TWM603188U - Illuminated keyboard and backlight module thereof - Google Patents

Abstract

An illuminated keyboard, comprising: a first keycap group and a second keycap group, and a backlight module is disclosed. The first keycap group and the second keycap group respectively have a plurality of keycaps. The backlight module has a first light-emitting unit, a second light-emitting unit, a first resistor, a second resistor, a light guide plate, and a circuit board. The light-emitting elements in the first light-emitting unit and the second light-emitting unit are respectively electrically connected to each other in parallel. The first resistor is electrically connected with the first light-emitting unit in series, and the second resistor is electrically connected with the second light-emitting unit in series. The light guide plate is provided with a plurality of through holes, and the circuit board is disposed under the light guide plate. The first light-emitting unit, the second light-emitting unit, the first resistor and the second resistor are disposed on the circuit board. The sum of a first light-emitting area of the keycaps of the first keycap group is not equal to the sum of a second light-emitting area of the keycaps of the second keycap group.

Description

Luminous keyboard and its backlight module

The invention relates to a keyboard, in particular to a luminous keyboard and its backlight module.

The backlight module of the currently popular luminous keyboard mainly includes four major components, which are composed of a light shield, a light guide plate (Light Guide Plate, LGP), a reflector, and a light bar from the keyboard downward. This type of backlight module will place all the light-emitting elements on the same light bar, and the light bar will be placed near the center of the backlight module, so that the light emitted by the light-emitting elements on the light bar will enter the light guide plate on both sides , And then through the light guide plate to distribute the light on the back of the keyboard to form the keyboard backlight.

However, this type of light-emitting keyboard has the problems of thicker thickness and uneven light. At present, another light-emitting module structure of the light-emitting keyboard is proposed, which installs the light-emitting elements on the circuit board and stacks the key caps sequentially from top to bottom. , Scissor feet, iron plate, black matrix (Black Matrix, BM), light guide plate, reflector, circuit board multilayer structure. However, since the light-emitting diode (LED) height of the current light-emitting element is the thinnest 0.15mm, in order to reduce the overall thickness and improve the brightness and uniformity of light emission, it is necessary to consider further improvement of its design method.

In addition, the current light-emitting keyboard is matched with resistors to control the light-emitting brightness of the overall backlight module; if there are N light-emitting elements, N resistors are matched to control the brightness of each light-emitting element separately to control the overall brightness. However, when the number of light-emitting elements is large, the cost of the elements will increase, and the product does not have a cost advantage.

Therefore, it is necessary to propose a new luminous keyboard design, which can reduce the overall thickness, effectively simplify components to reduce power consumption and component cost, improve keyboard luminous brightness and evenly distribute light sources.

In view of this, the present invention proposes a luminous keyboard and backlight module. Compared with the prior art, the light-emitting keyboard and backlight module of the present invention has a thinner thickness, improved brightness and more uniform optical coupling through innovative structure and circuit design and control methods, so it can reduce power and power consumption, and achieve Thinning effect.

To achieve the above objective, the present invention provides a light-emitting keyboard including a first keycap group and a second keycap group, and a backlight module. The first keycap group and the second keycap group have plural keycaps respectively. The backlight module has a first light emitting unit, a second light emitting unit, a first resistor, a second resistor, a light guide plate and a circuit board. The first light-emitting unit has a plurality of light-emitting elements, and each light-emitting element is correspondingly arranged under each keycap of the first keycap group, and the light-emitting elements in the first light-emitting unit are electrically connected in parallel with each other; the second light-emitting unit has a plurality of light-emitting elements, Each light-emitting element is correspondingly disposed under each keycap of the second keycap group, and the light-emitting elements in the second light-emitting unit are electrically connected in parallel with each other. The first resistor is electrically connected in series with the first light-emitting unit, and the second resistor is electrically connected in series with the second light-emitting unit; the light guide plate is provided with a plurality of through holes; the circuit board is arranged under the light guide plate, the first light-emitting unit, the second light-emitting unit, The first resistor and the second resistor are arranged on the circuit board. Wherein, the sum of a first light-emitting area of the keycaps of the first keycap group is not equal to the sum of a second light-emitting area of the keycaps of the second keycap group.

