TWI635340B - Back light module capable of distribute uniform light and luminous keyboard - Google Patents

Abstract

The invention provides a backlight module and a light-emitting keyboard with high uniform light-emitting efficiency, including a light guide plate and a plurality of light sources, the light guide plate has a light-emitting surface and a light-incident surface, and the light-emitting surface corresponds to the plurality of key groups of the keyboard and has a plurality of micro-structure areas. To form the light exit, the light source is arranged corresponding to the light incident surface to provide side-entry light, and it further has a shielding member corresponding to the light exiting surface, and the shielding member corresponds to the microstructure area to form a plurality of dimming areas. After the light enters the light guide plate, at least two types of relative light output are formed in each microstructure area, and the areas where the light adjustment area receives each relative light output form a fine adjustment area, and at least one first dimming hole is provided in each fine adjustment area And, the total light output of each fine-tuning area decreases according to the increase of the relative light output, thereby improving the uniformity of light output of each dimming area and improving the phenomenon of poor optical taste.

Description

Backlight module and luminous keyboard with high uniform light emitting efficiency

The invention relates to a light-emitting keyboard, especially a backlight module of the light-emitting keyboard.

The backlight module is currently an optical product commonly used in various electronic devices. It generally includes a light guide plate and a light source, and is divided into two types of direct-lit and side-lit backlight modules depending on the position of the light source relative to the light guide plate. Early backlight modules used cold cathode tubes as the light source to provide light to the light guide plate, but in view of the vigorous development of light-emitting diode (hereinafter referred to as LED) technology in recent years, they have gradually replaced cold cathode tubes and are used in backlight modules. The advantages of high color rendering and low power consumption of LED improve the use efficiency of the backlight module.

In addition to the backlight module, it can be used in displays. Due to the popularization of information devices such as personal computers or notebook computers, the use of input devices such as keyboards and mice has also increased the functional requirements, especially Modern people have been using computers for longer and longer, regardless of time and location. In order to allow users to use in a dimmer environment, some companies have applied backlight modules to keyboards to take advantage of the backlight module ’s The light illuminates the keyboard keys.

As mentioned above, the backlight module currently uses LEDs as the light source, but due to the high directivity of the LED light and the limited angle of light, the light projected onto the light guide plate often produces uneven light and dark light, especially in the vicinity of the light incident area Even more serious. When the light is not uniform, it will cause uneven illumination of the keys, which will affect the user's viewing situation.

In view of this, the present inventors have proposed a backlight module and a light-emitting keyboard with high uniform light emitting performance in order to improve the light emitting uniformity of the backlight module so that the mounted keyboard and other electronic devices have better optical taste.

An object of the present invention is to provide a backlight module and a light-emitting keyboard with high uniform light-emitting efficiency, which can effectively improve the overall light-emitting uniformity, provide users with better light-emitting presentation, and enhance optical taste.

In order to achieve the above object, the present invention provides in one embodiment a backlight module with high uniform light output performance, having a light guide plate and a plurality of light sources, the light guide plate having a light exit surface and a light entrance surface, the light exit surface having a plurality of micro The structure area is used to form light exits. The light sources are arranged corresponding to the light incident surface to provide side-entry light. The backlight module with high uniform light emitting performance further has a shielding member corresponding to the light emitting surface. A plurality of dimming areas are formed corresponding to each microstructure area of the shielding member; wherein, when light enters the light guide plate, at least two relative light output amounts are formed in each microstructure area. The dimming area forms a fine-tuning area corresponding to each area receiving the relative light output, each of the fine-tuning areas is provided with at least one first dimming hole, and the total light output of each fine-tuning area is increased according to the relative light output The reduction is used to improve the uniformity of the light output of each dimming area, so that after the light is emitted from the shielding member, light with uniform brightness can be formed to solve the problem of poor optical taste.

In one embodiment, it is disclosed that each of the first dimming holes is a circular perforation, which is set according to the relative light output received by each trimming area, and can also be provided in plural.

