JP2011007892A - Display apparatus, and method for manufacturing housing for display provided to the display apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display apparatus having a function of controlling a viewing angle, wherein design property of a display screen is improved and moisture or water does not remain inside.SOLUTION: A housing 20 for display arranged so as to cover a display output functional part 50 and fixed to a housing 7 for storage is formed of a light transmissive resin. On a light incidence side principal plane 201 of the top plate 20a of the housing 20 for display, a viewing angle control area 21 and a non-viewing angle control area 22 are provided opposite to a display element 5 of the display output functional part 50.

Description

  The present invention relates to a display device having a viewing angle control function for limiting a light emission angle at least in part, and a method for manufacturing a display casing having a viewing angle control function provided in the display device. is there.

In recent years, as represented by a mobile phone or the like, a display device using an electroluminescence element, a liquid crystal element, or the like has been miniaturized and is easily used in various environments. However, for example, when confirming personal information in a crowded environment, or using a keypad displayed on a display screen having a touch panel function on an ATM (Automated Teller Machine) information terminal, In applications where it is difficult to look into the screen from people around, such as when inputting, the information displayed by the display device is visible to the observer but not visible to others, that is, the viewing angle. It is necessary to limit. In response to such a demand, a viewing angle control sheet has been developed, and the display device that controls the viewing angle to a desired angle by arranging it on the observer side of the display element, such as the above ATM display, car navigation system, etc. Used in many ways.
Here, as a sheet having a conventional viewing angle control function, a relatively wide stripe made of a transparent resin material and a relatively narrow stripe made of an opaque resin material are alternately arranged, An optical aperture structure is disclosed, and such a sheet is produced, for example, by slicing a block of transparent and opaque sheets mounted on every other. (For example, Patent Document 1).

A typical example of a display device using such a viewing angle control function is shown in FIG.
FIG. 6 is an exploded perspective view of the display device 100 using the viewing angle control sheet. In the figure, a display output function unit 50 including a light source 1, a reflector 2, a reflection sheet 3, a light guide plate 4, a liquid crystal display device 5, an optical sheet 6, a viewing angle control sheet 10 and the like is housed in a housing 7. ing. As shown in FIG. 6, the housing 7 has side walls 7a on three sides and a seat surface 7b, and a side wall opening 7c is provided on the left side of FIG. The reflector 2 is attached to the side wall opening 7c. A screen-side casing 8 is provided on the viewing angle control sheet 10 and is fixed to the casing 7.

Japanese Examined Patent Publication No. 47-043845

In the viewing angle control sheet disclosed in Patent Document 1, a transmission portion made of a light-transmitting plastic and a light absorption portion made of a light-absorbing material are alternately arranged to form an optical aperture.
However, when such a viewing angle control sheet is incorporated in a conventional typical display device 100 as shown in FIG. 6 that limits the viewing angle to a desired range, there are the following problems.
That is, the region incorporating the viewing angle control sheet 10 has a color tone exhibited by the light-absorbing material when viewed from outside the viewing angle, and this is different from the color scheme used for the casings 7 and 8 of the display device 100. The design property will be impaired. In addition, even when the light-absorbing material and the casings 7 and 8 are adjusted to have the same color tone, a step or a gap is visible at the boundary between the display screen and the portion surrounding the display screen of the casing 8. There is a problem that the designability is lowered. Further, since the step or gap is a joint between the screen-side casing 7 and the viewing angle control sheet 10 which are separate members, when the liquid adheres to the display device 100 or is immersed in the liquid, Since the liquid or the like enters the display device and causes performance degradation, a packing or the like is provided under the screen-side housing 8 to take a waterproof measure. However, there is a problem that the step is increased, the number of parts is increased, and the cost is high. .

  Similarly, when the viewing angle control sheet of Patent Document 1 is applied to the display device 100 configured as shown in FIG. 6, the display screen is displayed to indicate that it is in operation even from a distance, such as an ATM information terminal. Entering a PIN using a keypad displayed on a display screen with a wide viewing angle and a touch panel function to function as a so-called sign lamp that can be confirmed to be lit For the recent needs to have a narrow viewing angle in order to prevent the people around you from knowing the PIN code, so as to perform the so-called peep prevention function, sign lights and peep prevention, There is a problem that it is difficult to achieve conflicting functions.

  The present invention has been made in order to solve the above-described problems. In the display device, the display content of a specific portion is made invisible from the outside of the viewing angle, and the other portions are normally viewed at a viewing angle. It is an object of the present invention to provide a display device in which the design of the display screen is improved and there is no fear of stagnation of moisture and moisture, and a method for manufacturing a display casing provided in the display device.