In an embodiment, when the sum of the first light-emitting area is less than the sum of the second light-emitting area, a first current flowing through the light-emitting elements in the first light-emitting unit is greater than that flowing through the light-emitting elements in the second light-emitting unit. A second current.

In an embodiment, when the sum of the first light-emitting area is less than the sum of the second light-emitting area, the resistance of the first resistor is less than the resistance of the second resistor.

In an embodiment, when the sum of the first light-emitting area is less than the sum of the second light-emitting area, the average light-emitting brightness of each light-emitting element of the first light-emitting unit is greater than the average light-emitting brightness of each light-emitting element of the second light-emitting unit.

In an embodiment, the number of the light-emitting elements of the first light-emitting unit or the second light-emitting unit is greater than the number of resistors connected in series with the light-emitting element.

In one embodiment, each light-emitting element has a plurality of light-emitting surfaces perpendicular to the light-emitting surfaces of the keycaps.

In one embodiment, the light-emitting surfaces include a first light-emitting surface, and the normal direction of the first light-emitting surface and the side of the corresponding key cap form an acute angle, and the acute angle is 35 degrees to 60 degrees.

In one embodiment, the light-emitting keyboard further has a bottom plate, which is arranged under the first keycap group and the second keycap group. The bottom plate is provided with a plurality of openings corresponding to each keycap and each light-emitting element, and the through holes respectively align There should be some openings. And the backlight module further has a light-shielding sheet, which includes a plane area and a plurality of convex areas, the plane area is arranged between the bottom plate and the light guide plate, and each convex area corresponds to each opening. Each light-emitting element in the first light-emitting unit and the second light-emitting unit is accommodated in an accommodation space formed by each opening, each through hole and each convex area.

In one embodiment, a light reflecting part is provided between the light emitting element and the raised area, and the light reflecting part is only arranged in the area above the light emitting element to reflect the light emitted by the light emitting element.

In one embodiment, the circuit board has a reflective layer light guide plate, which reflects part of the light emitted by each light-emitting element to the light guide plate, and the reflective layer is exposed in the through hole.

In addition, the present invention provides a backlight module having a light guide plate, a first light emitting unit, a second light emitting unit, a first resistor, a second resistor, a circuit board, and a light-shielding sheet. The light guide plate includes one side, a first backlight area and a second backlight area. The first backlight area and the second backlight area respectively have a plurality of keycap backlight areas, and each keycap backlight area has a through hole. The first light-emitting unit has a plurality of light-emitting elements, and each light-emitting element is arranged corresponding to each through hole in each keycap backlight area of the first backlight area, and the light-emitting elements in the first light-emitting unit are electrically connected in parallel with each other; the second light-emitting unit It has a plurality of light-emitting elements, and each light-emitting element is arranged corresponding to each through hole in each key cap backlight area of the second backlight area, and the light-emitting elements in the second light-emitting unit are electrically connected in parallel with each other. The first resistor is electrically connected in series with the first light emitting unit, and the second resistor is electrically connected in series with the second light emitting unit. The circuit board is arranged under the light guide plate, and the first light emitting unit, the second light emitting unit, the first resistor and the second resistor are arranged on the circuit board. The shading sheet includes a plane area and a plurality of convex areas. The plane area is provided with a plurality of openings to emit light. Each light-emitting element is arranged corresponding to each convex area. Wherein, the sum of a first area of the openings in the keycap backlight areas corresponding to the first backlight area and a second area of the openings in the keycap backlight areas corresponding to the second backlight area The sum is not equal.

In an embodiment, each light-emitting element has a plurality of light-emitting surfaces perpendicular to the upper surface of the light guide plate.

In one embodiment, each light-emitting element in the first light-emitting unit and the second light-emitting unit protrudes from each through hole and is accommodated in an accommodation space formed by each through hole and each convex area.

Hereinafter, the preferred embodiments of the illuminated keyboard and the backlight module according to the present invention will be described with reference to related drawings, in which the same components will be described with the same reference symbols.

1, the illuminated keyboard 100 includes a keyboard assembly 10, a bottom plate 1 and a backlight module 20.

