CN217333916U - Backlight module - Google Patents

Abstract

The utility model provides a backlight module, it includes reflector plate, light guide plate, light source and anti-dazzling screen. The light guide plate is arranged on the reflecting sheet. The light source is arranged on one side of the light guide plate. The shading sheet is arranged on the light guide plate. The light shielding sheet has a plurality of light shielding patterns distributed on the light shielding sheet from dense to sparse along a direction from one end of the light shielding sheet adjacent to the light source to the other end of the light shielding sheet far away from the light source.

Description

Backlight module

Technical Field

The present invention relates to a backlight module, and more particularly to a backlight module suitable for a keyboard device.

Background

Most of the existing keyboards with luminous keys have a luminous mechanism that a side light source is used for emitting light and reflecting the light to a light-transmitting character area of the key so that the key has a luminous function. However, the light-emitting manner of disposing the light source at the side portion also causes the brightness of the characters of the keys closer to the side light source on the keyboard to be brighter, and the brightness of the characters of the keys farther away from the side light source to be darker, so that the keys of the whole keyboard have the problem of uneven character brightness.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides an improved backlight module suitable for a keyboard device to solve the problems in the prior art.

According to an aspect of the present invention, a backlight module (backlight module) is provided. The backlight module includes a reflector (reflector), a light guide plate (light guide plate), a light source (light source), and a light shielding plate. The light guide plate is arranged on the reflecting sheet. The light source is arranged on one side of the light guide plate. The shading sheet is arranged on the light guide plate. The light shielding sheet is provided with a plurality of light shielding patterns, and the light shielding patterns are distributed on the light shielding sheet from dense to sparse along the direction from one end of the light shielding sheet adjacent to the light source to the other end of the light shielding sheet far away from the light source.

The above summary is not intended to represent all embodiments or all aspects of the present invention. Rather, the foregoing summary merely provides examples illustrating novel aspects and features of the present invention. In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail. Other aspects of the present invention will become more readily apparent to those of ordinary skill in the art after reviewing the detailed description of the various embodiments with reference to the attached drawings. The following provides a brief description of the drawings.

Drawings

The drawings described below are merely exemplary embodiments and are not intended to limit the scope of the embodiments or the patent claims:

fig. 1 is a schematic view illustrating a backlight module according to an embodiment of the present invention;

fig. 2 is a schematic view illustrating a light shielding pattern of a backlight module and a light shielding sheet included therein according to an embodiment of the invention; and

fig. 3 is a schematic view illustrating a light-falling partition of a light-shielding sheet included in a backlight module according to an embodiment of the present invention.

Description of the reference numerals

100 backlight module

110 reflective sheet

120 light guide plate

130 light source

140 light-shielding sheet

140P light shielding pattern

Z1-Z4 light-reducing region

Detailed Description

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings. Aside from the details given herein, this invention is capable of other embodiments and its several details are capable of modifications in various obvious respects, all without departing from the scope of the invention, all without departing from the invention.

In the description of the specification, numerous specific details are set forth in order to provide a thorough understanding of the present invention; however, the present invention may be practiced without some or all of these specific details. In other instances, well-known and conventional steps or elements have not been described in detail so as not to unnecessarily obscure the present invention. The same or similar elements in the drawings will be denoted by the same or similar symbols. It is specifically noted that the drawings are for illustrative purposes only and do not represent actual dimensions or quantities of elements unless specifically stated otherwise.

Referring to fig. 1, a schematic diagram of a backlight module 100 according to an embodiment of the invention is shown, in which the backlight module 100 includes a reflector plate 110, a light guide plate 120, a light source 130 and a light shielding plate 140. The backlight module 100 is suitable for a keyboard device, for example, to form a light-emitting keyboard. As shown in fig. 1, the light guide plate 120 is disposed on the reflective sheet 110, the light source 130 is disposed at one side of the light guide plate 120, and the light shielding sheet 140 is disposed on the light guide plate 120. The light source 130 is, for example, an LED light source, the light source 130 is used for emitting light toward the light guide plate 120, the light guide plate 120 is used for transmitting the light entering the light guide plate to the whole range of the backlight module 100, and the lower reflective sheet 110 is used for reflecting the light entering the light guide plate 120 upwards, so that the light is emitted toward the upper surface of the backlight module 100.

