TWI471650B - Back light module and display device - Google Patents

Description

Backlight module and display device

The invention relates to a backlight module, in particular to a backlight module which is arranged by a light source to improve a dark band phenomenon.

Generally used in the liquid crystal display of the information device, the backlight module structure of the direct-lit or edge-lit type can be selected according to the actual design requirements. In the direct type backlight module, the corner of the display device is degraded due to lack of a dark band region caused by light irradiation.

In the prior art, a diffusing plate is usually used to uniformly disperse the passing light. Among them, in order to enhance the effect of light diffusion and the uniformity of light mixing, the gap between the light source and the diffusion plate must be increased, or the number of diffusion plates used must be increased. However, such a structural design not only has a rather limited effect, but also causes an increase in the thickness of the backlight module, which is contrary to the original design of the liquid crystal display.

In addition, in order to allow the display device to receive more light from the backlight module, more illumination sources need to be disposed in the backlight module. However, in a backlight module using a light-emitting diode as a light-emitting source, the manufacturing cost of the light-emitting diode is expensive, which is unfavorable economical consideration.

In view of the above, an object of the present invention is to provide a backlight module that enhances the supply of light sources at the corners of the display device by changing the arrangement of the light sources on the backlight module. Still another object of the present invention is to reduce the number of light sources to reduce production costs.

To achieve the above objective, the present invention provides a backlight module including a substrate, at least one light strip, and a plurality of optical elements. The substrate has a first side. The light strip has a plurality of light sources and includes a first area and a second area. The first area is adjacent to the first side, and the light source in the first area has a first spacing. The second region is adjacent to the first region, and the light source in the second region has a second pitch, wherein the first pitch is smaller than the second pitch. The optical component is disposed above each of the light sources, wherein the light incident surface of each of the optical components includes a first concave curved surface that is recessed away from the light source, and the light emitting surface of the optical component includes a second concave curved surface that is recessed toward the light source.

The present invention further provides a display device using the above backlight module, wherein a display panel is disposed on the backlight module.

Since the spacing between adjacent light sources near the first side and the second side of the substrate is smaller than the spacing between adjacent light sources in other areas, and the light source is further uniformly diffused through the optical element, the display device regions are sufficiently The light source from the backlight module is obtained. As such, it is conventional to show that the brightness unevenness of the screen will be improved.

The preferred embodiment is described in conjunction with the drawings.

See Figures 1 and 2. The display device 1 of the preferred embodiment of the present invention includes a backlight module 10, an optical film layer 20, and a display panel 30. The backlight module 10 includes a substrate 50, an optical reflective layer 55, and two light strips. 100. A plurality of light sources 110 and a plurality of optical elements 140.

The substrate 50 is used to carry and position the optical components in the backlight module 10, and includes two short side plates 51, 52, two long side plates 53, 54 and a bottom plate 56. In a specific embodiment, the bottom plate 56 The aspect ratio is 16:9, wherein the short side plates 51, 52 are defined in the vertical direction of the second drawing, and the long side plates 53, 54 are defined in the horizontal direction of the second drawing, the short side plates 51, The 52 and the long side plates 53, 54 are connected to the bottom plate 56, and the plane normal vectors may be perpendicular or not perpendicular to each other. In general, when the display device 1 of the present invention is erected, the short side plates 51, 52 are located on the left and right sides of the user, and the long side plates 53, 54 are located on the upper and lower sides of the user (the following description will be The first side represents the short side panel 51 and the second side represents the short side panel 52). The optical reflective layer 55 is disposed on the inner side of the substrate 50 to reflect light to increase the light diffusion effect. The substrate 50 is provided with a driving circuit, and the other components can be electrically connected to operate the backlight module 10.