2 and 3, FIG. 2 is a schematic top view of an illuminated keyboard according to an embodiment of the new type, and FIG. 3 is a partial enlarged view of the illuminated keyboard according to an embodiment of the new type. A top view of the self-luminous keyboard 100, the keyboard assembly 10 includes a plurality of key caps 13 of different sizes, such as function keys (F1 to F12), number keys, letter keys, input keys, and so on. According to an embodiment, the keyboard assembly 10 is divided into a plurality of keycap groups 11a-11f, including a first keycap group 11a and a second keycap group 11b. The first keycap group 11a includes a function key area, the second keycap group 11b includes a letter key area, and the first keycap group 11a and the second keycap group 11b each have a plurality of keycaps 13. The top surface 13a of each keycap 13 is marked with a symbol note corresponding to the character or function of the keycap. The symbol note can be any symbol required by the keyboard function, such as but not limited to English words, numbers, special symbols, or various Input method code, etc. The symbol remarks of the keycap 13 are designed as a character light-emitting area 131 with a semi-transparent design. Therefore, the light emitted by the backlight module 20 can be transmitted through the character light-emitting area 131 to make the keycap 13 emit light for the user to see and recognize.

Taking one of the keycaps shown in FIG. 3 as an example, referring to FIGS. 4 and 5 according to the center section line A-A, the structure of the new illuminated keyboard will be described.

An elastic component 16 is provided under each key cap 13 to support the key cap 13. The keyboard assembly 10 is provided with a bottom plate 1 below the keyboard assembly 10 and the backlight module 20. The bottom plate 1 is made of various metals such as, but not limited to, iron, stainless steel, nickel, copper, or resin, plastic, rubber and the like. The bottom plate 1 can be designed for light transmission or opacity. The bottom plate 1 is provided with a plurality of openings 18a corresponding to the position of the character light-emitting area 131 of each keycap 13, and a plurality of openings 18b are opened corresponding to each light-emitting element 3 of each keycap 13, and the opening 18b is approximately located at the center of the keycap 13. Below, the light-emitting element 3 can be accommodated. The openings 18a, 18b can be round holes, but can also be square, polygonal, or other shapes.

The backlight module 20 is located under the keyboard assembly 10 and the bottom plate 1, and includes a light-shielding sheet 2, a light guide plate 4, a plurality of light-emitting elements 3 and a circuit board 5. The backlight module 20 is divided into a plurality of light emitting units, and each light emitting unit has a plurality of light emitting elements 3. In this embodiment, one keycap 13 corresponds to one light-emitting element 3 respectively.

The shading sheet 2 includes a flat area 21 and a plurality of convex areas 22. The plane area 21 is arranged between the bottom plate 1 and the light guide plate 4, and an opening 212 is provided at the position corresponding to the character light emitting area 131 of each key cap 13 for light to enter the character light emitting area 131 of each key cap 13 through the opening 212 light source. Each convex area 22 is opaque and shields light, and is disposed above each light-emitting element 3 corresponding to the position of the opening 18 b to accommodate each light-emitting element 3. The light emitted from the upper light-emitting surface 3 a of the light-emitting element 3 can be reflected by the convex area 22 of the light-shielding sheet 2, enter the light guide plate 4 and then emit light through the opening 212. The light-shielding sheet 2 has properties of shielding light and reflecting light.

Refer to FIG. 6, which is a schematic top view of a keycap according to an embodiment of the present invention. From the key cap 13, the first layer is the bottom plate 1. The bottom plate 1 has a circular opening 18b in the center directly below the key cap 13, and a plurality of openings 18a are provided around it. The second layer further down is the light-shielding sheet 2. The light-shielding sheet 2 is turned at an angle and protrudes at the opening 18b to form a convex area 22, and the rest is a flat area 21. The flat area 21 is provided with an opening 212 to emit light. In addition, a light guide plate 4 is provided under the light shielding sheet 2. The light guide plate 4 is provided with a through hole 48 under the convex area 22, and the through hole 48 accommodates the light emitting element 3 (not shown). The light guide plate 4 is provided with a light guide pattern 45 at the corresponding opening 212 to facilitate light guide. That is to say, referring to Figures 5 and 6, at the approximate center of the keycap 13, from the keycap 13 downward corresponding to the opening 18b of the bottom plate 1, the convex area 22 of the light-shielding sheet 2, and the light-emitting element 3. It is the bottom plate 1 or the opening 18a, the plane area 21 of the light-shielding sheet 2 and the opening 212, under which a light guide plate 4 is arranged. As the size of each keycap 13 is different and the light source design required, the size of the character light emitting area 131 is different, and the size of the corresponding opening 212 is also different. The position and area of the opening 212 can be adjusted according to requirements.