Fig. 2 is a schematic diagram of the backlight module 100 and the light-shielding pattern 140P of the light-shielding sheet 140 included therein according to an embodiment of the invention, wherein the upper half of fig. 2 shows the light-shielding pattern 140P of the light-shielding sheet 140 in a top view, and the lower half of fig. 2 shows the backlight module 100 in a side view similar to fig. 1. The light shielding sheet 140 is used for shielding the light emitted from the upper surface of the backlight module 100 to control the uniformity of the emitted light from the backlight module 100. In detail, the light shielding sheet 140 has a plurality of light shielding patterns 140P, each of the light shielding patterns 140P is substantially a solid circle, and the solid black dot structure thereof can shield the light emitted toward the upper surface of the backlight module 100 to control the light transmission ratio of the light reflected by the light source 130. For example, the light-shielding patterns 140P are formed on the light-shielding sheet 140 by printing, and the diameter of the solid circle corresponding to the light-shielding patterns 140P is designed to be substantially 0.1 millimeter (mm), for example.

In order to solve the problem that the light-transmitting luminance is higher closer to the light source 130 and the light-transmitting luminance is lower further away from the light source 130, the light-shielding patterns 140P are distributed on the light-shielding sheet 140 from dense to sparse along the direction from the end of the light-shielding sheet 140 adjacent to the light source 130 to the other end of the light-shielding sheet 140 away from the light source 130. That is, the light-shielding patterns 140P of the section portion of the light-shielding sheet 140 closer to the light source 130 are arranged more densely, and the light-shielding patterns 140P of the section portion of the light-shielding sheet 140 farther from the light source 130 are arranged more sparsely, so as to uniformize the brightness of the reflected light of the light source 130.

In detail, a pitch (pitch) between some light-shielding patterns 140P of the light-shielding sheet 140 that are separated from one end of the light-shielding sheet 140 adjacent to the light source 130 by the same specific distance satisfies the following relation: p ═ X-1 × 0.008+0.51, where the pitch corresponds to parameter P and is in millimeters (mm), and the specific distance corresponds to parameter X and is greater than 1 and is in millimeters (mm). Thus, the density of the light-shielding patterns 140P on the light-shielding sheet 140 is a function of the specific distance between the position on the light-shielding sheet 140 and the end adjacent to the light source 130.

For example, assuming that the total length of the light-shielding sheet 140 is 100 millimeters (mm), the pitch between the light-shielding patterns 140P corresponding to the light-shielding sheet 140P is (10-1) × 0.008+0.51 ═ 0.582mm at a position (i.e., a position of a segment that is one tenth of the whole light-shielding sheet) that is 10 millimeters (mm) away from one end of the light-shielding sheet 140 adjacent to the light source 130; the pitch between the light-shielding patterns 140P at the position of the light-shielding sheet 140 that is 50 millimeters (mm) away from the end adjacent to the light source 130 (i.e., the position of the half section of the whole light-shielding sheet), is (50-1) × 0.008+0.51 ═ 0.902mm, that is, the pitch between the light-shielding patterns 140P at the position of the light-shielding sheet 140 that is farther away from the light source 130 is larger, which means that the light-shielding patterns 140P are looser, thereby conforming to the configuration that the light-shielding patterns 140P are densely and sparsely distributed on the light-shielding sheet 140 along the direction from the end of the light-shielding sheet 140 that is adjacent to the light source 130 to the other end of the light-shielding sheet 140 that is farther away from the light source 130.

In addition, for the position of the light shielding sheet 140, which is closer to the light source 130 by less than 1 millimeter (mm), the arrangement of the light shielding patterns 140P at the position may be distributed irregularly, but since the position of the light shielding sheet 140 is closer to the light source 130, it is preferable to adopt a configuration capable of reducing the original brightness of the reflected light of the light source 130 by at least 80%.