Based on the foregoing embodiments, in one embodiment, at least one of the backlight modules is disclosed. The fine adjustment area may further have at least one second dimming hole, the second dimming hole is adjacent to any one of the first dimming holes, and is also a circular perforation. Therefore, the second dimming hole can be used to improve the dimming precision of each fine-tuning area. For example, the diameters of the first dimming hole and the second dimming hole can be different.

In addition, in another embodiment, each of the first dimming holes may be in the form of a polygonal perforation, so as to correspond to the area shape of each fine-tuning area.

Furthermore, in the next embodiment, it is disclosed that at least one of the first dimming holes is a circular perforation and at least one of the first dimming holes is a polygonal perforation. , So that each fine-tuning area can more accurately adjust the total light output to improve the overall light uniformity.

In another embodiment, the present invention also discloses a light-emitting keyboard with high uniform light output performance, having a plurality of key sets, a light guide plate and a plurality of light sources, the key sets are provided on one side of the light guide plate, the light guide plate has a A light exit surface and a light entrance surface, the light exit surface corresponding to the key set has a plurality of micro-structured areas for forming light exit, the light sources are provided corresponding to the light entrance surface to provide side-entry light, characterized by: The light-emitting keyboard with light-emitting performance further has a shielding member, which is a sheet-like structure and is disposed between the key groups and the light guide plate corresponding to the light-emitting surface. The shielding member is formed corresponding to each micro-structured area A plurality of dimming areas; wherein, after the light enters the light guide plate, at least two relative light output amounts are formed in each of the microstructure areas, and the dimming area respectively forms a fine adjustment area corresponding to the area receiving the relative light output amounts, each of which At least one first dimming hole is provided in the trimming area, and the total light output of each trimming area is decreased according to the increase of the relative light output, thereby improving the light uniformity of each dimming area when the light is blocked After the components adjust their light output through the first dimming holes, a uniform light uniformity is formed when they are transferred to the key set, so as to effectively improve the light output of the light-emitting keyboard and improve the presentation of optical taste.

Based on the foregoing embodiment, in one embodiment, each of the first dimming holes is a circular perforation, so as to adjust the total light output of each trimming area according to the relative light output received.

Or in another embodiment, it is disclosed that at least one of the trimming regions further has at least one second dimming hole, the second dimming hole is adjacent to any one of the first dimming holes, and is also a circle Perforation, through the second dimming hole to more finely adjust the total light output of each fine adjustment area, so that each dimming area can have a uniform light uniformity, for example, the diameter of the second dimming hole and the first dimming hole Implemented in a different way.

In addition, in one embodiment, each of the first dimming holes is a polygonal perforation, which is arranged according to the shape and state of each fine-tuning area, which simplifies the design difficulty.

Or in another embodiment, at least one of the first dimming holes is a circular perforation, and at least one of the first dimming holes is a polygonal perforation, so as to match each other through the circular and polygonal first dimming holes, and Improve the performance of each fine-tuning area to adjust the light output, thereby improving the overall light uniformity.

In summary, the backlight module and the light-emitting keyboard with high uniform light output disclosed by the present invention achieve the effect of secondary dimming by providing the first dimming hole in the shield to further adjust the overall uniform light output Degree, enhance optical taste. Since the light emitted from the light guide plate microstructure area, the relative light output will be different, so the light intensity cannot be maintained at an average value, and the light can be uniform after passing through the shielding member through the first dimming hole Light evenly. In accordance with the intensity of the relative light output, the first dimming hole can be set as described above to effectively adjust the light uniformity and improve the presentation of optical taste.

1‧‧‧Backlight module

10‧‧‧Light guide plate

101‧‧‧Glossy

1011‧‧‧Microstructure area

102‧‧‧entrance

11‧‧‧Light source

12‧‧‧Shield

121‧‧‧Dimming area

1211‧‧‧fine adjustment area

1211a‧‧‧fine adjustment area

1211b‧‧‧fine adjustment area

1212‧‧‧First dimming hole

1213‧‧‧Second dimming hole

2‧‧‧ illuminated keyboard

20‧‧‧Key group

Figure 1 is an exploded schematic view of the first embodiment of the present invention.

Fig. 2 is a schematic plan view of the first embodiment of the present invention.