In this embodiment, the light-emitting element 3 may be a rectangular or square light-emitting diode element with multiple light-emitting surfaces. 4, 5 and 7, the light-emitting element 3 is a six-sided cube with a first light-emitting surface 31, a second light-emitting surface 32, a third light-emitting surface 33, a fourth light-emitting surface 34, an upper light-emitting surface 3a, and a bottom surface 3b. , The first light-emitting surface 31, the second light-emitting surface 32, the third light-emitting surface 33, and the fourth light-emitting surface 34 are perpendicular to the upper light-emitting surface 3a and/or the bottom surface 3b.

7, the upper light-emitting surface 3a of the light-emitting element 3 faces the top surface 13a of the keycap 13, and the first light-emitting surface 31, the second light-emitting surface 32, the third light-emitting surface 33, and the fourth light-emitting surface 34 are perpendicular to the top surface of the keycap 13 The top surface 13a is installed under the key cap 13. According to an embodiment, when the light emitting element 3 is installed under the key cap 13, it is rotated by an angle θ, so that the light emitted by the four light emitting surfaces 31 to 34 of the light emitting element 3 can be better extended to the four corners of the key cap 13 to obtain Good luminous efficiency and uniform luminous effect are obtained. The transposition angle θ is about 30 to 60 degrees. Preferably, the transposition angle θ is about 30 to 55 degrees. Moreover, one of the light-emitting surfaces of the light-emitting element 3, such as the normal direction of the first light-emitting surface 31, and the side 13S of the keycap 13 or the side 4S of the light guide plate 4 corresponding to the light-emitting element 3 form an acute angle θ1, The setting angle θ and the acute angle θ1 are complementary angles (the sum is 90 degrees), so the acute angle θ1 is approximately 30 to 60 degrees, and preferably, the acute angle θ1 is approximately 35 to 60 degrees.

In one embodiment, a light reflecting portion 37 is provided between the light emitting element 3 and the raised area 22, and the light reflecting portion 37 is only provided in the area above the light emitting element 3. The light reflecting portion 37 is attached to the upper light emitting surface 3a of the light emitting element 3 to reflect the light emitted by the light emitting element 3 and guide the light into the light guide plate 4. The light reflecting portion 37 may be white or other colors that facilitate reflection. The light reflecting part 37 can be set independently or integrally formed with the light emitting element 3, so that the light can be reflected back and forth in the light emitting element 3, and the light emitted by the upper light emitting surface 3a can be collected to the surroundings and transmitted through the surrounding light emitting surfaces 31-34 It is incident on the light guide plate 4 to increase the amount of light entering the light guide plate 4.

The light guide plate 4 is a thick sheet with a lateral side 4S. The light guide plate 4 is divided into a plurality of backlight regions 14a-14f corresponding to the keycap groups 11a-11f, including a first backlight region 14a and a second backlight region 14b. Each backlight region has a plurality of keycap backlight regions. The backlight area is roughly located under the vertical projection of each keycap 13. The first backlight area 14a has a plurality of keycap backlight areas 141a; the second backlight area 14b has a plurality of keycap backlight areas 141b. A through hole 48 is provided in each keycap backlight area corresponding to the light-emitting element 3 to accommodate each light-emitting element 3. Each light-emitting element 3 protrudes from the through hole 48 and is accommodated in the accommodating space formed by the opening 18 b of the bottom plate 1, the through hole 48 of the light guide plate 4 and the convex area 22 of the light-shielding sheet 2. The shape of the through hole 48 can be rectangular, square, round, polygonal, irregular, etc., so that the light emitted from the multiple light-emitting surfaces 31 to 34 of the light-emitting element 3 enters the multiple light-incident surfaces around the through hole 48 to achieve a suitable Mixed light effect. The light emitted by the light emitting element 3 enters the light guide plate 4 and is totally reflected and transmitted in the light guide plate 4, and when it encounters the light guide pattern 45, it is reflected and emits light through the opening 212. The first light exit surface 31, the second light exit surface 32, the third light exit surface 33, and the fourth light exit surface 34 are perpendicular to the upper surface 4 a of the light guide plate 4.

