hereinafter, embodiments to which the present invention can be applied will be described. The following description is to describe the embodiment of the present invention, and the present invention is not limited to the following embodiment.

  FIG. 1 is a plan view showing a display screen of the display device 100 according to the present embodiment. The display device 100 includes a display panel that can electrically change display contents, and the display panel is disposed on the back side of the transparent glass front plate 210. The display device 100 includes one or a plurality of display areas for displaying an image. In the example of FIG. 1, the display device 100 includes two display units of a substantially rectangular upper display unit 101 and a lower display unit 102.

  Each display area is surrounded by a black outer peripheral portion 103, and each display area can independently display various images including the same or different characters, figures, symbols. The display device 100 can include three or more display areas. It is preferable to use a black outer peripheral portion formed by sintering a paste-like ink containing colored ceramic particles by screen printing. Thereby, the deterioration of the outer peripheral part by outdoor use can be prevented. Furthermore, gradation can also be achieved by, for example, making the boundary portion of at least a part of the black outer peripheral portion into a spotted print form. Furthermore, the color of the outer peripheral portion 103 can be a color similar to the display color of the display area other than black, for example, white or gray.

  In the example of FIG. 1, the display device 100 displays an all-time departure timetable. The display device 100 is installed on a wall surface of a stairway entrance of a railway subway, and can present information such as the start / end time corresponding to the route and the destination to the user. Since the display device 100 can easily change the display contents, the display device 100 can efficiently cope with the change of the first and last departure time as compared with the timetable printed on the plastic board.

  As the display device 100, a liquid crystal display panel, an organic EL display panel, an electronic ink display panel, or the like can be used. In particular, a display panel having a memory display mode is preferably used. In the memory display mode, the display panel can hold a display image in a state where the drive voltage is substantially 0 V or without being continuously driven. Accordingly, power consumption is reduced, display using a primary battery or a secondary battery is possible, and a display device with excellent installation properties can be provided. As a power supply means, a primary battery or a secondary battery, or a solar battery can be used in combination. A semi-transparent or partially transparent planar solar cell can be installed in a portion other than the frame on the back surface of the transparent front plate.

  As a display panel having a memory display mode, for example, a chiral nematic liquid crystal display panel, a ferroelectric liquid crystal display panel, an antiferroelectric liquid crystal display panel, an electronic ink display panel, or the like can be used. Among them, a chiral nematic liquid crystal display panel is preferable from the viewpoint of display characteristics and power consumption. In particular, a chiral nematic liquid crystal display panel is suitable as a display device of a corresponding size as in the case of being used for displaying a timetable. The chiral nematic liquid crystal display panel will be described later.

  The application of the display device 100 according to the present embodiment is not limited to the all-time train schedule. Display of timetables at airports, bus stops, and other modes of transportation, display of accident information and weather information, digital signage that can be used for advertisements, display of information and information on events at buildings and hotels, or display prices at shops It can be used for various purposes such as electronic shelf labels. In addition, the above displays can be combined and displayed on one display device.

  FIG. 2 is a configuration diagram schematically showing the display device 100. FIG. 2A is a front view of the display device 100. FIG. 2B is a side view showing a state in which the display device 100 is installed on the wall surface 260. FIG. 2C shows a cross-sectional structure in a portion specified by xx ′ in FIG. In addition, the dimension of each figure is not unified. In FIG. 2, 210 is a transparent front plate, and 220 is a back frame fixed to the back of the transparent front plate. The back frame 220 has a waterproof structure, and the transparent front plate 210 and the back frame 220 are sealed with a silicone resin in order to provide waterproof properties. A structure in which a solar cell is arranged on the upper surface of the back frame 220 can also be adopted. In addition, a control switch having a waterproof treatment on the side surface of 220 or the like can be provided. In that case, it is preferable in terms of security to use a switch with a key.

  Reference numeral 230 denotes a display panel, and a chiral nematic liquid crystal display panel is used as a preferred form. The display device 100 includes two display panels 230, each corresponding to the upper display unit 101 and the lower display unit 102. The display panel 230 is accommodated in the back frame 220. By housing the display panel 230 in the waterproof back frame 220, it can be installed in various places including outdoors. A transparent resin layer 250 is formed between the back surface of the transparent front plate 210 and the front surface of the display panel 230 so as to reduce stress on the display panel 230. The transparent resin layer 250 is formed other than the gap between the back surface of the transparent front plate 210 and the front surface 230 of the display panel, and is formed so as to cover the entire surface of the transparent front plate 210 in the back frame 220. The transparent resin layer 250 will be described in detail later. The transparent front plate 210 and the transparent resin layer 250 can be colorless and transparent or colored and transparent depending on the design of the display device.

  Each display panel 230 includes a display area 231 for displaying an image. Each display panel 230 includes an outer peripheral region 245 outside the display region 231. One display panel can include a plurality of display areas. The display panel 230 includes a display cell for displaying an image and various circuits such as a drive circuit and a control circuit for displaying the image on the display cell. The circuit is mounted on the display cell or on a circuit board different from the display cell.

  The transparent front plate 210 is a substantially rectangular planar body, and jigs 211 for attaching the display device 100 to a wall surface or the like are fixed to each corner. By fixing one end of the jig 211 to the transparent front plate 210 and the other end to the installation surface, the display device 100 can be easily and stably installed at a location desired by the user. By adjusting the jig 211, the back frame 220 and the wall surface 260 are brought into contact with each other, and the periphery of the contact portion is sealed with a silicone sealant or the like, thereby further improving the installation stability. For clarity of explanation, the black outer peripheral portion shown in FIG. 1 is omitted. The black outer peripheral portion can be formed on the back surface of the transparent front plate 210.