FIG. 3 is a schematic plan view of another embodiment of the first embodiment of the present invention.

Fig. 4 is a schematic plan view of the second embodiment of the first embodiment of the present invention.

Fig. 5 is an exploded schematic view of the second embodiment of the present invention.

Since the results of adjusting the overall light uniformity only by the light guide plate are not good at present, in order to provide optical elements with higher optical taste, the inventors made many attempts and ideas and then proposed the technical content as described below. Please refer to FIGS. 1 and 2, which are an exploded schematic view and a plan schematic view of the first embodiment of the present invention. The invention discloses a backlight module 1 with high uniform light output efficiency, which has a light guide plate 10 and a plurality of light sources 11, the light guide plate 10 has a light output surface 101 and a light incident surface 102, and the light output surface 101 has a plurality of microstructure regions 1011 In order to form a light exit, each light source 11 is disposed corresponding to the light incident surface 102 to provide side-entry light. The aforementioned backlight module 1 can be applied to a keyboard to provide light illumination, so that each micro-structured area 1011 can be arranged corresponding to a keyboard key, and in each micro-structured area 1011, it can be arranged in a concave or convex shape. The dot structure (not shown) is used to guide light to form light. Each light source 11 may be an LED, which is arranged on a circuit board to form a light bar, but the invention is not limited thereto.

The aforementioned backlight module 1 is characterized in that it further has a shielding member 12 which is disposed corresponding to the light-emitting surface 101 and is a sheet-like structure body, and the shielding member 12 forms a plurality of dimming regions 121 corresponding to the microstructure regions 1011. After the light enters the light guide plate 10, at least two types of relative light output will be formed in each microstructure area 1011. The dimming area 121 corresponds to the area that receives each relative light output, and a fine adjustment area 1211 is formed respectively. Each fine adjustment area 1211 is provided with There is at least one first dimming hole 1212, and The total light output of each trimming area 1211 decreases according to the increase of the relative light output, thereby improving the light uniformity of each light adjusting area 1211. More specifically, the shielding member 12 is a sheet with a light-blocking effect, which can be made of an opaque material such as black plastic, etc. Except for the first dimming hole 1212 to allow light to be conducted outward, the rest are all Block light due to opaque materials. After the light enters the light guide plate 10, the micro-structure area 1011 will show at least two types of relative light output light, wherein the relative light output refers to a single micro-structure area 1011, the light output in different areas are compared with each other The result of the relatively high or low light output brightness, that is, the different relative light output, that is, has different light output brightness. When the light with the relative light output irradiates the dimming area 121 corresponding to the shielding member 12 through the first dimming hole 1212, the high-brightness light passing through the shielding member 12 can be compared with the first dimming hole 1212 The light output is greatly reduced, and the low-brightness light passing through the shielding member 12 can be adjusted through the first dimming hole 1212 to a smaller extent, so that the light intensity emitted from each fine adjustment area 1211 is equal, and The light uniformity of each dimming area 121 is improved. In addition to improving the uniformity of light output of each dimming area 121, the intensity of light emitted from the shielding member 12 can be further uniformed through each first dimming hole 1212. The microstructure area 1011, the dimming area 121 and the first dimming hole 1212 shown in the figures are only for illustrative purposes, and are not actual layout patterns, and each microstructure area 1011 and dimming area The frame line of 121 is for illustrative purposes only, not the actual structural line. When applied to a keyboard, the microstructure area 1011 and the dimming area 121 will be arranged according to the position of the keys (refer to FIG. 5), which will be described first here.

