TWI815640B - Optical element and display device using the same - Google Patents

Abstract

The present invention provides an optical element and a display device using the same. The optical element includes a light guide plate with a bottom edge, a first side edge and a second side edge, the bottom edge being respectively connected to the first side edge and the second side edge; a light bar being arranged on the bottom edge of the light guide plate, the light bar being arranged with a plurality of light-emitting points along a direction of the bottom edge of the light guide plate; a light-shielding glue being arranged on the bottom edge of the light guide plate and covering the light bar and a portion of the light guide plate; in which the light-shielding glue has a width along a direction perpendicular to the bottom edge of the light guide plate, and the width becomes gradually smaller along a direction from the center position of the bottom edge to the first side or the second side.

Description

Optical components and display devices using the same

The present invention relates to an optical element and a display device using the same, and in particular, to an optical element that improves the problem of local lighting on the light incident side and a display device using the same.

With the development of science and technology, display devices are widely used in many electronic products, such as mobile phones, tablets, watches, cars, etc.

In a reflective display device, the light guide plate is disposed on the display panel. Since there is no other film layer on the light guide plate to cover and shield the light guide plate, there is a phenomenon of local obvious lighting on the light incident side of the display device. One current improvement method is to reduce the dot density in the corresponding bright area on the light guide plate. However, in this way, the visibility of the dots here becomes worse, and the dots can be seen from the display surface, affecting the display effect.

Therefore, how to provide an optical element that improves the local brightness problem on the light incident side is actually one of the problems that needs to be solved.

Embodiments of the present invention provide an optical element and a display device, which can effectively improve the local luminous brightness on the light incident side and improve the optical effects of the optical element and the display device.

An optical element according to an embodiment of the present invention includes a light guide plate having a bottom edge, a first side edge, and a second side edge. The bottom edge is connected to the first side edge and the second side edge respectively. ; A light bar, arranged on the bottom edge of the light guide plate, and the light bar is arranged with multiple light-emitting points in the direction of the bottom edge of the light guide plate; a light-shielding glue, arranged on the bottom edge of the light guide plate; The bottom edge of the light plate covers the light bar and part of the light guide plate; wherein, the light-shielding glue has a width in a direction perpendicular to the bottom edge of the light guide plate, and the width starts from the The center position of the bottom edge gradually becomes smaller toward the first side or the second side.

In the above optical element, the light-shielding glue is arranged symmetrically with respect to the center position of the bottom edge.

The above-mentioned optical element, wherein the light-emitting points from the first side to the center position are marked L1, L2, L3...Lx..., x is a positive integer, wherein the light-emitting point Lx has a lamp The number of intersection points of the front optical path is a(x), and a(x)=x-1.

The above-mentioned optical element, wherein the light-shielding glue has an edge away from the bottom edge of the light guide plate, each of the light-emitting points has a light-emitting surface, and the edge reaches the light-emitting point corresponding to the center position. The light-emitting surface of the point has a first width H, the edge to the light-emitting surface corresponding to the light-emitting point Lx has a second width H(x), the light path intersection point in front of the lamp at the center position The number is a (center), where H(x)=H*a(x)/a(center).

The above-mentioned optical element, wherein the number of the light-emitting points is n. When n is an even number, the number of intersection points of the light path in front of the lamp at the center position is a (center), and a (center) = (n- 2)/2.

The above-mentioned optical element, wherein the number of the light-emitting points is n. When n is an odd number, the number of intersection points of the light path in front of the lamp at the center position is a (center), and a (center) = (n- 1)/2.

In the above optical element, the edge is formed by fitting the second width of the light-shielding glue.

The above optical element, wherein if the second width of the light-shielding glue at a certain light-emitting point is 0, then the second width of the light-shielding glue is set to correspond to the adjacent light-emitting point. the second width of the light-shielding glue.

In the above optical element, the light-shielding glue has an edge away from the bottom edge of the light guide plate, and the edge is in the shape of a step, a smooth curve, or a diagonal line.