  A display device according to a first aspect of the present invention is provided with a housing for housing a display output function unit, and a display housing disposed so as to cover the display output function unit and fixed to the housing for housing. The display housing is made of a light-transmitting resin, has a side wall integrated with the top plate as a display surface, and has a light incident side main surface facing the display output function part of the top plate. Includes a viewing angle control region in which light transmission portions and light absorption portions are alternately arranged and a non-viewing angle control region. The viewing angle control region is a display provided in the display output function unit. It is provided at a position facing the element.

According to a second aspect of the present invention, there is provided a display casing manufacturing method in which the display casing of the display device according to the first aspect of the present invention includes the following steps.
(1) A step of filling a light-transmitting molten resin in a pattern formed on a mold and molding an element body of a display casing having a side wall provided integrally with a top plate by an injection molding method.
(2) After masking the non-field-of-view control region of the light incident side main surface of the display housing element, light is absorbed by the entire surface of the light incident side main surface including masking and the side wall surface connected to the light incident side main surface. Forming a paint;
(3) A step of removing the light-absorbing paint and the masking on the upper surface of the masking.
(4) The light incident side main surface which is connected to the side wall and which is close to the light incident side main surface close to the viewing angle control region, and the light absorbing paint formed in the side wall and the groove of the viewing angle control region is left. Removing the light absorbing paint on the surface.
(5) A step of forming and curing a light-transmitting coating film containing no color pigment on the light incident side main surface exposed in step (4).

  According to the first invention, since the display device adopts the above-described configuration, the display housing forms a part of the housing of the display device, and thus is provided on a conventional display screen. There is no need to provide a screen-side casing, and there is no step or gap at the boundary between the display screen and the screen-side casing, which improves the design around the display screen and may cause moisture or moisture to stay. Nor. Therefore, it is possible to obtain a display device having a stable display screen with a reduced number of parts and man-hours, and is inexpensive and highly productive.

  According to the second invention, since the manufacturing method as described above is adopted, since the viewing angle control area and the top plate and the side wall of the display housing are the same color or the same color, from outside the viewing angle. When viewed, the portion other than the non-viewing angle control region can be the same appearance as the case of a housing of the same color or a similar color, and for display of a display device with high design without any trouble in appearance A housing can be obtained.

FIG. 2 is an exploded perspective view showing the display device according to the first embodiment and a partially enlarged view thereof. 4 is a diagram showing a schematic arrangement state of a display output function unit of the display device according to Embodiment 1. FIG. FIG. 3 is an enlarged view of a top plate portion of a display housing according to Embodiment 1. FIG. 6 is a diagram showing a manufacturing flow of the display housing according to the first embodiment. FIG. 10 is a diagram showing reinforcing ribs of a display housing according to a second embodiment. It is a disassembled perspective view which shows the conventional display apparatus.

Embodiment 1 FIG.
A display device using a display housing having a narrow field of view and a wide field of view according to Embodiment 1 of the present invention will be described below with reference to FIG.
FIG. 1A is an exploded perspective view of the display device 100, and the difference in configuration between the display device 100 of FIG. 1A and the conventional display device 100 of FIG. The viewing angle control sheet 10 and the screen-side casing 8 in FIG. 6 are replaced with the display casing 20 in FIG. That is, the display output function unit 50 including the light source 1, the reflector 2, the reflection sheet 3, the light guide plate 4, the liquid crystal display device 5, the optical sheet 6, and the like is provided in the storage case 7 and the display case 20. Has been placed.
The AA cross section and BB cross section of FIG. 1 (a) are shown in FIG. 1 (b) and FIG. 1 (c), respectively. A display housing 20 shown in FIG. 1A includes three side walls 20b, 20c, and 20d formed integrally with a top plate 20a that forms a display surface as the display device 100, and is shown in FIG. An opening 20e is provided on the left side. And the space part 20f is formed as shown in FIG.1 (b) and FIG.1 (c) by the top plate 20a and the three side walls 20b-20d.

