Backlight keyboard device

Abstract

A backlight keyboard device comprises a light-emitting unit and a thin film circuit unit. The light-emitting unit comprises at least one light-emitting part. The thin film circuit unit comprises a substrate, a lower covering film layer arranged on the top side of the substrate, a lower copper laying layer arranged on the top side of the lower covering film layer, a base material layer arranged on the top side of the lower copper laying layer and an upper copper laying layer arranged on the top side of the base material layer. The circuit board comprises an upper copper laying layer, an upper covering film layer arranged on the top side of the upper copper laying layer, a fixed adhesive layer arranged on the top side of the upper covering film layer, an upper circuit layer arranged on the top side of the fixed adhesive layer, and a plurality of inductive resistors arranged between the fixed adhesive layer and the upper circuit layer, the upper circuit layer, the fixing glue layer and the upper covering film layer jointly define at least one containing groove for containing the light-emitting part, so that the overall thickness is reduced on the premise that the ghost key prevention function is achieved.

Description

Technical Field

[0001] The present invention relates to a backlight keyboard device, in particular to a backlight keyboard device with an anti-ghosting function. Background Art

[0002] An input device as shown in Taiwan Patent Certificate No. M403696, includes a switch module, a comparator, a switching unit, and a processing module. The switch module includes multiple drive lines that respectively receive multiple drive signals, multiple sensing lines, multiple switches, and multiple resistors. The comparator includes a first input terminal, a second input terminal for receiving a reference signal, and an output terminal for outputting a comparison signal. The switching unit is controlled by a set of control signals to electrically connect at least one of the sensing lines to the first input terminal of the comparator. The processing module is used to set the drive signal, the reference signal, and at least one of the control signals so that the comparison signal indicates whether at least one of all switches is turned on, whether at least one of multiple switches is turned on, or whether one switch is turned on, to avoid the generation of so-called "ghost keys."

[0003] However, as time goes by, people begin to hope to add a lighting function to the above-mentioned existing input devices to facilitate use in low-light environments. However, if a backlight module is installed on the bottom side of the above-mentioned existing input devices with anti-ghosting function, the overall thickness will be greatly increased. Summary of the Invention

[0004] An object of the present invention is to provide a backlight keyboard device capable of reducing the overall thickness.

[0005] The backlight keyboard device of the present invention includes a light-emitting unit and a thin film circuit unit, the light-emitting unit includes at least one light-emitting component, and a driving circuit electrically connected to the light-emitting component and used to drive the light-emitting component to emit light, the thin film circuit unit includes a substrate, a lower covering film layer arranged on the top side of the substrate, a lower copper layer arranged on the top side of the lower covering film layer, a base material layer arranged on the top side of the lower copper layer, an upper copper layer arranged on the top side of the base material layer, an upper covering film layer arranged on the top side of the upper copper layer, a fixed adhesive layer arranged on the top side of the upper covering film layer, an upper circuit layer arranged on the top side of the fixed adhesive layer, and a plurality of inductive resistors arranged between the fixed adhesive layer and the upper circuit layer, the upper circuit layer, the fixed adhesive layer and the upper covering film layer jointly define at least one receiving groove for accommodating the light-emitting component.

[0006] In the backlight keyboard device of the present invention, each sensing resistor is composed of at least one printed resistor, and the material of the printed resistor is carbon ink.

[0007] In the backlight keyboard device of the present invention, the thin film circuit unit also includes an anisotropic conductive film, the upper covering film layer defines a plurality of first window areas for the anisotropic conductive film to enter, and the fixed adhesive layer defines a plurality of second window areas for the anisotropic conductive film to enter, so that the anisotropic conductive film can pass through the first window areas and the second window areas in the up and down directions to conduct the upper copper layer and the upper circuit layer.

[0008] In the backlight keyboard device of the present invention, the upper circuit layer comprises a film portion and a circuit portion laid on the bottom side of the film portion, and the circuit portion and the sensing resistor are laid together on the bottom side of the film portion.

[0009] In the backlight keyboard device of the present invention, the driving circuit is composed of the lower copper layer and the upper copper layer.

