JP5828687B2 - Display light guide plate and display device including display light guide plate - Google Patents

Description

  The present invention relates to a display light guide plate and a display device including the display light guide plate.

  There is known a display device in which a plurality of light guide plates having diffusion dots such as letters and figures are overlapped and a light source is attached to each light guide plate (for example, Patent Document 1). According to this display device, by switching the light source, it is possible to display display information such as one character or graphic of each light guide plate. Thereby, in the same display device, different information can be displayed only by switching the light source.

JP 2008-299116 A

  However, when a plurality of light guide plates having diffusion dots for displaying information such as characters and figures are stacked, if the diffusion dots of the respective light guide plates arranged on the front and back are overlapped, the diffusion dots of the light guide plate on the back side are overlapped. There is a problem that it is difficult to see due to being hidden by the diffusion dots of the light guide plate on the surface side. In addition, the light diffused from the light guide plate on which the light is incident enters the diffusion dots of the other light guide plates, and characters and figures on the other light guide plates that are not desired to be displayed are blurred. It was.

  The present invention has been made in view of such a problem, and a display light guide plate and a display device including the display light guide plate capable of displaying display information of a light guide plate on which light is incident more clearly. The main purpose is to provide

  The present invention adopts the following means in order to achieve the main object described above.

The display light guide plate of the present invention has a plurality of diffusion lines or a plurality of diffusion dots arranged on the back surface to represent display information and formed inside the outline of the display information. A plurality of light guide plates that display the display information of the diffusion lines or the diffusion dots by diffusing and mainly leading out from the surface,
When the light guide plate is viewed from the front side, all the diffusion lines or the diffusion dots of the light guide plate are arranged on the front side or the back side of the adjacent light guide plates. It is characterized by being arranged directly or with a gap so as not to overlap with each other.

  This display light guide plate has a plurality of diffusion lines or a plurality of diffusion dots (hereinafter also simply referred to as “diffusion lines etc.”) inside the outline of the display information, and displays desired display information by the diffusion lines. A plurality of light guide plates are provided. By making light incident on one of the light guide plates from the side surface, it is refracted by a diffusion line or the like, and display information of the light guide plate on which the light is incident can be displayed on the surface side. The display light guide plate of the present invention includes a diffusion line provided on a light guide plate on which light is incident, a diffusion line provided on an adjacent light guide plate disposed on the front surface side or the back surface side of the light guide plate, and the like. However, they are arranged so as not to overlap each other when viewed from the front side. By doing so, the incident light diffused by the diffusion lines or the like is not incident on the front side or the rear side compared to the case where the respective diffusion lines on the front side and the back side overlap when viewed from the front side. The possibility of entering a diffusion line or the like of the adjacent light guide plates arranged can be reduced. That is, the possibility of displaying display information on a light guide plate other than the incident light guide plate can be reduced. In addition, diffusion lines and the like are generally processed by various processing methods such as machining, laser processing, and ultrasonic processing, but the bottom surfaces of the diffusion lines and the like are roughened to improve the visibility of light. It is often formed with. Therefore, the light from the diffusion line or the like of the light guide plate arranged on the back side overlaps with the diffusion line or the like on the front side and is difficult to visually recognize. However, the display light guide plate of the present invention includes a diffusion line provided on the light guide plate on which light is incident and a diffusion line provided on an adjacent light guide plate disposed on the front side or the back side of the light guide plate. Are arranged so that they do not overlap each other when viewed from the front side, so that the diffusion lines of the light guide plate on the back side are prevented from overlapping with the diffusion lines on the front side and becoming difficult to see. Can do. Here, the “display information” of the present invention refers to a representation of characters, symbols, figures, patterns, etc., by a combination of a plurality of diffusion lines and the like. The “contour” of the display information refers to the outer edge of the information to be displayed. The “diffusion line or a plurality of diffusion dots formed inside the contour” means a diffusion line or the like arranged inside the contour of the display information to be displayed, and does not include a contour groove described later. In addition, it is not always necessary that there is a groove in the outline, and it is only necessary that the outline exists within the outline of characters, symbols, graphic patterns, etc. that are to be expressed as display information. The “diffusion line” refers to a diffusion region formed in a linear shape. For example, a diffusion groove formed in a groove shape, a convex linear portion formed by screen printing, or the like can be considered. A diffusion dot means the recessed part and convex part which were formed in dot shape.