The display housing 20 has a predetermined thickness t. As shown in FIG. 1B and FIG. 1C, the light incident side main body located on the space 20f side of the top plate 20a forming the display surface. The surface 201 is provided with a viewing angle control region 21 having a function of controlling the viewing angle and a non-viewing angle control region 22. FIG. 1A shows a state in which the display as shown in the figure is made in the viewing angle control region 21 and no display is made in the non-viewing angle control region 22.
As described above, in the display housing 20 according to the first embodiment, the light transmitting portions made of the light transmitting material and the light absorbing portions made of the light absorbing material are alternately arranged as will be described in detail later. The viewing angle control region 21 is partially formed at a position facing the display element (the liquid crystal display device 5) and faces the housing 7 that houses the display output function unit 50 of the display device 100. The three side walls 20b-20d formed integrally with the top plate 20a forming the display surface also serve as a lid. FIG. 2 shows a display output function unit composed of a reflection sheet 3, a light guide plate 4, a liquid crystal display device 5, an optical sheet 6, a power source and a rechargeable battery 71 constituting the display device 100 in the AA cross section of FIG. 50 is a schematic layout diagram arranged in the housing 7 and in the space 20 f of the display housing 20. The light source 1 and the reflector 2 constituting the display output function unit 50 that do not appear in the section AA are also arranged in the housing case 7 and the space 20f. Here, although the non-viewing angle control region 22 is shown in a substantially rectangular shape, the shape of the viewing angle control region 21 is not particularly specified, and among the information displayed on the liquid crystal display device 5, the viewing range. As long as it is a dimension that can cover the region where the limit is to be limited, it can be of any shape and dimension.

  FIG. 3 is a partially enlarged cross-sectional view of the viewing angle control region 21 and the non-viewing angle control region 22 for explaining a top plate 20a portion as a display surface forming the display housing 20 in the first embodiment. It is. In FIG. 3, the top plate 20a of the display housing 20 has a light incident side main surface 201, a light output side main surface 202, a light absorbing portion 211 made of a light absorbing material, and a light transmissive made of a light transmissive material. A part 212 is provided. W is the width of the light absorber 211, D is the height, and P is the pitch. These width W, height D, and pitch P are design parameters that can be arbitrarily determined as long as the viewing angle can be set in a desired range and productivity can be secured.

Next, the main constituent members will be described more specifically.
The non-viewing angle control region 22 and the light transmission part 212 of the viewing angle control region 21 are made of polycarbonate resin (PC) having a refractive index n of 1.58. The light absorbing portion 211 is an ultraviolet curable acrylic having a refractive index n of 1.52 and containing a color pigment as a light absorbing material in a groove portion 213 formed in the light incident side main plane 201 in substantially the same shape as the light absorbing portion 211. It is constructed by filling a resin. The reason why the groove portions have substantially the same shape is that when the light absorbing material is hardened, the groove portions are slightly shrunk. Carbon black having an average particle size of 1 μm or less was used as the color pigment. Here, it is preferable that the light absorption unit 211 has a size smaller than the visual resolution of the observer so that the display quality of the display device 100 is not deteriorated and is not visually recognized by the observer. The light absorbing material needs to be filled in the groove 213 formed in substantially the same shape as the light absorbing portion 211. For this reason, the color pigment contained in the light absorbing material needs to have a fine particle size so as not to inhibit the flow of the light absorbing material when filling the groove portion 213. The color pigment to be contained in the light absorbing material preferably has a maximum particle size of 1/2 or less of the minimum width of the groove 213 so as not to cause local defects. / 5 or less is the maximum particle size. In order to improve the overall fluidity of the light-absorbing material and to ensure productivity, the color pigment preferably has an average particle size of 10 μm or less, more preferably 1 μm or less. .

  In the first embodiment, the viewing angle control region 21 of the display housing 20 is substantially square, the non-viewing angle control region 22 is substantially rectangular, and the non-viewing angle control region 22 is formed on the display housing 20. Among them, a part of the top plate 20a serving as a display screen, which is located at the position of the cross section BB shown in FIG. In addition, the pitch P of the light absorbing portions 211 is set to 60 [μm], the width W is set to 25 [μm], the height D is set to 150 [μm], and the thickness t of the main part of the display housing 20 is ensured from the viewpoint of securing strength. To 2 [mm]. Of the information displayed on the liquid crystal display element 5, the relative position between the liquid crystal display element 5 and the display housing 20 is adjusted so that the portion for displaying the content whose viewing angle is to be limited is covered by the viewing angle control region 21. Has been.

