JP5178427B2 - Display device and electronic apparatus - Google Patents

Description

  The present invention relates to a display device and an electronic apparatus that can improve visual effects such as illumination of a back surface of a mobile phone.

  Many mobile phones have a foldable housing. In such a mobile phone, not only the main liquid crystal display device provided inside the housing, but also the outside of the housing is used for LED design, LED display panel, or organic EL panel for improving design and play. A device that is mounted with a simple display device such as a backlight and displays information is widely used.

  Conventionally, for example, Patent Document 1 proposes a two-fold type portable terminal device in which a panel member that is partially transparent or translucent is detachably mounted on a surface emitting member outside the casing. . In this portable terminal device, a panel member installed on the surface light emitting unit is illuminated by the surface light emitting unit, so that a transparent or semi-transparent pattern applied to the panel member is displayed by light emission.

Japanese Patent Laying-Open No. 2004-80391 (Claims, FIG. 7)

However, the following problems remain in the conventional technology.
The technique described in Patent Document 1 has a disadvantage that the content of the light-emitting display cannot be changed unless the panel member is replaced. For this reason, the illumination pattern is limited to one by only one panel member, and the visual effect by another pattern cannot be obtained. In recent years, there has been a demand for further improvement in design using more various visual effects, particularly for the backside illumination of mobile phones and the like. Further, when the panel member as the cover member is removed for replacement, the light emitting part structure such as a light guide plate arranged inside is revealed and directly touched by the user.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a display device and an electronic apparatus that can obtain various visual effects without replacing a cover member.

  The present invention employs the following configuration in order to solve the above problems. That is, the display device of the present invention includes a first light source and the first light source arranged on an end surface which is a light incident surface, and optical path conversion is performed on the light incident and guided from the first light source to the main surface side. The first light guide plate that emits in a planar shape, the second light source, and the first light guide plate are arranged above the first light guide plate, and the second light source is arranged on an end surface that is a light incident surface. A second light guide plate that changes the optical path of the light that is incident and guided from the light source and emits the light from the main surface side in a planar shape, and a portion disposed between the first light guide plate and the second light guide plate And a light shielding sheet having a sheet light transmission region which is a hole, a transparent part or a translucent part having a predetermined shape.

  The display device includes a light shielding sheet that is disposed between the first light guide plate and the second light guide plate and has a sheet light transmission region that is a hole having a predetermined shape, a transparent portion, or a translucent portion. Therefore, when the first light guide plate is illuminated, when the second light guide plate is illuminated, and when both the first light guide plate and the second light guide plate are further illuminated, the cover member is replaced. A high visual effect can be obtained with at least three types of illumination patterns. That is, when only the first light guide plate is illuminated by driving the first light source, the light that has passed through the sheet light transmission region of the light shielding sheet is also transmitted through the second light guide plate and emitted to the main surface side. The light is displayed as a pattern or the like above in the shape of the transmissive region. In addition, when the second light source is driven to light only the second light guide plate, the entire main surface of the second light guide plate emits light. Further, when the first light source and the second light source are driven to cause both the first light guide plate and the second light guide plate to emit light, the light in the shape of the sheet light transmission region and the surface light emission by the second light guide plate It is possible to emit light with an illumination pattern combined with. In addition, it is also possible to obtain more various illuminations by causing the first light source and the second light source to emit light of different colors.

  In the display device of the present invention, an outer cover member that covers the upper surface of the second light guide plate and has a cover light transmission region that is at least partially transparent or translucent including directly above the sheet light transmission region. It is characterized by having. That is, in this display device, since at least a part including just above the sheet light transmission region includes an outer cover member having a transparent or translucent cover light transmission region, when the first light guide plate is illuminated, The outer cover member is illuminated through the sheet light transmission region and the second light guide plate, and the shape of the sheet light transmission region can be raised in the cover light transmission region. Further, when the second light guide plate is illuminated, the entire cover light transmission region of the outer cover member can be illuminated, and the pattern or the like applied to the cover light transmission region can be raised. Furthermore, when both the first light guide plate and the second light guide plate are illuminated, both the shape of the sheet light transmission region and the pattern applied to the cover light transmission region can be raised in the cover light transmission region. .

  In the display device of the present invention, an upper surface of the light shielding sheet other than the sheet light transmission region is a reflective surface. That is, in this display device, since the upper surface of the light shielding sheet other than the sheet light transmission region is a reflective surface, when the second light guide plate is illuminated, the light is emitted from the second light guide plate to the light shielding sheet side. The high brightness of the second light guide plate can be obtained by reflecting the reflected light back by the light shielding sheet.