The two light bars 100 are disposed on the bottom plate 56 in a direction parallel to the long side plates 53, 54. Each of the light strips 100 includes a first region I, a second region II, a third region III, a fourth region IV, a fifth region V, a sixth region VI, a seventh region VII, and a first region. The first intermediate area VIII and the second intermediate area IX. The first area I is adjacent to the first side 51, the second area II is adjacent to the first area I, the third area III is adjacent to the second side 52, and the fourth area IV is adjacent to the third area III, the fifth area V Between the second region II and the fourth region IV, the fifth region V and the second region II have a sixth region VI and a first intermediate region VIII, and the fifth region V and the fourth region IV have a Seven areas VII and second intermediate area IX. In addition, in this embodiment, the substantially central position of the fifth region V has a central axis C passing through, wherein the central axis C is equal to the distance between the short sides of the light bar 100, the light bar 100 is equally divided, and each region Along the central axis C is a mirror image distribution, that is, the first region I corresponds to the third region III, the second region II corresponds to the fourth region IV, the sixth region VI corresponds to the seventh region VII, and the first intermediate region VIII corresponds to the second intermediate region IX, the left portion of the fifth region V corresponds to the right portion of the fifth region V. However, in other embodiments, the central axis C does not necessarily traverse a specific area of the light bar 100, and the areas on the light bar 100 are not necessarily mirror images along the central axis C. The light strip 100 is, for example, a printed circuit board (PCB) having a light source driving circuit that causes the light source 110 to emit light after receiving the electrical signal. The light source 100 is disposed substantially in a line along the long axis of the light strip 100. The single light strip 100 can accommodate one or a plurality of linear arrays of light sources. In addition, the light sources 110 of the single light source array have unequal spacing between the designs, but the distances of the light sources 110 in the same "area" are the same, that is, the density d of the light source 110 is the same, and the distance between the light sources 110 in the "intermediate area" is not For example, the density d of the light source 110 may be a fixed value or a change value, wherein the pitch of the light source 110 refers to the shortest distance between the centers of the two adjacent light sources 100, which is greater than zero.

The region of the first region I-light strip 100 that is closest to the first side edge 51 has a plurality of light sources 110 that form more than one light source 110 spacing therebetween, but all have a common light source 110 pitch p1. The second region II is adjacent to the first region I, has a plurality of light sources 110, and forms more than one light source 110 spacing therebetween, but has a common light source 110 pitch p2, wherein p1 is smaller than p2, in other words, the first region I The density d of the light source 110 is greater than the density d of the second region II light source 110. The portion adjacent to the first region I and the second region II is a shared light source 110, and the center of the shared light source 110 is a switching boundary of the pitch p1 and the pitch p2.

The region of the third region III light strip 100 closest to the second side 52 has a plurality of light sources 110 forming more than one light source 110 spacing therebetween, but each having a common light source 110 pitch p3. The fourth region IV adjacent to the third region III has a plurality of light sources 110 forming more than one light source 110 spacing therebetween, but each having a common light source 110 pitch p4, wherein p3 is smaller than p4, in other words, the third region III The density d of the light source 110 is greater than the density d of the fourth region IV source 110. The portion adjacent to the third region III and the fourth region IV is a shared light source 110, and the center of the shared light source 110 is a transition boundary between the pitch p3 and the pitch p4. In this embodiment, the first region I and the third region III have the same number of pitches, and the pitch p1 is equal to p3; the second region II and the fourth region IV have the same number of pitches, and the pitch p2 is equal to p4, but is not limited thereto. . In other embodiments, the pitch p1 and the pitch p3 may not be equal, the pitch p2 and the pitch p4 may be unequal, or the pitch p1 may be different from the pitch p2~p4. In short, the number of distances between the various regions that are mirrored along the central axis C may be the same or different. In addition, the second region II of the light bar 100 may also be combined with the fourth region IV, or the light bar 100 may include only the first region I and the second region II, etc., depending on the overall optical design.

The fifth region V is interposed between the second region II and the fourth region IV, and has a plurality of light sources 110, and one or more light source 110 spaces are formed therebetween, but all have a common light source 110 pitch p5. In this embodiment, the fifth region V is separated from the second region II and the fourth region IV by other regions, and the fifth region V is located at the center of the light bar 100, and the central axis C traverses the center of the fifth region V, and the spacing P5 is smaller than the pitch p2 and the pitch p4, and the density d of the light source 110 of the fifth region V is relatively larger than the second region II and the fourth region IV, and the density d of the light source 110 from the first side 51 to the second side direction 52 is substantially The arrangement of dense-sparse-density-sparse-dense is presented. In other embodiments, the central axis C does not traverse the center of the fifth region V, the pitch p5 may be equal to or not equal to the pitch p1~p4, and the fifth region V may be adjacent or even combined with the second region II and the fourth region IV, or even There is no fifth region V...etc., depending on the design of the overall optics.