The circuit board 5 is disposed under the light guide plate 4 and has a first flat surface 5 a facing the light guide plate 4 and a second flat surface 5 b facing the light guide plate 4. According to an embodiment, the first plane 5a is coated with a reflective layer 51 as a reflection and shading material, which can reflect part of the light emitted by the light-emitting element 3 to the light guide plate 4. The through hole 48 of the light guide plate 4 is larger than the size of the light emitting element 3, and the reflective layer 51 can be exposed in the through hole 48 of the light guide plate 4. The light emitting element 3 can be close to or close to the reflective layer 51, so that the light is directly reflected on the reflective layer 51, and the light utilization rate is improved. The reflective layer 51 may be white, or other colors that facilitate reflection. The reflective layer 51 and the circuit board 5 can be integrally formed to make the light incident place more flat, so as to reduce the wear when the light enters, and improve the optimal utilization of the light incident efficiency. The circuit board 5 may be, but is not limited to, a flexible circuit board (FPC).

Referring to Figure 8, the serial-parallel circuit design of the luminous keyboard is described. The circuit on the circuit board 5 is composed of a plurality of light-emitting circuit blocks L1, L2...Ln electrically connected in parallel, and each light-emitting circuit block L1, L2...Ln respectively corresponds to each key of the light-emitting keyboard 100 The cap groups 11a-11f, such as the first keycap group 11a, the second keycap group 11b, and so on.

Each light-emitting circuit block L1, L2...Ln is composed of at least one resistor and a plurality of light-emitting elements 3, and is connected to the controller F. The multiple light-emitting elements 3 are electrically connected in parallel with each other to form each light-emitting unit, and then connected in series with a resistor to facilitate the control of each block. In each light-emitting unit, since multiple light-emitting elements 3 are connected in parallel and then connected in series with resistors in a partitioned manner, the number N of light-emitting elements 3 in the light-emitting unit is not equal to the number n of resistors connected in series in the light-emitting unit. The number N of 3 is greater than the number n of resistors connected in series with the light-emitting unit.

The resistance can be a variable resistance or an equivalent resistance formed by multiple resistances. The light-emitting circuit blocks L1, L2...Ln can refer to the light-emitting area of the keycap required by each corresponding light-emitting unit, such as keycap groups of different keycap sizes including function keys, back keys, and letter keys , And through the partition method, to achieve the control of the brightness performance of different areas. In the first light-emitting circuit block L1, the first resistor R1 is connected in series with the first light-emitting unit 15a, and in the second light-emitting circuit block L2, the second resistor R2 is connected in series with the second light-emitting unit 15b. The first light-emitting unit 15a, the second light-emitting unit 15b, the first resistor R1 and the second resistor R2 are arranged on the circuit board 5.

According to an embodiment, the first light emitting unit 15a corresponds to the first keycap group 11a, and the second light emitting unit 15b corresponds to the second keycap group 11b as a light source. Since the first keycap group 11a includes a functional key area with a small area of the top surface 13a of the keycap and a small sum of the area of the character light-emitting area 131, the second keycap group 11b includes a large area of the top surface 13a of the keycap. The total area of the character light-emitting area 131 is also larger than the letter key area. Therefore, the first light-emitting unit 15a needs a larger current than the second light-emitting unit 15b, so that the light-emitting element 311 of the first light-emitting unit 15a can generate The light-emitting element 312 of the light-emitting unit 15b has a large light-emitting power to balance the light-emitting brightness and make the overall vision more balanced. In this way, the best uniformity of the overall light emission can also be achieved in the process of reducing component costs. In addition, the number of light emitting elements 3 of each light emitting unit can be changed according to the requirements of different partitioning methods and design changes.

