JP2016118667A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device having a light guide plate of a side-edge light system which is improved in display uniformity.SOLUTION: A light source 2 is arranged on a light incident end face 1a side of a light guide plate 1, and a light source 3 is arranged on a light incident end face 1b side. Light La from the light source 2 irradiates a display pattern DPA of "A" formed at an anti-light emission face 1c of the light guide plate 1, and light Lb from the light source 3 irradiates a display pattern DPB of "B" formed at an anti-light emission face 1c of the light guide plate 1. Clusters C1, C2 composed of linear grooves having a pair of inclined faces (reflection faces) are arranged in a non-overlapped region of the display patterns DPA, DPB, and a cluster C3' composed of a rectangular groove (parallelogram) having two pairs of inclined faces (reflection faces) is arranged in an overlapped region of the display patterns DPA, DPB.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display device that displays a display pattern by causing a light guide plate to emit light by a side edge light method.

  As a display device such as a game machine, there is a display device that displays a display pattern formed on a light guide plate by surface-emitting a light guide plate using a side edge light system.

  FIG. 5 is a diagram illustrating a display principle of a display device using a light guide plate.

  As shown in FIG. 5A, a light source 102 is provided on the light incident end face 101a side of the light guide plate 101, and a triangular prism-shaped minute dot groove shown in FIG. (Hereinafter referred to as a cluster) 103 is formed. As a result, the light L101 from the light source 102 that has entered the light incident end surface 101a of the light guide plate 101 is totally reflected by the inclined surface (reflective surface) 1031 of the cluster 103 and is directed upward in FIG. The light exits from the light exit surface 101c. Accordingly, when a display pattern is formed by arranging a large number of clusters 103, the observer 104 on the light exit surface 101c side can visually recognize a display pattern made up of a large number of minute clusters 103 (see: FIG. 12 of Patent Document 1, Patent Document 2). FIG. 1A).

  In the case of displaying a plurality of the above-described display patterns, a display device in which two display patterns having different directions of the inclined surfaces (reflection surfaces) of the cluster are formed on one light guide plate and light in two directions is incident from two light sources is provided. Yes (see: Patent Documents 1 and 2).

  6A and 6B show a first conventional display device, in which FIG. 6A is an overall plan view, and FIG. 6B is a partially enlarged plan view in a circle VI of FIG. 2 of literature 2 and FIG. 2B).

  As shown in FIG. 6A, a plurality of light emitting diode (LED) packages 21, 22,..., 25 are provided in a row on the light incident end face 1 a side of the light guide plate 1 as the light source 2. A plurality of LED packages 31, 32,..., 35 are provided in a row on the light incident end surface 1b side orthogonal to the light incident end surface 1a of the light guide plate 1. Light La from the LED packages 21, 22,... 25 irradiates the display pattern DPA “A” provided on the light exit surface 1 c of the light guide plate 1, and from the LED packages 31, 32,. The light Lb irradiates the “B” display pattern DPB provided on the light exit surface 1 c of the light guide plate 1.

  As shown in FIG. 6B, the display pattern DPA is composed of a large number of clusters C1 made of X-direction linear grooves formed at the intersections of the first lattice, and the display pattern DPB is composed of the first lattice. Are formed by a large number of clusters C2 made of Y-direction linear grooves formed on the intersections of the second lattice different from the above. In this case, the density of the cluster C1 and the density of the cluster C2 are the same. As shown in FIG. 7A, the cluster C1 has two inclined surfaces (reflective surfaces) S1A in the X direction, and as shown in FIG. 7B, the cluster C2 has two inclined surfaces in the Y direction. It has a surface (reflection surface) S2B.

  In FIG. 6B, in the region where the display pattern DPA and the display pattern DPB overlap, the cluster C1 and the cluster C2 are provided at the same density so as not to overlap. Therefore, the density of the cluster in the area where the display pattern DPA and the display pattern DPB overlap is twice the density of the cluster in the area of the display patterns DPA and DPB where the display pattern does not overlap.