The above-mentioned optical element, wherein the light-shielding glue includes a connected first part and a second part, the first part covers the light bar, and the second part covers the guide On the light plate, the second part has a width in a direction perpendicular to the bottom edge of the light guide plate, and the width extends from the center of the bottom edge to the first side or the second side. The side direction gradually becomes smaller.

In the above optical element, the light-emitting point is arranged symmetrically with respect to the central position.

A display device according to an embodiment of the present invention includes a display panel; and any optical element as described above.

In the above display device, the optical element is used to emit light. The light is incident on the display panel and then reflected from the display panel to the optical element and then emitted.

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the invention.

The structural principle and working principle of the present invention will be described in detail below in conjunction with the accompanying drawings:

Figure 1 is a schematic structural diagram of an optical element according to an embodiment of the present invention. As shown in FIG. 1 , the optical element 100 of the present invention includes a light guide plate 101 , a light bar 102 and a light-shielding glue 103 . The light guide plate 101 at least includes a bottom edge 1011, a first side 1012 and a second side 1013. The bottom edge 1011 is connected to the first side 1012 and the second side 1013 respectively. The bottom edge 1011 has a center position O. The light bar 102 is disposed on the bottom edge 1011 of the light guide plate 101. The light bar 102 has a plurality of light-emitting points arranged along the direction of the bottom plate 1011 of the light guide plate 101. The light-shielding glue 103 is disposed on the bottom edge 1011 of the light guide plate 101 and covers the light bar 102 and part of the light guide plate 101. The light-shielding glue 103 has a width in a direction perpendicular to the bottom edge of the light guide plate 101, and the width starts from the bottom edge. The center position O of 1011 gradually becomes smaller toward the first side 1012 or the second side 1013.

Figure 2 is a schematic cross-sectional view along A-A' in Figure 1. As shown in Figures 1 and 2, the light-shielding glue 103 includes a connected first part 1032 and a second part 1033. The first part 1032 covers the light bar 102, and the second part 1033 covers the light guide plate 101. On the top, the width of the second portion 1033 in the direction perpendicular to the bottom edge 1011 of the light guide plate 101 gradually decreases from the center position O of the bottom edge 1011 toward the first side 1012 or the second side 1013 . In this embodiment, the light-shielding glue 103 is arranged symmetrically with respect to the center position O of the bottom edge 1011, but it is not limited to this. In actual operation, the light bar 102 also includes a circuit board (not shown) on which a plurality of light-emitting points are disposed.

In the present invention, from the first side 1012 to the center position O of the bottom plate 1011, the light bar 102 is arranged with a plurality of light-emitting points, which are respectively marked L1, L2, L3...Lx..., x is a positive integer. Specifically, as shown in Figure 1, taking the light bar 102 on the left side of the center position O as an example, multiple light-emitting points L1, L2...Lx... are arranged in the direction from left to right as shown in the figure. Each light-emitting point L1, L2...Lx... L2…Lx… all have luminous surfaces S. Draw lines based on the luminous angles of luminous points L1, L2…Lx…. There will be different numbers of intersections in front of the luminous points L1, L2…Lx…. These intersections are defined as light path intersections in front of the lamp. Points. Among them, the number of intersection points of the light path in front of the x-th light-emitting point is a(x), and a(x) = x-1. The number of intersection points of the light path in front of the lamp can be used to simulate the brightness in front of the lamp. It can be seen that the closer to the center position O, the more intersection points of the light path in front of the light emitting point, and the brightness of the light guide plate 101 here is also greater. , Therefore, in order to better improve the problem of local brightness on the light incident side, the closer to the center position O, the wider the width of the light-shielding glue 103. However, in an actual display device, the light-shielding glue 103 cannot extend to the display area. That is to say, the light-shielding glue 103 has an edge 1031 away from the base plate 101 of the light guide plate 101, and there should be a certain distance between the edge 1031 and the display area. Therefore, the width of the light-shielding glue 103 has a limit value.