The sixth region VI is interposed between the second region II and the fifth region V, and has a plurality of light sources 110, and one or more light source 110 spaces are formed between each other, but all have a common light source 110 pitch p6, wherein the pitch p6 is greater than Pitch p1 and pitch p2. The seventh region VII is between the fourth region IV and the fifth region V, and has a plurality of light sources 110, and one or more light source 110 spaces are formed between each other, but all have a common light source 110 pitch p7, wherein the pitch p7 is greater than Pitch p3 and pitch p4. In this embodiment, the sixth region VI is adjacent to the second region II, the seventh region VII is adjacent to the fourth region IV, the pitch p6 is equal to the pitch p7, and the pitch p6 and the pitch p7 are both greater than the pitch p1~p5, In other words, the light source density d of the sixth region VI and the seventh region VII is larger than other regions, and the density d of the light source 110 from the first side 51 to the second side direction 52 is also dense-sparse-dense-sparse-density. Arrangement. In other embodiments, the sixth region VI and the second region II may not be adjacent, and the seventh region VII and the fourth region IV may not be adjacent, and the relationship between the pitch p6 and the pitch p7 and the other pitches p1 to p5 may be equal or unequal. The sixth area VI and the seventh area VII may also be combined with other areas, even without the sixth area VI and the seventh area VII, etc., depending on the overall optical design.

The first intervening zone VIII is interposed between the fifth region V and the sixth region VI, and has a plurality of light sources 110, which form one or more light source 110 spacings therebetween, and may have the same or different light source 110 spacing, but average The distance between the light sources is the pitch p8. The second intervening area IX is interposed between the fifth area V and the seventh area VII, and has a plurality of light sources 110, which form one or more light source 110 spacings therebetween, and may have the same or different light source 110 spacing, but average The distance between the light sources is the pitch p9. In this embodiment, the distance between the first intermediate area VIII and the second intermediate area IX is the same, the pitch p8 and the pitch p9 are the same, and the first intermediate area VIII is adjacent to the fifth area V and the sixth area VI, and second. The intermediate area IX is adjacent to the fifth area V and the sixth area VII. An intermediary zone can be thought of as a single zone that is merged by multiple zones. In other embodiments, the distance between the first intermediate area VIII and the second intermediate area IX may be varied, such as increasing, decreasing, equal or irregular, and the spacing p8 and the spacing p9 and the spacing p1~p7 are not specific. The relationship between the first intermediate area VIII or the second intermediate area IX may be between the adjacent area spacings p5~p7 or any value, and the first intermediate area VIII or the second intermediate area IX may also be combined with other areas. There is even no first intermediate zone VIII or second intermediate zone IX..., etc., depending on the overall optical design. The concept of the intermediation zone can be extended, for example, by inserting an intervening zone between the second zone II and the sixth zone VI or between the fourth zone IV and the seventh zone VII.

In a specific embodiment, the display device 1 to which the backlight module 10 is applied has a size of 31.5 Å, a pitch p1 and a pitch p3 of 40 mm, a pitch p2 and a pitch p4 of 50 mm, a pitch p6 and a pitch p7 of 60 mm, a pitch p8 and a pitch. The p9 is 50 mm, the pitch p5 is 40 mm, and the density d of the light source 110 from the first side 51 to the second side direction 52 is also in a dense-sparse-dense-sparse-dense arrangement. But it is not limited to this. It should be noted that in the present embodiment, although the pitches p1 to p9 on the two sides of the central axis C of the light bar 100 are mirror-symmetrical to each other, they are not limited thereto. Those skilled in the art can adjust the spacing between adjacent light sources in accordance with the basic spirit of the present embodiment.

The optical component 140 is disposed on each of the light sources to increase the light diffusion angle, to reduce the number of light sources used, and to adjust the light shape to reduce the light mixing distance, and achieve the effect of homogenization. The detailed features will be described later. The optical film layer 20 is disposed above the substrate 50 with respect to the backlight module 10, and the display panel 30 is disposed above the optical film layer 20. The optical film layer 20 and the display panel 30 of the present invention are well-known components in the art, and are not emphasized in the present invention, and are not described herein.