  In the display light guide plate of the present invention, the plurality of diffusion lines or the plurality of diffusion dots may be regularly arranged. By using regularly arranged diffusion lines, etc., all of the diffusion lines of the light guide plate on the front surface side or the diffusion lines of the light guide plate on the back surface side are shifted by a certain distance from the front side. When visually recognized, the diffusion lines and the like provided on the adjacent light guide plates arranged on the front surface side or the back surface side are alternately arranged. That is, the diffusion lines of the light guide plates on the front surface side and the diffusion lines of the light guide plates on the back surface side are arranged so as not to overlap each other. By using diffusion lines and the like that are regularly arranged in this manner, a display light guide plate having diffusion lines and the like that do not overlap all can be easily manufactured.

  In the light guide plate for display according to the present invention, the intervals between the plurality of diffusion lines or the plurality of diffusion dots are formed wider than the width of the diffusion lines or the width of the diffusion dots, and the light guide plate is viewed from the front side. In this case, all of the diffusion lines or the diffusion dots of the light guide plate may be arranged so as to be visible apart from each other. By adopting such a configuration, a diffusion line or the like provided on a light guide plate on which light is incident and a diffusion line or the like provided on an adjacent light guide plate disposed on the front surface side or the back surface side of the light guide plate A blank area can be provided in between. As a result, compared with the case where there is no blank area, even if the light refracted from the diffusion line or the like of the light guide plate on which the light is incident diffuses to spread slightly, the diffusion provided in the adjacent light guide plate The possibility of entering the line can be further reduced. That is, the possibility of displaying display information on a light guide plate other than the incident light guide plate can be reduced. In addition, even if some diffused incident light is incident on the diffusion line of the adjacent light guide plate, there is a blank area, so that the boundary of the diffusion line of the light guide plate on which the light is incident can be easily recognized, and the display information is clarified. It becomes easy to recognize. Further, the presence of the blank region hides the diffusion line on the back side by the diffusion line on the front side even when viewed from a direction other than the planned viewing direction (for example, the direction seen from the front). The possibility can be reduced.

  In the display light guide plate of the present invention, a contour groove representing a contour of display information may be provided around the diffusion line or the diffusion dot. By adopting such a configuration, it is possible to clearly display the outline of the display information displayed by a diffusion line or the like. Therefore, it can be set as the light guide plate for display which makes it easy for a viewer to understand display information.

  In the light guide plate for display according to the present invention, when the plurality of diffusion lines or the plurality of diffusion dots of the light guide plate disposed on the front surface side are viewed from the front surface side, the guides disposed on the back surface side adjacent to each other. The light derived from the plurality of diffusion lines or the plurality of diffusion dots of the light plate may be disposed at a position other than the derived range derived from the light guide plate disposed on the surface side. This display light guide plate is such that the light bent from the diffusion line of the light guide plate arranged on the back surface side is not provided with a diffusion line or the like in the lead-out range where the light is derived from the surface of the light guide plate on the front side. is there. By doing so, it is possible to further reduce the possibility that the incident light diffused by the diffusion line or the like enters the diffusion line or the like of the adjacent light guide plate arranged on the front surface side or the back surface side. Further, it is possible to further reduce the possibility that the diffusion line or the like on the back side is hidden by the diffusion line or the like on the front side.

  In the display light guide plate of the present invention, the diffusion line may be formed of a diffusion groove. By adopting a means called a diffusion groove as the diffusion line, it can be processed by laser processing, machining, or the like, and the diffusion line can be easily produced.

  The display device of the present invention is a display device including any one of the above-described display light guide plates and a plurality of LED light sources that receive irradiation light from the side surfaces corresponding to the plurality of light guide plates. According to this display device, since any one of the display light guide plates described above is provided, the same effect as that of the display light guide plate described above, for example, incident light refracted by a diffusion line or the like is on the front side or the back side. The effect that it is possible to reduce the possibility of being incident on a diffusion line or the like of adjacent light guide plates disposed on the side can be obtained.

  In the display device of the present invention, the plurality of LED light sources may be different in brightness or color from each other. By adopting such a configuration, it is possible to give display information having a different impression for each display information of each of the plurality of light guide plates.

  The display device of the present invention may have a blur filter on the surface. By adopting such a configuration, display information with a sense of unity can be displayed as a whole without emphasizing the individual shapes of the diffusion lines or diffusion dots.