  Since the transparent front plate 210 functions as a protective plate for the display panel 230, an inflexible transparent plate is preferably used. A transparent resin such as glass or polycarbonate can be used for the transparent front plate 210, and an appropriate material for the transparent front plate 210 can be selected depending on the installation location and application of the display device 100. From the viewpoint of weight reduction, it is preferable to use a resin. Alternatively, when installing in a public place such as a station premises, it is preferable to use a glass plate that is hard to be scratched on the surface and excellent in strength. The cut surface of the glass is preferably chamfered.

  The display device 100 is configured so that the user can visually recognize from a spatially separated position, and is not assumed to touch the display surface directly. However, it is preferable to use a tempered glass used for a vehicle as a transparent front plate, assuming that an abnormal external mechanical force is applied in a normal environment. Ordinary tempered glass produced by air-cooling tempering or chemical tempering can be applied. Moreover, the glass breakage at the time of breakage can be prevented by using a glass structure in which two sheets of glass are laminated via a resin layer. This laminated glass is difficult to remove from the fixing jig because the front plate is not broken by the sandwiched resin even when the glass is broken, and is preferable from the viewpoint of preventing theft.

  The visibility of display can be further improved by forming an antireflection film on the surface side of the transparent front plate 210. As an antireflection film, a thin film of silicate or metal oxide is directly formed on the glass surface by a sputtering method or vapor deposition method with a predetermined film thickness, or a low refractive index resin thin film such as a fluororesin is provided via an adhesive layer or the like. To form the glass surface. In particular, a fluororesin as the outermost layer is preferable because it can impart antifouling performance and easy cleanliness.

  The size of the front plate (flat plate type) in FIG. 2 is, for example, horizontal 564 mm × vertical 256 mm, and the display area of the two display panels near the center is approximately 423 mm × 63 mm. The back frame arranged on the back surface of the front plate constitutes a casing, and the casing has a thickness of about 30 mm. The size of the front plate (curved type) in FIG. 4 is a projection plane in the front direction, 564 mm wide × 398 mm long, and the curve depth from the back side of the front plate to the straight line connecting the ends of the front plate is about 20 mm. .

  The transparent resin layer 250 is not formed so as to cover the entire surface of the transparent front plate 210 in the back frame 220 as shown in FIG. 2, but as shown in FIG. The transparent resin layer 250 may be separately formed between the layers 230. 3A is a front view of the display device 100, and FIG. 3B is a side view showing the state where the display device 100 is installed on the wall surface 260. FIG. FIG. 3C shows a cross-sectional structure in a portion specified by xx ′ in FIG. The same elements as those in FIG. 2 are denoted by the same reference numerals, and the dimensions of the drawings are not unified. The transparent resin layer 250 formed on the back surface of the transparent front plate 210 is spaced apart. In FIG. 3, the transparent resin layer 250 is formed only between the back surface of the transparent front plate 210 and each display panel 230. . The configuration of the display device shown in FIG. 3 is the same as the configuration of the display device shown in FIG. 2 except for the location where the transparent resin layer 250 is formed.

4 and 5 are configuration diagrams schematically showing another preferable configuration of the display device 100. FIG. FIG. 4A is a front view of the display device 100. FIG. 4B is a side view showing a state in which the display device 100 is installed on the wall surface 260. Fig.5 (a) has shown the cross section in the xx 'cut line of Fig.4 (a). FIG. 5B shows another aspect of the cross section taken along the line xx ′ in FIG. The dimensions in each figure do not necessarily match. The same elements as those in FIG. 2 are denoted by the same reference numerals, and description thereof is omitted. The display device 100 of this aspect includes an R-shaped transparent front plate 270.

  As shown in FIG. 5A, the display panel 230 is arranged so that the surface thereof follows the curved surface of the transparent front plate 270. That is, the display panels 230 are arranged such that the surfaces of the display panels are not parallel and the surfaces have a predetermined angle according to the R plane. Thereby, it is possible to prevent the display image from being bent due to the lens effect. As shown in the cross section of FIG. 5A, the two display panels are arranged so as to draw a square shape.

  Further, the transparent resin layer 250 is formed in a space (gap) between the back surface of the transparent front plate 270 and the front surface of the display panel 230 and outside thereof. It is formed so as to cover the entire surface of the transparent front plate 270 in the back frame 220. In addition, the transparent resin layer 250 is partially formed in a space (gap) between the opposing surfaces of the two display panels 230 in the central portion of the transparent front plate 270. Further, as shown in FIG. 5B, the transparent resin layer 250 can be formed in a manner that includes the entire display panel 230 inside the back frame 220. 4 and 5 are the same as those in FIG. Depending on the environment in which the display device of the present invention is installed, the size of each component and the curved surface of the front plate can be set.

  4 and 5 show an example in which the transparent front plate 270 is curved in the longitudinal direction of the surface. Since the transparent front plate 270 has a curved surface shape, the strength against an external force can be increased and the deformation of the transparent front plate 270 can be further reduced. The curved shape of the transparent front plate 270 may be a shape that curves in two or more directions in addition to a curved surface that curves in one direction as shown in FIGS.

  Similar to the display device 100 having the flat transparent front plate 210, in the display device 100 having the R-shaped transparent front plate 270, the transparent resin layer 250 is entirely disposed on the surface of the transparent front plate 270 in the back frame 220. 6, the transparent resin layer 250 can be separately formed between the back surface of the transparent front plate 270 and each display panel 230, as shown in FIG. FIG. 6A is a front view of the display device 100, and FIG. 6B is a side view showing the state where the display device 100 is installed on the wall surface 260. FIG. FIG. 6C shows a cross-sectional structure in a portion specified by xx ′ in FIG.

  In FIG. 6, the same elements as those in FIGS. 4 and 5 are denoted by the same reference numerals, and the dimensions in each figure are not unified. The transparent resin layer 250 formed on the back surface of the transparent front plate 270 is separated. In FIG. 6, the transparent resin layer 250 is formed only between the back surface of the transparent front plate 270 and each display panel 230. The configuration of the display device shown in FIG. 6 is the same as the configuration of the display device shown in FIGS. 4 and 5 except for the place where the transparent resin layer 250 is formed.