[0010] The beneficial effects of the present invention are as follows: the upper circuit layer, the fixed adhesive layer and the upper covering film layer of the thin film circuit unit are used to jointly define the groove for accommodating the light-emitting component, so as to avoid the light-emitting component protruding and increasing the overall thickness, and the lower copper layer, the upper copper layer, the upper circuit layer and the sensing resistor together constitute the circuit structure required for the anti-ghosting circuit (not shown in the figure), thereby reducing the overall thickness while realizing the anti-ghosting function. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Other features and effects of the present invention will be more clearly seen in the following embodiments with reference to the accompanying drawings, in which:

[0012] Figure 1 is a perspective exploded view illustrating a light emitting unit and a thin film circuit unit of an embodiment of a backlit keyboard device of the present invention;

[0013] Figure 2 is a fragmentary side view of the embodiment;

[0014] Figure 3 is an incomplete exploded perspective view of the embodiment;

[0015] Figure 4 It is another incomplete exploded perspective view of the embodiment. DETAILED DESCRIPTION

[0016] See Figures 1 to 4 An embodiment of the backlight keyboard device of the present invention includes a light-emitting unit 4 and a thin film circuit unit 5.

[0017] The light-emitting unit 4 includes a plurality of light-emitting elements 41 and a driving circuit 42. The light-emitting elements 41 are sub-millimeter light-emitting diodes (Mini LEDs). For the sake of simplicity, the following paragraphs will only use one of the light-emitting elements 41 as an example for description.

[0018] The thin-film circuit unit 5 is stacked along a vertical direction D1 and includes a substrate 51, a lower cover film layer 52 mounted on top of the substrate 51, a lower copper layer 53 disposed on top of the lower cover film layer 52, a base material layer 54 disposed on top of the lower copper layer 53, an upper copper layer 55 disposed on top of the base material layer 54, an upper cover film layer 56 disposed on top of the upper copper layer 55, a fixing adhesive layer 57 disposed on top of the upper cover film layer 56, an upper circuit layer 58 disposed on top of the fixing adhesive layer 57, a light shielding layer 59 disposed on top of the upper circuit layer 58, a plurality of sensing resistors 60 disposed between the fixing adhesive layer 57 and the upper circuit layer 58, and an anisotropic conductive adhesive film 61. The upper circuit layer 58, the fixing adhesive layer 57, and the upper cover film layer 56 collectively define a cavity 50 along the vertical direction D1 for accommodating the light-emitting element 41.

[0019] The lower copper layer 53 and the upper copper layer 55 together constitute the circuit structure required by the driving circuit 42 to drive the light-emitting element 41 to emit light. In this way, there is no need to add a driving circuit board on the bottom side of the substrate 51, thereby reducing the overall thickness. Furthermore, the lower copper layer 53, the upper copper layer 55, the upper circuit layer 58 and the sensing resistor 60 together constitute the circuit structure required for an anti-ghosting circuit (not shown) to achieve the anti-ghosting function. The anti-ghosting circuit can use the circuit layout method mentioned in the prior art paragraph, which is not the feature of this case, so it will not be described here.

[0020] See Figure 3 The upper circuit layer 58 comprises a thin film portion 581 and a circuit portion 582 disposed on the underside of the thin film portion 581. In this embodiment, the circuit portion 582 and the sensing resistors 60 are disposed on the underside of the thin film portion 581. Each sensing resistor 60 is composed of at least one printed resistor made of carbon ink. Figure 3 Extracted from Figure 1 The part in the figure is used to illustrate the relationship between one of the sensing resistors 60, the upper circuit layer 58, the fixing glue layer 57 and the upper cover film layer 56. Figure 3 Only one of the sensing resistors 60 is shown.

[0021] See Figure 3The upper cover film layer 56 defines a plurality of first window areas 561 for the anisotropic conductive adhesive film 61 to enter, and the fixed adhesive layer 57 defines a plurality of second window areas 571 for the anisotropic conductive adhesive film 61 to enter. Figure 4 extracted from Figure 1 different from Figure 3 Another part of the anisotropic conductive adhesive film 61, the upper copper layer 55, the upper cover film layer 56, the fixed adhesive layer 57 and the upper circuit layer 58 is shown to illustrate the arrangement relationship. For simplicity, Figure 4 Only one of the first window areas 561 and one of the second window areas 571 are shown.

[0022] The anisotropic conductive adhesive film 61 is arranged between the upper copper layer 55 and the upper circuit layer 58, and is connected by a pressing and heating process to the portions of the upper copper layer 55 corresponding to the first window areas 561 and the second window areas 571 and the portions of the circuit portion 582 corresponding to the first window areas 561 and the second window areas 571 in the up-down direction D1.