  Next, a manufacturing method of the display housing 20 in which the groove 213 having substantially the same shape as the light absorbing portion 211 is partially formed on the surface that becomes the light incident side main surface 201 of the first embodiment will be described. The injection compression molding method was selected as the molding method. In this injection compression molding method, in synchronism with mold clamping, the molten resin is injected just before the mold clamping is completed, so that the molten resin is filled in patterns such as grooves and holes formed in the iron mold in advance. In addition to the injection pressure and holding pressure used in the normal injection molding method, the mold clamping force of the injection molding machine can be used as the force for faithfully transferring the pattern. The formed pattern has good transferability and can be suitably used as a molding method for obtaining a display housing having a fine shape like the optical sheet of the first embodiment. Here, as a mold used for molding, the surface roughness is controlled by means such as polishing the surface so as to obtain surface smoothness that does not cause light scattering at least when used in the visible light region. In addition, when the display housing 20 is used, a groove portion having substantially the same shape as the light absorbing portion 211 is formed on the surface that becomes the light incident side main surface 201 so as not to cause a decrease in visibility due to birefringence. The display housing 20 in which the 213 is partially formed needs to have a gate shape that can reduce the residual stress. Inside the mold, a mold insert having substantially the same size as that of the region 21 where the viewing angle control unit is formed is installed, and on the surface of the mold insert, a fine wall having substantially the same shape as the absorption unit 211 is provided. Is formed. Here, the mold insert forms a nickel phosphorus electroplated film having a thickness of 200 μm on the mold material using a mold material as a base material, and the light transmitting portion 212 is formed on the nickel phosphorus electroplated film. And a diamond cutting tool having substantially the same shape as the processing tool, and precision cutting that leaves a fine wall having the same shape as that of the light absorbing portion 211.

As the resin used for the injection compression molding, Iupilon H3000 manufactured by Mitsubishi Engineering Plastics, which is a thermoplastic resin material, was selected, and the resin temperature in the injection cylinder was set to 320 ° C. In the resin molding of the display housing 20 in which a fine groove portion having substantially the same shape as the light absorbing portion 211 is partially formed on the surface to be the light incident side main surface 201 as shown in the first embodiment, a molten resin It is important to properly control the fluidity of the resin, and the resin temperature in the injection cylinder is set as high as possible without causing resin burning. For example, in the case of the Iupilon H3000, The resin temperature at 280 ° C. is preferably 280 ° C. or higher and 340 ° C. or lower. In addition, since it is necessary to maintain the fluidity of the resin in the mold, the setting of the mold temperature is also an important parameter. This time, the mold temperature was 140 ° C. It is important to determine the mold temperature in consideration of the molding cycle, that is, the balance between productivity and transferability of fine patterns, and light on the surface that becomes the light incident side main surface 201 as shown in the first embodiment. In the resin molding of the element body of the display housing 20 in which the fine groove part having substantially the same shape as the absorbing part 211 is partially formed, the mold temperature is preferably set to 80 ° C. or more and 140 ° C. or less.
The material used for the display housing 20 may be a thermoplastic resin such as polycarbonate or an ultraviolet curable resin having the same optical properties.

Next, an ultraviolet curable acrylic resin containing a color pigment as the light absorbing material in the groove portion 213 on the surface to be the light incident side main surface 201 obtained as described above (hereinafter abbreviated as light absorbing paint). A method for satisfying this will be described with reference to the drawings. 4A to 4E, a light-absorbing paint is applied to the light incident side main surface 201 of the display housing 20 and the groove 213 is filled with the light-absorbing paint, and at the same time, formed integrally with the top plate 20a. It is a figure explaining the process of forming the coating film by a light absorption coating material in the surface facing the space part 20f of the made side walls 20b-20d. Here, FIGS. 4A to 4E are cross-sectional views in which a part of FIG. 1C is enlarged, and are shown upside down. As shown in FIG. 4B, only the portion that becomes the non-viewing angle control region 22 is covered with the masking tape 90 on the surface that becomes the light incident side main surface 201 obtained as described above, and then sprayed. The light-absorbing paint is sprayed using the method, and the light-absorbing coating 91, 92, 93, 94 made of the light-absorbing paint on the entire surface including the groove 213 on the light incident side main surface 201 side and the masking tape 90 is used. Is obtained (FIG. 4B). Next, the light-absorbing coating film 94 formed on the masking tape 90 together with the masking tape 90 is peeled off (FIG. 4C).
Next, a light-absorbing coating film 93 is removed using a urethane rubber blade having substantially the same width as that of the region to be the viewing angle control region 21, and the light is applied using a cloth soaked with a cleaning liquid. The light-absorbing paint remaining on the transmission part 212 is completely removed (FIG. 4D). Next, after standing for 15 minutes in a drying furnace adjusted to 75 ° C. and drying, ultraviolet rays are irradiated to cure the paint as a light absorbing portion 211 filled in the groove portion 213, the light incident side main surface 201. Thus, a cured coating material is obtained as the light-absorbing coating film 91 formed in the vicinity of the side walls 20b to 20d and remaining on the side walls 20b to 20d connected thereto (same as in FIG. 4D).