See Figure 3. Figure 3 is a graph showing the distribution density d of the light source per unit length relative to the position of the light strip 100 in a preferred embodiment of the invention. Overall, in the above embodiment of the present invention, the distribution density d of the unit length light source has a variation, wherein the distribution density d of the unit length light source is dense from the direction of the first side 51 of the substrate 50 toward the second side 52. Sparse, dense, sparse, and dense changes. In detail, from the first region I to the sixth region VI, the distribution density d of the unit length light source is gradually decreased; from the sixth region IV to the fifth region V, the distribution density d of the light source per unit length is gradually increased; from the fifth region V to In the seventh region VII, the distribution density d of the light source per unit length is gradually decreased; from the seventh region VII to the second region II, the distribution density d of the light source per unit length is gradually increased.

Benefiting from the arrangement of the light sources 110 on the two strips 100, in addition to maintaining the central brightness, the display panel 30 can also increase the received light by its four corners. Therefore, in the prior art, the case where the four corners have a dark band area can be improved. In an experimental data, the center brightness of the display panel 30 is 105%, and the uniformity is 65%, where the uniformity is defined as the ratio of the darkest point to the brightest point of the display panel.

Please refer to Figure 4. Fig. 4 is a top plan view showing a backlight module 10' according to another embodiment of the present invention. For the sake of simplicity, the same or similar components of the backlight module 10' as the backlight module 10 will be given similar reference numerals, and their features will not be described again.

The form of the light source on the light bar 100' is not limited by the embodiment shown in Fig. 2. In another embodiment, the adjacent fifth region V is the sixth region VI and the seventh region VII, and there is no intermediate region first intermediate region VIII and second intermediate region IX of the previous embodiment.

In a specific embodiment, the display device (not shown in FIG. 4) to which the backlight module 10' is applied has a size of 31.5 Å, a pitch p5 of 50 mm, a pitch p6 and a pitch p7 of 70 mm, and a pitch p2 and a pitch p4. 40 mm, the pitch p1 and the pitch p3 are 30 mm, but are not limited thereto. It is to be noted that, in the present embodiment, although the pitches on both sides of the center axis C of the light bar 100' are symmetrical to each other, it is not limited thereto. Those skilled in the art can adjust the spacing between adjacent light sources in accordance with the basic spirit of the present embodiment.

In an experimental data, the center panel brightness of the display panel (not shown in FIG. 4) using the backlight module 10' is 100%, and the uniformity is 70%. The uniformity is defined as the darkest display panel. The ratio of the point to the brightest point.

See Figure 5. 5 is a top view showing a part of components of a backlight module 10" according to another embodiment of the present invention. For the sake of simplicity, components of the backlight module 10" that are the same as or similar to the backlight module 10 will be given similar reference numerals. And its features will not be explained.

In order to further improve the case where the dark band area of the display device (not shown in FIG. 5) of the backlight module 10" is applied, the center axis C of the two light bars 100 is respectively from the middle of the two long side plates 53, 54 The line connecting the 541 is shifted to the left and to the right. As shown in Fig. 5, the line C of the light bar (first light bar) 100 located above the drawing is connected with respect to the midpoints 531 and 541. The left offset, and the light bar (second light bar) 100 located below the plane is offset to the right by the line C with respect to the line connecting the midpoints 531, 541. Thus, the light bar located above the drawing surface (first The short side of the light strip 100 is closer to the first side 51 than the short side of the light strip (second light strip) 100 located below the drawing, wherein the light strip (first light strip) 100 above the drawing is short a first distance L1 between the side and the first side 51, and a second distance L2 between the short side of the light strip 100 (second light strip) below the drawing and the first side 51, wherein the first distance The distance L1 is smaller than the second distance L2.

The structural features of the optical component 140 of the present invention will be further illustrated. Referring to FIG. 6, FIG. 6 is an enlarged view of a portion of the components of FIG. 1, in which only a single optical component 140, a single light source 110, and a portion of the substrate 50 are shown. The optical component 140 includes a first concave curved surface 141, a light exit surface 143, a bottom surface 145, and two or more support members 147. The first concave curved surface 141 faces the light exit surface of the light source 110, wherein light from the light source 110 enters the optical element 140 via the first concave curved surface 141. That is, the first concave curved surface 141 is the light incident surface of the optical element 140, but should not be limited thereto. Light may also enter the optical element 140 via the bottom surface 145 of the optical element 140. The first concave curved surface 141 is recessed from the bottom surface 145 in a direction away from the light emitting surface of the light source 110, and as shown in Fig. 6, the first concave curved surface 141 has substantially a semi-long elliptical outer shape. Further, the first concave curved surface 141 is axisymmetric with respect to the center of symmetry M of the optical element 140. In other words, the cross-section of the first concave curved surface 141 is a circular or elliptical shape (detail features of the first concave curved surface 141 will be detailed in the description of Fig. 10A).

