JPWO2013140464A1 - Electronics - Google Patents

Abstract

The mold frame 5 is formed to project outward from the periphery of the frame opening, and guides light from the backlight light source guided by the light guide plate 6 to the illumination unit around the liquid crystal display panel 4. The unit 5b is provided.

Description

  The present invention relates to an electronic apparatus including a display unit that displays an image by transmitting light from a backlight such as a liquid crystal display device to a display panel.

An electronic apparatus such as a liquid crystal display device generally includes a display unit in which a liquid crystal display panel and a backlight are modularized, and the light from the backlight is used only to illuminate the liquid crystal display panel. In addition, in conventional electronic devices, when exposure illumination is performed from an operation key provided around the display unit or a predetermined part of the device casing other than the display unit, a dedicated light source such as an LED is generally used. However, it is inefficient to provide a light source separately from the backlight, and there is a concern that the number of parts increases and the manufacturing process becomes complicated and the cost of the product increases.
On the other hand, conventionally, the shape of the light guide plate that guides the light of the backlight light source to the display panel is guided to the operation keys around the display unit and a predetermined location of the device housing. As described above, techniques for enlarging have been proposed (see, for example, Patent Documents 1 and 2).

JP 2009-70719 A JP 2009-129560 A

  A predetermined space is provided between the liquid crystal display panel and an illumination configuration such as a light guide plate that illuminates the liquid crystal display panel by guiding the light from the light source for the backlight. There is a need. Further, in a general liquid crystal display device, an illumination configuration such as a light guide plate is stored in a holding housing so that dust does not flow between the liquid crystal display panel and the light guide plate, and the liquid crystal display panel is attached to the holding housing. So that it is isolated from the outside.

However, as in Patent Documents 1 and 2, if the light guide plate is enlarged so that the light from the backlight light source is guided to the operation key around the display unit or a predetermined location on the device housing, the light guide plate is guided from the holding housing. A part of the light plate protrudes, and the inside of the holding housing is unavoidably opened to the outside.
For this reason, there is a possibility that dust enters the space between the liquid crystal display panel and the stored item in the holding housing opposite to the liquid crystal display panel to deteriorate the display quality.

  The present invention has been made to solve the above-described problems, and can guide light from a backlight light source to an illumination unit other than a liquid crystal display panel while preventing deterioration of display quality due to dust. The purpose is to obtain an electronic device that can be used.

  In the electronic device according to the present invention, a case having an opening on one side and housing an illumination light source unit including a light guide, and a flange portion projecting inwardly at the periphery of the frame opening are formed. A holding housing having a frame with a flange portion sandwiching the light guide between the case and the outer periphery of the frame is fixed to the flange portion of the frame and guided from the light source guided by the light guide. In an electronic device provided with a liquid crystal display panel whose back side is illuminated with light, the frame is formed to project outward from the periphery of the frame opening, and the light from the light source guided by the light guide is transmitted to the liquid crystal display panel. A light guide shape part for guiding light to the surrounding illumination part is provided.

  According to the present invention, there is an effect that light from a backlight light source can be guided to an illumination unit other than the liquid crystal display panel while preventing display quality from being deteriorated by dust.

It is a front view which shows the electronic device provided with the liquid crystal display part. It is a disassembled perspective view which shows the structure of the conventional electronic device. It is sectional drawing which shows the structure of illumination parts other than the liquid crystal display panel in the conventional electronic device. It is a perspective view which shows the other example of the electronic device provided with the liquid crystal display part. It is sectional drawing which shows the structure of illumination parts other than the liquid crystal display panel in the conventional electronic device. It is a disassembled perspective view which shows the structure of the electronic device which concerns on Embodiment 1 of this invention. FIG. 6 is a cross-sectional view illustrating a configuration (part 1) of an illumination unit other than the liquid crystal display panel in the electronic apparatus according to the first embodiment. 6 is a cross-sectional view illustrating a configuration (No. 2) of an illumination unit other than the liquid crystal display panel in the electronic apparatus according to Embodiment 1. FIG. 4 is a cross-sectional view illustrating a configuration example of a light guide shape in the electronic apparatus according to Embodiment 1. FIG. FIG. 10 is a cross-sectional view illustrating another configuration example of a light guide shape in the electronic device according to the first embodiment. 6 is a cross-sectional view showing still another configuration example of the light guide shape in the electronic apparatus according to Embodiment 1. FIG.