In the optical element 100 of the present invention, on the light incident side, the light-shielding glue 103 covering the light guide plate 101 is arranged to have a width in a direction perpendicular to the bottom edge 1011 of the light guide plate 101 from the center position O of the bottom edge 1011 to the first The direction of the side 1012 or the second side 1013 gradually becomes smaller. In this way, the light guide plate 101 at different positions is shielded by the light-shielding glue 103 of different widths, and the brightness in front of each light-emitting point is adjusted to achieve a uniform brightness effect and improve The problem of partial brightness on the light incident side.

In the embodiment shown in FIG. 1 , the number n of light-emitting points in the light bar 102 is an even number, n=2k, k is a positive integer, the light-emitting point corresponding to the center position O is Lk, and the light path in front of the light of the light-emitting point Lk The number of intersections is a (center), corresponding to the light-emitting point Lk. The light-emitting surface S from the edge 1031 of the light-shielding glue 103 to the light-emitting point Lk has a first width H. In one embodiment, the first width H may correspond to the light-shielding glue. 103 width limit. Corresponding to other light-emitting points, the light-emitting surface S from the edge 1031 of the light-shielding glue 103 to the x-th light-emitting point Lx has a second width H(x), where H(x)=H*a(x)/a(center) . For this embodiment, since the number n of light-emitting points is an even number, a (center) = k/2-1 = (n-2)/2. In summary, it can be concluded that the second width H(x) of the light-emitting surface S from the edge 1031 of the light-shielding glue 103 to the x-th light-emitting point Lx satisfies the following formula: H(x)=2H*(x-1)/(n -2) (Formula 1).

In this embodiment, the first side 1012 is perpendicular to the bottom side 1011, so it can be considered that the light-emitting surface S from the edge 1031 of the light-shielding glue 103 to the light-emitting point Lk has a first width in the extending direction of the first side 1012. The edge 1031 of the light-shielding glue 103 to the bottom edge 101 of the light guide plate 101 corresponding to the light-emitting point Lk may have a third width (not labeled) in the extending direction of the first side 1012, where the first width H ≥ the third width. In actual operation, the light-emitting surface S of the light-emitting point Lk can be close to the bottom edge 1011 of the light guide plate 101. At this time, the first width H is equal to the third width.

In this embodiment, the light bar 102 located on the right side of the center position O is also arranged with multiple light-emitting points. The multiple light-emitting points on the right side can be arranged symmetrically with the multiple light-emitting points on the left side, so that from the second side 1013 to the center of the base plate 1011 At position O, the multiple light-emitting points arranged on the light bar 102 can also be marked as L1, L2, L3...Lx..., x is a positive integer. According to the same formula, the width from the edge of the light-shielding glue 103 on the right side of the center position O to the light-emitting surface of each light-emitting point can be calculated. In another embodiment, if the light bar 102 is symmetrically arranged along the center position O, the width of the light-shielding glue 103 on the left side of the center position O can also be mirrored to obtain the width of the entire light-shielding glue 103. The light-shielding glue 103 is also relative to the center position O. Symmetrical setup. In another embodiment, the plurality of light-emitting points on the right side can also be arranged asymmetrically with the plurality of light-emitting points on the left side, and the spacing between the light-emitting points can be arranged uniformly or unevenly. The present invention does not use this method. is limited.

Figure 3 is a schematic structural diagram of an optical element according to another embodiment of the present invention. The difference between the embodiment shown in FIG. 3 and the embodiment shown in FIG. 1 is that the number n of light-emitting points in the light bar 102 is an odd number, n=2k-1, and k is a positive integer. As shown in Figure 3, the luminous point corresponding to the center position O is Lk, and the number of light path intersections in front of the luminous point Lk is a (center), a (center) = k-1 = (n-1)/2 . Corresponding to each light-emitting point Lx, the second width H(x)=H*a(x)/a(center) of the light-emitting surface S from the edge 1031 of the light-shielding glue 103 to the x-th light-emitting point Lx, so the second width H (x) satisfies the following formula: H(x)=2H*(x-1)/(n-1) (Formula 2).