FIG. 1 is a perspective view showing an outline of the configuration of a display light guide plate 10 according to the first embodiment. FIG. 2 is a perspective view showing a state where the first light guide plate 20a and the second light guide plate 20b constituting the display light guide plate 10 according to the first embodiment are separated. 3A is a front view showing the front of the display light guide plate 10 according to the first embodiment, FIG. 3B is a cross-sectional view taken along the line AA of FIG. 3A, and FIG. 3C is an enlarged view of a portion B in FIG. . FIG. 4 is an enlarged view of a portion C in FIG. 3b. FIG. 5 is a schematic view showing a state in which the diffusion groove 30b of the first light guide plate of the display light guide plate 10 according to the first embodiment is illuminated, and FIG. 5a does not overlap the diffusion groove 30a and the diffusion groove 30b. FIG. 5B is a schematic diagram showing a state in which the diffusion groove 30a and the diffusion groove 30b overlap each other. FIG. 6 is an enlarged view of a portion D in FIG. 5b. 7a and 7b are front views showing another embodiment of the diffusion groove 30 of the display light guide plate 10 according to the first embodiment. FIG. 8 is a cross-sectional view showing another embodiment of the relative positional relationship between the diffusion grooves 30 of the first light guide plate 20a and the second light guide plate 20b of the display light guide plate 10 according to the first embodiment. 9a and 9b are cross-sectional views showing a comparison of the relative positional relationship between the diffusion grooves 30 of the first light guide plate 20a and the second light guide plate 20b of the display light guide plate 10 according to the first embodiment. 10a and 10b are cross-sectional views showing different embodiments of the cross-sectional shapes of the diffusion grooves 30 of the first light guide plate 20a and the second light guide plate 20b of the display light guide plate 10 according to the first embodiment, respectively. FIG. 11 is an explanatory diagram for explaining another embodiment in which the contour groove 40 is not formed in the display light guide plate according to the first embodiment. FIG. 12 a is a perspective view showing a state in which the first light guide plate 20 a and the second light guide plate 20 b constituting the display light guide plate 11 in the second embodiment are separated, and FIG. 12 b is an enlarged view showing a cross section of the diffusing dots 32. FIG. FIG. 13 is a diagram illustrating an overlapping state of the diffusion dots 32 of the display light guide plate 11 according to the second embodiment. FIG. 14 is a perspective view showing a display device according to the third embodiment.

  Here, based on the drawings briefly described above, in describing the embodiment for carrying out the present invention, the correspondence between the components of the present invention and the components of the present embodiment will be clarified. In the first embodiment, the diffusion groove 30a and the diffusion groove 30b are used as the “diffusion line or diffusion dot” of the present invention, and the first light guide plate 20a and the second light guide plate 20b are used as the “plurality of light guide plates”. . In the second embodiment, the diffusion dots 32c and 32d are used as the “diffusion line or diffusion dot” of the present invention, and the third light guide plate 20c and the fourth light guide plate 20d are used as the “plurality of light guide plates”. . In the third embodiment, the diffusion groove 30a and the diffusion groove 30b are used as the “diffusion line or diffusion dot” of the invention, and the first light guide plate 20a and the second light guide plate 20b are used as the “plurality of light guide plates”. As the “LED light source”, the first LED lighting tool 122a and the second LED lighting tool 122b were used. In the present specification and claims, “front surface” refers to a surface that is visually recognized when the display light guide plate is visually recognized, and “back surface” refers to a surface on the opposite side. .

(First embodiment)
The configuration of the display light guide plate 10 according to the first embodiment will be described in detail with reference to FIGS. 1 to 4. Here, FIG. 1 is a perspective view showing an outline of the configuration of the first light guide plate 20a and the second light guide plate 20b according to the first embodiment of the present invention, and FIG. 2 shows the first light guide plate 20a and the second light guide plate 20b. It is a perspective view which shows the state which separated the light-guide plate 20b, respectively. 3a is a front view showing the front of the display light guide plate 10, FIG. 3b is an AA sectional view, and FIG. 3c is an enlarged view of the AA sectional view. FIG. 4 is a partially enlarged view of the AA sectional view of FIG. 3b.

  As shown in FIG. 1, the display light guide plate 10 mainly includes a first light guide plate 20 a and a second light guide plate 20 b, and light is incident on one of the light guide plates, whereby the incident light guide plate 20 Display information.

  As shown in FIG. 2, each of the first light guide plates 20a is a plate made of methacrylic resin having a thickness of about 4 millimeters to about 12 millimeters and having a high transmittance formed in a substantially rectangular parallelepiped plate shape. The first light guide plate 20a has a plurality of regularly arranged diffusion grooves 30a and contour grooves 40a provided at the contour positions of the diffusion grooves 30a on the back surface. Therefore, when light is incident from the side surface of the first light guide plate 20a, the light is refracted by the plurality of diffusion grooves 30a and the contour grooves 40a, and the light is mainly led out from the surface to brighten the diffusion grooves 30a and the contour grooves 40a. Illuminates and the information is visible. The plurality of diffusion grooves 30a are formed on the back side of the first light guide plate 20a so that display information such as characters, figures, symbols, and patterns can be visually recognized as a whole. In the first embodiment, a diffusion groove 30a is formed in the first light guide plate 20a so as to be visually recognized as a “designated seat”.