Hereinafter, in order to describe the present invention in more detail, modes for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1 FIG.
FIG. 1 is a front view illustrating an electronic apparatus including a liquid crystal display unit. An electronic device 1 illustrated in FIG. 1 is a portable electronic device such as a smartphone having a liquid crystal display unit or a PND (Portable Navigation Device). A protective plate 3 for protecting the liquid crystal display panel is attached to the display surface side case 2 of the electronic device 1. The protective plate 3 is formed with a region corresponding to the display screen 3a and a frame-like region around the display screen 3a on which the back surface is printed with non-transparent coloring.

  In recent portable electronic devices, the screen size of the display screen 3a is increased in order to improve the visibility of the screen and the operability of the touch operation, but in order to ensure the operability of the operation unit other than the display screen 3a, As shown in FIG. 1, the display screen 3a of the liquid crystal display unit and the operation key 3b which is an operation unit other than the display screen 3a may be arranged in the vicinity of the same plane. Even in this configuration, it is necessary to illuminate the operation key 3b in consideration of use in a dark place such as at night.

FIG. 2 is an exploded perspective view showing a configuration of a conventional electronic device, and schematically shows a conventional general configuration of the portable electronic device shown in FIG. As shown in FIG. 2, a conventional portable electronic device 1 ′ includes a display surface side case 2, a liquid crystal display panel 4, a backlight holding frame 5 ′, a light guide plate 6, a backlight holding case 7, and a back side case. 8 is provided.
The display surface side case 2 is a frame housing constituting a design on the display surface side of the electronic device 1 ′, and a protective plate 3 attached to the display surface side of the liquid crystal display panel 4 is disposed. The display surface side case 2 and the back surface side case 8 serve as a housing body of the electronic device 1 ′.

The protection plate 3 is a plate-like member that is formed of a transparent material and protects the display surface of the liquid crystal display panel 4 from the outside. In the protective plate 3, the back surface of the periphery of the display screen 3a is printed in a non-light-transmitting color (for example, black) in a frame shape. The operation key 3b is arranged in the non-translucent color back surface printing area, but the symbol or character portion indicating the contents of the operation key 3b is printed on the back surface and is not folded, and emits illumination light to the outside. can do.
In the following description, the area of the display screen on the protective plate 3 is appropriately referred to as a translucent area 3a, and the area printed on the back surface in a frame shape including a portion where the operation keys are arranged is referred to as a non-translucent area 3b. .

  The liquid crystal display panel 4 is composed of an electrode structure, a color filter, a polarizing plate, and the like for sandwiching a liquid crystal layer between transparent substrates on the display surface side and the back surface side and applying an electric field to the liquid crystal layer. Irradiated to display an image. Further, the liquid crystal display panel 4 is adhered to the protective plate 3 on the display surface side with a transparent adhesive sheet, and the outer peripheral portion on the back surface side is bonded and fixed to the flange portion 5a 'of the backlight holding frame 5'.

The backlight holding frame 5 ′ is a frame in which a flange portion 5a ′ projecting inwardly is formed at the periphery of the frame opening. The light guide plate 6 irradiates light emitted from a backlight light source (not shown in FIG. 2) such as an LED to the back surface of the liquid crystal display panel 4 as diffused light. The backlight holding case 7 is a case that is open on one side and that houses the illumination light source unit including the light guide plate 6.
When the backlight holding frame 5 ′ is attached to the opening of the backlight holding case 7, the flange portion 5 a ′ holds the light guide plate 6 with the backlight holding case 7. An illumination light source unit (not shown except for the light guide plate 6) including a light guide plate 6, various optical sheets, and a light source is provided in a holding casing including a backlight holding frame 5 ′ and a backlight holding case 7. Stored.

