DISPLAY DEVICE
A display device is disclosed, which includes: a display panel; and a backlight module corresponding to the display panel. The backlight module includes: a light source; and a light guide plate adjacent to the light source and having a surface and a light guide dot. The light guide dot comprises a first valley and a second valley, the first valley has a first valley point, and the second valley has a second valley point. On the basis of the surface of the light guide plate as a reference surface, the first valley is recessed into the reference surface, the second valley is recessed into the reference surface, a distance from the first valley point to the reference surface is defined as a first depth, a distance from the second valley point to the reference surface is defined as a second depth, and the first depth is different from the second depth.
This application claims the benefits of the Taiwan Patent Application Serial Number 103112278, filed on Apr. 2, 2014, the subject matter of which is incorporated herein by reference.
This application is a continuation (CA) of U.S. Patent application for “DISPLAY DEVICE”, U.S. application Ser. No. 14/621,319 filed Feb. 12, 2015, and the subject matter of which is incorporated herein by reference.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to a display device and, more particularly, to a display device equipped with a light guide plate with a specific structure.
2. Description of Related Art
As the electronic products progressed, the demands for the same are also increased. For display devices, display quality thereof is one item that consumers request. Backlight modules are one essential unit in the display devices, and the efficiency thereof is also one factor related to the display quality of the display device. In general, the backlight module is assembled with a rear frame, a light guide plate, a light source and plural optical films, and provides light into the display panel.
The general used light source is a linear light source or a point light source. If it is desired to evenly illuminate light into the display panel, except for disposing the optical films properly, the light guide plate is used to firstly scatter the light from the light source. In the general backlight module, the light from the light source is firstly emitted into the light guide plate, followed by scattering with the light guide plate, passing through plural optical films and illuminating into the display panel. In order to obtain the best scattering effect of the light guide plate, a micro-pattern is formed on a reflection plane (i.e. a side opposite to the light emitting surface of the light guide plate with the display panel disposed thereon) of the light guide plate.
Herein, the micro-pattern on the light guide plate is one main factor related to the light scattering effect thereof Therefore, it is desirable to provide a light guide plate with specific structure to improve the light emitting amount thereof.
SUMMARY OF THE INVENTIONAn object of the present invention is to provide a display device, wherein the backlight module used therein comprises a light guide plate with a specific structure to increase light emitting amount of the backlight module.
Another object of the present invention is to provide a method for manufacturing a light guide plate for a backlight module of a display device, which can be used to produce a light guide plate capable of increasing light emitting amount of the backlight module in a simple and rapid way.
To achieve the object, the method for manufacturing the light guide plate for the backlight module of the display device comprises the following steps: providing a mold disposed with at least one protrusion and at least one recess on a surface thereof, wherein each recess corresponds to and is surrounded with the protrusion; providing a material for forming a light guide plate on the mold; and curing the material for forming the light guide plate and removing the mold to obtain the light guide plate.
After the aforementioned steps, a light guide plate with a specific structure in one aspect of the present invention is obtained, in which at least one light guide dot with an embossment and a cavity is disposed on a surface of the light guide plate, and the cavity surrounds the embossment.
When the surface of the light guide plate is considered as a reference surface, the embossment is protruded from the reference surface, the cavity is recessed into the reference surface, the embossment has a (maximum) first width (w1) based on the reference surface, the cavity has a (maximum) second width (w2) based on the reference surface, and the (maximum) first width (w1) is larger than the (maximum) second width (w2) (w1>w2). Preferably, a ratio of the (maximum) second width to the (maximum) first width is larger than or equal to 0.05 as well as less than or equal to 0.6 (0.05≦w2/w1≦0.6). In addition, a ratio of a height (H) of the embossment to a depth (D) of the cavity is in a range from 1 to 2 (1≦H/D≦2).
When the light guide plate with the aforementioned specific structure is applied on a backlight module, the obtained backlight module can be assembled with a display panel to obtain a display device of the present invention. Hence, the display device of the present invention comprises: a display panel; and a backlight module corresponding to the display panel, wherein the backlight module comprises: a light source; and the aforementioned light guide plate adjacent to the light source.