Next, a light-transmitting paint from which the color pigment is removed is sprayed on the surface on the light incident side main surface 201 side by a spray method to form a light-transmitting coating film 95, and the inside of the drying furnace adjusted to 75 ° C. And then left to dry for 15 minutes, and then irradiated with ultraviolet rays to obtain a cured paint (FIG. 4E). Here, in FIG. 4E, the light-transmitting coating film 95 is formed in a region excluding the cured paint formed on the surface on the light incident side main surface 201 side. If it is a surface on the main surface 201 side, there is no particular need to limit the region, and the range for forming the coating film may be determined in consideration of productivity and the yield of the paint.
In addition, the part which forms the light absorption coating film 91 arrange | positions LED etc. in the display output function part 50, after giving light transmittance to the part etc. which put the logo as the display apparatus 100, etc. It may be partially formed in consideration of the case where the provided portion is lit or the case where the inside of the display device 100 is partially shown (skeleton design) in consideration of design.

In the first embodiment, the method of masking only the non-viewing angle control region 22 and simultaneously filling the light absorbing paint into the inner surface of the display housing 20 and the light absorbing portion 211 has been described. As an embodiment of the present invention, a method may be used in which the light absorbing paint is applied in the following steps, and the light absorbing portion 211 is filled with the light absorbing paint simultaneously. That is, the area other than the non-viewing angle control area 22 and the viewing angle control area 21 is covered with a masking tape in advance, and the light-absorbing paint is dropped after being treated so that the light-absorbing paint is not applied. The groove 213 is filled with the light-absorbing paint while the light-absorbing paint is spread on the display housing 20 by a blade having substantially the same width as the light transmitting portion 212. In this case, it is important to adjust the surface tension / viscosity of the light-absorbing paint and the pressing pressure / movement speed of the blade so that the paint reaches the bottom of the groove 213. Next, the light absorbing paint adhering excessively is completely wiped off, dried, and cured by irradiation with ultraviolet rays.
Next, a portion that becomes the viewing angle control region 22 is covered with a masking tape, and a light-shielding paint exhibiting a desired color is sprayed on the light incident side main surface 201 by spray coating, and is dried. Form a coating. In the first embodiment, an acrylic resin-based paint in which carbon black is dispersed as a pigment is used, and the film thickness is set to 20 [μm]. Drying was performed at 75 ° C. for 15 minutes, and the area where the film was formed was cleaned with a cloth soaked with a 50% aqueous solution of isopropyl alcohol before spray coating of the paint.

The display casing 20 obtained through such a process is arranged as a component part of the display device 100 in the configuration of FIG. 1, so that only the viewing angle control region 21 is narrowed, that is, peep prevention is performed. The non-viewing angle control region 22 can have a wide field of view, that is, can function as a sign lamp, and the display device 100 having excellent assemblability can be obtained. Further, the viewing angle control region 21 of the display housing 20 and the region 21 are connected to the region 21, and the portions adjacent to the side walls 20 b to 20 d of the light incident side main surface 201 and the side walls 20 b to 20 d are the same color or similar colors. Therefore, it is possible to obtain a display device 100 that is compact and has a high design property, with no complicated appearance. Furthermore, since the screen-side casing 8 as in the prior art is not provided, the display device 100 is free from steps and gaps with respect to the display surface, does not deteriorate in design, and does not retain moisture.
Furthermore, since the light-transmitting resin is arranged on the observer side, when viewed from the observer only by forming one light-absorbing coating film, the air-light-transmitting casing, the light-transmitting casing, Two optical interfaces of the casing and the light-absorbing coating film can be formed, and the display device 100 with high gloss and high design is obtained.