Furthermore, if the area of the character light emitting area 131 of the keycap 13 in each keycap group is set as the light-emitting area of each keycap 13, then the light-emitting area of the first keycap group 11a corresponding to the first light-emitting unit 15a is the first The sum of the light-emitting area of each keycap 13 in the keycap group 11a is set as the first light-emitting area sum A1; the light-emitting area of the second keycap group 11b corresponding to the second light-emitting unit 15b is each of the second keycap group 11b The total light-emitting area of the keycap 13 is set as the second light-emitting area total A2. The first total light-emitting area A1 and the second total light-emitting area A2 are not equal. Furthermore, the first total light-emitting area A1 is smaller than the second total light-emitting area A2.

In addition, the first backlight area 14a corresponding to the first keycap group 11a has a plurality of keycap backlight areas 141a, and each keycap backlight area 141a emits light through the corresponding openings 212. The second backlight area 14b corresponding to the second keycap group 11b has a plurality of keycap backlight areas 141b, and each keycap backlight area 141b emits light through the corresponding openings 212. The larger the area of the top surface 13a of each keycap 13 is, the larger the area of the opening 212 corresponding to each keycap 13 is, and the two are proportional.

Therefore, the total area of the openings 212 of the keycap backlight area 141a corresponding to the first backlight area 14a is set as the first total area A01, and the total area of the openings 212 of the keycap backlight area 141b corresponding to the second backlight area 14b is set When it is the second total area A02, the first total area A01 and the second total area A02 are not equal. Furthermore, the first total area A01 is smaller than the second total area A02. Similarly, since the first total area A01 of the first backlight area 14a is smaller than the second total area A02 of the second backlight area 14b, the first light-emitting unit 15a needs a larger current than the second light-emitting unit 15b, so that the first The light-emitting element 311 of the light-emitting unit 15a generates a higher light-emitting power than the light-emitting element 312 of the second light-emitting unit 15b to balance the light-emitting brightness and make the overall vision more balanced.

According to an embodiment, the resistance in series with the light-emitting unit can be adjusted to control the current. When the sum A1 of the first light-emitting area of the first keycap group 11a is less than the sum A2 of the second light-emitting area of the second keycap group 11b, or the sum A01 of the first area corresponding to the first backlight area 14a is less than that corresponding to the second backlight area When the total second area of 14b is A02, the resistance of the first resistor R1 is set to be smaller than the resistance of the second resistor R2, so that the first current I1 flowing through the light-emitting element 311 of the first light-emitting unit 15a is greater than that flowing through the second The second current I2 of the light emitting element 312 of the light emitting unit 15b makes the average brightness of the light emitting element 311 of the first light emitting unit 15a greater than the average brightness of the light emitting element 312 flowing through the second light emitting unit 15b. In addition, since the distance between the circuit board line and the power supply (not shown) is longer, the current will be reduced due to line impedance loss. Therefore, series resistors with different resistance values can be used to adjust the resistance design to adjust each zone The magnitude of the current.

To sum up, according to some embodiments, the light-emitting keyboard 100 accommodates the light-emitting element 3 in the accommodating space formed by the opening 18b of the base plate 1, the through hole 48 of the light guide plate 4, and the convex area 22 of the light-shielding sheet 2. Reduce the overall thickness, and distinguish different circuit blocks according to different light-emitting areas of different keycap groups to simplify components. The light-emitting keyboard and the backlight module of the new type have a thinner thickness, improved brightness and more uniform optical coupling through innovative structure and circuit design matching control methods, thereby reducing power and power consumption, and achieving a thinner effect.