In practical applications, although the light intensity can be adjusted and distributed through the microstructure area 1011 of the light guide plate 10, the light cannot effectively reach an average value, and in order to improve the uniformity of the light, the dot distribution in the microstructure area 1011 The design is quite difficult, and in addition to the design is not easy, there are more requirements to be considered in production, and it is relatively difficult, so the light self-guided light microstructure 10 When the area 1011 emits light, there will still be unevenness, especially in the area adjacent to the light incident surface 102 is more likely to form uneven light and dark. Therefore, in addition to adjusting the microstructure area 1011 of the light guide plate 10 according to the unevenness caused by the light source 11, the corresponding dimming areas 121 must also be designed accordingly. The dimming areas 121 adjacent to the light source 11 are schematically illustrated below. In detail, since each light source 11 has a spread range relative to the light guide plate 10, and as described above, when the light source 11 is arranged at intervals, any two adjacent The light spreading ranges of the light sources 11 will overlap each other, and the light guide plate 10 will form relatively strong light output in the overlapping area, and conversely, it will form relatively weak light output outside the overlapping area. As described above, after adjustment through the microstructure area 1011 of the light guide plate 10, although the light uniformity can be slightly averaged, the optical taste is still insufficient. Therefore, when light is emitted from each microstructure area 1011 and transmitted to the dimming area 121 of the shielding member 12, light with different relative light output amounts will be formed. Therefore, in this embodiment, the first dimming hole 1212 in each dimming area 1211 in the dimming area 121 is used to control the light, so as to effectively respond to the relative amount of light received, so that each dimming area 121 has equal For the brightness and uniformity of light output, the brightness of light passing through the shielding member 12 can reach an average value, so as to improve the uniformity of light output of the backlight module 1.

In this embodiment, each of the first dimming holes 1212 may be a circular perforation. As shown in FIG. 2, each of the dimming areas 1211 formed in the dimming area 121 corresponding to the relative light output amounts, corresponding to the relative The amount of light determines the appearance of the first dimming hole 1212 arranged in the area. When the first dimming hole 1212 is a circular perforation, the allowable light output of each trimming area 1211 can be further planned by adjusting the area of the first dimming hole 1212 or the number of layouts. For example, in the dimming area 121, the relative light output received by any fine-tuning area 1211a is relatively low, then the allowable light output is relatively high; the relative light output received by any fine-adjusting area 1211b is relatively high, then the allowable light output is allowed. It is relatively low, so that each dimming area 121 can have an average brightness. In addition, to make each fine-tuning area 1211 The amount of light output can be further fine-tuned, and at least one fine-tuning area 1211 can have at least one second dimming hole 1213, and the second dimming hole 1213 is adjacent to any first dimming hole 1212. It is also a circular perforation. The diameters of the second dimming hole 1213 and the first dimming hole 1212 can be different sizes, so that the light output of some areas in each fine-tuning area 1211 can be slightly adjusted through the second dimming hole 1213.

Please refer to FIG. 3, which is a schematic plan view of another embodiment of the first embodiment of the present invention. In this embodiment, it is disclosed that each of the first dimming holes 1212 is a polygonal perforation. As shown in the figure, based on the relative light output received by each fine-tuning area 1211, the first light-adjusting hole 1212 may be in the form of a triangle, a trapezoid, or even a step, to adjust the allowable light output in each area, so that each The dimming areas 1211 can all have the same light intensity, and then the light output from the shielding member 12 can be uniformized. For example, the fine-tuning area 1211a located in the overlapping area of the non-light source 11 in the overlapping range of the light source can make the first dimming hole 1212 provided in the area step-shaped in consideration of light receiving conditions. Or, when the fine-tuning area 1211b is trapezoidal, the first dimming hole 1212 provided in the area can be trapezoidal. Wherein, the first dimming hole 1212 is polygonal, which can also be more in line with the shape of each fine-tuning area 1211. And if the relative light output received by the fine-tuning area 1211 is low, the area of the first dimming hole 1212 can be made larger, otherwise, the relative light output received by the fine-tuning area 1212 can be made large, the area of the first dimming hole 1212 can be made small .

Please refer to FIG. 4 again, which is a schematic plan view of the second embodiment of the first embodiment of the present invention. In this embodiment, at least one first dimming hole 1212 is a circular perforation, and at least one first dimming hole 1212 is a polygonal perforation. As shown in the figure, in addition to making each of the first dimming holes 1212 circular or polygonal, the dimming area 1211 can also have circular perforations and polygonal perforations as in the present embodiment. Set to adjust according to the relative light output received by each trimming area 1211. For example, in a region where the non-light source 11 overlaps In the fine-tuning area 1211a, since the relative light output received by it is relatively low, a polygonal perforation with a larger area can be provided here, whereas in the fine-tuning area 1211b which receives a relatively high light output, it can be used as the first A dimming hole 1212 is used for adjustment, which is more conducive to production and improves the precision of light adjustment of each fine adjustment area 1211.