In the present invention, the light guide plate may comprise a first region and a second region, wherein the first region locates between the second region and the light source, at least two light guide dots are selectively disposed on the surface of the light guide plate in the second region thereof, and the light guide dots are adjacently disposed. Preferably, the cavities of two adjacent light guide dots are integrated into a concave. Especially, when the surface of the light guide plate is considered as a reference surface, the cavities are recessed into the reference surface, and the concave located between the embossments has a maximum depth.
Except for the aforementioned light guide plate, another light guide plate with a specific structure can also be obtained in another aspect of the present invention after the aforementioned steps for manufacturing the same, which can also be applied to a backlight module and assembled with a display panel to obtain a display device of the present invention. Hence, the display device of another aspect of the present invention comprises: a display panel; and a backlight module corresponding to the display panel, wherein the backlight module comprises: a light source; and a light guide plate of this aspect adjacent to the light source and having a surface. The light guide plate of this aspect comprises: a first region and a second region, and the first region locates between the second region and the light source, wherein at least one light guide dot with two first embossments and a cavity is disposed on the surface of the light guide plate in the second region thereof, and the first embossments are disposed in the cavity.
When the surface of the light guide plate is considered as a reference surface, the first embossments are respectively protruded from the reference surface, and the cavity is recessed into the reference surface. In addition, the cavity has a minimum second width (w2) and a maximum third width (w3), and a ratio of the minimum second width (w2) to the maximum third width (w3) is in a range from 0.05 to 0.2 (0.05≦w2/w3≦0.2). In addition, the light guide dot may further selectively comprise a second embossment disposed in the cavity. Furthermore, the cavity preferably has a maximum depth between two adjacent first embossments.
Except for the aforementioned light guide plate, another light guide plate with a specific structure can also be obtained in further another aspect of the present invention after the aforementioned steps for manufacturing the same, which can also be applied to a backlight module and assembled with a display panel to obtain a display device of the present invention. Hence, the display device of further another aspect of the present invention comprises: a display panel; and a backlight module corresponding to the display panel, wherein the backlight module comprises: a light source; and a light guide plate of this aspect adjacent to the light source and having a surface. The light guide plate of this aspect comprises: a first region and a second region, and the first region locates between the second region and the light source, wherein at least one light guide dot has two embossments, two cavities and a concave, two embossments are adjacently disposed, each cavity respectively corresponds to and surrounds the embossment, and the concave is disposed between two adjacent embossments.
When the surface of the light guide plate is considered as a reference surface, the embossments are respectively protruded from the reference surface, and the cavities and the concave are respectively recessed into the reference surface. Preferably, a depth of the concave is larger than that of the cavity.
In the light guide plate and the display device comprising the same of the aforementioned aspect of the present invention, the cavity and/or the concave is recessed into the surface of the light guide plate (i.e. the reference surface), and the cavity and/or the concave may have different depth.
Furthermore, in the light guide plate and the display device comprising the same of the aforementioned aspect of the present invention, the embossment, the first embossment, the second embossment, the cavity and/or the concave may respectively have a rough surface.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
The present invention has been described in an illustrative manner, and it is to be understood that the terminology used is intended to be in the nature of description rather than of limitation. Many modifications and variations of the present invention are possible in light of the above teachings. Therefore, it is to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.
Hereinafter, the structures of the light guide plate (LGP), the backlight module and the display device and the methods for manufacturing the same of the present invention are illustrated in detail.
As shown in
Next, as shown in
For the conventional method for manufacturing the LGP, a laser patterning process is directly performed on the plate for forming the LGP, but this process is expensive and time consuming However, the LGP of the present embodiment is produced with a molding process. Hence, in the process for manufacturing the LGP of the present embodiment, the process for pattering the mold is only performed for one time, and then plural LGPs can be sequentially obtained through the molding process with the mold. Therefore, the LGP of the present embodiment can be produced in a rapid, simple and low cost way.
Herein, light in all directions was illuminated into a LGP having the structure of
After the LGP of the present embodiment is obtained through the aforementioned process, the obtained LGP is assembled with other units for a backlight module to obtain the backlight module of the present embodiment.
Finally as shown in
Hereinafter, the structure of the LGP of the present embodiment is illustrated in detail.