100: illuminated keyboard 10: keyboard assembly 11a: The first keycap group 11b: The second keycap group 11c~11f: keycap group 13: keycap 13a: Top surface 13S: side 131: Character light emitting area 14a: The first backlight zone 14b: Second backlight zone 14c~14f: Backlight area 141a, 141b: keycap backlight area 15a: The first light-emitting unit 15b: second light-emitting unit 16: Elastic component 1: bottom plate 18a, 18b: opening 20: Backlight module 2: shading sheet 21: plane area 212: open 22: raised area 3,311,312: Light-emitting components 3a: Top glossy surface 3b: bottom surface 31: The first shiny surface 32: The second glossy surface 33: Third Glossy Surface 34: Fourth Glossy Surface 37: reflective part 4: Light guide plate 4S: side 4a: upper surface 45: light guide pattern 48: Through hole 5: Circuit board 5a: first plane 5b: second plane 51: reflective layer R1: first resistance R2: second resistor I1: first current I2: second current A1, A2: Sum of luminous area A01, A02: Total area L1~Ln: Light-emitting circuit block θ: Angle θ1: acute angle F: Controller A-A: Section line

FIG. 1 is a schematic diagram of an illuminated keyboard according to an embodiment of the new type. 2 is a schematic top view of an illuminated keyboard according to an embodiment of the new type. Fig. 3 is a partial enlarged view of the illuminated keyboard according to an embodiment of the new type. 4 is a schematic partial cross-sectional view of an illuminated keyboard according to an embodiment of the new type. FIG. 5 is a schematic partial cross-sectional view of an illuminated keyboard according to an embodiment of the new type. Fig. 6 is a schematic top view of a keycap according to an embodiment of the new type. FIG. 7 is a perspective view of a light-emitting element according to an embodiment of the new type. FIG. 8 is a schematic diagram of a series-parallel circuit of a backlight module according to an embodiment of the new type.

100: illuminated keyboard

10: keyboard assembly

13: keycap

13a: Top surface

16: Elastic component

1: bottom plate

18b: Opening

20: Backlight module

2: shading sheet

21: plane area

22: raised area

3: Light-emitting element

3a: Top glossy surface

3b: bottom surface

37: reflective part

4: Light guide plate

48: Through hole

5: Circuit board

Claims (20)