Please refer to Figure 5 for an exploded schematic view of the second embodiment of the present invention, and please refer to Figures 1 to 4 for the combination. In the present embodiment, the present invention discloses a light-emitting keyboard 2 with high uniform light emitting performance, which has a plurality of key sets 20, a light guide plate 10 and a plurality of light sources 11, the key set 20 is provided on the side of the light guide plate 10 It also has a light exit surface 101 and a light entrance surface 102. The light exit surface 101 has a plurality of microstructure regions 1011 corresponding to the key set 20 for forming light exits, and each light source 11 is provided corresponding to the light entrance surface 102 to provide side entry light.

The aforementioned light-emitting keyboard 2 is characterized in that it further has a shielding member 12 which is a sheet-like structure and is arranged corresponding to the light emitting surface 101, and is located between the key set 20 and the light guide plate 10, and the shielding member 12 corresponds to Each microstructure area 1011 is formed with a plurality of dimming areas 121. After the light enters the light guide plate 10, at least two types of relative light output are formed in each microstructure area 1011. The light adjustment area 121 forms a fine adjustment area 1211 corresponding to the area receiving the relative light output respectively. Each fine adjustment area 1211 is provided with At least one first dimming hole 1212, and the total light output of each fine-tuning area 1211 decreases according to the increase of the relative light output, thereby improving the uniformity of light output of each dimming area 121. In detail, the light output from each dimming area 121 of the shielding member 12 will be projected to each button group 20 to light up each button group 20 to achieve a luminous effect. In order to avoid uneven light projected on the key set 20, according to the relative light output from the microstructure area 1011 of the light guide plate 10, the shielding member 12 passes through the first dimming hole 1212 of each fine adjustment area 1211 to effectively uniform The uniformity of the light emitted by the shielding member 12 to the key set 20 makes the light-emitting keyboard 2 have better lighting effect and optical taste. Each microstructure area 1011 is adjusted with The frame line of the light area 121 is for illustrative purposes only, not a structural line that actually exists. In addition, the aforementioned light-emitting keyboard 2 may further include electronic signal elements such as a membrane switch, but it is already a conventional technology and will not be repeated here.

Similarly, as described in the first embodiment, the first dimming holes 1212 may be circular perforations, and at least one fine-tuning area 1211 may further have at least one second dimming hole 1213, the second dimming hole 1213 is adjacent to any first dimming hole 1212, and is also a circular perforation, thereby designing the first dimming in each trimming area 1211 according to the relative light output received by each trimming area 1211 The light holes 1212 and the second dimming holes 1213 are arranged. For this, please refer to FIG. 2 again. For other relevant technical details, please refer to the content of the first embodiment.

In addition, the first dimming holes 1212 can be circular perforations, and each of the first dimming holes 1212 can also be polygonal perforations, so as to further correspond to the shape of the fine-tuning regions 1211 to form, so that the fine-tuning regions 1211 Even through a single first dimming hole 1212, the light output in this area can be effectively adjusted, so that the light provided by the shielding member 12 to each button group 20 can be equal to the average value. Please repeat the layout of the first dimming hole 1212. Refer to FIG. 3 for the rest of the relevant technical details, please refer to the content of the first embodiment for the matching.

Further, the first dimming holes 1212 can be circular perforations, and at least one of the first dimming holes 1212 can be polygonal perforations, so that each dimming area 121 has a state in which circular perforations and polygonal perforations are arranged in order to adjust to the relative light output received by each fine-tuning area 1211. For its layout, please refer to Figure 4 again. For other related technical details, please refer to The content of the first embodiment.