  In FIGS. 6A and 6B, the light La from the LED packages 21, 22,..., 25 incident on the light incident end face 1a of the light guide plate 1 is one X direction of each cluster C1 of the display pattern DPA. The light is totally reflected by the inclined surface (reflecting surface) S1A and is emitted from the light exit surface 1d of the light guide plate 1, whereby an observer on the light exit surface 1d side can visually recognize the display pattern DPA. Similarly, light Lb from the LED packages 31, 32,..., 35 incident on the light incident end surface 1b of the light guide plate 1 is totally reflected by one Y-direction inclined surface (reflective surface) S2B of each cluster C2 of the display pattern DPB. Then, the light exits from the light exit surface 1d of the light guide plate 1, whereby the observer on the light exit surface 1d side can visually recognize the display pattern DPB.

  8A and 8B show a second conventional display device, in which FIG. 8A is an overall plan view, and FIG. 8B is a partially enlarged plan view in a circle VIII of FIG. 11 (D)).

  As shown in FIG. 8B, a cluster C3 different from the clusters C1 and C2 is provided in the overlapping area of the display pattern DPA “A” and the display pattern DPB “B” in FIG. It has been. In this case, the cluster C3 is also provided at the intersection of the same lattice as the clusters C1 and C2, and therefore the density of the cluster C3 is the same as the density of the clusters C1 and C2.

  As shown in FIGS. 9A and 9B, the clusters C1 and C2 are the same as the clusters C1 and C2 in FIGS. 7A and 7B. On the other hand, as shown in FIG. 9C, the cluster C3 has a cross shape in which the X-direction grooves and the Y-direction grooves intersect at right angles. Therefore, since the inclined surface (reflective surface) S3A of the X-direction groove and the inclined surface (reflective surface) S3B of the Y-direction groove are orthogonal to each other, they do not affect each other. As a result, the display pattern DPA is composed of the X direction inclined surface (reflective surface) S1A of each cluster C1 and the X direction inclined surface (reflective surface) S3A of each cluster C3, and the display pattern DPB is inclined in the Y direction of each cluster C2. It consists of a surface (reflection surface) S1B and a Y-direction inclined surface (reflection surface) S3B of each cluster C3.

  In FIG. 8, the light La from the LED packages 21, 22,..., 25 incident on the light incident end surface 1a of the light guide plate 1 is one X-direction inclined surface (reflective surface) S1A of each cluster C1 of the display pattern DPA. The light is totally reflected by one X-direction inclined surface (reflective surface) S3A of each cluster C3 and emitted from the light exit surface 1d of the light guide plate 1, whereby an observer on the light exit surface 1d side can visually recognize the display pattern DPA. Similarly, the light Lb from the LED packages 31, 32,..., 35 incident on the light incident end surface 1b of the light guide plate 1 is one Y-direction inclined surface (reflective surface) S2B of each cluster C2 of the display pattern DPB and each cluster. The light is totally reflected by one Y-direction inclined surface (reflective surface) S3B of C3 and emitted from the light exit surface 1d of the light guide plate 1, whereby the observer on the light exit surface 1d side can visually recognize the display pattern DPB.

JP 2006-75362 A Japanese translation of PCT publication No. 2003-519810 (Patent No. 4741142)

  However, in the first conventional display device described above, in the region where the display pattern DPA of “A” and the display pattern DPB of “B” overlap, both the clusters C1 and C2 are on intersections of different grids. Since the density of the cluster is larger than that of other regions, the number of vertices T shown in FIG. 6B is increased, and the miscellaneous light that does not contribute to the display from the vertices T is increased. There is a problem that display uniformity is inferior.

  In the second conventional display device described above, the cluster C3 in the region where the display pattern DPA of “A” and the display pattern DPB of “B” overlap is also on the intersection of the same lattice of the clusters C1 and C2. Since it is provided, the cluster density does not increase. However, since there are still many vertices T shown in FIGS. 8B and 9C in the cross-shaped cluster C3, the miscellaneous light that does not contribute to the display from the vertices T compared to other regions. As a result, there is still a problem that display uniformity is inferior. In particular, the inner angle α of the groove at the center of the cluster C3 is configured to be greater than 180 °, and as a result, the number of vertices T increases, so that miscellaneous light increases. Furthermore, there is a problem that it cannot be applied to a display device in which three or more different display patterns having inclined surfaces (reflection surfaces) are formed on one light guide plate and light in three or more directions is incident from different light sources.