A luminous keyboard, including: A first keycap group and a second keycap group, the first keycap group and the second keycap group respectively have plural keycaps; A backlight module with: A first light-emitting unit having a plurality of light-emitting elements, each of the light-emitting elements of the first light-emitting unit is correspondingly disposed under each of the keycaps of the first keycap group, and the light-emitting elements in the first light-emitting unit are electrically connected to each other. Sexual parallel; A second light-emitting unit having a plurality of light-emitting elements, each of the light-emitting elements of the second light-emitting unit is correspondingly disposed under each of the keycaps of the second keycap group, and the light-emitting elements in the second light-emitting unit are electrically connected to each other. Sexual parallel; A first resistor electrically connected in series with the first light-emitting unit; A second resistor electrically connected in series with the second light-emitting unit; A light guide plate with a plurality of through holes; and A circuit board arranged under the light guide plate, the first light-emitting unit, the second light-emitting unit, the first resistor, and the second resistor are arranged on the circuit board; Wherein, the sum of a first light-emitting area of the keycaps of the first keycap group is not equal to the sum of a second light-emitting area of the keycaps of the second keycap group. The light-emitting keyboard according to claim 1, wherein when the sum of the first light-emitting area is less than the sum of the second light-emitting area, a first current flowing through the light-emitting elements in the first light-emitting unit is greater than that flowing through the second light-emitting unit. A second current of the light-emitting elements in the light-emitting unit. The illuminated keyboard according to claim 1, wherein when the sum of the first luminous area is less than the sum of the second luminous area, the resistance of the first resistor is less than the resistance of the second resistor. The light-emitting keyboard according to claim 1, wherein when the sum of the first light-emitting area is less than the sum of the second light-emitting area, the average light-emitting brightness of each light-emitting element of the first light-emitting unit is greater than that of each light-emitting element of the second light-emitting unit The average luminous brightness of the element. The light-emitting keyboard according to claim 1, wherein the number of the light-emitting elements of the first light-emitting unit or the second light-emitting unit is greater than the number of resistors connected in series with the light-emitting elements. The light-emitting keyboard according to claim 1, wherein each light-emitting element has a plurality of light-emitting surfaces perpendicular to the top surfaces of the keycaps. The illuminated keyboard according to claim 6, wherein the light-emitting surfaces include a first light-emitting surface, and the normal direction of the first light-emitting surface and the corresponding side of the keycap form an acute angle, and the acute angle is 35 degrees To 60 degrees. According to claim 1, the illuminated keyboard further has a bottom plate, which is disposed under the first key cap group and the second key cap group, and the bottom plate is provided with a plurality of openings corresponding to each key cap and each light emitting element , The through holes correspond to the openings respectively; and the backlight module further has: A light-shielding sheet, comprising a plane area and a plurality of convex areas, the plane area is disposed between the bottom plate and the light guide plate, and each convex area corresponds to each opening; Each of the light-emitting elements of the first light-emitting unit and the second light-emitting unit is accommodated in an accommodation space formed by each of the openings, each of the through holes, and each of the convex areas. The light-emitting keyboard according to claim 8, wherein a light-reflecting part is provided between the light-emitting element and the protruding area, and the light-reflecting part is only provided in the area above the light-emitting element to reflect the light emitted by the light-emitting element. The light-emitting keyboard according to claim 1, wherein the circuit board has a reflective layer facing the light guide plate to reflect part of the light emitted by each light-emitting element to the light guide plate, and the reflective layer is exposed in the through hole. A backlight module, including: A light guide plate includes a side edge, a first backlight area and a second backlight area. The first backlight area and the second backlight area each have a plurality of keycap backlight areas, and each of the keycap backlight areas is provided with a through hole; A first light-emitting unit having a plurality of light-emitting elements, each of the light-emitting elements of the first light-emitting unit is arranged corresponding to each of the through holes in each of the keycap backlight areas of the first backlight area, and the first light-emitting unit The light-emitting elements are electrically connected in parallel with each other; A second light-emitting unit having a plurality of light-emitting elements, each of the light-emitting elements of the second light-emitting unit is arranged corresponding to each of the through holes in each of the keycap backlight areas of the second backlight area, and the second light-emitting unit The light-emitting elements are electrically connected in parallel with each other; A first resistor electrically connected in series with the first light-emitting unit; A second resistor electrically connected in series with the second light-emitting unit; A circuit board arranged under the light guide plate, the first light-emitting unit, the second light-emitting unit, the first resistor and the second resistor are arranged on the circuit board; and A light-shielding sheet comprising a plane area and a plurality of convex areas, the plane area is provided with a plurality of openings to emit light, and each light-emitting element is arranged corresponding to each convex area; Wherein, the sum of a first area of the openings in the keycap backlight areas corresponding to the first backlight area and a first area of the openings in the keycap backlight areas corresponding to the second backlight area The sum of the two areas is not equal. The backlight module according to claim 11, wherein when the sum of the first area is less than the sum of the second area, a first current flowing through the light emitting elements in the first light emitting unit is greater than that flowing through the second light emitting unit A second current of the light-emitting elements in the cell. The backlight module according to claim 11, wherein when the sum of the first area is less than the sum of the second area, the resistance of the first resistor is less than the resistance of the second resistor. The backlight module of claim 11, wherein when the sum of the first area is less than the sum of the second area, the average light-emitting brightness of each light-emitting element of the first light-emitting unit is greater than that of each light-emitting element of the second light-emitting unit The average luminous brightness. The backlight module according to claim 11, wherein the number of the light-emitting elements of the first light-emitting unit or the second light-emitting unit is greater than the number of resistors connected in series with the light-emitting elements. The backlight module according to claim 11, wherein each of the light-emitting elements has a plurality of light-emitting surfaces perpendicular to the upper surface of the light guide plate. The backlight module according to claim 16, wherein the light-emitting surfaces include a first light-emitting surface, the normal direction of the first light-emitting surface forms an acute angle with the side edge, and the acute angle is 35 degrees to 60 degrees. The backlight module of claim 11, wherein a reflective portion is provided between the light-emitting element and the protruding area, and the reflective portion is only provided in an area above the light-emitting element to reflect the light emitted by the light-emitting element. The backlight module according to claim 11, wherein each of the light-emitting elements in the first light-emitting unit and the second light-emitting unit protrudes from each of the through holes and is accommodated by each of the through holes and the convex In the accommodation space formed by the starting area. The backlight module according to claim 11, wherein the circuit board has a reflective layer facing the light guide plate, and reflects part of the light emitted by each light-emitting element to the light guide plate, and the reflective layer is exposed in the through hole.

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