In summary, the backlight module and the light-emitting keyboard with high uniform light output disclosed by the present invention can further adjust the overall light uniformity by providing the first dimming hole in the shield. Due to the light emitted from the microstructure area of the light guide plate, the relative light output of each area is different, so the light intensity cannot be maintained at an average value, and through the corresponding design of the first dimming hole, the light can be shielded After the piece, the light is evenly distributed to achieve the effect of secondary dimming. According to the intensity of each relative light output, the first dimming hole can be set as various types as described above to effectively adjust the light uniformity and improve the presentation of optical taste.

However, the above are only preferred embodiments of the present invention and are not intended to limit the scope of the present invention; therefore, all changes and modifications made without departing from the spirit and scope of the present invention should be covered in Within the patent scope of the invention.

Claims (10)

A backlight module with high uniform light-emitting efficiency has a light guide plate and a plurality of light sources, the light guide plate has a light-emitting surface and a light-incident surface, the light-emitting surface has a plurality of micro-structure areas for forming light, and the light sources correspond to The light-incident surface is provided to provide side-entry light. The backlight module with high uniform light-emitting efficiency is further provided with a shielding member, which is corresponding to the light-emitting surface and is a one-piece structure. The shielding member A plurality of dimming areas are formed corresponding to each of the microstructure areas; wherein, after light enters the light guide plate, at least two relative light output amounts are formed in each of the microstructure areas, and the dimming area corresponds to an area that receives each of the relative light output amounts A fine-tuning area is formed respectively, and each of the fine-tuning areas is provided with at least one first dimming hole, and the total light output of each fine-tuning area is decreased according to the increase of the relative light output, thereby enhancing the light-adjusting area of each Light uniformity, wherein at least one of the fine adjustment areas further has at least one second dimming hole, and the second dimming hole is adjacent to any one of the first dimming holes. As described in item 1 of the patent application scope, a backlight module with high uniform light output efficiency, wherein each of the first dimming holes is a circular perforation. The backlight module with high uniform light emitting performance as described in item 2 of the patent application scope, wherein the second dimming hole is a circular perforation. As described in item 1 of the patent application range, a backlight module with high uniform light output efficiency, wherein each of the first dimming holes is a polygonal perforation. The backlight module with high uniform light emitting performance as described in item 1 of the patent application scope, wherein at least one of the first dimming holes is a circular perforation, and at least one of the first dimming holes is a polygonal perforation. A light-emitting keyboard with high uniform light-emitting efficiency, having a plurality of key groups, a light guide plate and a plurality of light sources, the key groups are arranged on one side of the light guide plate, the light guide plate has a light exit surface and a light entrance surface, the light exit surface Corresponding to the button sets, there are a plurality of micro-structured areas for forming light. The light sources are arranged corresponding to the light-incident surface to provide side-entry light. The characteristic is that the light-emitting keyboard with high uniform light-emitting efficiency further has a shielding member. The shielding member is a sheet-like structure body and is disposed between the key groups and the light guide plate corresponding to the light emitting surface. The shielding member forms a plurality of dimming regions corresponding to the microstructure regions; wherein, light enters the guide After the light board, at least two kinds of relative light output are formed in each of the micro-structured areas, and the dimming area forms a fine-tuning area corresponding to the area receiving the relative light output respectively, and each of the fine-tuning areas is provided with at least one first tone Light holes, and the total light output of each of the fine-tuning areas decreases according to the increase of the relative light output, thereby improving the light uniformity of each of the dimming areas, wherein at least one of the fine-tuning areas further has at least one second tone The light hole, the second dimming hole is adjacent to any one of the first dimming holes. As described in Item 6 of the patent application range, a luminous keyboard with high uniform light emitting performance, wherein each of the first dimming holes is a circular perforation. The light-emitting keyboard with high uniform light-emitting efficiency as described in item 7 of the patent application scope, wherein the second dimming hole is a circular perforation. As described in Item 6 of the patent application range, a luminous keyboard with high uniform light emitting performance, wherein each of the first dimming holes is a polygonal perforation. As described in Item 6 of the patent application range, a light-emitting keyboard with high uniform light emitting performance, wherein at least one of the first dimming holes is a circular perforation, and at least one of the first dimming holes is a polygonal perforation.