  In the display device of the present invention, at least one of the first light guide plate and the second light guide plate has a light guide area divided into a plurality of holes or slits, and the first light source and the A plurality of at least one of the second light sources is arranged on the end face corresponding to each light guide area, and brightness or emission color can be set for each light guide area. That is, in this display device, at least one of the first light source and the second light source is arranged in a plurality corresponding to each light guide area on the end surface of the corresponding first light guide plate or second light guide plate. At the same time, since the luminance or emission color can be set for each light guide area, surface emission display can be performed with different luminance or emission color for each light guide area, and more various visual effects can be obtained.

  In addition, the display device of the present invention includes a light transmission region changing mechanism capable of changing the sheet light transmission region. That is, since this display device includes a light transmission region changing mechanism that can change the sheet light transmission region, the light transmission display is performed above the second light guide plate by switching the sheet light transmission region by the light transmission region change mechanism. The illumination pattern according to the sheet light transmission region to be changed can be changed.

  Furthermore, the display device of the present invention is characterized in that the light transmission region changing mechanism includes a pair of rollers in which both end sides of the light shielding sheet are wound, and a drive unit that rotationally drives these rollers. To do. That is, in this display device, a pair of rollers are driven to rotate by the drive unit, and the portion of the light shielding sheet disposed on the first light guide plate is wound around one roller and wound around the other roller. By moving the portion of the light shielding sheet that is on the first light guide plate, the sheet light transmission region disposed on the first light guide plate can be easily changed.

  An electronic apparatus according to the present invention includes the display device according to the present invention. That is, since this electronic apparatus includes the display device of the present invention having a plurality of illumination patterns, a good aesthetic appearance can be caused by various visual effects for the user of the apparatus.

  The electronic device of the present invention is a mobile phone including the display device outside a foldable casing. Since the mobile phone is provided with the display device of the present invention on the outside of the foldable casing, even in the folded state, a light-emitting display is performed on the outside of the casing with different illumination patterns depending on the situation of the telephone such as reception. Is possible.

The present invention has the following effects.
That is, according to the display device according to the present invention, a sheet light transmission region that is disposed between the first light guide plate and the second light guide plate and is a hole, a transparent portion, or a translucent portion having a predetermined shape in part. Therefore, a high visual effect can be obtained with at least three types of illumination patterns without replacing the cover member.
Therefore, in an electronic device such as a cellular phone provided with the display device of the present invention, high design can be obtained with various visual effects by the combination of the first light guide plate, the light shielding sheet, and the second light guide plate. At the same time, a better aesthetic appearance can be caused to the user of the device.

  Hereinafter, a display device and an electronic apparatus according to a first embodiment of the present invention will be described with reference to FIGS. In each drawing used in the following description, the scale is appropriately changed to make each member a recognizable size.

  As shown in FIGS. 1 and 2, the display device 1 according to the present embodiment includes a plurality of first light sources 2 that are LED light sources and the first light sources 2 arranged on an end surface 3 a that is a light incident surface. A first light guide plate 3 that changes the optical path of light incident and guided from one light source 2 and emits the light from the main surface side in a planar shape, a plurality of second light sources 4 that are LED light sources, and a first light guide. Arranged above the optical plate 3, the second light source 4 is disposed on the end surface 5a which is a light incident surface, and the light incident and guided from the second light source 4 is converted into an optical path and emitted in a planar shape from the main surface side. A sheet light transmission region 6a, which is a hole, a transparent part, or a semi-transparent part having a predetermined shape, is arranged between the second light guide plate 5, the first light guide plate 3, and the second light guide plate 5. The light shielding sheet 6 and the upper surface of the second light guide plate 5 are covered, and at least a part including the portion directly above the sheet light transmission region 6a is transparent. Or an outer cover member 7 having a translucent cover light transmission region 7a, and includes a first light source 2 and the light source control unit 8 that drives and controls the light emission of the second light source 4, a.

In addition, the electronic device provided with the display device 1 of the present embodiment is a foldable mobile phone (electronic device) 9 as shown in FIGS. 3 and 4, and is provided outside the casing 10 of the mobile phone 9. A display surface of the display device 1 is arranged.
In the present embodiment, the display surface side of the display device 1 is described as the upper surface side.