Embodiment 2. FIG.
Next, a method for manufacturing the display housing 20 according to the second embodiment will be described.
In the display device 100 according to the second embodiment, the display housing 20 is formed by an injection molding method with the same shape and dimensions as those of the first embodiment. Here, after obtaining the display casing 20 by injection molding, the mold on the light incident side main surface 201 side while holding the surface of the light emitting side main surface 202 of the display casing 20 in the mold. The mold and the cylinder for injecting the resin are removed, and a mold having a void having a shape that is approximately the same shape as the molded body 20 and that can be added with a rib for strength reinforcement is displayed in a region other than the viewing angle control region 21. A cylinder for injecting a molten resin adjusted to a desired color is set together with the mold that holds the surface on the light emission side main surface 202 side of the housing 20 for injection molding. In other words, by the two-color molding generally called, the rib 20h for color development on the light incident side main surface 201 side of the display housing 20 and the strength reinforcement of the structure are integrally molded at the corner portion with the side walls 20b to 20d. To do. An example in which the reinforcing rib 20h is provided is shown in FIG.
Next, the light absorbing paint is filled in the groove 213 of the light absorbing portion 211 by the method shown in the first embodiment.
By arranging the display casing 20 obtained through such steps as a component part of the display device 100 in the configuration of FIG. 1, the same effects as those of the first embodiment can be obtained, and in addition, the display casing can be obtained. The body 20 can be integrated with a member that reinforces the strength without causing any problems in appearance and obtains a desired color that is set as the appearance of the display device. Can be obtained with good productivity by adopting another manufacturing process, that is, energy saving. In addition, the structure is easy to disassemble and reassemble.

  The present invention can be used for a display device using an electroluminescence element, a liquid crystal element or the like, for example, a mobile phone, a touch panel of an ATM machine, or the like.

5 liquid crystal display device, 7 housing for storage, 20 display housing, 20a top plate,
20b-20d side wall, 20h reinforcing rib, 21 viewing angle control region,
22 non-viewing angle control region, 50 display output function unit, 100 display device,
201 light incident side main surface, 202 light emission side main surface, 211 light absorbing portion, 212 light transmitting portion.

Claims (6)

In a display device provided with a housing for housing a display output function unit, and a display housing disposed so as to cover the display output function unit and fixed to the housing for housing,
The display casing is formed of a light-transmitting resin, provided with a side wall integrated with a top plate serving as a display surface, and has a light incident side main surface facing the display output function unit of the top plate. The surface is provided with a viewing angle control region in which light transmitting portions and light absorbing portions are alternately arranged, and a non-viewing angle control region, and the viewing angle control region is provided in the display output function unit. A display device, wherein the display device is provided at a position opposite to the display element. The display device according to claim 1, wherein a light-absorbing coating film is formed on at least a part of the light incident side main surface of the display casing facing the display element. The display device according to claim 2, wherein the object color exhibited by the light-absorbing coating film and the object color exhibited by the light-absorbing part are the same system or the same color. 4. A reinforcing rib is provided at a corner portion between the light incident side main surface and the side wall, and a light-absorbing coating film is formed on the reinforcing rib. The display device described. The display casing of the display device according to claim 1 is manufactured by the following steps.
(1) A step of filling a light-transmitting molten resin in a pattern formed on a mold and molding an element body of a display casing having a side wall provided integrally with a top plate by an injection molding method.
(2) After masking the non-field-of-view control region of the light incident side main surface of the display casing body, light is applied to the entire surface of the light incident side main surface including masking and the side wall surface connected to the light incident side main surface. Forming an absorbent paint;
(3) A step of removing the light-absorbing paint on the upper surface of the masking and the masking.
(4) The light incident side main surface close to the viewing angle control region and the side wall, and the side wall, and the light absorbing paint formed in the groove of the viewing angle control region are left. Removing the light-absorbing paint on the light incident side main surface;
(5) A step of forming and curing a light-transmitting coating film containing no color pigment on the light incident side main surface exposed in step (4). The display casing of the display device according to claim 1, wherein the display casing is manufactured by the following steps.
(1) A step of filling a light-transmitting molten resin in a pattern formed on a mold and molding an element body of a display casing having a side wall provided integrally with a top plate by an injection molding method.
(2) The mold used in the step (1) is held by the mold on the light emitting side main surface, and the mold capable of forming a reinforcing rib is combined with the mold to obtain a desired color. A step of injection molding a molten resin.
(3) After masking the non-field-of-view control region of the light incident side main surface of the display housing element, light is applied to the entire surface of the light incident side main surface including masking and the side wall surface connected to the light incident side main surface. Forming an absorbent paint;
(4) The step of removing the light-absorbing paint on the masking upper surface and the masking.
(5) The side that is connected to the side wall, the light incident side main surface adjacent to the viewing angle control region, and the side wall, and the light absorbing paint formed in the groove of the viewing angle control region are left, Removing the light-absorbing paint on the light incident side main surface;
(6) A step of forming and curing a light-transmitting coating film containing no color pigment on the light incident side main surface exposed in the step (5).

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