The light exit surface 143 faces the optical film layer 20 (Fig. 1), that is, on the side of the optical element 140 opposite to the light source 110. The light exit surface 143 includes a second concave curved surface S1 and a convex curved surface S2. In this embodiment, the second concave curved surface S1 and the convex curved surface S2 are axisymmetric to the center of symmetry M, wherein the center of symmetry M passes through the center of the light source 110 and the substantial center of the optical element 140. The second concave curved surface S1 is recessed toward the light source 110, and an angle θ ₁ between its normal line and the direction X is 90 to 180 degrees. The convex curved surface S2 surrounds the outer side of the second concave curved surface S1 and includes a first light emitting surface S21 and a second light emitting surface S22. The first light-emitting surface S21 is adjacent to the second concave curved surface S1, wherein an angle θ ₂ between the normal line of the first light-emitting surface S21 and the direction X is 0 to 90 degrees. The second light exit surface S22 S21 adjacent to a first side away from the light exit surface S1 of the second concave curved surface, wherein the angle θ between the angle between the normal line X and the second direction of the light receiving surface S22 of -90 degrees from 0 to ₃ The direction X is extended from the center of symmetry M of the optical element 140 toward the outside of the optical element 140 and parallel to the direction of the substrate 50, as shown in FIG.

The bottom surface 145 is located between the first concave curved surface 141 and the second light-emitting surface S22, and the bottom surface 145 is coupled to the substrate 50 by the support member 147. In order to make the light of the light source 110 enter the optical component 140 via the first concave curved surface 141, in this embodiment, the height H of the support member 147 is equal to the distance from the light exit surface to the substrate 50, so that the bottom surface 145 is located at the light source 110. The plane where the light surface is located. Further, the support member 147 is a cylinder or a vertebral body having a width D1 between 2% and 20% of the width D2 of the bottom surface 145, but is not limited thereto. The arrangement position, shape and size of the support member 147 can be adjusted without affecting the diffusion of light.

It should be noted that, as shown in FIG. 6 , the first concave curved surface 141 and the light emitting surface 143 of the optical component 140 are curved surfaces having continuous curvature, and the bottom surface 145 of the optical component 140 is a plane facing the substrate 50 ; In addition, the width D3 of the opening of the first concave curved surface 141 facing the light source 110 is greater than or equal to the width D4 of the light source 110 to prevent the light source 110 and the optical element 140 from interfering with each other. The width D3 of the opening of the first concave curved surface 141 in one embodiment is between 100% and 150% of the width D4 of the light source 110.

After the light from the light source 110 passes through the optical element 140, the light shape thereof is adjusted to improve the uniformity of light irradiated to the optical film layer 20 (Fig. 1). Therefore, the image quality of the display device 1 (Fig. 1) will be further improved.

The structural features of the optical component 140 of the present invention may vary as desired. Exemplary embodiments of the optical component are exemplarily provided below: see Figures 7-9, in the optical components shown in Figures 7-9, Similar or corresponding elements of the optical element 140 (Fig. 6) will be given similar reference numerals, and the features already described will be omitted in the following description.

The shape of the first concave curved surface of the optical element may have the following changes: the first concave curved surface 241a of the optical element 240a has a substantially semicircular outer shape (Fig. 7A), and the first concave curved surface 241b of the optical element 240b substantially The first concave curved surface 241c having a semi-flat elliptical outer shape (Fig. 7B), the optical element 240c has substantially a wavy outer shape (Fig. 7C), or the first concave curved surface 241d of the optical element 240d has substantially a class A double elliptical shape in which a protrusion 247d is formed at its substantial center (Fig. 7D). In one embodiment, the optical element 240d is applied to a 3D display device, and the first concave curved surface 241d can receive two light rays emitted from the light source 110 disposed on opposite sides of the protrusion 247d. Different optical components can be utilized according to different requirements to optimize the light diffusion effect. For example, in one embodiment, when a plurality of light sources are disposed inside a single optical component, the optical component 240c of FIG. 7C or the optical component 240d of FIG. 7D will optimize the light diffusion effect.