A reflective sheet 12 is bonded and fixed to the lower surface of the second light guide plate 5 via a double-sided tape 11. The first light guide plate 3, the light shielding sheet 6, and the second light guide plate 5 are bonded and fixed to each other with a double-sided tape 11.
The plurality of first light sources 2 and second light sources 4 are mounted and installed on a flexible printed circuit board (not shown).
The first light source 2 and the second light source 4 are electrically connected to the light source control unit 8 through a flexible printed board.

The first light source 2 and the second light source 4 are, for example, side-emitting white LEDs that can emit light toward the end surfaces 3a and 5a that are incident surfaces of the first light guide plate 3 and the second light guide plate 5. It is.
These white LEDs are, for example, semiconductor light-emitting elements on a substrate sealed with a resin material. As semiconductor light-emitting elements, for example, blue (wavelength λ: 470 to 490 nm) LED elements or ultraviolet light (wavelength λ: less than 470 nm) ) An LED element, which is formed by laminating a plurality of semiconductor layers of a gallium nitride compound semiconductor (for example, an InGaN compound semiconductor) on an insulating substrate such as a sapphire substrate.

  Further, the resin material for sealing the semiconductor light emitting element is mainly composed of a silicone resin and, for example, a YAG phosphor is added. This YAG phosphor converts white light or ultraviolet light from a semiconductor light emitting element into yellow light and generates white light by a color mixing effect. Various white LEDs other than those described above can be used.

  The first light source 2 and the second light source 4 are arranged on different end face sides. That is, the end surface 3a of the first light guide plate 3 on which the first light source 2 is disposed and the end surface 5a of the second light guide plate 5 on which the second light source 4 is disposed are arranged on opposite sides. As a result, the first light source 2 and the second light source 4 do not interfere with each other, and the overall thickness can be reduced.

The first light guide plate 3 and the second light guide plate 5 are made of, for example, a translucent resin material, and receive light from the first light source 2 or the second light source 4 incident from the end surfaces 3a and 5a thereof. It is a thin plate-shaped or sheet-shaped thin light guide plate that guides light and changes the optical path to emit planar illumination light upward from its main surface (upper surface in the present embodiment).
A plurality of fine optical shapes that perform optical path conversion such as convex dots and prisms may be formed on the surfaces of the first light guide plate 3 and the second light guide plate 5.

As described above, the light shielding sheet 6 is formed with the sheet light transmission region 6a. For example, in the present embodiment, a plurality of sheet light transmission regions 6a which are circular and star cutout holes are formed.
The light shielding sheet 6 is a reflective sheet whose upper surface other than the sheet light transmission region 6a is a reflective surface. Note that the lower surface of the light shielding sheet 6 may also be a reflective surface. The light shielding sheet 6 and the reflection sheet 12 are a metal plate, a film, a foil, or the like having a light reflection function. In the present embodiment, a film provided with a silver vapor deposition film is employed. Note that an aluminum metal vapor deposition film or the like may be employed instead of the silver vapor deposition film.

  The outer cover member 7 is made of, for example, a translucent resin material, and is fitted into the outer window portion of the housing 10. In addition, the entire outer cover member 7 of this embodiment is a cover light transmission region 7a, and a pattern E is applied to the front or back surface of the cover light transmission region 7a by printing or the like.

  The light source control unit 8 turns on the first light source 2 to raise the sheet light transmission region 6a by the first light guide plate 3 and turns on the second light source 4 to turn on the surface by the second light guide plate 5. The case of emitting light is set according to the state and operation of the mobile phone 9. For example, when a specific button of the cellular phone 9 is pressed, as shown in FIG. 3, the second light source 4 is turned on, the second light guide plate 5 is surface-emitted, and the pattern E is displayed on the cover light transmission region 7a. Is displayed. That is, when the second light source 4 is driven to light only the second light guide plate 5, the entire main surface of the second light guide plate 5 is surface-emitted and the pattern E applied to the cover light transmission region 7a is illuminated. To emerge.

  Further, when another specific button is pressed, as shown in FIG. 4, control is performed so that the sheet light transmission region 6a is raised to the cover light transmission region 7a so that circular and star-shaped patterns shine. That is, when only the first light guide plate 3 is illuminated by driving the first light source 2, the light transmitted through the sheet light transmission region 6 a of the light shielding sheet 6 is also transmitted through the second light guide plate 5 and the outer cover member 7. The sheet light transmission region 6a is displayed as a pattern on the upper cover light transmission region 7a.