FIG. 3 is a cross-sectional view showing a configuration of an illuminating unit other than the liquid crystal display panel in the conventional electronic device, and shows a cross-section in the arrow direction along the line AA in FIG. .
As shown in FIG. 3, a liquid crystal display panel 4 in which a protective plate 3 is attached with a transparent adhesive sheet 3A is disposed on the display surface side of the housing body composed of the display surface side case 2 and the back surface side case 8. On the back surface side of the liquid crystal display panel 4, a holding housing including a backlight holding frame 5 ′ for housing the light guide plate 6 and a backlight holding case 7 is disposed. Further, the outer peripheral portion on the back surface side of the liquid crystal display panel 4 is bonded and fixed to the flange portion 5a ′ by the fixing tape 3A-1.

  When illuminating the operation key 3b, which is an illumination unit other than the liquid crystal display panel 4 (display screen 3a), conventionally, a light source 9 provided separately from the backlight of the liquid crystal display panel 4 is used as shown in FIG. The configuration was common. In this configuration, since the closed space formed by the liquid crystal display panel 4 and the holding housing is not opened to the outside, it is not easily affected by dust. However, as the number of illumination units other than the liquid crystal display panel 4 increases, the number of parts increases accordingly. For this reason, there is a risk of complicating the manufacturing process and increasing the cost of the product.

  FIG. 4 is a perspective view illustrating another example of an electronic apparatus including a liquid crystal display unit. The electronic device 1a illustrated in FIG. 4 is a portable electronic device such as a smartphone or a PND that includes a liquid crystal display unit, as in FIG. The electronic device 1 shown in FIG. 1 illuminates the operation keys 3b around the display screen 3a, but the electronic device 1a shown in FIG. 4 has an exposure illumination unit 10 provided on the outer periphery of the device housing. Yes. In recent portable electronic devices, there is a tendency that the number of illumination units other than the display screen is increased or the area is increased in order to improve design requirements and visibility in a dark place.

FIG. 5 is a cross-sectional view showing a configuration of an illuminating unit other than the liquid crystal display panel in the conventional electronic device, and shows a cross section in the arrow direction along the line AA in FIG.
Since the exposure illumination unit 10 shown in FIG. 4 has a large illumination area, a large number of light sources are required if the configuration shown in FIG. 3 is adopted. Therefore, as in Patent Documents 1 and 2, a configuration in which a backlight light source is used as a light source of an illumination unit other than the liquid crystal display panel 4 has been proposed.
In this configuration, like the light guide plate 6A shown in FIG. 5, the shape of the light guide plate is enlarged in order to guide the light emitted from the light source for backlight to the exposure illumination unit 10. As a result, the backlight light source can be used as the light source of the exposure illumination unit 10, but as shown in FIG. 5, a part of the light guide plate 6A protrudes from the holding housing, and the inside of the holding housing is unavoidably opened to the outside. Is done. For this reason, there is a possibility that dust may enter the space between the liquid crystal display panel 4 and the stored item (light guide plate 6A) in the holding housing facing the liquid crystal display panel 4 to deteriorate the display quality.

  Therefore, the present invention uses a frame (hereinafter referred to as a mold frame) formed of a resin member having translucency instead of the backlight holding frame 5 ′, and provides a light guide shape portion on the mold frame. . The light guide shape portion is formed so as to project outward from the periphery of the frame opening of the mold frame, and the light from the backlight light source guided by the light guide plate 6 is illuminated around the liquid crystal display panel 4. Guide to By doing in this way, the light of the light source for backlight can be guided to illumination parts other than the liquid crystal display panel 4, preventing the deterioration of the display quality by dust.