  FIG. 7 schematically shows an example of a cross-sectional structure of the chiral nematic liquid crystal display panel 230. The chiral nematic liquid crystal panel 230 has a phase transition type operation, and is stable in at least two phases of a planar state in which a part of incident light is selectively reflected and a focal conic state in which incident light is scattered or transmitted. By applying a predetermined voltage between the electrodes, the liquid crystal can be transferred to the planar state or the focal conic state.

  As shown in FIG. 7, two first and second chiral nematic liquid crystal display cells 232 and 233 having basically the same cell structure are stacked. The first substrate 234 and the second substrate 236 are arranged so that the electrode surfaces of the row electrode 235 formed on the first substrate 234 and the column electrodes 237 formed on the second substrate 236 are orthogonal to each other. The first substrate 234 and the second substrate 236 are fixed to the peripheral sealing material by 238, and a cell space is formed between the two substrates. A chiral nematic liquid crystal layer 239 is sealed inside the cell space. The electrode and the liquid crystal may be in contact with each other through an insulating layer made of a metal oxide film or a resin layer such as polyimide. The chiral nematic liquid crystal panel 230 is preferably driven by a simple matrix method.

  A colored layer 240 made of black matte paint is formed on the back side of the first substrate of the second cell. An adhesive layer 241 is formed between the first cell 232 and the second cell 233. The chiral nematic liquid crystal layer 239 is driven by a voltage applied between the row electrode 235 and the column electrode 237 arranged to face each other, and the transition of the phase state is controlled to perform display. Since the chiral nematic liquid crystal display panel 230 does not use a polarizing plate, bright display with a wide viewing angle can be performed.

  The selective reflection characteristics of the first cell 232 and the second cell 233 are changed to perform different color development, so that a plurality of colors can be displayed. Typically, the dominant wavelength of selective reflection can be adjusted by adjusting the ratio between the chiral agent and the liquid crystal material. The color of the colored layer 240 may be other than black, for example, blue, and two-color display of “white-blue” can be performed together with the orange selective reflection color.

  That is, in combination with the selective reflection characteristic of the chiral nematic liquid crystal display panel, color development can be set according to use. Further, the number of layers of the chiral nematic liquid crystal display panel may be a single layer, or a full-color display can be performed as a three-layer structure. Note that color display by a chiral nematic liquid crystal display panel is disclosed in, for example, Japanese Patent Application Laid-Open No. 2003-315763.

  The chiral nematic liquid crystal display panel 230 exhibits a memory property, and when the voltage is set to a predetermined display state by applying a voltage to the column electrode 237 of the second substrate 236, the display state in the state where the applied voltage is set to 0V. Is maintained. By applying a predetermined signal voltage again, the maintained display state can be transferred to another display state. Typically, the color of selective reflection is displayed by bringing the entire display surface into a planar state, and the surface of the back side is displayed with a matte color (black paint) when the focal conic state is reached.

  As described above, the chiral nematic liquid crystal display panel 230 exhibits a memory property and is stable in a plurality of phase states. For this reason, for example, when stress is applied to the liquid crystal material by pressing the surface of the liquid crystal display panel 230, the phase state of the chiral nematic liquid crystal transitions. The chiral nematic liquid crystal becomes stable in the phase state after the transition, and the state is maintained. Thus, phase transitions due to stress on the liquid crystal layer can cause undesired and undesired changes in the display state. Since this characteristic is the same for many other memory-type display panels, in a display device using the memory-type display panel, a configuration for preventing stress beyond a predetermined value from being applied to the display panel. Is extremely important.

  As shown in FIGS. 2 to 6, the display device 100 of this embodiment includes transparent front plates 210 and 270 that function as protective plates for the chiral nematic liquid crystal display panel 230. Inflexible transparent plates are used as the transparent front plates 210 and 270, and the external force applied to the surface of the display device 100 is prevented from being transmitted to the display panel 230. From the viewpoint of protection from external force, a glass plate of several mm or more is preferably used. A transparent resin layer 250 is formed between the transparent front plates 210 and 270 and the display panel 230. The transparent resin layer 250 effectively reduces the stress generated by an external force after installation of the display device 100 or applied to the display panel 230 due to distortion of the display device 100 due to manufacture and installation, and prevents a change in display state. .

  In order to effectively reduce the stress that can be applied to the display panel 230, the transparent resin layer 250 is formed of a transparent elastic resin. In order to suppress the stress on the display panel 230 as much as possible, the transparent resin layer 250 is preferably formed of a low elastic modulus material. As a transparent resin having a low elastic modulus, the glass transition temperature of the resin is preferably 0 ° C. or lower, more preferably −20 ° C. or lower. Further, the tensile modulus at ordinary temperature (25 ° C.) is 100 MPa or less, more preferably 10 MPa or less. In particular, 1 MPa or less is more preferable.

  Silicone, acrylic, urethane and the like can be considered as the material of the elastic resin, and one of the preferable transparent elastic resin materials is silicone resin. As a preferred example of the silicone resin, two-component thermosetting silicone SE1740 (A / B) manufactured by Toray Dow Corning Silicone Co. can be mentioned. In addition, a resin having a crosslinked molecular structure is preferable from the viewpoint of characteristic stability at high temperatures, but a gel-like transparent resin that can flow slightly can also be used.

  In addition, a particularly preferable material for the transparent resin layer 250 is a transparent gel resin. The gel-like resin is extremely excellent in absorbing stress as compared with a hard elastic resin such as a rubber-like resin. For this reason, for example, the residual stress on the display panel 230 due to the difference in thermal expansion in the heat cycle test or the transparent front plate 210 is deformed by fixing the transparent front plates 210 and 270 to the wall surface 260 with the jig 211. In particular, it is possible to effectively absorb stress and the like, and to suppress display unevenness of the display panel 230 effectively.