  Further, when another specific button is pressed, both the first light source 2 and the second light source 4 are turned on, and both the pattern E and the pattern by the sheet light transmission region 6a are displayed in the cover light transmission region 7a. Control the display. That is, when the first light source 2 and the second light source 4 are driven to cause both the first light guide plate 3 and the second light guide plate 5 to emit light, the pattern and the second light guide are formed according to the shape of the sheet light transmission region 6a. It is possible to perform light emission display with an illumination pattern that is combined with the pattern E raised by surface light emission by the light plate 5.

Further, when the mobile phone 9 is in a standby state, control may be performed so that only the first light source 2 is turned on, and control may be performed so that the second light source 4 repeats blinking when an incoming call is received. Absent.
In addition, you may employ | adopt LED of the luminescent color which mutually differs with the 1st light source 2 and the 2nd light source 4. FIG. In this case, it is possible to obtain more various illuminations by causing the first light source 2 and the second light source 4 to emit light with different colors. For example, illumination by mixed color light is also possible by causing both the first light source 2 and the second light source 4 to emit light simultaneously.

  As described above, the light source control unit 8 is configured to illuminate the specific shape of the sheet light transmission region 6a, the surface emitting illumination by the second light guide plate 5, and the illumination by both according to the manual operation or the state of the mobile phone 9. The three types of patterns are selected and displayed.

  As described above, in the display device 1 according to the present embodiment, sheet light which is arranged between the first light guide plate 3 and the second light guide plate 5 and is a hole, a transparent portion or a translucent portion having a predetermined shape in part. Since the light-shielding sheet 6 having the transmissive region 6a is provided, the first light guide plate 3 and the second light guide plate 3 and the second light guide plate 3 and the second light guide plate 5 are illuminated. When both of the light plates 5 are illuminated, a high visual effect can be obtained with at least three types of illumination patterns without replacing the cover member.

  In addition, since at least a part including the portion directly above the sheet light transmission region 6a includes the outer cover member 7 having the transparent or semi-transparent cover light transmission region 7a, the sheet is lit when the first light guide plate 3 is illuminated. The outer cover member 7 is illuminated through the light transmission region 6a and the second light guide plate 5, and a pattern or the like due to the shape of the sheet light transmission region 6a can be raised in the cover light transmission region 7a. Further, when the second light guide plate 5 is illuminated, the entire cover light transmission region 7a of the outer cover member 7 is illuminated, and the pattern E applied to the cover light transmission region 7a can be raised. Further, when both the first light guide plate 3 and the second light guide plate 5 are illuminated, both the pattern by the shape of the sheet light transmission region 6a and the pattern E applied to the cover light transmission region 7a are covered with the cover light transmission region. 7a can be raised.

  Further, since the upper surface of the light shielding sheet 6 other than the sheet light transmission region 6a is a reflective surface, the light is emitted from the second light guide plate 5 to the light shielding sheet 6 side when the second light guide plate 5 is illuminated. The high brightness of the second light guide plate 5 can be obtained by reflecting the reflected light back by the light shielding sheet 6.

  Therefore, the cellular phone 9 including the display device 1 can perform light-emitting display on the outside of the housing 10 with a different illumination pattern depending on the status of the phone such as reception even in a folded state.

  Next, second and third embodiments of the display device and the electronic apparatus according to the present invention will be described below with reference to FIGS. In the following description of each embodiment, the same constituent elements described in the above embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  The difference between the second embodiment and the first embodiment is that, in the first embodiment, when the second light source 4 is turned on, the entire second light guide plate 5 is similarly illuminated. In the display device 21 and the mobile phone 29 of the second embodiment, as shown in FIGS. 5 to 8, the second light guide plate 25 has a light guide area 25b divided into a plurality of long holes 25a. A plurality of the second light sources 24 are arranged on the end face 25a corresponding to each light guide area 25b, and the light source controller 8 can set the luminance or the light emission color for each light guide area 25b.

  In the second embodiment, RGB-LEDs are employed as the second light source 24, and it is possible to emit light of any color and cause surface light emission for each light guide area 25b. For example, as the RGB-LED, an LED in which a red LED element (R), a green LED element (G), and a blue LED element (B) are mounted in one package may be used as the second light source 24. In this case, it is possible to emit light in various colors by controlling the applied current in each LED.