  FIG. 6 is an exploded perspective view showing the configuration of the electronic device according to the first embodiment of the present invention, and schematically shows the configuration of the electronic device according to the first embodiment. 7 is a cross-sectional view showing a configuration of an illumination unit other than the liquid crystal display panel in the electronic apparatus according to Embodiment 1, and is an electronic apparatus (operation key 3b other than the liquid crystal display panel 4 along line AA in FIG. 1). The cross section of the arrow direction which cut | disconnected the structure which uses as an illumination part is shown. FIG. 8 is a cross-sectional view showing the configuration of the illumination unit other than the liquid crystal display panel in the electronic apparatus according to Embodiment 1, and is an electronic apparatus (exposure illumination other than the liquid crystal display panel 4) along the line AA in FIG. The cross section of the arrow direction which cut | disconnected the structure which uses the part 10 as an illumination part is shown.

As shown in FIG. 6, the electronic device 1 includes a display surface side case 2, a liquid crystal display panel 4, a mold frame 5, a light guide plate 6, a backlight holding case 7, and a back side case 8. The configuration other than the mold frame 5 is the same as that shown in FIG.
The mold frame 5 is formed of a translucent resin member, and includes a flange portion 5a projecting inwardly at the periphery of the frame opening and a light guide shape portion 5b projecting outward at the periphery of the frame opening. Prepare.
By attaching the mold frame 5 to the opening of the backlight holding case 7, the flange portion 5 a holds and holds the light guide plate 6 with the backlight holding case 7.
An illumination light source unit (not shown except for the light guide plate 6) including the light guide plate 6, various optical sheets, and a light source is housed in a holding housing including a mold frame 5 and a backlight holding case 7.

When illuminating the operation key 3b which is an illuminating unit other than the liquid crystal display panel 4 (display screen 3a), the electronic device 1 according to the first embodiment has a translucent mold frame 5 as shown in FIG. The flange portion 5a changes the optical path of a part of the diffused light from the light guide plate 6 toward the light guide shape portion 5b, and the light guide shape portion 5b illuminates a desired illumination portion such as the operation key 3b with this light.
Further, when the outer periphery of the device casing is exposed and illuminated as an illumination unit other than the liquid crystal display panel 4 (display screen 3a), the electronic device 1 according to Embodiment 1 similarly transmits light as shown in FIG. The flange portion 5a of the mold frame 5A formed of a conductive resin member optically converts part of the diffused light from the light guide plate 6 to the light guide shape portion 5b-1 side, and the light guide shape portion 5b-1 The exposure illumination unit 10 is illuminated with light.

  As shown in FIGS. 7 and 8, in the present invention, a frame having the same function as the conventional backlight holding frame 5 ′ is formed of a translucent member, and the periphery of the frame opening of the mold frames 5 and 5A is formed. A light guide shape portion 5b projecting outward is provided to illuminate an illumination portion other than the liquid crystal display panel 4. Thereby, the closed space consisting of the liquid crystal display panel 4 and the holding housing is not opened to the outside, and display quality deterioration due to inflow of dust can be prevented.

FIG. 9 is a cross-sectional view illustrating a configuration example of a light guide shape in the electronic apparatus according to the first embodiment. FIG. 10 is a cross-sectional view illustrating another configuration example of the light guide shape in the electronic apparatus according to the first embodiment. Both have shown the cross section of the arrow direction which cut the electronic device with the AA line of FIG.
A mold frame 5B shown in FIG. 9 includes a flange portion 5a in which a reflection inclined surface 5a-1 is formed on an end surface facing the inside of the holding housing. With this configuration, light traveling from the light guide plate 6 in the direction of the liquid crystal display panel 4 can be optically converted to the light guide shape portion 5b efficiently.
Further, the mold frame 5C shown in FIG. 10 has a reflective slope 5a-1 on the end face facing the inside of the holding housing, and a plurality of reflective slopes on the end face facing the outer peripheral portion on the back side of the liquid crystal display panel 4. The flange part 5a which formed 5a-2 is provided. Even with this configuration, light traveling from the light guide plate 6 in the direction of the liquid crystal display panel 4 can be efficiently converted to the light guide shape portion 5b.