  When the transparent gel resin is used, the consistency of the transparent resin layer 250 of the transparent gel resin is set to an appropriate value in order to effectively fix the display panel 230 and the transparent front plates 210 and 270. In particular, in determining the consistency of the gel-like transparent resin layer 250, it is important to consider the suppression of stress to the display panel 230 or the positional deviation of the display panel 230. In order to suppress the stress applied to the display panel 230 as much as possible, it is preferable that the consistency is large. However, if the consistency is too large, the display panel 230 cannot be held, and the display panel is displaced. Therefore, it is preferable that the 1/4 consistency of the gel-like transparent resin layer 250 is 5 to 800 (JIS K2220). More preferably, it is 10-500 (JIS K2220).

  As the material for the gel-like transparent resin layer 250, silicone, acrylic, urethane, and the like can be considered. From the viewpoint of suppressing the generation of bubbles in the manufacturing process, it is preferable to use a silicone resin having a low surface tension. . Moreover, as a preferable example of the gel type silicone resin, two-component type curable silicone which shows a gel state after curing can be mentioned. Since a cured resin layer is formed in a closed space, a two-component curable silicone that does not contain a volatile solvent is preferred instead of a one-component curable resin that contains a volatile solvent. For example, the transparent resin layer 250 can be formed by using two-component thermosetting silicone SE1885 (A / B) manufactured by Toray Dow Corning Silicone. A method for forming the transparent resin layer 250 using the two-component curable silicone will be described later.

  The thickness of the elastic or gel-like transparent resin layer 250 is set to an appropriate value from the viewpoint of structural strength, reduction of stress on the display panel, and the like. For example, in the display device 100 including the transparent front plate 210 of about 4 mm and the display panel 230 of about 4 mm, the transparent resin layer 250 of about 1 mm can be formed. The transparent resin layer 250 can be composed of a single layer or a plurality of layers of two or more layers. Each layer in the transparent resin layer 250 can be formed of the same or appropriately selected different materials.

  An optical member other than the transparent resin layer 250 can be disposed between the display panel 230 and the transparent front plates 210 and 270. However, between the display panel 230 and the transparent front plates 210 and 270, each member is disposed. It is preferable not to form an air layer. As the optical member, a planar UV cut film can be embedded in the transparent resin layer. By laminating the display panel 230 and the transparent front plates 210 and 270 without interposing an air layer, reflection of light due to a change in refractive index between the layers can be suppressed. Thereby, the antireflection process to the front surface of the display panel 230 and the back surface side of the transparent front plate 210 can be made unnecessary. In addition, when the air layer is formed, it is preferable to apply an antireflection treatment to each of the back surface of the transparent front plate and the front surface of the display panel.

  Preferably, the transparent resin layer 250 is in contact with and fixed to the display panel 230 and the transparent front plates 210 and 270 to form respective interfaces. Here, the fixed state includes not only a case where the fixing is substantially impossible to be peeled, but also a case where the fixing is performed so as to be peelable by an external force of a predetermined level or more. From the viewpoint of preventing reflection, the refractive index of the transparent resin layer 250 is preferably approximate to the refractive index of the contact surfaces of the display panel 230 and the transparent front plates 210 and 270.

  The transparent resin layer 250 is preferably formed so as to cover substantially the entire display area of the display panel 230 as shown above. Thereby, application of external force to the entire display area via the transparent front plate can be effectively suppressed, and an undesirable change in display state can be prevented. Further, by covering the entire front surface of the display area with the same material, it is possible to prevent the display state from being different in the display area.

  In the case of using a liquid crystal material for the display panel 230, it is necessary to take into account the deterioration of the liquid crystal material due to ultraviolet rays. In order to effectively cut ultraviolet rays, it is preferable that an ultraviolet absorber is contained in the transparent resin layer 250. It is preferable that the ultraviolet absorber has a sharp ultraviolet blocking property at 400 nm or less. Depending on the type of liquid crystal material used, it is preferable to select the molecular structure and addition amount of the ultraviolet absorbing material so that incident light with a wavelength of 410 nm or less is sharply blocked. Further, incident light having a longer wavelength may be absorbed as long as the display quality of the liquid crystal display panel is not impaired. When the transparent resin layer 250 is formed of a silicone resin, a preferable ultraviolet absorber is a material represented by the following chemical formula. This ultraviolet absorber is soluble in a silicone resin, does not bleed out during low-temperature storage, and can effectively absorb long-wavelength ultraviolet rays.

  Note that the transparent resin layer 250 of this embodiment can be applied not only to a display device using a memory type display panel but also to a display device using another display panel. By reducing the stress applied to the display panel by the transparent resin layer 250, it is possible to prevent a failure of the display panel.

  Next, a method for manufacturing the display device 100 will be described. A method for manufacturing a chiral nematic liquid crystal display panel, which is a preferred embodiment of the display panel 230, will be described as an example. First, two substrates on which a transparent conductive film made of ITO is formed are prepared. The ITO layer of each substrate is subjected to a photo process process and an etching process, and the ITO layer is patterned. The ITO pattern on each substrate to be formed constitutes, for example, a row electrode having a maximum interval of about 10 μm and about 220, and a column electrode having a maximum interval of about 10 μm and about 1440.

  Next, after an electrical insulating layer is formed on the electrode forming surface side of each substrate, a polyimide resin solution is applied to the insulating layer and baked to form an alignment film. As an example, the surface of the alignment film on the insulating layer can be used as it is without being rubbed. Two substrates are arranged so that the respective stripe electrodes are orthogonal to each other, and a spacer having a diameter of about 4 μm is distributed between the opposing surfaces. A peripheral sealing material made of an epoxy resin containing a small amount of glass fiber with a diameter of about 4 μm is applied to the four sides of the substrate except for the portion serving as the liquid crystal injection port, and the two substrates are bonded together to produce a liquid crystal cell.