Further, by adopting RGB-LEDs for the first light source 2 as well, it is possible to make a pattern or the like having the shape of the sheet light transmission region 6a appear in the cover light transmission region 7a with light of any color.
In FIG. 5, the second light guide plate 25 is simply illustrated and divided into four light guide areas 25 b, but the second light guide plate 25 when mounted on the mobile phone 29 is shown in FIG. As shown in FIG. 7, it is divided into seven light guide areas 25b.

  In the second embodiment, as shown in FIG. 7, the light source controller 8 changes the emission color of the second light source 24 corresponding to each of the seven light guide areas 25b, for example, and the light guide areas 25b have different colors. Is controlled so that the second light guide plate 25 emits light in seven colors, and at the same time, the first light source 2 is turned on with white light and the sheet light transmission region 6a is illuminated in an illumination mode (seven color mode). To do.

As another mode, as shown in FIG. 8, the light source control unit 8 causes the first light source 2 to emit all white light and at the same time does not turn on the second light source 24 (white mode). You may control to display with.
In this way, the light source control unit 8 drives and controls the first light source 2 and the second light source 24 by selecting either the seven-color mode or the white mode according to the operation of the mobile phone 29 or the reception status. .

A plurality of slits may be provided instead of the long holes 25a, and the second light guide plate 25 may be divided into a plurality of light guide areas 25b by each slit.
Further, the outer cover member 27 of the second embodiment is not particularly provided with a pattern or the like, but may be provided with a pattern or the like as in the first embodiment.

  As described above, in the display device 21 according to the second embodiment, a plurality of the second light sources 4 are arranged on the end surface 25a of the second light guide plate 25 corresponding to each light guide area 25b and each light guide area 25b. Since the luminance or emission color can be set, the surface emission display can be performed with different luminance or emission color for each light guide area 25b, and more various visual effects can be obtained. Therefore, according to this display device 21, different areas and patterns can be illuminated with different colors and timings.

  The difference between the third embodiment and the first embodiment is that, in the first embodiment, the light shielding sheet 6 is fixed between the first light guide plate 3 and the second light guide plate 5, and the sheet light transmission region. While the shape of 6a cannot be changed, the display device 31 of the third embodiment includes a light transmission region changing mechanism 39 that can change the sheet light transmission region 6a as shown in FIG. Is a point.

The light transmission region changing mechanism 39 is a movable mechanism including a pair of rollers 32 around which both end sides of the light shielding sheet 36 are wound, and a driving unit 33 such as a motor that rotationally drives the rollers 32.
The light shielding sheet 36 is not fixed with a double-sided tape so as to be movable on the second light guide plate 5 along the second light guide plate 5.

  In the display device 31 according to the third embodiment, the pair of rollers 32 is rotationally driven by the drive unit 33, and the portion of the light shielding sheet 36 disposed on the first light guide plate 3 is wound around the one roller 32. At the same time, by moving the portion of the light shielding sheet 36 wound around the other roller 32 to the first light guide plate 3, the sheet light transmission region 6a disposed on the first light guide plate 3 is made different. It can be easily changed. As described above, since the light shielding sheet 36 disposed on the first light guide plate 3 moves inside and changes the sheet light transmission region 6a, the design is changed and displayed without revealing the light emitting unit structure. be able to. Therefore, since the pattern according to the shape of the sheet light transmission region 6a can be easily changed, the user's preference can be satisfied more.

  In addition, this invention is not limited to said each embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.

  For example, in each of the above embodiments, the entire outer cover member is a transparent or translucent cover light transmission region, but a part is a cover light transmission region, and printing or the like is performed in addition to the cover light transmission region. It may be applied and shielded from light. Further, the shape of the cover light transmission region itself may be a pattern or the like. Even in these cases, the cover light transmission region is disposed at least immediately above the sheet light transmission region.

  Further, in the second embodiment, the second light guide plate has a light guide area divided into a plurality of parts, and the second light source is controlled correspondingly, but also for the first light guide plate, A plurality of light guide areas divided into a plurality of long holes and slits are provided, and a plurality of first light sources are arranged on the end surface corresponding to each light guide area, and each light guide area is controlled by a light source control unit. Luminance or emission color may be settable. In this way, not only the second light guide plate but also the first light guide plate is divided into a plurality of light guide areas and the first light source is controlled, so that more various visual effects can be obtained. Note that even when only the first light guide plate is divided into a plurality of light guide areas, it is possible to obtain a different visual effect than when only the second light guide plate is divided into a plurality of light guide areas.