In another embodiment, the first concave curved surface 241e of the optical element 240e is non-axisymmetric. As shown in FIG. 7E, the first concave curved surface 241e is skewed toward a specific direction to create different amounts of light on the left and right sides. The effect.

The shape of the bottom surface of the optical element may have the following variation: in the embodiment shown in Fig. 8A, the angle α between the tangent to the adjacent bottom surface 345a of the first concave curved surface 341a and the plane of the light exit surface of the light source 110 is equal to 90 degrees. At this time, the bottom surface 345a of the optical element 340a is aligned with the plane of the light exit surface of the light source 110. In the embodiment shown in FIG. 8B, the angle α between the tangent of the first concave curved surface 341b adjacent to the bottom surface 345b and the plane of the light exit surface of the light source 110 is less than 90 degrees, and at this time, the light source 110 is separated by the maximum exit angle. Light will not pass through the optical element 340b in the horizontal direction. At this time, the bottom surface 345b of the optical element 340b and the plane of the light exit surface of the light source 110 have an angle β to save the production material of the optical component and reduce the cost.

In the embodiment illustrated in Figure 9A, the bottom surface 445a of the optical element 440a further includes a plurality of recessed microstructures 449a, each having a semi-circular shape. In the embodiment illustrated in Figure 9B, the bottom surface 445b of the optical element 440b further includes a plurality of raised microstructures 449b, each having a semi-circular shape. In the embodiment illustrated in Figure 9C, the bottom surface 445c of the optical element 440c further includes a plurality of recessed microstructures 449c each having a half-hexagon shape. In the embodiment shown in FIG. 9D, the bottom surface 445d of the optical element 440d further includes a plurality of raised microstructures 449d each having a half-hexagon shape. The shape of the microstructure of the protrusion or depression may be any shape and is not limited to the above embodiment. In one embodiment, the raised or recessed microstructure has a depth or height that is less than 10% of the width of the bottom surface of the optical component. In addition, although in the above embodiments, the microstructures of adjacent protrusions or depressions are equidistant, the microstructures of the protrusions or depressions may also be distributed in an irregular shape.

Referring to FIG. 10A, FIG. 10A shows a bottom view of the light source 110 and the optical element 140 in accordance with a preferred embodiment of the present invention. In this embodiment, the light source 110 is a square, so that light from the light source 110 will be uniformly emitted in all directions. To match the light shape of the light source 110, the first concave curved surface 141 is preferably axisymmetric to the center of symmetry of the optical element 140. Referring to FIG. 10B, FIG. 10B shows a bottom view of the light source 210 and the optical element 240 in accordance with another embodiment of the present invention. In this embodiment, the light source 210 is a rectangle having a width W and a length L, so that the light source 210 will provide more light on one side of the length L and provide less light on one side of the width W. To match the light shape of the light source 210, the first concave curved surface 241 is preferably non-axisymmetric to the center of symmetry of the optical element 140 to provide a larger light-receiving area relative to the length L side of the light source 210, and relative to The side of the width W of the light source 210 provides a smaller light receiving area. In a specific embodiment, the open end of the first concave curved surface 241 is an ellipse having a short axis (first width) E ₁ and a long axis (second width) E ₂ , wherein one side of the width W of the light source 210 corresponds to The long axis (second width) E ₂ , and one side of the length L of the light source 210 corresponds to the short axis (first width) E ₁ . More specifically, one side of the width W of the light source 210 is disposed along the long axis (second width) E ₂ , and one side of the length L of the light source 210 is disposed along the short axis (first width) E ₁ . Referring to Figures 10A and 10B at the same time, the inventors of the present invention have found that the shape of the light-incident surfaces 141, 241 of the optical-shaped optical elements 140, 240, which are emitted by the light sources 110, 210, can further achieve uniform light output.

By arranging the light source of the backlight module, the uniformity of light at the four corners of the display device can be effectively improved, which helps to improve the image quality of the display panel. On the other hand, by diffusing the light from the light source by the optical element, the number of light sources of the backlight module can be further reduced to reduce the production cost.