  Further, as shown in FIG. 9, the light guide shape portion 5 b is projected to the vicinity of the back surface of the protective plate 3 (non-translucent region 3 b), and on the surface facing the inner side of the holding housing in the projecting lower portion. A reflective slope 5c may be formed. With this configuration, the light leaking from the transparent adhesive sheet 3A that bonds the protective plate 3 and the liquid crystal display panel 4 is optically converted to the distal end portion of the light guide shape portion 5b facing the illumination portion. Thereby, it is possible to prevent light leakage to an unintended location.

  The part of the mold frame 5 that guides light by the light guide shape part 5b is formed of a white or transparent translucent member, and the other part is formed of a non-translucent member such as black. May be. With this configuration, light is guided only to necessary portions and unnecessary portions are shielded, so that unintended light leakage can be prevented.

  FIG. 11 is a cross-sectional view showing still another configuration example of the light guide shape in the electronic apparatus according to the first embodiment. In FIG. 11, the mold frame 5D uses a frame portion 5D-1 other than the light irradiation portion 5D-2 of the light guide shape portion 5b as a white or transparent translucent resin member, and the light irradiation portion of the light guide shape portion 5b. 5D-2 is molded in two colors as a desired colored translucent resin member. That is, in the mold frame 5D, a portion that illuminates the illumination portion such as the operation key 3b is formed of a translucent colored member, and a portion near the display screen 3a of the liquid crystal display panel 4 is a white or transparent translucent member. It is formed. With this configuration, it is possible to color the illumination color of the operation keys 3b, which are illumination units other than the liquid crystal display panel 4, without affecting the display color of the liquid crystal display panel 4.

As described above, according to the first embodiment, the mold frame 5 is formed to project outward from the peripheral edge of the frame opening, and the light from the backlight light source guided by the light guide plate 6 is displayed on the liquid crystal display. Since the light guide shape part 5b that guides light to the surrounding illumination part of the panel 4 is provided, the operation key that is the illumination part other than the liquid crystal display panel 4 emits light from the backlight light source while preventing deterioration of display quality due to dust. 3b and the exposure illumination part 10 can be guided.
In addition, the luminance of the illumination unit (such as the operation key 3b and the exposure illumination unit 10) other than the liquid crystal display panel 4 is linked to the luminance of the liquid crystal display panel 4, so that the optimum luminance matching the display screen 3a is obtained. become. Thereby, it is not necessary to separately adjust the luminance of the illumination units other than the liquid crystal display panel 4, and the luminance setting unnecessary for the user can be omitted.

  Moreover, according to this Embodiment 1, the flange part 5a reflects the reflective slope (at least one of the reflective slope 5a-1 and the reflective slope 5a-2) which reflects the light from the light-guide plate 6 to the light guide shape part 5b. Therefore, the light traveling in the direction from the light guide plate 6 to the liquid crystal display panel 4 can be efficiently converted into the light guide shape portion 5b.

  Furthermore, according to the first embodiment, the part of the mold frame 5 that guides light by the light guide shape portion 5b is formed of a light transmissive member, and the other part is formed of a non-light transmissive member. Therefore, light is guided by making a necessary part a translucent member, and unnecessary parts are shielded by forming with a non-translucent member, thereby preventing unintended light leakage. Can do.

  Further, according to the first embodiment, since the light guide shape portion 5b is formed of a translucent colored member, the illumination color of the operation keys 3b, which are illumination portions other than the liquid crystal display panel 4, can be set to a desired color. It can be colored.

  In the present invention, any component of the embodiment can be modified or any component of the embodiment can be omitted within the scope of the invention.

  The electronic apparatus according to the present invention can guide the light of the backlight light source to the illumination unit other than the liquid crystal display panel while preventing deterioration of display quality due to dust. It is suitable for a display device of a portable terminal used in the above.

  1, 1a electronic device, 2 display surface side case, 3 protective plate, 3a display screen (translucent area), 3b operation key (non-translucent area), 4 liquid crystal display panel, 5, 5A to 5D mold frame, 5a Flange part, 5a-1, 5a-2, 5c Reflective slope, 5b, 5b-1 Light guide shape part, 5D-1 Frame part, 5D-2 Light irradiation part, 5 'Backlight holding frame, 6, 6A -1 Light guide plate, 7 Backlight holding case, 8 Back side case, 9 Light source, 10 Exposure illumination unit.