As shown in the region A in the first region R1 of
As shown in the region B in the first region R1 of
As shown in
In addition, as shown in
In addition, only the region R2 of the LGP 2 with two adjacent light guide dots 21a, 21b formed thereon are illustrated (as shown in
When the light illuminated into the LGP, the embossment and the cavity formed thereon can break the total reflection of the illuminated light to guide the light outside the LGP. In addition, the rough surfaces of the embossment and the cavity on the LGP can scatter the illuminated light to make the guided light evenly illuminate into the display panel.
When the material with low viscosity is used to form the LGP through an injection molding process, the LGP having the structures of
In addition, as shown in
Herein, the light emitting efficiency of the LGP of the present invention is measured.
In the present test, light in all directions was illuminated into LGPs respectively having the structures shown in regions B, B′, C and C′ of
As shown in
In addition, the relation between intensity and angles of emitting light by using the LGP having the structure of
Furthermore, the display device provided by the present invention can be applied to any electronic device for displaying images, such as a mobile phone, a notebook, a camera, a video camera, a music player, a navigation system, or a television.
Although the present invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the spirit and scope of the invention as hereinafter claimed.
Claims
1. A display device, comprising:
- a display panel; and
- a backlight module corresponding to the display panel and comprising: a light source; and a light guide plate adjacent to the light source and having a surface, wherein the light guide plate has a light guide dot,
- wherein, in a cross-section view of the light guide dot, the light guide dot comprises a first peak, a second peak, a first valley, a second valley and a third valley, the first peak and the second peak are located between the first valley and the second valley, the third valley is located between the first peak and the second peak, the first peak has a first peak point, the second peak has a second peak point, the first valley has a first valley point, the second valley has a second valley point, and the third valley has a third valley point,
- wherein on the basis of the surface of the light guide plate as a reference surface, the first valley is recessed into the reference surface, the second valley is recessed into the reference surface, a distance from the first valley point to the reference surface is defined as a first depth, a distance from the second valley point to the reference surface is defined as a second depth, and the first depth is different from the second depth.
2. The display device as claimed in claim 1, wherein a distance from the first peak point to the reference surface is defined as a first distance, a distance from the second peak point to the reference surface is defined as a second distance, and the first distance is different from the second distance.
3. The display device as claimed in claim 2, wherein the first depth is different from one of the first distance and the second distance.
4. The display device as claimed in claim 3, wherein the first depth is different from the first distance and the second distance.
5. The display device as claimed in claim 2, wherein the second depth is different from one of the first distance and the second distance.
6. The display device as claimed in claim 5, wherein the second depth is different from the first distance and the second distance.
7. The display device as claimed in claim 1, wherein the light guide dot further comprises a third peak, and the second valley is located between the third peak and the second peak.
8. The display device as claimed in claim 7, wherein the third peak has a third peak point, a distance from the first peak point to the reference surface is defined as a first distance, a distance from the second peak point to the reference surface is defined as a second distance, a distance from the third peak point to the reference surface is defined as a third distance, and the third distance is different from one of the first distance and the second distance.
9. The display device as claimed in claim 8, wherein the third distance is different from the first distance and the second distance.
10. The display device as claimed in claim 1, wherein the first valley and the second valley have different widths based on the reference surface.
11. The display device as claimed in claim 1, wherein the first peak and the second peak have different widths based on the reference surface.
12. The display device as claimed in claim 1, wherein a portion of at least one of the first peak and the second peak comprises a rough surface.
13. The display device as claimed in claim 1, wherein a portion of at least one of the first peak and the second peak comprises a curved surface.
14. The display device as claimed in claim 1, wherein a portion of at least one of the first valley, the second valley and the third valley comprises a rough surface.
15. The display device as claimed in claim 1, wherein a portion of at least one of the first valley, the second valley and the third valley comprises a curved surface.
Type: Application
Filed: Apr 5, 2017
Publication Date: Jul 20, 2017
Inventors: Yen-Liang CHEN (Jhu-Nan), Meng-Ko TSAI (Jhu-Nan), Kuei-Ling LIU (Jhu-Nan)
Application Number: 15/480,305