  In order to solve the above-described problems, a display device according to the present invention includes a light guide plate, a plurality of light sources provided on a plurality of light incident end face sides of the light guide plate and having different directions of emitted light, and a reflected light of the light guide plate. A plurality of display patterns that are provided on the surface and that are irradiated with light from each light source and reflect the light to the light exit surface of the light guide plate, and in the non-overlapping region where only one display pattern exists, the display A first cluster formed by linear grooves having an inclined surface in a direction orthogonal to the direction of light emitted from the light source of the pattern is provided, and an overlapping region where two or more display patterns overlap is provided in each overlapping region. The second cluster is formed of polygonal grooves each having an inclined surface with a tilted surface in a direction orthogonal to the direction of the emitted light of the light source of the display pattern and having an inner angle of less than 180 °.

  According to the present invention, all the clusters can be provided on the intersection point of the same lattice, and the cluster formed by the polygonal grooves provided in the overlapping region where the display patterns are overlapped has an inner angle α of the groove. Since the angle is smaller than 180 °, the number of vertices is small and the amount of miscellaneous light that does not contribute to display is reduced. As a result, display uniformity can be improved. Also, three or more different display patterns can be formed on the light guide plate by using polygonal grooves that are equal to or more than triangular grooves.

BRIEF DESCRIPTION OF THE DRAWINGS The 1st Embodiment of the display apparatus which concerns on this invention is shown, (A) is a whole top view, (B) is the elements on larger scale in the circle I of (A). It is a perspective view which shows the detail of the cluster of FIG. The 2nd Embodiment of the display apparatus which concerns on this invention is shown, (A) is a whole top view, (B) is the elements on larger scale in the circle III of (A). It is a perspective view which shows the detail of the cluster of FIG. It is a figure which shows the display principle of the display apparatus using a light-guide plate, Comprising: (A) is whole sectional drawing, (B) is a perspective view of the cluster of (A). The 1st conventional display apparatus is shown, (A) is a whole top view, (B) is the elements on larger scale in circle VI of (A). It is a perspective view which shows the detail of the cluster of FIG. The 2nd conventional display apparatus is shown, (A) is a whole top view, (B) is the elements on larger scale in the circle VIII of (A). It is a perspective view which shows the detail of the cluster of FIG.

  1A and 1B show a first embodiment of a display device according to the present invention, in which FIG. 1A is an overall plan view, and FIG. 1B is a partially enlarged plan view in a circle I of FIG.

  1A and 1B, a cluster C3 'is provided instead of the cluster C3 in FIG. Also in this case, the cluster C3 'is provided at the intersection of the same lattice as the clusters C1 and C2, and therefore the density of the cluster C3' is the same as the density of the clusters C1 and C2. As shown in FIGS. 2A and 2B, the clusters C1 and C2 are the same as the clusters C1 and C2 shown in FIGS. 9A and 9B. On the other hand, as shown in FIG. 2C, the cluster C3 ′ is composed of rectangular grooves (generally, parallelogram-shaped grooves), two X-direction inclined surfaces (reflection surfaces) S3A ′ and two Y-direction inclinations. The surface (reflection surface) S3B ′ is orthogonal to the surface. As a result, the display pattern DPA is composed of the X direction inclined surface (reflective surface) S1A of the cluster C1 and the X direction inclined surface (reflective surface) S3A 'of the cluster C3 ′, and the display pattern DPB is the Y direction inclined surface of the cluster C2. (Reflecting surface) S2B and a Y-direction inclined surface (reflecting surface) S3B 'of the cluster C3'.

  In FIGS. 1A and 1B, the light La from the LED packages 21, 22,..., 25 incident on the light incident end face 1a of the light guide plate 1 is inclined in one X direction of the cluster C1 of the display pattern DPA. The surface (reflecting surface) S1A and one X-direction inclined surface (reflecting surface) S3A ′ of the cluster C3 ′ are totally reflected and emitted from the light exiting surface 1d of the light guide plate 1, whereby the observer on the light exiting surface 1d side The display pattern DPA can be visually recognized. Similarly, the light Lb from the LED packages 31, 32,..., 35 incident on the light incident end surface 1b of the light guide plate 1 is one Y-direction inclined surface (reflecting surface) S2B of the cluster C2 of the display pattern DPB and the cluster. The light is totally reflected by one Y-direction inclined surface (reflecting surface) S3B ′ of C3 ′ and emitted from the light exit surface 1d of the light guide plate 1, whereby the observer on the light exit surface 1d side can visually recognize the display pattern DPB.