  Next, a chiral agent is mixed with the nematic liquid crystal material to prepare a chiral nematic liquid crystal composition. The helical pitch can be adjusted by selecting the type of liquid crystal material, the type of chiral agent, and the mixing ratio of both, and by adjusting the refractive index of the liquid crystal to be used, light of selective reflection due to the planar state The wavelength of can be adjusted. After injecting the chiral nematic liquid crystal composition from the injection port into the space between the substrates of the liquid crystal cell using the vacuum injection method, the injection port is sealed with a photocurable resin or a thermosetting resin, and the chiral nematic liquid crystal display cell is formed. To manufacture. Circuits such as a driver circuit and a control circuit are mounted on the chiral nematic liquid crystal display panel.

  A method for fixing the prepared chiral nematic liquid crystal display panel to the transparent front plate 210 will be described. In the following description, an example in which the gel-like transparent resin layer 250 is formed will be described. However, the display panel and the transparent front plate can be fixed using a rubber-like elastic resin according to the following method. FIG. 8 shows an example of a fixing method between the display panel 230 and the transparent front plate 210. FIG. 8A is a plan view showing an example of the fixing method, and FIG. 8B is a cross-sectional view taken along the line AA ′ of FIG. In the following description, the manufacturing method of this aspect is disclosed taking the display device 100 shown in FIG. 3 as an example (showing a step of injecting resin into the upper display panel).

  A double-sided adhesive tape 510 is attached to the display panel 230 or the transparent front plate 210. The tape 510 is attached so as to be finally arranged in the outer peripheral area 245 of the display area 231 of the display panel 230. The wall surface of the double-sided tape 510 in contact with the liquid transparent resin can be coated with another resin that has good wettability with the liquid transparent resin, that is, the contact angle with the liquid resin can be reduced. Generation of small bubbles is preferable. For example, when a silicone resin is selected as the liquid transparent resin, it is preferable to apply a fast-curing silicone resin to a predetermined side surface of the double-sided tape. In this embodiment, a double-sided adhesive tape 510 is attached to the outer peripheral area 245 of each of the two display panels.

  Next, they are aligned and overlapped so that the opening in the black outer peripheral area of the transparent front plate 210 and the display area of the display panel 230 overlap. The tape 510 surrounding the display area is attached so that an opening for injecting the liquid resin and an opening for degassing are formed. The injection opening and the deaeration opening are preferably formed on the same side. The liquid resin is injected from the injection opening of the tape using the injection needle 520, and the deaeration needle 530 is inserted into the deaeration opening to perform deaeration when the liquid resin is injected.

  In order to reduce the stress on the display panel due to strain, it is preferable to select a resin material having a small shrinkage due to curing. Preferably, a two-component type silicone resin is used. Further, as the liquid resin material to be injected, it is preferable to select a liquid resin material having a low viscosity and a small surface tension in order to prevent generation of bubbles, and in particular, the viscosity of the liquid resin material before curing is 2000 mPaS (25 ° C.). The following is preferable. As the two-component mixed type silicone resin, for example, two-component thermosetting silicone SE1885 (A / B) manufactured by Toray Dow Corning Silicone Co., Ltd. can be used. Further, as an ultraviolet absorber mixed in the liquid resin material, an ultraviolet absorber “TINUVIN 109” manufactured by Ciba Specialty Chemicals Co., Ltd., which has Chemical Formula 1 and n = 8 can be used.

Moreover, since gel-like resin has a short pot life (time from 2 liquid mixing to the start of hardening), it is preferable to mix a curing retarder in a liquid resin material. When the display panel 230 is large and the injection time becomes long, it is possible to effectively prevent the resin from curing more than necessary and the viscosity of the liquid resin from increasing. As the curing retarder, for example, a curing retarder-2 for LTV manufactured by Toray Dow Corning Silicone can be used. The composition of each material is selected as appropriate by design. For example, SE1885A: SE1885B: tinuvin 109: cure retarder = 50 parts: 50 parts: 0.5 parts: 8 parts. In the preparation of the liquid resin material to be injected using the above materials, first, Tinuvin 109 is added to 1885A and mixed to obtain a mixed solution A. Furthermore, the liquid mixture B is obtained by adding a curing retarder to 1885B and mixing them. The mixed solution A and the mixed solution B are further mixed to obtain a mixed solution C, and the mixed solution C is stirred and mixed for a predetermined time (for example, 10 minutes). Thereafter, the mixture C is degassed under reduced pressure (for example, 2.00 × 10 ⁴ Pa → 0.01 × 10 ⁴ Pa, 10 minutes).
Thereby, the liquid resin material to be injected is obtained.

  When the liquid resin potting process is completed, the opening is sealed and the liquid resin is cured by heat treatment. In order to prevent an adverse effect on the display panel 230, it is preferable to select a resin that cures at 80 ° C. or 60 ° C. because the workability is good. Also, a resin that is cured at room temperature for a long time can be used, and in that case, the residual stress accompanying curing can be reduced most. In the example of the liquid resin material, the transparent gel-like resin layer 250 can be formed by curing at 60 ° C. for 60 minutes or curing at room temperature for 24 hours. Finally, a back frame such as aluminum metal is fixed to the back surface of the transparent front plate so as to accommodate the display panel 230.

  In place of the double-sided adhesive tape 510, a fast-setting silicone resin can be used to temporarily fix the display panel and the transparent front plate. For example, a gap between the display panel 230 and the transparent front plate 210 is obtained after positioning the display panel 230 and the transparent front plate 210 by attaching a double-sided adhesive tape having a thickness of 0.1 to 2.0 mm to a part. Next, a fast-curing silicone resin is injected from the surroundings. As a result, a sealed space other than the opening for injecting the liquid resin material can be formed. The transparent resin layer 250 can be formed by injecting the liquid resin material into this space while degassing it from the seal opening by the same method as described above and curing it at room temperature or at room temperature.