Although the present invention has been disclosed in its preferred embodiments, it is not intended to limit the present invention, and it is possible to make some modifications and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

1. . . Display device

10, 10’. . . Backlight module

20. . . Optical film layer

30. . . Display panel

50. . . Substrate

51. . . Short side panel (first side)

52. . . Short side panel (second side)

53, 54, . . Long side panel

531, 541. . . midpoint

55. . . Optical reflective layer

56. . . Bottom plate

100, 100’. . . Light bar

110, 110', 210. . . light source

140, 240. . . Optical element

141, 241. . . First concave surface

143, 243. . . Glossy surface

145, 245. . . Bottom

147. . . supporting item

240a-240e. . . Optical element

241a-241e. . . First concave surface

247d. . . Bulge

340a-340b. . . Optical element

341a-341b. . . First concave surface

345a-345b. . . Bottom

440a-440b. . . Optical element

445a-445d. . . Bottom

449a-449d. . . microstructure

C. . . Central axis

d. . . Unit length light source distribution density

D1-D4. . . width

E ₁ . . . First width (short axis)

E ₂ . . . Second width (long axis)

H. . . height

L. . . The long side

L1. . . First distance

L2. . . Second distance

M. . . Symmetric center

P1-p9. . . spacing

S1. . . Second concave surface

S2. . . Convex surface

S21. . . First light surface

S22. . . Second light surface

W. . . Short side

θ ₁ , θ ₂ , θ ₃ . . . Angle

I. . . First area

II. . . Second area

III. . . Third area

IV. . . Fourth area

V. . . Fifth area

VI. . . Sixth area

VII. . . Seventh area

VIII. . . First intermediary area

IX. . . Second intermediary area

1 is a cross-sectional view showing a display device of a preferred embodiment of the present invention;

Figure 2 shows a top view of some of the components of Figure 1;

Figure 3 is a graph showing the distribution density of the light source per unit length with respect to the position of the light strip in accordance with a preferred embodiment of the present invention;

Figure 4 is a top plan view showing a part of components of a display device according to another embodiment of the present invention;

Figure 5 is a top plan view showing a part of components of a display device according to another embodiment of the present invention;

Figure 6 shows an enlarged view of some of the elements in Figure 1;

Figures 7A-7E show the structure of different types of optical components;

Figures 8A-8B show the structure of different types of optical components;

Figures 9A-9D show the structure of different types of optical components;

10A shows a bottom view of a light source and an optical component in accordance with a preferred embodiment of the present invention;

10B shows a bottom view of a light source and an optical element in another embodiment of the present invention.

10. . . Backlight module

50. . . Substrate

51. . . Short side panel (first side)

52. . . Short side panel (second side)

53. . . Long side panel

54. . . Long side panel

56. . . Bottom plate

100. . . Backlight module

110. . . light source

C. . . Central axis

P1-p9. . . spacing

I. . . First area

II. . . Second area

III. . . Third area

IV. . . Fourth area

V. . . Fifth area

VI. . . Sixth area

VII. . . Seventh area

VIII. . . First intermediary area

IX. . . Second intermediary area

Claims (29)