  The diffusion groove 30a is a groove recessed in a concave shape as shown in the AA cross-sectional views of FIGS. 3a and 3b, and is displayed by a plurality of laser processing marks so as to form regular parallel lines at equal intervals in the horizontal direction. It is formed inside the outline of information. The width of the diffusion grooves 30a is 0.5 to 0.7 millimeters, and the spacing between the diffusion grooves 30a is provided at a pitch of 2 millimeters.

  The contour groove 40a is provided at the contour position of the display information displayed by the diffusion groove 30a, and is formed by a plurality of laser processing marks similarly to the diffusion groove 30a. By forming the contour groove 40a, the contour of the display information can be clarified.

  The diffusion groove 30a and the contour groove 40a are linear lasers that are formed with a width of micro units by irradiating laser light a plurality of times linearly from one end side to the other end side of the groove after laser processing of the outer periphery. It is formed by connecting the processing marks. For example, a shape like a ladder or a hatching shape used for drawing is formed inside the groove, a plurality of parallel laser marks are formed inside the groove, and finally the entire groove is processed. A groove with a width of 0.5 to 0.7 millimeters is formed. In addition, it is preferable to provide a laser processing trace so that it may cross | intersect with respect to the incident light to a light-guide plate. For example, when light is incident from below, the laser processing trace may be formed so as to have a plurality of horizontal hatchings or oblique hatchings. Compared with the case where the laser processing trace is processed in parallel with the incident direction of light, the optical path and the laser processing trace always intersect, so that the light is easily refracted by the laser processing trace, and the diffusion groove 30a and the contour groove It is possible to make 40a appear brighter.

  On the other hand, the 2nd light guide plate 20b uses the board made from the methacrylic resin similar to the 1st light guide plate 20a, and the diffusion groove | channel 30b and the outline groove | channel 40b are provided by the same method. However, the diffusion groove 30b of the second light guide plate 20b is formed so as to be recognized as “free seat” and is shifted by 1 millimeter in the vertical direction with respect to the diffusion groove 30a of the first light guide plate 20a. ing. Note that the sizes of the diffusion groove 30 and the contour groove 40 in the drawing are drawn larger than the actual size for the sake of drawing.

  The first light guide plate 20a and the second light guide plate 20b manufactured as described above are superimposed on each other to form the display light guide plate 10. At this time, as described above, the diffusion groove 30b of the second light guide plate 20b is formed so as to be shifted by 1 millimeter in the vertical direction with respect to the diffusion groove 30a formed in the first light guide plate 20a. As shown in 3b and FIG. 3c, the diffusion grooves 30a and the diffusion grooves 30b are alternately arranged between the respective diffusion grooves 30a and 30b when viewed from the front. Moreover, since the width | variety of the diffusion groove | channel 30 is formed in 0.5-0.7 millimeter and the space | interval of diffusion groove | channel 30a or diffusion groove | channel 30b is provided in 2 millimeter pitch, mutual diffusion groove | channel 30a and The diffusion groove 30b is spaced apart, and a blank region 50 having no groove is formed between the diffusion groove 30a and the diffusion groove 30b. At this time, as shown in FIG. 4, when the diffusion groove 30a of the first light guide plate 20a is viewed from the surface side, the light derived from the plurality of diffusion grooves 30b of the second light guide plate 20b It may be arranged at a position other than the derived range α derived from the first light guide plate 20a. By forming the diffusion groove 30a in the first light guide plate 20a in this way, the possibility that the light diffused from the second light guide plate 20b may enter the diffusion groove 30a of the first light guide plate 20a can be further reduced. It is possible to prevent the light emitted from the diffusion groove 30b from appearing overlapping with the diffusion groove 30a to the viewer.

  According to the display light guide plate 10 according to the first embodiment described above, for example, when the second light guide plate 20b on the back side is displayed, the diffusion grooves of the second light guide plate 20b are displayed as shown in FIG. 5a. 30b is not hidden by the diffusion groove 30a of the first light guide plate 20a, and the entire diffusion groove 30b can be visually recognized through a portion other than the diffusion groove 30a, that is, through a transparent portion. For this reason, the diffusion groove 30b of the second light guide plate 20b can be visually recognized well, and the display information can be easily recognized. FIG. 5 schematically shows the state of the leftmost character when light is incident on the second light guide plate 20b of the display light guide plate 10, and the shining “self” character is filled in. This is black for convenience. FIG. 5b schematically shows the state where the diffusion groove 30b of the second light guide plate 20b and the diffusion groove 30a of the first light guide plate 20a are in the same position as a reference. By comparing FIG. 5a and FIG. 5b, it can be confirmed that the information of “self” in FIG.