  Next, another more preferable aspect of the method for manufacturing the display device 100 will be described. As the display panel 230, a chiral nematic liquid crystal display panel formed by the same method as the above embodiment can be used. Also in this embodiment, the transparent resin layer 250 is formed by curing the liquid resin material injected between the display panel 230 and the transparent front plate 210. The manufacturing method of this embodiment can be used for forming a transparent resin layer with an elastic resin. Below, the manufacturing method of this aspect is demonstrated using the display apparatus 100 shown in FIG. 2 as an example.

  Similar to the above-described embodiment, a method of fixing a previously prepared chiral nematic liquid crystal display panel to the transparent front plate 210 will be described. 9 and 10 show a preferred embodiment of a method for fixing the display panel 230 and the transparent front plate 210. A plurality of double-sided adhesive tapes 610 which are examples of fixing members are attached to the display panel 230 or the transparent front plate 210. The double-sided adhesive tape 610 is attached so as to be finally disposed in the outer peripheral area 245 of the display area 231 of the display panel 230.

  As shown in FIG. 9, a plurality of double-sided adhesive tapes 610 (double-sided adhesive tape pieces) are attached so as to surround the display area 231 of each display panel 230 at a predetermined interval, and between the double-sided adhesive tapes 610. A gap (opening) is formed. Each double-sided adhesive tape 610 temporarily fixes the display panel 230 and the transparent front plate 210 to temporarily fix the display panel 230 to the transparent front plate 210 in the manufacturing process, and positions the display panel 230 at a predetermined position. To be used.

  In this way, a plurality of double-sided adhesive tapes 610 are arranged with a gap therebetween, and the display panel 230 and the transparent front plate 210 are fixed, thereby displaying by the stress applied from the transparent front plate 210 via the double-sided adhesive tape 610. It is possible to effectively suppress the panel 230 from being distorted and causing display unevenness. It is preferable that the liquid transparent resin and the resin having good wettability are applied to the wall surface of each double-sided tape 610 in contact with the liquid transparent resin, thereby reducing the generation of unnecessary bubbles when the liquid resin is injected. This is the same as the other aspects described above. In this embodiment, the double-sided adhesive tape 610 is attached to the outer peripheral area 245 of each of the two display panels 230.

  Next, they are aligned and overlapped so that the opening in the black outer peripheral area of the transparent front plate 210 and the display area of the display panel 230 overlap. The frame 620 is disposed on the back surface of the transparent front plate 210 so as to surround the two display panels 230, and the frame 620 is sealed with a silicone resin or the like between the frame 620 and the transparent front plate 210. It is fixed to 210. The frame 620 constitutes a side wall of the back frame 220 and can be formed of aluminum metal or the like. For example, the frame 620 is arranged so that the distance between the frame 620 and the end of the display panel 230 is about 1 to 2 mm.

Subsequently, an assembly 630 including the transparent front plate 210, the display panel 230, and the frame 620 is disposed in the vacuum chamber, and the inside of the vacuum chamber is decompressed. The degree of decompression in the vacuum chamber is preferably 1.33 × 10 ^{4 to} 6.67 × 10 ⁴ Pa. As a result, the display panel 230 and the space into which the liquid resin is injected are also placed in a reduced pressure state of the above-described reduced pressure. In this aspect, the liquid resin material is injected in the vacuum chamber in a reduced pressure state. By proceeding the depressurization, it is possible to effectively suppress the generation of bubbles when injecting the liquid resin material, particularly in the degree of depressurization within the above range.
In order to prevent an unfavorable influence due to the deformation of the display panel 230, the degree of reduced pressure is preferably 1.33 × 104 Pa or more. In another aspect described above, the display panel 230 can be deformed by reducing the pressure between the display panel 230 and the transparent front plate 220.
In this embodiment, the display panel 230 can be effectively prevented from being deformed by injecting the liquid resin material in the vacuum chamber.

As shown in FIG. 10, the liquid resin material is injected in the vacuum chamber.
An injection tube or injection needle 640 is inserted between the frame 620 and the display panel 230 to tilt the assembly 630. For example, one injection needle 640 can be inserted into each of the insertion positions 650 between the short side end portions of the two display panels 230 and the frame 620 wall surface. Liquid resin material injection can be performed simultaneously using two injection needles 640.

  One injection needle 640 can be used, or the liquid resin material can be injected in a plurality of times. By tilting the assembly 630, bubbles move in the liquid resin material, and bubbles generated by liquid resin material injection can be effectively removed. As shown in FIG. 10, in order to facilitate the injection of the liquid resin material, the assembly 630 is preferably tilted so that the side on which the injection needle 640 is inserted is up, but the assembly 630 is tilted so as to have another arrangement. You can also. The inclination angle θ is preferably 5 to 30 ° with respect to the horizontal.

In the state where the assembly 630 is inclined, the liquid resin material is injected from the injection needle 640. The tilt angle of the assembly 630 is preferably changed according to the injection state of the liquid resin material. In particular, it is preferable to set the tilt angle to a predetermined angle at the injection start timing of the liquid resin material, and gradually decrease the tilt angle as the injection of the liquid resin material proceeds.
As the injection of the liquid resin material proceeds, bubbles can be removed more effectively by gradually reducing the inclination angle.

  For example, at the start of liquid resin material injection, the tilt angle is set to 10 to 30 °, the tilt angle is changed to 2 to 10 ° at a predetermined timing, and then the tilt angle is set to 0 ° in a plurality of stages. The tilt angle can be changed. The tilt angle can be set and changed by tilting the assembly 630 or tilting the vacuum chamber in which the assembly 630 is housed.

  In the state where the assembly 630 is inclined, the liquid resin material is injected from the injection needle 640. The liquid resin material flows into the space between the display panel 230 and the transparent front plate 210 from the gap between the double-sided adhesive tape 610. As the liquid resin material to be injected, it is preferable to select a liquid resin agent having a low viscosity and a small surface tension in order to prevent generation of bubbles. On the other hand, in this embodiment, the periphery of the display panel 230 is not closed by the double-sided adhesive tape 610. The liquid resin material injected from the injection needle 640 flows out from between the display panel 230 and the transparent front plate 220 through the gap between the double-sided adhesive tapes 610.