In the electronic device according to the present invention, a case having an opening on one side and housing an illumination light source unit including a light guide, and a flange portion projecting inwardly at the periphery of the frame opening are formed. mounting is a holding housing having a frame flange to hold the light guide with the casing, the outer peripheral portion is fixed to the flange portion of the frame, from the light guide light sources by the light guide body In an electronic device provided with a liquid crystal display panel whose back side is illuminated with light, the frame is formed to project outward from the periphery of the frame opening, and the light from the light source guided by the light guide is transmitted to the liquid crystal display panel. A light guide shape part for guiding light to the surrounding illumination part is provided.

The liquid crystal display panel 4, a liquid crystal layer sandwiched between a transparent substrate on the display surface side and the back side, the electrode structure for applying an electric field to the liquid crystal layer, a color filter, is constituted by a polarizing plate, the backlight from the back side Irradiated to display an image. Further, the liquid crystal display panel 4 is attached to the protective plate 3 on the display surface side with a transparent adhesive sheet, and the outer peripheral portion on the back surface side is bonded and fixed to the flange portion 5a ′ of the backlight holding frame 5 ′.

The backlight holding frame 5 ′ is a frame in which a flange portion 5a ′ projecting inwardly is formed at the periphery of the frame opening. The light guide plate 6 irradiates light emitted from a backlight light source (not shown in FIG. 2) such as an LED to the back surface of the liquid crystal display panel 4 as diffused light. The backlight holding case 7 is a case that is open on one side and that houses the illumination light source unit including the light guide plate 6.
'When attaching the the opening of the backlight holding case 7, the flange portion 5a' backlight holding frame 5, a light guide plate 6 in between the backlight holding case 7 for holding and clamping. An illumination light source unit (not shown except for the light guide plate 6) including a light guide plate 6, various optical sheets, and a light source is provided in a holding casing including a backlight holding frame 5 ′ and a backlight holding case 7. Stored.

As shown in FIG. 6, the electronic device 1 includes a display surface side case 2, a liquid crystal display panel 4, a mold frame 5, a light guide plate 6, a backlight holding case 7, and a back side case 8. The configuration other than the mold frame 5 is the same as that shown in FIG.
The mold frame 5 is formed of a translucent resin member, and includes a flange portion 5a projecting inwardly at the periphery of the frame opening and a light guide shape portion 5b projecting outward at the periphery of the frame opening. Prepare.
By mounting the mold frame 5 at the opening of the backlight holding case 7, a flange portion 5a, the light guide plate 6 in between the backlight holding case 7 for holding and clamping.
An illumination light source unit (not shown except for the light guide plate 6) including the light guide plate 6, various optical sheets, and a light source is housed in a holding housing including a mold frame 5 and a backlight holding case 7.

Claims (4)

A case having an opening that houses an illumination light source unit including a light guide, and a flange portion projecting inwardly at a peripheral edge of the frame opening, are attached to the opening portion of the case, and the flange portion A holding housing having a frame for sandwiching the light guide body with the case;
In an electronic device provided with a liquid crystal display panel in which an outer peripheral portion is fixed to the flange portion of the frame and the back side is illuminated with light from a light source guided by the light guide,
The frame is
A light guide shape portion that is formed to project outward from a peripheral edge of the frame opening and guides light from a light source guided by the light guide to an illumination portion around the liquid crystal display panel; Features electronic equipment.   The electronic apparatus according to claim 1, wherein the flange portion has a reflective slope that reflects light from the light guide to the light guide shape portion.   2. The electron according to claim 1, wherein a portion of the frame that guides light by the light guide shape portion is formed of a translucent member, and the other portion is formed of a non-translucent member. machine.   The electronic apparatus according to claim 1, wherein the light guide shape portion is formed of a translucent colored member.

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