[0023] In actual use, the embodiment can determine whether the portions of the upper copper layer 55 corresponding to the first window areas 561 and the second window areas 571 and the portions of the circuit portion 582 corresponding to the first window areas 561 and the second window areas 571 are mutually closed or mutually open by whether the anisotropic conductive adhesive film 61 is pressed to be conductive, thereby forming a plurality of switches (not shown in the figure). In other words, the anisotropic conductive adhesive film 61 can close the circuit portion 582 of the upper copper layer 55 and the upper circuit layer 58 by passing through the first window areas 561 and the second window areas 571 in the up-down direction D1.

[0024] Then, the embodiment can realize the ghost key prevention function in combination with the control process shown in the prior art paragraph, thereby reducing the overall thickness before having the ghost key prevention function. For example, the thin film circuit unit 5 of the embodiment can define the switches connected in series with the sensing resistors 60, respectively, so that each sensing resistor 60 and the corresponding switch form a switch unit (not shown in the figure), which is used to determine the conduction state of the switch of each switch unit to realize the ghost key prevention function.

[0025] Therefore, the backlight keyboard device of the present application can achieve the following effects:

[0026] (1) The upper circuit layer 58, the fixing adhesive layer 57 and the upper covering film layer 56 of the thin film circuit unit 5 define the receiving groove 50 for accommodating the light-emitting component 41, so as to prevent the light-emitting component 41 from protruding and increasing the overall thickness. The lower copper layer 53, the upper copper layer 55, the upper circuit layer 58 and the sensing resistor 60 together constitute the circuit structure required for the anti-ghosting circuit, thereby reducing the overall thickness while achieving the anti-ghosting function.

[0027] (2) By printing the sensing resistor 60 on the upper cover film layer 56 and the fixing adhesive layer 57, the device is not only thinner and softer than conventional resistors (carbon film resistors), but also more flexible, preventing breakage and falling off. While reducing overall thickness, it also reduces overall costs.

[0028] In summary, the backlit keyboard device of the present invention does not need to set diodes to avoid the generation of ghost keys, and can indeed achieve the purpose of the present invention.

[0029] However, the above description is merely an embodiment of the present invention and should not be used to limit the scope of the present invention. That is, any simple equivalent changes and modifications made according to the claims and description of the present invention still fall within the scope of the present invention.

Claims

1. A backlit keyboard device, characterized in that: The backlit keyboard device includes a light-emitting unit and a thin film circuit unit, the light-emitting unit includes at least one light-emitting component, and a driving circuit electrically connected to the light-emitting component and used to drive the light-emitting component to emit light, the thin film circuit unit includes a substrate, a lower covering film layer arranged on the top side of the substrate, a lower copper layer arranged on the top side of the lower covering film layer, a base material layer arranged on the top side of the lower copper layer, an upper copper layer arranged on the top side of the base material layer, an upper covering film layer arranged on the top side of the upper copper layer, a fixed adhesive layer arranged on the top side of the upper covering film layer, an upper circuit layer arranged on the top side of the fixed adhesive layer, and a plurality of inductive resistors arranged between the fixed adhesive layer and the upper circuit layer, the upper circuit layer, the fixed adhesive layer and the upper covering film layer jointly define at least one receiving groove for accommodating the light-emitting component.

2. The backlit keyboard device according to claim 1, wherein: Each sensing resistor is composed of at least one printed resistor, and the material of the printed resistor is carbon ink.

3. The backlit keyboard device according to claim 1, wherein: The thin film circuit unit also includes an anisotropic conductive film. The upper covering film layer defines a plurality of first window areas for the anisotropic conductive film to enter, and the fixing adhesive layer defines a plurality of second window areas for the anisotropic conductive film to enter. The anisotropic conductive film is able to pass through the first window areas and the second window areas in the up and down directions to conduct the upper copper layer and the upper circuit layer.

4. The backlit keyboard device according to claim 1, wherein: The upper circuit layer comprises a thin film portion and a circuit portion laid on the bottom side of the thin film portion. The circuit portion and the sensing resistor are laid together on the bottom side of the thin film portion.

5. The backlit keyboard device according to claim 1, wherein: The driving circuit is composed of the lower copper layer and the upper copper layer.

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