  For this reason, a liquid resin material with low fluidity is used. The viscosity of the liquid resin material is preferably not less than a predetermined value. From the above viewpoint, the viscosity of the liquid resin material before curing is preferably 100 to 2000 mPaS (25 ° C.). In addition, as a specific liquid resin material, the same thing as the manufacturing method of the other aspect mentioned above including an ultraviolet absorber and a hardening retarder can be used. Therefore, a specific description is omitted here.

Preferably, an uncured liquid resin material is applied in advance to the interface of the display panel 230 with the transparent resin layer 250. By applying a liquid resin material in advance to the surface of the display panel 230 facing the transparent front plate 210, wettability to the injected liquid resin material can be improved, and bubbles are generated by the injection of the liquid resin material. Can be effectively suppressed.
Also, the liquid resin material can be applied in advance to the surface of the transparent front plate 210 that contacts the liquid resin material.

  When the liquid resin material is injected from the injection needle 640 with the assembly 630 tilted, the liquid resin material flows out from the gap between the double-sided adhesive tapes 610. In this embodiment, the entire periphery of the display panel 230 is surrounded by a closed frame 620. Therefore, the frame 620 disposed on the outer periphery of the display panel 230 can prevent the liquid resin material from flowing out. Thus, even when the display panel 230 and the transparent front plate 210 are fixed, the transparent resin layer 250 can be formed by curing the liquid resin material between the display panel 230 and the transparent front plate 210. . The transparent resin layer 250 is formed to fill the gap between the double-sided adhesive tape 610 in addition to the space between the display panel 230 and the transparent front plate 210, and covers almost the entire surface of the transparent front plate 210 in the frame 620. Formed.

  When the liquid resin potting process is completed, the liquid resin is cured by heat treatment. In order to prevent an adverse effect on the display panel 230, it is preferable to select a resin that cures at 80 ° C. or 60 ° C. because the workability is good. Also, a resin that is cured at room temperature for a long time can be used. These points are the same as in the manufacturing method of the other embodiment. Finally, the upper opening of the frame 620 is closed by the top cover.

  In the above, the example in which the liquid resin material is injected in a reduced pressure state in the chamber has been described. However, the frame surrounding the entire periphery of the display panel 230 is fixed to the transparent front plate 210 to form an airtight space, The inside can be in a reduced pressure state. As shown in FIG. 11, the frame 621 is fixed to the front plate 210. The frame 621 is a box-like body surrounding the periphery of the display panel 230, has an injection opening 622 for injecting a liquid resin material, and an injection needle 640 is inserted therein.

  Further, the frame 621 includes an exhaust port 623 for exhausting gas. By exhausting the gas inside the frame 621 from the exhaust port 623, the space into which the display panel 230 and the liquid resin are injected can be placed in a reduced pressure state. The preferred degree of vacuum is the same as above. As shown in FIG. 11, the injection opening 622 and the exhaust port 623 are formed on the upper surface of the frame 621 (the surface facing the transparent front plate 210). The frame 621 can be formed of a plurality of members. In particular, the upper surface portion of the frame 621 is preferably formed of a transparent plate body that effectively prevents deformation under reduced pressure. Thereby, the state of injection of the liquid resin material can be confirmed.

  Display data and control signals are given to the display device from an external computer. As the means, wired communication such as RS232C or wireless communication using infrared rays or radio waves can be used. FIG. 12 shows a preferable control mode of the display device 100. Preferably, display device 100 is controlled by wireless communication. The control device 701 can be configured by a hardware configuration, or by software and hardware. FIG. 12 shows an example in which the display device 100 is controlled by a computer in which software is installed.

  An antenna 702 for performing wireless communication can be formed on the back surface or the front surface of the transparent front plate 210 of the display device 100. The antenna can be formed by, for example, a printed pattern using conductive ink. Thereby, control by reliable wireless communication can be performed. By controlling the display content of the display device 100 using wireless communication, it is possible to cope with various installation locations. In addition, it is possible to easily change the display contents in a state where the display device 100 is installed.

  In order to display desired image data on the display device 100, the control device 701 generates bitmap image data in accordance with the screen size of the display device 100. The bitmap image data can be generated according to user input or stored in advance in a memory. Next, the bitmap image data is converted into display data that can be displayed on the chiral nematic liquid crystal display element.

Multi-color display can be performed by stacking chiral nematic liquid crystal display cells reflecting different colors as shown in FIG. In this example, two chiral nematic liquid crystal display cells are stacked, and each cell displays complementary colors (blue and yellow).
Further, a black colored layer is provided on the back side of the back side substrate of the panel. As a specific method, an arbitrary threshold value is set for each of RGB colors (R, G, and B each of 8 bits), and the set threshold value is compared with the intensity of RGB. As a result, each RGB colorant is changed from 8 bits to 1 bit, and the RGB expression colors are changed to 8 colors (black, blue, green, cyan, red, magenta, yellow, white). For example, Japanese Patent Application Laid-Open No. 2003-315763 describes the technology.

  For example, when the expression color is gray (R, G, B) = (128, 128, 128) in a 24-bit / 256-gradation bitmap image, if the threshold is set to less than 127, gray is converted to white, If is set to 128 or more, gray is converted to black. The expression color by RGB is limited, and attributes corresponding to four colors (black, blue, yellow, white) are added. Thereby, the expression color by RGB is changed from 8 colors. The color is converted into four colors that can be displayed on a chiral nematic liquid crystal display element.

  The above-described panel configuration is changed from four colors (green, cyan, red, magenta) of the image data composed of eight colors to “green to yellow”, “cyan to white”, “red to orange”, and “magenta to blue”. To display color. The display data converted for chiral nematic liquid crystal display panel display is wirelessly transmitted to the display device 100 using Bluetooth (registered commercial law) technology or the like.