  In addition, when the diffusion groove 30a of the first light guide plate 20a and the diffusion groove 30b of the second light guide plate 20b overlap each other, a part of the light diffused through the diffusion groove 30a enters the diffusion groove 30b. As shown in FIG. 6, a portion 70 that appears to shine lightly in the same range as the diffusion groove 30 b of the second light guide plate 20 b and a range that extends from this range to some extent occurs. However, when the diffusion grooves 30a and the diffusion grooves 30b are viewed from the front, the diffusion grooves 30a and 30b are alternately arranged between the respective diffusion grooves 30a and 30b, so that occurrence of such a state can be reduced. In addition, in the first embodiment, the diffusion groove 30a and the diffusion groove 30b are separated from each other, and the blank region 50 having no groove is formed, so that the light bent by the diffusion groove 30a of the first light guide plate 20a is reflected. The possibility of entering the diffusion groove 30b of the second light guide plate 20b can be further reduced. That is, it is possible to reduce the possibility that the diffusion groove 30a of the first light guide plate 20a shines dimly. In addition, even if the diffusion groove 30a is dimly lit, there is a blank area, so that the boundary of the diffusion groove 30b can be clearly seen and the display information can be easily recognized.

  In the first embodiment described above, the diffusion grooves 30 are described as being formed on parallel lines that are equidistant in the horizontal direction. However, the present invention is not limited to this, and it may be arranged regularly. . For example, the width between the grooves may be regularly arranged at a ratio of 1: 2: 3. That is, when the diffusion groove 30a of the first light guide plate 20a and the diffusion groove 30b of the second light guide plate 20b are shifted by a certain distance, all of the diffusion grooves 30a and 30b are arranged to be staggered. What is necessary is just to arrange regularly. Even such an embodiment can have the same effect.

  Further, in the first embodiment described above, the horizontal grooves are used as the diffusion grooves 30. However, the present invention is not limited to this, and as shown in FIG. 7A, the diffusion grooves 30 are grooves formed in the vertical direction. Alternatively, it may be a groove formed obliquely as shown in FIG. 7b. Depending on the direction of the incident light, the diffusion groove 30 in the optimum direction can be selected as appropriate. Note that the diffusion grooves 30 in FIGS. 7 a and 7 b represent only “finger” characters, and the diffusion grooves for other characters are omitted.

  In the first embodiment described above, a gap is formed between the diffusion groove 30a of the first light guide plate 20a and the diffusion groove 30b of the second light guide plate 20b, and the blank region 50 is formed. As shown in FIG. 8, the blank area 50 is not necessarily provided. By doing so, compared to the case where the blank region 50 is provided, a wider diffusion groove 30 or a narrower diffusion groove 30 can be formed.

  Moreover, in 1st Embodiment mentioned above, although demonstrated using the light guide plate 10 for display visually recognized from the front, depending on the direction visually recognized, the diffusion groove 30a of the 1st light guide plate 20a and the 2nd light guide plate 20b are used. The relative positional relationship of the diffusion grooves 30b can be changed. For example, in the case where the display light guide plate 10 is disposed at a high place and is used in a state of being always viewed from below, as shown in FIG. And the diffusion groove 30b are arranged so as not to overlap with each other, the light diffused in the diffusion groove 30b of the second light guide plate 20b when viewed from obliquely below is incident on the diffusion groove 30a of the first light guide plate 20a. It will be hidden. In such a situation, as shown in FIG. 9b, the diffusion groove 30a and the diffusion groove 30b can be arranged so as not to overlap each other when viewed from below. Thereby, a similar effect can be obtained when viewed from below.

  In the first embodiment described above, a rectangular groove is used as the cross-sectional shape of the diffusion groove 30. However, the present invention is not limited to this, and for example, a cross-sectional arc-shaped groove or a display light guide plate 10 is used. 10 is arranged at a high place and is always visible when looking up, as shown in FIG. 10, a trapezoidal cross section (FIG. 10a) or a triangular cross section so that light is led out downward. A groove having (FIG. 10b) may be used.

  In the first embodiment described above, the width of the diffusion groove 30a is 0.5 to 0.7 mm. However, the width is not limited to this, and the width of the diffusion groove is, for example, 0.6 mm. It may be ~ 1.5mm. In any case, the same effect as the above-described embodiment can be obtained. Further, although the pitch of the adjacent diffusion grooves 30 is set to 2.0 mm, the pitch is not limited to this. For example, pitches of about 1.5 mm, about 2.0 mm, and about 8.0 mm may be used. Good. In either case, the same effect as that of the first embodiment described above can be obtained. If the pitch is shortened, the display information can be expressed more clearly.

  In the first embodiment described above, the contour groove 40 is formed, but the contour groove 40 does not necessarily have to be formed as shown in FIG. When the contour groove 40 is not formed, only the diffusion groove 30 is formed, and since all the grooves do not overlap when viewed from the front, it is possible to display clear display information having a certain brightness.