  In the display device shown in FIGS. 1 and 2, the density of the cluster C3 ′ for receiving the light from the two light sources 2 and 3 and totally reflecting the light is the same as the density of the clusters C1 and C2. In the cluster C3 ′, since the inner angle α of the groove is less than 180 °, the number of vertices T is reduced, and the amount of miscellaneous light that does not contribute to display is reduced. As a result, display uniformity can be improved.

  1 and 2, the light incident end face 1a of the light guide plate 1 provided with the light source 2 and the light incident end face 1b of the light guide plate 1 provided with the light source 3 are orthogonal to each other. As long as α is less than 180 °, the light incident end face 1a of the light guide plate 1 provided with the light source 2 and the light incident end face 1b of the light guide plate 1 provided with the light source 3 may not be orthogonal to each other. In this case, the cluster C3 'is not a rectangular groove but a parallelogram groove.

  3A and 3B show a second embodiment of the display device according to the present invention, in which FIG. 3A is an overall plan view, and FIG. 3B is a partially enlarged plan view in a circle III of FIG.

  3A and 3B, a plurality of LED packages 121, 122, and 123 are provided in a row on the light incident end surface 11 a side of the light guide plate 11 as the light source 12, and the light guide plate 11 has the light source 13 as the light source 13. A plurality of LED packages 131, 132, 133 are provided in a row on the light incident end surface 11b side, and a plurality of LED packages 141, 142, 143 are provided in a row on the light incident end surface 11c side of the light guide plate 11 as the light source 14. It is. The light incident end faces 11a, 11b, and 11c are shifted by 120 ° with respect to the center of the apparatus. The light La from the LED packages 121, 122, 123 irradiates the “A” display pattern DPA provided on the light exit surface 11 d of the light guide plate 11, and the light Lb from the LED packages 131, 132, 133 is guided. The display pattern DPB of “B” provided on the reflection light exit surface 11 d of the light plate 11 is irradiated, and further, the light Lc from the LED packages 141, 142, 143 is “C” provided on the reflection light exit surface 11 d of the light guide plate 11. Is irradiated with the display pattern DPC.

  As shown in FIG. 3B, the display patterns DPA, DPB, and DPC are composed of clusters C11, C12, C13, C14, C15, C16, and C17. The clusters C11, C12, C13, C14, C15, C16, and C17 are formed on intersections of a predetermined lattice, and therefore the cluster density is constant and uniform.

  The cluster C11 is formed only in the area of the display pattern DPA of “A”. That is, as shown in FIG. 4A, the cluster C11 is composed of X-direction linear grooves and has two inclined surfaces (reflection surfaces) S11A in the X direction. One of the inclined surfaces (reflecting surfaces) S11A is irradiated with the light La from the LED packages 121, 122, and 123.

  The cluster C12 is formed only in the region of the display pattern DPB of “B”. That is, as shown in FIG. 4B, the cluster C12 is composed of straight grooves in the D (+ 120 °) direction 120 ° counterclockwise in the X direction, and two inclined surfaces (reflection surfaces) in the D (+ 120 °) direction. ) S12B. One of the inclined surfaces (reflecting surfaces) S12B is irradiated with the light Lb from the LED packages 131, 132, 133.

  The cluster C13 is formed in the area of only the display pattern DPC of “C”. That is, as shown in FIG. 4C, the cluster C13 is composed of straight grooves in the D (−120 °) direction 120 ° clockwise in the X direction, and two inclined surfaces (reflection) in the D (−120 °) direction. Surface) S13C. One of the inclined surfaces (reflection surfaces) S13C is irradiated with the light Lc from the LED packages 141, 142, and 143.

  The cluster C14 is formed in a region where the “B” display pattern DPB and the “C” display pattern DPC overlap. That is, as shown in FIG. 4D, the cluster C14 is formed of rhombus-shaped (widely parallelogram-shaped) grooves, and two inclined surfaces (reflection surfaces) S14B and D (−120) in the D (+ 120 °) direction. °) has two inclined surfaces (reflection surfaces) S14C in the direction. One of the inclined surfaces (reflecting surfaces) S14B is irradiated with light Lb from the LED packages 131, 132, 133, and one of the inclined surfaces (reflecting surfaces) S14C is irradiated with light Lc from the LED packages 141, 142, 143. Is done.