  The display device 100 can include a plurality of memory areas as storage locations for storing display data. The transmission data display data is stored in one of the memory areas. By specifying a memory area from the control device 701, display data can be stored in a specific memory area, and display data stored in the specific memory area can be displayed in the display area of the display device 100. .

FIG. 3 is a schematic plan view in one display state of the display device according to the present embodiment. 1 is a schematic configuration diagram of an example of a display device according to an embodiment of the present invention. The typical block diagram in an example of the other display apparatus which concerns on this Embodiment. The typical block diagram in an example of the other display apparatus which concerns on this Embodiment. The typical block diagram in an example of the other display apparatus which concerns on this Embodiment. The typical block diagram in an example of the other display apparatus which concerns on this Embodiment. FIG. 3 is a schematic cross-sectional view of a two-layer display panel that can be used for the display device according to the embodiment. FIG. 10 is a schematic configuration diagram illustrating an injection process of a display device according to this embodiment. The figure explaining the state in the manufacturing process of the display apparatus which concerns on other preferable embodiment. The typical block diagram explaining the injection | pouring process of other preferable embodiment. The typical block diagram explaining the injection | pouring process of other preferable embodiment. 8A and 8B illustrate a method for controlling a display device according to this embodiment.

Explanation of symbols

210 transparent front plate 211 jig 220 back frame 230 display panel 231 display area 232 chiral nematic liquid crystal display cell 233 chiral nematic liquid crystal display cell 234 first substrate 235 row electrode 236 second substrate 237 column electrode 238 peripheral sealing material 239 chiral nematic liquid crystal layer 240 Black colored layer 245 Peripheral region 250 Transparent gel-like resin layer 260 Wall 270 Transparent front plate 610 Adhesive tape 620 Frame 621 Frame 630 Assembly

Claims (24)

A display panel having a display area for displaying an image;
A transparent front plate disposed in front of the display panel;
A gel-like transparent resin layer formed between the front plate and the display area;
A display device comprising:   The display device according to claim 1, wherein the gel-like transparent resin layer is formed so as to cover a substantially entire region of the display region.   The display device according to claim 1, wherein the gel-like transparent resin layer has a ¼ consistency of 5 to 500.   The display device according to claim 1, 2 or 3, wherein the gel-like transparent resin layer is formed by curing a two-component liquid resin material injected between the display panel and the front plate. .   The display device according to claim 4, wherein the liquid resin material has a viscosity of 100 to 2000 mPaS (25 ° C.). A display panel having a display area for displaying an image;
A transparent front plate disposed in front of the display panel;
A transparent elastic resin layer that is formed between the front plate and the display region and suppresses stress from the front plate to the display panel;
A display device comprising:   The display device according to claim 6, wherein the transparent elastic resin layer has a tensile elastic modulus at 25 ° C. of 100 MPa or less.   The display device according to any one of claims 1 to 7, wherein a laminated structure not including an air layer is formed between the display region and the front plate.   9. The display device according to claim 6, wherein the transparent elastic resin layer is formed by curing a two-component liquid resin material injected between the display panel and the front plate.   The display device according to claim 1, wherein the display panel displays an image according to a plurality of memory display states.   The display device according to claim 4, wherein the liquid resin material includes a curing retarder.   The display device according to claim 1, wherein the front plate is an inflexible glass plate.   The display device according to claim 1, wherein the front plate has a curved shape.   The display device according to claim 1, wherein the display panel is a liquid crystal display panel, and the transparent resin layer includes an ultraviolet absorber. A display device having a display area for displaying an image, and a transparent front plate disposed on the front surface of the display panel, comprising:
Fixing the display panel and the front plate with a fixing member;
Injecting a liquid resin material in a reduced pressure state into a space formed between the display panel and the front plate;
Curing the liquid resin material and forming an elastic transparent resin layer or a gel-like transparent resin layer between the display panel and the front plate;
A method for manufacturing a display device. The method for manufacturing a display device according to claim 15, wherein the liquid resin material is injected at a reduced pressure of 1.33 × 10 ^{4 to} 6.67 × 10 ⁴ Pa in the step of injecting the liquid resin material.   The method for manufacturing a display device according to claim 15 or 16, wherein, in the step of injecting the liquid resin material, the liquid resin material is injected in a state where the display panel and the front plate are inclined.   18. The method of manufacturing a display device according to claim 17, wherein in the step of injecting the liquid resin material, an inclination angle of the display panel and the front plate with respect to the horizontal is changed according to an injection amount of the liquid resin material. The display panel and the front plate are fixed by a plurality of fixing members arranged with a gap,
The step of injecting the liquid resin material comprises flowing the liquid resin material from the space formed between the display panel and the front plate through the gap, while allowing the liquid resin material to flow between the display panel and the display panel. The method for manufacturing a display device according to claim 16, wherein the liquid crystal is injected into a space formed between the front plate and the front plate.   The display according to any one of claims 15 to 19, wherein a frame surrounding the display panel and preventing the liquid material from flowing out is fixed to the front plate before the step of injecting the liquid resin material. Device manufacturing method. Before the step of injecting the liquid resin material, the frame surrounding the display panel and formed with an exhaust port is fixed to the front plate,
The step of injecting the liquid resin material is to reduce the pressure in the frame by exhausting gas from the exhaust port.
The manufacturing method of the display apparatus of any one of Claims 15-20.   The method for manufacturing a display device according to any one of claims 15 to 21, wherein the liquid resin material is a two-component curable resin that does not contain a solvent. A display panel having a display area for displaying an image;
A transparent front plate disposed in front of the display panel;
A transparent resin layer that is formed between the front plate and the display region and suppresses stress on the display panel;
A plurality of fixing members disposed between the display panel and the front plate and fixing the display panel and the front plate;
The plurality of fixing members are arranged with a gap therebetween, and the gap is filled with the transparent resin layer.
Display device.   The display device according to claim 23, wherein the transparent resin layer is formed of a gel-like resin.

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