Fig. 3 is a schematic view illustrating a light-reducing partition of a light-shielding sheet 140' included in the backlight module 100 according to an embodiment of the present invention. The light-shielding sheet 140 ' is similar to the light-shielding sheet 140, and has a light-shielding pattern 140P ', and also has the configuration or characteristics of the light-shielding sheet 140, which are respectively illustrated in different drawings, in order to clearly show that the light-shielding pattern 140P is a solid circular structure in the light-shielding sheet 140 shown in fig. 2, and to specifically show the configuration of the light-reducing section in the light-shielding sheet 140 ' shown in fig. 3.

In an embodiment, the backlight module 100 may include a light-shielding sheet 140 'as shown in fig. 3, wherein the light-shielding patterns 140P' of the light-shielding sheet 140 'form a plurality of light-reducing regions Z1-Z4 with different light-reducing intensities on the light-shielding sheet 140'. Referring to fig. 2 to 3, the dimming intensities of the dimming areas Z1 to Z4 decrease gradually in sequence from one end of the light-shielding sheet 140 'adjacent to the light source 130 to the other end of the light-shielding sheet 140' away from the light source 130, so as to achieve the effect of uniform brightness of the reflected light of the light source 130. Specifically, the intensity of the light falling in the light falling regions Z1-Z4 is in an equal difference sequence along the direction from the end of the light-shielding sheet 140' adjacent to the light source 130 to the other end of the light-shielding sheet 140 away from the light source 130.

For example, the dimming intensity of the dimming zone Z1 may be set to 80%, i.e., it can decrease the original brightness of the reflected light of the light source 130 by about 80%; the dimming intensity of the dimming zone Z2 can be set to 60%, i.e., it can decrease the original brightness of the reflected light of the light source 130 by about 60%; the dimming intensity of the dimming zone Z3 can be set to 40%, i.e., it can decrease the original brightness of the reflected light of the light source 130 by about 40%; the dimming intensity of the dimming zone Z4 can be set to 20%, that is, the dimming intensity can decrease the original brightness of the light reflected by the light source 130 by about 20%, so that the dimming intensities of the dimming zones Z1-Z4 form an arithmetic progression with a tolerance of 20.

According to the utility model discloses a disclose, the utility model provides a backlight module is applicable in keyboard device, see through its contained anti-dazzling screen have shading pattern and shading pattern along the one end of the adjacent light source of anti-dazzling screen to the direction of the other end of anti-dazzling screen of keeping away from the light source by closely distribute the design on anti-dazzling screen to sparsely, will connect the part of anti-dazzling screen of light source to set up stronger light configuration and will keep away from the part of anti-dazzling screen of light source more and set up weaker light configuration that falls, come the printing opacity proportion of the reflection light of control light source, have the inhomogeneous problem of character luminance with the button of improving whole keyboard device of knowing.

In summary, although the present invention has been described with reference to the above embodiments, the invention is not limited thereto. The present invention is well known in the art and can be modified and decorated without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims (8)

1. A backlight module, comprising:

a reflector plate;

a light guide plate disposed on the reflector plate;

a light source arranged at one side of the light guide plate;

and the shading sheet is arranged on the light guide plate and is provided with a plurality of shading patterns, and the shading patterns are distributed on the shading sheet from dense to sparse along the direction from one end of the shading sheet adjacent to the light source to the other end of the shading sheet far away from the light source.

2. The backlight module of claim 1, wherein each of the light-shielding patterns is substantially a solid circle.

3. The backlight module of claim 2, wherein the solid circle has a diameter of 0.1 millimeter (mm).

4. The backlight module of claim 1, wherein the plurality of light-shielding patterns are formed on the light-shielding sheet by printing.

5. The backlight module of claim 1, wherein the light source is an LED light source.

6. The backlight module of claim 1, wherein the light-shielding pattern forms a plurality of light-reducing regions with different light-reducing intensities on the light-shielding sheet, and the light-reducing intensities of the plurality of light-reducing regions decrease in sequence from the end of the light-shielding sheet adjacent to the light source to the other end of the light-shielding sheet away from the light source.

7. The backlight module of claim 6, wherein the light-reducing intensities of the light-reducing regions are arranged in an arithmetic progression from the end of the light-shielding sheet adjacent to the light source to the other end of the light-shielding sheet away from the light source.

8. The backlight module of claim 1, wherein the backlight module is adapted for a keyboard device.

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