  The cluster C15 is formed in an area where the “C” display pattern DPC and the “A” display pattern DPA overlap. That is, as shown in FIG. 4E, the cluster C15 is composed of rhombus-shaped (widely parallelogram-shaped) grooves, two inclined surfaces (reflecting surfaces) S15C in the D (−120 °) direction, and in the X direction. Two inclined surfaces (reflective surfaces) S15C are provided. One of the inclined surfaces (reflecting surfaces) S15C is irradiated with light Lc from the LED packages 141, 142, 143, and one of the inclined surfaces (reflecting surfaces) S15A is irradiated with light La from the LED packages 121, 122, 123. Is done.

  The cluster C16 is formed in a region where the “A” display pattern DPA and the “B” display pattern DPB overlap. That is, as shown in FIG. 4F, the cluster C16 is composed of rhombus-shaped (widely parallelogram-shaped) grooves, and two inclined surfaces (reflecting surfaces) S16A in the X direction and 2 in the D (+ 120 °) direction. There are two inclined surfaces (reflective surfaces) S16B. One of the inclined surfaces (reflecting surfaces) S16A is irradiated with light La from the LED packages 121, 122, 123, and one of the inclined surfaces (reflecting surfaces) S16B is irradiated with light Lb from the LED packages 131, 132, 133. Is done.

  The cluster C17 is formed in an area where the “A” display pattern DPA, the “B” display pattern DPB, and the “C” display pattern DPC overlap. That is, as shown in FIG. 4G, the cluster C17 includes triangular grooves, and one inclined surface (reflective surface) S17A in the X direction and one inclined surface (reflective surface) S17B in the D (+ 120 °) direction. And one inclined surface (reflecting surface) S17C in the D (−120 °) direction. The inclined surface (reflective surface) S17A is irradiated with light La from the LED packages 121, 122, 123, and the inclined surface (reflective surface) S14B is irradiated with light Lb from the LED packages 131, 132, 133. The inclined surface (reflective surface) S14C is irradiated with light Lc from the LED packages 141, 142, and 143.

  3A and 3B, the light La from the LED packages 121, 122, and 123 incident on the light incident end surface 11a of the light guide plate 11 is reflected on one inclined surface (reflected) of the cluster C11 of the display pattern DPA. Surface) S11A, one inclined surface (reflective surface) S15A of cluster C15, one inclined surface (reflective surface) S16A of cluster C16, and inclined surface (reflective surface) S17A of cluster C17, and light reflected from the light guide plate 11 The light is emitted from the surface 11d, whereby the observer on the light exit surface 11d side can visually recognize the display pattern DPA. Further, the light Lb from the LED packages 131, 132, and 133 incident on the light incident end surface 11b of the light guide plate 11 is one inclined surface (reflecting surface) S12B of the cluster C12 of the display pattern DPB, and one inclined surface of the cluster C14. (Reflective surface) S14B, one inclined surface (reflective surface) S16B of cluster C16, and totally reflected by inclined surface (reflective surface) S17B of cluster C17 are emitted from the light exit surface 11d of the light guide plate 11, and thereby the light exit surface An observer on the 11d side can visually recognize the display pattern DPB. Furthermore, the light Lc from the LED packages 141, 142, and 143 incident on the light incident end surface 11c of the light guide plate 11 is one inclined surface (reflecting surface) S13C of the cluster C13 of the display pattern DPC, and one inclined surface of the cluster C14. (Reflection surface) S14C, one inclined surface (reflection surface) S15C of the cluster C15, and total reflection on the inclined surface (reflection surface) S17C of the cluster C17, and exits from the light exit surface 11d of the light guide plate 11, thereby the light exit surface An observer on the 11d side can visually recognize the display pattern DPC.