In this embodiment, the light bar 102 located on the right side of the center position O is also arranged with multiple light-emitting points. The multiple light-emitting points can be arranged symmetrically with the multiple light-emitting points on the left side, so that from the second side 1012 to the center of the base plate 1011 At position O, the multiple light-emitting points arranged on the light bar 102 can also be marked as L1, L2, L3...Lx..., x is a positive integer. According to the same formula, the width from the edge of the light-shielding glue 103 on the right side of the center position O to the light-emitting surface of each light-emitting point can be calculated. In another embodiment, if the light bar 102 is symmetrically arranged along the center position O, the width of the light-shielding glue 103 on the left side of the center position O can also be mirrored to obtain the width of the entire light-shielding glue 103. The light-shielding glue 103 is also relative to the center position O. Symmetrical setup.

In actual operation, for the first light-emitting point L1, since the number of light path intersections a(1) in front of the lamp is 0, it is calculated that the second width H(1) of the light-shielding glue 103 corresponding to this point is equal to 0. As shown in Figure 1 and Figure 3, if the second width of the light-shielding glue corresponding to a certain light-emitting point (for example, the first light-emitting point L1) is calculated to be 0, then the light-shielding glue corresponding to the first light-emitting point L1 can be The second width H(1) of the glue 103 is set to the second width H(2) of the light-shielding glue 103 corresponding to its adjacent light-emitting point (L2). In actual operation, the second width at the first light-emitting point can also be maintained at 0 without additional settings. Since the second width is only the width of the light-shielding glue 103 covering the light guide plate 101, even if the second width is 0, the light-shielding The glue 103 can also cover the light bar 102 through the first part 1032 and provide a certain light-shielding effect.

Figure 4 is a schematic diagram of fitting the edge of the light-shielding glue according to an embodiment of the present invention. As shown in Figure 4, since the light-emitting points are discretely arranged, the second width H(x) of the light-shielding glue 103 calculated by the above formula 1 or formula 2 makes the edge 1031 of the light-shielding glue 103 have a stepped shape (as shown in the figure) shown by the dotted line). In order to facilitate the production process, the edge 1031 of the light-shielding glue 103 can be fitted. Figure 4 shows that each point on the step edge is used to fit a smooth boundary (as shown by the solid line in the figure), so that the light-shielding glue 103 The actual second width may be the result after fitting processing. Of course, a stepped light-shielding glue edge can also be formed directly based on the calculation results, or a smooth boundary can be fitted to each point in the middle of the step, thereby forming a smooth curved or diagonal light-shielding glue edge.

FIG. 5 is a schematic structural diagram of a display device according to an embodiment of the present invention. As shown in FIG. 1 , FIG. 3 and FIG. 5 , the display device of the present invention is a reflective display device, which includes a display panel 201 and the optical element 100 in the above embodiment. The optical element 100 is located on the display panel 201. The optical element 100 is used to emit light L. The light L is incident on the display panel 201 through the guidance of the light guide plate 101, and is reflected back from the display panel 201 through reflection by the display panel 201. Optical element 100 is ejected later.

Of course, the specific structures of the display panel, optical elements, and other film layer structures between them will not be described in detail here.

In summary, according to embodiments of the present invention, setting the width of the light-shielding glue to correspond to the position of the light-emitting point can reduce the light-emitting brightness of the local light-incident side and improve the optical effects of optical elements and display devices.

Of course, the present invention can also have various other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention. However, these corresponding changes and All deformations shall fall within the protection scope of the patent application attached to the invention.