  In the first embodiment described above, the diffusion groove 30 is used as the diffusion line. However, as the diffusion line, a (convex) diffusion line raised on the back surface side by screen printing or the like may be formed. Even if such a configuration is adopted, the same effect can be obtained.

(Second Embodiment)
Next, the configuration of the display light guide plate 11 according to the second embodiment will be described in detail with reference to FIGS. 12 and 13. Here, FIG. 12a is a perspective view schematically showing the configuration of the third light guide plate 20c and the fourth light guide plate 20d according to the second embodiment of the present invention. FIG. 12 b is an explanatory diagram illustrating the cross-sectional shape of the diffusing dots. In FIG. 12, the diffusion dots 32 of characters other than the characters “self” and “finger” are omitted. Similarly to the first embodiment, the display light guide plate 11 according to the second embodiment also includes two light guide plates, a third light guide plate 20c and a fourth light guide plate 20d.

  The third light guide plate 20c has a plurality of regularly arranged diffusion dots 32c and a contour groove 42c provided at the contour position of the diffusion dots 32c on the back surface side. When light is incident from the side surface of the third light guide plate 20c, the light is refracted by the plurality of diffusion dots 32c and the contour groove 42c, and the light is mainly derived from the surface.

  As shown in FIG. 12b, the diffusing dots 32c are concave portions recessed in a substantially quadrangular pyramid shape, and are provided so that a position corresponding to the bottom surface of the quadrangular pyramid is located on the back side of the third light guide plate 20c. In the second embodiment, the length of each side of the diffusion dot 32c is about 0.6 millimeters, the depth is about 0.4 millimeters, and the pitch between adjacent diffusion dots 32c is 2.0 millimeters.

  The diffusion dot 32c is formed by ultrasonic processing using an ultrasonic processing horn in which four processing dots each having a shape obtained by inverting the diffusion dot 32c on the front end surface are arranged in a matrix form. . That is, ultrasonic vibration is applied to the ultrasonic processing horn, and the ultrasonic processing horn is pressed perpendicularly to the back surface of the light guide plate to form the diffusion dot 32c having a shape reflecting the shape of the processing dot. .

  The contour groove 42c is processed by laser processing as in the first embodiment. The depth of the contour groove 42c may be formed so as to be shallower than the depth of the diffusion dot 32c (see FIG. 12b). By adopting such a configuration, at least part of the light incident from the side surface can reach the diffusion dot 32c without being refracted by the contour groove 42c, and the depth of the contour groove 42c is the depth of the diffusion dot 32c. Or the depth of the contour groove 42c is deeper than that of the diffusion dot 32c, more light can be bent by the diffusion dot 32c.

  On the other hand, the fourth light guide plate 20d uses a methacrylic resin plate similar to the third light guide plate 20c, and the diffusion dots 32d and the contour grooves 42d are provided by the same method. However, the diffusion dot 32d of the fourth light guide plate 20d is formed with the diffusion dot 32d so as to be visually recognized as “free seat”, and is 1 in the horizontal direction with respect to the diffusion dot 32c of the third light guide plate 20c. It is formed by shifting 1 mm in the vertical direction. Note that the sizes of the diffusion dots 32 and the contour grooves 42 in the drawing are drawn larger than the actual size for the sake of drawing.

  The third light guide plate 20c and the fourth light guide plate 20d manufactured as described above are superimposed on each other to form the display light guide plate 11. At this time, as described above, the diffusion dots 32d of the fourth light guide plate 20d are formed so as to be shifted by 1 millimeter in the horizontal direction and the vertical direction with respect to the diffusion dots 32c formed on the third light guide plate 20c. Therefore, as shown in FIG. 13, when the diffusion dots 32c of the third light guide plate 20c and the diffusion dots 32d of the fourth light guide plate 20d are viewed from the front, each diffusion dot 32 is either in the horizontal direction or the vertical direction. It is arranged to be staggered also in the direction of. Further, since the width of the diffusion dots 32 is 0.6 millimeters and the distance between the diffusion dots 32 is set at a pitch of 2 millimeters, the diffusion dots 32c and 32d are separated from each other. Thus, a blank area 51 without the diffusion dots 32 is formed.

  According to the display light guide plate 11 according to the second embodiment described above, for example, when the fourth light guide plate 20d on the back surface side is displayed, the diffusion dots 32d of the fourth light guide plate 20d become the third light guide plate 20c. Therefore, the entire diffusion dot 32d of the fourth light guide plate 20d can be visually recognized through a portion other than the diffusion dot 32c of the third light guide plate 20c, that is, a transparent portion. Therefore, the display information on the fourth light guide plate 20d can be clearly determined.