  In the third embodiment, the light transmission region is changed by moving the light shielding sheet by the light transmission region changing mechanism using a roller or a drive unit. However, other changing means may be used. For example, a light transmission region changing mechanism may be employed in which the side of the housing can be opened and exchanged by inserting and removing the light shielding sheet from the side of the housing without removing the outer cover member.

  In each of the above embodiments, the display device is provided with the display surface facing the outside of the casing of the mobile phone. However, the display device may be provided in another location. For example, the display device of the present invention may be installed instead of the backlight that is normally installed at the bottom of the liquid crystal display panel. In this case, various visual effects can be obtained by changing the illumination pattern of the display device according to the display of the liquid crystal display panel serving as the outer cover member.

  Further, in each of the above embodiments, the display device of the present invention is provided in a foldable mobile phone, but it may be mounted in another type of mobile phone. For example, the display device of the present invention may be mounted on the back surface of a so-called candy bar type (straight type) mobile phone or a slide type mobile phone.

Moreover, although it is preferable to employ | adopt LED light sources as a 1st light source and a 2nd light source, you may employ | adopt other light sources, such as a fluorescent lamp.
Further, the display device of the present invention is mounted on a mobile phone, but may be adopted in other electronic devices such as a PDA, a notebook personal computer (notebook PC), and an electronic dictionary. Furthermore, the display device of the present invention may be used alone such as a wall-mounted display or a signboard.

1 is a plan view showing a display device in a first embodiment of a display device and an electronic apparatus according to the present invention. It is AA arrow sectional drawing of FIG. In 1st Embodiment, it is a perspective view which shows the mobile telephone at the time of making only the 2nd light source light and making it surface-emit. In 1st Embodiment, it is a perspective view which shows the mobile telephone at the time of lighting only the 1st light source and making it light-emit. In 2nd Embodiment of the display apparatus and electronic device which concern on this invention, it is a top view which shows a display apparatus. FIG. 6 is a cross-sectional view taken along line B-B in FIG. 5. In 2nd Embodiment, it is a top view which shows a mobile telephone when a light-guide plate is made to light-emit in seven color mode. In 2nd Embodiment, it is a top view which shows a mobile telephone when a light-guide plate is made to light-emit in white mode. In 3rd Embodiment of the display apparatus and electronic device which concern on this invention, it is simplified sectional drawing which shows a display apparatus.

Explanation of symbols

  1, 2, 31 ... Display device, 2 ... First light source, 3 ... First light guide plate, 4, 24 ... Second light source, 5, 25 ... Second light guide plate, 6, 36 ... Light shielding sheet, 6a ... sheet light transmission region, 7 ... outer cover member, 7a ... cover light transmission region, 9, 29 ... mobile phone (electronic device), 10 ... housing, 25a ... long hole, 25b ... light guide area

Claims (7)

A first light source;
A first light guide plate that arranges the first light source on an end surface that is a light incident surface, converts the light that is incident and guided from the first light source, and emits the light from the main surface side in a planar shape;
A second light source;
Arranged above the first light guide plate, the second light source is arranged on an end surface which is a light incident surface, and the light guided from the second light source and guided is converted into a plane shape from the main surface side. A second light guide plate that emits to
A light-shielding sheet that is disposed between the first light guide plate and the second light guide plate and has a sheet light transmission region that is a hole, a transparent part, or a translucent part of a predetermined shape in part ,
A display device comprising: a light transmission region changing mechanism capable of changing the sheet light transmission region . The display device according to claim 1,
The light transmission region changing mechanism, a pair of rollers around which both ends of the light shielding sheet are wound,
And a drive unit that rotationally drives these rollers . The display device according to claim 1 or 2 ,
An outer cover member that covers an upper surface of the second light guide plate and includes at least a part of the cover light transmission region that is transparent or translucent including at least a portion directly above the sheet light transmission region is provided. Display device. The display device according to any one of claims 1 to 3 ,
An upper surface of the light shielding sheet other than the sheet light transmission region is a reflective surface. The display device according to any one of claims 1 to 4 ,
At least one of the first light guide plate and the second light guide plate has a light guide area divided into a plurality of holes or slits,
A plurality of at least one of the first light source and the second light source are arranged on the end face corresponding to each light guide area, and brightness or emission color can be set for each light guide area. A display device. An electronic apparatus comprising the display device according to any one of claims 1 to 5 . The electronic apparatus according to claim 6 , wherein the electronic apparatus is a mobile phone including the display device outside a foldable casing.

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