100:Optical components 101:Light guide plate 1011: Bottom edge 1012: first side 1013:Second side 102:Light strip 103:Shading glue 1031: Edge 1032:Part 1 1033:Part 2 200:Display device 201:Display panel L1, L2, L3, Lx: luminous point O: central location S: Luminous surface L:Light H: first width H(x): second width Lk: Luminous point

Figure 1 is a schematic structural diagram of an optical element according to an embodiment of the present invention. Figure 2 is a schematic cross-sectional view along A-A' in Figure 1. Figure 3 is a schematic structural diagram of an optical element according to another embodiment of the present invention. Figure 4 is a schematic diagram of fitting the edge of the light-shielding glue according to an embodiment of the present invention. FIG. 5 is a schematic structural diagram of a display device according to an embodiment of the present invention.

100:Optical components

101:Light guide plate

1011: Bottom edge

1012: first side

1013:Second side

102:Light strip

103:Shading glue

1031: Edge

1032:Part 1

1033:Part 2

L1, L2, L3, Lx: luminous point

O: central location

S: Luminous surface

H: first width

H(x): second width

Lk: Luminous point

Claims (13)

An optical component including: A light guide plate has a bottom edge, a first side and a second side, and the bottom edge is connected to the first side and the second side respectively; A light bar is provided on the bottom edge of the light guide plate, and the light bar has a plurality of light-emitting points arranged along the direction of the bottom edge of the light guide plate; A light-shielding glue is provided on the bottom edge of the light guide plate and covers the light bar and part of the light guide plate; Wherein, the light-shielding glue has a width in a direction perpendicular to the bottom edge of the light guide plate, and the width extends from the center of the bottom edge to the first side or the second side. The direction gradually becomes smaller. The optical element according to claim 1, wherein the light-shielding glue is arranged symmetrically with respect to the center position of the bottom edge. The optical element according to claim 1, wherein the light-emitting points from the first side to the center position are marked L1, L2, L3...Lx..., x is a positive integer, wherein the light-emitting points Point Lx has a light path intersection number a(x) in front of a lamp, and a(x) = x-1. The optical element according to claim 3, wherein the light-shielding glue has an edge away from the bottom edge of the light guide plate, each of the light-emitting points has a light-emitting surface, and the edge reaches the corresponding center The light-emitting surface of the light-emitting point at the position has a first width H, the edge to the light-emitting surface corresponding to the light-emitting point Lx has a second width H(x), and the light-emitting surface at the center position The number of light path intersections in front of the lamp is a (center), where H(x)=H*a(x)/a(center). The optical element according to claim 3 or 4, wherein the number of the light-emitting points is n. When n is an even number, the number of intersection points of the light path in front of the lamp at the center position is a (center), and a (center)=(n-2)/2. The optical element according to claim 3 or 4, wherein the number of the light-emitting points is n. When n is an odd number, the number of intersection points of the light path in front of the lamp at the center position is a (center), and a (center)=(n-1)/2. The optical element according to claim 4, wherein the edge is formed by fitting the second width of the light-shielding glue. The optical element according to claim 4, wherein if the second width of the light-shielding glue at a certain light-emitting point is 0, then the second width of the light-shielding glue is set to its corresponding value. The second width of the light-shielding glue corresponding to the light-emitting point. The optical element according to claim 1, wherein the light-shielding glue has an edge away from the bottom edge of the light guide plate, and the edge is in the shape of a step, a smooth curve, or a diagonal line. The optical element according to claim 1, wherein the light-shielding glue includes a connected first part and a second part, the first part covers the light bar, and the second part Covered on the light guide plate, the second part has a width in a direction perpendicular to the bottom edge of the light guide plate, and the width extends from the center of the bottom edge to the first side. Or the direction of the second side gradually becomes smaller. The optical element according to claim 1, wherein the light-emitting point is arranged symmetrically with respect to the central position. A display device including: a display panel; An optical element as described in any one of claims 1 to 11, wherein the optical element is located on the display panel. The display device according to claim 12, wherein the optical element is used to emit light, and the light is incident on the display panel and then reflected from the display panel to the optical element and then emitted.

Images