  Further, when the diffusion dots 32c of the third light guide plate 20c and the diffusion dots 32d of the fourth light guide plate 20d overlap each other, the light diffused from the diffusion dots 32c partially enters the diffusion dots 32d. There is a possibility that the diffusing dots 32d of the fourth light guide plate 20d may appear to dimly shine. However, by arranging the diffusion dots 32c of the third light guide plate 20c and the diffusion dots 32d of the fourth light guide plate 20d so as to be positioned between the respective diffusion dots 32 when viewed from the front, such a state is achieved. It can be prevented from occurring. Also in the second embodiment, the diffusion dots 32c of the third light guide plate 20c and the diffusion dots 32d of the fourth light guide plate 20d are separated from each other, and the blank region 51 without the diffusion dots 32 is formed. The possibility that the light bent by the diffusion dots 32c of the third light guide plate 20c enters the diffusion dots 32d of the fourth light guide plate 20d can be further reduced.

  In the second embodiment described above, the diffusion dot 32 has a concave shape recessed in a substantially quadrangular pyramid shape. However, the present invention is not limited to this, and various forms such as a hemispherical concave portion and a conical concave portion are adopted. Can do. Also by this, the same effect as the above-mentioned effect can be obtained. Moreover, it does not necessarily need to be a recessed part, and you may form it so that a spreading | diffusion dot may rise by screen printing etc. (convex shape).

  In the second embodiment described above, the length of each side of the diffusion dot 32 is 0.6 mm and the depth is 0.4 mm. However, the present invention is not limited to this, and the diffusion dot 32 is not limited thereto. The length of each side may be, for example, 0.6 mm to 1.5 mm. Moreover, the depth of the diffusion dot 32 may be 0.4 millimeters to 0.8 millimeters, for example. In any case, the same effect as the above-described embodiment can be obtained. Moreover, although the pitch between the adjacent diffusing dots 32 is 2.0 millimeters, the pitch is not limited to this. For example, pitches of about 1.5 millimeters, about 2.0 millimeters, and about 8.0 millimeters are used. Also good. In any case, the same effects as those of the second embodiment described above can be obtained.

  In the second embodiment described above, the diffusion dots 32 having the same shape are provided. However, the shape and size of the diffusion dots 32 may be the same or different. For example, as the distance from the light source increases, each side of the diffusing dot 32 may be lengthened gradually, or the depth of the diffusing dot 32 may be gradually increased. In this way, the amount of light that is bent is small at a position where the light is close and strong from the light source, and the amount of light that is bent increases as the distance from the light source increases. Therefore, in addition to the effects of the above-described embodiment, the brightness of the diffusion dots 32 is increased. It can be shown evenly.

(Third embodiment)
Next, the display device 100 using the display light guide plate 10 according to the first embodiment will be described in detail with reference to FIG. Here, FIG. 14 is a perspective view showing an outline of the structure of the display device 100. As shown in FIG. 14, the display device 100 includes a frame 110 capable of fitting the left and right side surfaces and the upper surface of the display light guide plate 10, and a support base 120 that supports the display light guide plate 10 on the bottom surface side. ing. Two LEDs, a first LED illuminator 122a and a second LED illuminator 122b, each of which includes a plurality of LEDs 121, are provided on the lower surface of the support base 120. The two first LED illuminators 122a and the second LED illuminators 122b are respectively led to the first guide. The light guide plate 20a and the second light guide plate 20b are arranged so as to correspond to the lower side surfaces, and the side surfaces of the first light guide plate 20a and the second light guide plate 20b above the first LED lighting tools 122a and the second LED lighting tools 122b, respectively. The display light guide plate 10 is attached so that each is positioned. In addition, the 1st LED lighting fixture 122a and the 2nd LED lighting fixture 122b are good also as what has the same light quantity, and may have a different light quantity. Moreover, each luminescent color of the 1st LED lighting fixture 122a and the 2nd LED lighting fixture 122b may be the same, or may differ. A blur filter 130 is attached to the outermost surface of the display light guide plate 10. The blur filter 130 has an effect of blurring display information on the first light guide plate 20a or the second light guide plate 20b to make a soft impression. When the blur filter 130 is combined, the second light guide plate 20b is displayed. In addition, the phenomenon that the diffusion groove 30a of the first light guide plate 20a shines dimly can be further eased and visually recognized. The left and right side surfaces and the upper surface of the display light guide plate 10 are supported by the frame body 110 to form the display device 100.