  In the display device shown in FIGS. 3 and 4, the density of the clusters C14, C15 and C16 for receiving the light from the two light sources 13, 14; 14, 12; , C12, and C13, and the clusters C14, C15, and C16 have a small number of vertices T and the interior angle α of the groove is less than 180 °. As a result, the display uniformity can be improved. Similarly, the density of the cluster C17 for receiving light from the three light sources 12, 13, and 14 and totally reflecting the light is also the same as the density of the clusters C11, C12, and C13. Since the inner angle α is 180 °, the number of vertices T is small, and the amount of miscellaneous light that does not contribute to display is reduced. As a result, display uniformity can be improved.

  3 and 4, the light incident end surface 11 a of the light guide plate 11 provided with the light source 12, the light incident end surface 11 b of the light guide plate 11 provided with the light source 13, and the light guide plate 11 provided with the light source 14. Although the incident light end face 11c is displaced by 120 degrees at an equal angle, other non-equal angles may be used.

  Moreover, in the clusters C1, C2, C3 ′, and C11 to C16 in FIGS. 1, 2, 3, and 4, a pair of inclined surfaces (reflection surfaces) are provided for each light. Only one inclined surface (reflective surface) facing the incident direction may be provided, and the other inclined surface (reflective surface) may be a vertical surface. Furthermore, although the inclined surfaces (reflection surfaces) of the clusters C1, C2, C3 ', and C11 to C16 use total reflection, a reflection layer may be formed in the groove and reflection of this reflection layer may be used.

  Thus, in the above-described embodiment, the cluster for receiving and totally reflecting light from one light source (LED package) has an inclined surface (reflecting surface) perpendicular to the direction of the light, and 2 A cluster for receiving and totally reflecting light from two light sources (LED packages) has a rectangular groove or rhomboid groove (widely, a parallelogram-shaped groove) having an inclined surface (reflection surface) perpendicular to the direction of each light. None, and a cluster for receiving and totally reflecting light from three light sources (LED packages) has a triangular groove having an inclined surface (reflective surface) perpendicular to the direction of each light. In general, a cluster for receiving and totally reflecting light from n (n ≧ 3) light sources (LED packages) is an n-shaped groove having an inclined surface (reflection surface) perpendicular to the direction of each light. It only has to be done.

  Furthermore, the present invention can be applied to any modification within the scope of the object of the above-described embodiment.

DESCRIPTION OF SYMBOLS 1, 11: Light-guide plate 1a, 1b, 11a, 11b, 11c: Light-incidence end surface 1c, 11d: Anti-light-emitting surface 1d, 11e: Light-emitting surface 2, 3, 12, 13, 14: Light source 21, 22, ..., 25 , 31, 32,..., 35, 121, 122, 123, 131, 132, 133, 141, 142, 143: LED packages La, Lb, Lc: Light C1, C2, C3, C3 ′, C11, C12,. C17: Clusters S1A, S2B, S3A, S3B, S3A ′, S3B ′, S11A, S12B, S13C, S14B, S14C, S15C, S15A, S16A, S16B, S17A, S17B, S17C: Inclined surfaces (reflective surfaces)
101: Light guide plate 101a: Light incident end surface 101b: Counter light exit surface 101c: Light exit surface 102: Light source 103: Cluster 1031: Inclined surface (reflective surface)
104: Observer L101: Light T: Vertex α: Interior angle of groove

Claims (4)

A light guide plate;
A plurality of light sources provided on a plurality of light incident end face sides of the light guide plate, and different directions of emitted light; and
A plurality of display patterns provided on the light exit surface of the light guide plate and irradiated with light from each light source to reflect the light to the light exit surface of the light guide plate;
In a non-overlapping region where only one display pattern exists, a first cluster including a linear groove having an inclined surface in a direction orthogonal to the direction of light emitted from the light source of the display pattern is provided.
In the overlapping region where two or more of the display patterns are overlapped, each of the overlapping display patterns has an inclined surface in a direction perpendicular to the direction of the emitted light of the light source, and each interior angle is less than 180 ° A display device provided with a second cluster of grooves.   The display device according to claim 1, wherein the polygonal groove of the second cluster in the overlapping region where the two display patterns overlap is a parallelogram-shaped groove.   The display device according to claim 1, wherein the polygonal groove of the second cluster in the overlapping region where n (≧ 3) display patterns overlap is an n-shaped groove. The display device according to claim 1, wherein the first and second clusters are provided on intersections of the same lattice.

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