A backlight module includes: a substrate having a first side; at least one light strip having a plurality of light sources, comprising: a first region adjacent to the first side, the light source in the first region has a first spacing; and a second region adjacent to the first region, the light source in the second region having a second pitch, wherein the first pitch is less than the second pitch; and a plurality of optical components disposed on Above each of the light sources, each of the optical elements includes a first concave curved surface that is recessed away from the light source, and the optical elements include a second concave curved surface that is recessed toward the light source. The backlight module of claim 1, wherein the substrate has a second side, the second side is opposite to the first side, and the light strip comprises: a third area adjacent to the a second side, the light source in the third area has a third spacing; and a fourth area adjacent to the third area, the light source in the fourth area has a fourth spacing, wherein the third spacing is less than The fourth pitch. The backlight module of claim 2, wherein the first pitch is equal to the third pitch. The backlight module of claim 2, wherein the second pitch is equal to the fourth pitch. The backlight module of claim 2, wherein a fifth area is interposed between the second area and the fourth spacing, and the light source in the fifth area has a fifth spacing. The backlight module of claim 5, wherein the fifth area is adjacent to the second area and the fourth area. The backlight module of claim 5, wherein a sixth area is interposed between the fifth area and the second area, and the light source in the sixth area has a sixth spacing, the sixth spacing being greater than The second pitch and the fifth pitch. The backlight module of claim 7, wherein the sixth area is adjacent to the second area and the fifth area. The backlight module of claim 8, wherein the fifth area and the sixth area are a first intermediate area. The backlight module of claim 7, wherein a seventh area is interposed between the fifth area and the fourth area, and the light source in the seventh area has a seventh spacing, wherein the seventh spacing is greater than the The fourth pitch and the fifth pitch. The backlight module of claim 10, wherein the seventh region is adjacent to the fourth region and the fifth region. The backlight module of claim 10, wherein the sixth pitch is equal to the seventh pitch. The backlight module of claim 10, wherein the fifth area and the seventh area are a second intermediate area. The backlight module of claim 1, wherein the first side and the second side are respectively two short side plates of the substrate, and the substrate further comprises two long side plates connected to the two short sides. a side panel, wherein the light strip is parallel to the two long side panels. The backlight module of claim 1, wherein the backlight module comprises a first light strip and a second light strip, the second light strip is adjacent to the first light strip, wherein the first light strip The strip has a first distance from the first side, and the second strip has a second distance from the first side, the first distance being less than or equal to the second distance. The backlight module of claim 1, wherein the optical component further comprises a bottom surface, the first concave curved surface is recessed from the bottom surface away from the light source, wherein the intersection of the first concave curved surface and the bottom surface It is located on the plane of the light exit surface of the light source. The backlight module of claim 16, wherein the bottom surface comprises a plurality of microstructures protruding or recessed from the bottom surface. The backlight module of claim 16, wherein an angle between a tangent line of the first concave curved surface adjacent to the bottom surface and a plane of the light exiting surface of the light source is less than or equal to 90 degrees. The backlight module of claim 16, wherein the optical component further comprises a support member, the bottom surface of the support member is coupled to the substrate, wherein the height of the support member is equal to the light exit surface of the light source to The height of the substrate. The backlight module of claim 16, wherein the optical component further comprises a support member having a width between 2% and 20% of the width of the bottom surface. The backlight module of claim 1, wherein an angle between a normal line of the second concave curved surface and an extending plane of the substrate is 90 to 180 degrees. The backlight module of claim 1, wherein the optical component further comprises a convex curved surface surrounding the second concave curved surface, the convex curved surface protruding toward a direction away from the adjacent light source. The backlight module of claim 22, wherein the convex curved surface comprises: a first light-emitting surface adjacent to the second concave curved surface, wherein a normal line of the first light-emitting surface and the substrate extending plane An angle of 0 to 90 degrees; and a second light-emitting surface adjacent to the first light-emitting surface away from the side of the second concave curved surface, wherein an angle between a normal line of the second light-emitting surface and an extending plane of the substrate It is 0 to -90 degrees. The backlight module of claim 22, wherein the second concave curved surface and the convex curved surface are axially symmetric with respect to a line connecting the center of the light source and a substantial center of the optical element. The backlight module of claim 1, wherein the light-emitting surface of the light source is axially symmetric with respect to a center of symmetry of the optical element, and the first concave curved surface is axisymmetric with respect to a center of symmetry of the optical element. The backlight module of claim 1, wherein the light-emitting surface of the light source is non-axisymmetric to the center of symmetry of the optical element, and the first concave curved surface is non-axisymmetric to the symmetry of the optical element. center. The backlight module of claim 1, wherein the cross-section of the first concave curved surface comprises a first width and a second width greater than the first width, wherein a long side of the light-emitting surface of the light source corresponds to The first width, and the short side of the light exit surface of the light source corresponds to the second width. The backlight module of claim 1, wherein the opening of the first concave curved surface facing the light source is between 100% and 150% of the width of the light source. A display device comprising: a backlight module, comprising: a substrate having a first side; at least one light strip having a plurality of light sources, comprising: a first region adjacent to the first side, the first The light source in an area has a first spacing; a second area adjacent to the first area, the light source in the second area has a second spacing, wherein the first spacing is less than the second spacing; and a plurality of An optical component is disposed above each of the light sources, wherein the light incident surface of each of the optical components includes a first concave curved surface that is recessed away from the light source, and the light emitting surface of the optical components includes a second concave curved surface The surface is recessed toward the light source; and a display panel is disposed on the backlight module.