  In the display device 100, the first LED lighting tool 122a and the second LED lighting tool 122b can be switched on by power supplied from a power source (not shown). When one of the first LED illuminator 122a and the second LED illuminator 122b is lit, light is incident on the side surface of the light guide plate on the lit side. For example, when the first LED illuminator 122a is turned on, light is incident on the side surface of the first light guide plate 20a. This light is bent by the diffusion groove 30 and the contour groove 40, is derived from the surface side of the first light guide plate 20a, and displays display information of the diffusion groove 30 and the contour groove 40 formed in the first light guide plate 20a. Become. By switching from the first LED illuminator 122a to the second LED illuminator 122b from this state, light is incident on the second light guide plate 20b and display information of the diffusion grooves 30b and the contour grooves 40b formed in the second light guide plate 20b is displayed. Can be displayed.

  In 3rd Embodiment mentioned above, although the 1st LED lighting tool 122a and the 2nd LED lighting tool 122b shall be installed in the support stand 120, you may provide an LED lighting tool in the upper surface or side surface by the side of the frame 110, You may arrange | position the 1st LED lighting tool 122a and the 2nd LED lighting tool 122b on a separate side surface.

  The present invention is not limited to the first to third embodiments described above, and it goes without saying that the present invention can be implemented in various modes as long as it belongs to the technical scope of the present invention.

  In the first to third embodiments described above, the light guide plate is a plate made of methacrylic resin having transparency. However, the light guide plate is not limited to methacrylic resin as long as it is a transparent material. In addition to methacrylic resins such as methyl methacrylate and ethyl methacrylate, various materials such as acrylic resins such as methyl acrylate and ethyl acrylate, polycarbonate, and polyethylene can be used. In any case, the same effect as the above-described embodiment can be obtained.

  In the first to third embodiments described above, the display light guide plate using two light guide plates has been described. However, the number of light guide plates is not limited to two, and a plurality of light guide plates. As long as you are using. When a plurality of light guide plates are used, the above-described effects are obtained in relation to the light guide plates arranged on the front surface side or the back surface side.

  In the first to third embodiments described above, the two light guide plates are arranged so as to be in direct contact with no gap, but the light guide plates need to be in contact with each other. It may be arranged with a gap. Even in this case, the same effect as the above-described embodiment can be obtained.

  As shown in the above-described embodiment, the present invention can be used as a display light guide plate for illumination, particularly for illumination.

DESCRIPTION OF SYMBOLS 10 ... Display light guide plate, 11 ... Display light guide plate, 20a ... 1st light guide plate, 20b ... 2nd light guide plate, 20c ... 3rd light guide plate, 20d ... 4th light guide plate, 30, 30a, 30b, 32, 32c, 32d ... diffusion dots, 40, 40a, 40b, 42, 42c, 42d ... contour grooves, 50, 51 ... blank area, 100 ... display device, 110 ... frame, 120 ... support base, 121 ... LED, 122a ... 1st LED illuminator, 122b ... 2nd LED illuminator, 130 ... Blur filter

Claims (9)

It has a plurality of diffusion lines or a plurality of diffusion dots arranged on the back surface to represent display information and formed inside the outline of the display information, and diffuses light incident from the side surface so that it is mainly derived from the front surface. A plurality of light guide plates for displaying the display information of the diffusion lines or the diffusion dots,
When the light guide plate is viewed from the front side, all the diffusion lines or the diffusion dots of the light guide plate are arranged on the front side or the back side of the adjacent light guide plates. A display light guide plate, wherein the display light guide plate is arranged directly or with a part of the display information overlapped so as not to overlap.   The display light guide plate according to claim 1, wherein the plurality of diffusion lines or the plurality of diffusion dots are regularly arranged. The intervals between the plurality of diffusion lines or the plurality of diffusion dots are formed wider than the width of the diffusion lines or the width of the diffusion dots,
The said light guide plate is arrange | positioned so that all the said diffusion lines of the said light guide plate, or the said diffusion dots may be visually recognized spaced apart, when it visually recognizes from the surface side. The light guide plate for display according to 1.   The display light guide plate according to claim 1, further comprising a contour groove that represents a contour of display information around the diffusion line or the diffusion dot.   When the plurality of diffusion lines or the plurality of diffusion dots of the light guide plate arranged on the front side are viewed from the front side, the plurality of diffusion lines or the plurality of diffusion lines of the light guide plate arranged on the adjacent back side 5. The display according to claim 1, wherein the light derived from the diffusion dots is disposed at a position other than the derived range derived from the light guide plate disposed on the front surface side. 6. Light guide plate.   The display light guide plate according to claim 1, wherein the diffusion line includes a diffusion groove. The display light guide plate according to any one of claims 1 to 6,
Corresponding to the plurality of light guide plates, a plurality of LED light sources that incident irradiation light from the side surface;
A display device comprising: The display device according to claim 7, wherein each of the plurality of LED light sources has different brightness or color. The display device according to claim 7 or 8,
A display device comprising a blur filter on a surface.

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