JP4043981B2 - mobile phone - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a backlight structure that enables individual emission colors in various electronic devices, a mobile phone using the backlight structure, and a keypad for the mobile phone.
[0002]
[Prior art]
FIG. 2 shows the appearance of a general mobile phone 1. In such a cellular phone 1, the numeric keypad 1a and the liquid crystal screen 1b provided on the cellular phone main body 11 emit light when in use.
[0003]
The backlight structures of the numeric keypad 1a and the liquid crystal screen 1b are configured as shown in FIG. That is, the numeric keypad 1a is provided with an LED 3a on a printed circuit board 2 provided inside the mobile phone body 11, and the light of the LED 3a is transmitted through each keypad 4 constituting the numeric keypad 1a to emit light. It was made. In addition, the liquid crystal screen unit 1 b is configured such that the liquid crystal cell 5 is provided on the printed circuit board 2 via the backlight light guide plate 51, and the light of the LED 50 provided at a position adjacent to the backlight light guide plate 51 is reflected by the backlight light guide plate. It was made to emit light through 51.
[0004]
Conventionally, in such a backlight structure, the LED 3a has been a normal visible light chip.
[0005]
[Problems to be solved by the invention]
However, when the visible light chip LED 3a is used as in the conventional case, only a normal and familiar light emission color tone can be expressed. Therefore, when it is configured to emit light different from the normal one, the LED 3a provided on the printed circuit board 2 must be replaced, which requires some electronic component soldering techniques, and the work is difficult. turn into.
[0006]
The present invention was made in view of the circumstances of, and its object is to provide a mobile phone of the backlight structure as possible out to the emission color of choice.
[0007]
[Means for Solving the Problems]
A mobile phone according to the present invention for solving the above-described problem is a backlight in which an LED is provided on a printed circuit board inside a casing having a light guide plate, and light from the LED is transmitted through the light guide plate. It is a folded cell phone with a structure , and a key backlight is constituted by each LED corresponding to each key of the keypad, and the hinge part of the cell phone is made of a transparent resin, and this hinge part and the keypad are The light of the key backlight is guided to the hinge portion, and an LED having a light emission wavelength of 400 nm or more is used. Except for this LED and the printed board, the light of the LED is guided to the light guide plate. A wavelength conversion type phosphor that is excited by the light of the LED and emits light is provided in the light guide path from the light transmitting to the light emitting.
[0008]
In the mobile phone , an LED having an emission wavelength of 400 to 430 nm may be used. The wavelength conversion type phosphor may be mixed so as to be dispersed in the light guide plate, or may be applied to the light guide plate. Further, in the mobile phone , a color tone conversion sheet mixed with a wavelength conversion type phosphor may be provided in the light guide path. The light guide path should just be in the path | route until the light of LED permeate | transmits a light guide plate and can be visually recognized as light emission from the outer side of a casing. For example, the color tone conversion sheet may be interposed between the LED and the light guide plate, or may be attached to the back surface or the surface of the light guide plate.
[0009]
According to this cellular phone , light from an LED having an emission wavelength of 400 nm or more is emitted through the light guide plate. At this time, part of the light becomes light of another color that has been wavelength-converted by hitting the wavelength-converting phosphor. As a result, light emission of a color tone in which the two kinds of light are mixed can be obtained. When a plurality of types of wavelength-converting phosphors are used, the wavelength-converted light has a plurality of colors, so that the color tone of light emission can be expressed even more complicatedly. However, if the amount of the wavelength conversion phosphor used is increased too much, the light of the LED having an emission wavelength of 400 nm or more that is transmitted through the light guide plate is absorbed by the wavelength conversion phosphor and is converted into another color. Since the amount of light increases and the energy efficiency of light decreases, the use of the wavelength conversion phosphor must be considered so that the emitted light does not become dark.
[0010]
The wavelength-converting phosphor is provided in the light guide path until the light from the LED passes through the light guide plate and emits light. Therefore, after changing the emission color, the emission color is further changed. When an attempt is made to change, it is not necessary to perform complicated soldering work such as removing the LED from the printed board and changing it to another LED, and the change can be made with a simple operation.
[0011]
The mobile phone, the type of wavelength converting phosphor to use, so that the keypad can be made to emit light to a desired color tone.
[0012]
In addition, the mobile phone is configured with a transparent resin that functions as a light guide plate at the hinge portion of the folded mobile phone, and the key backlight is guided to the transparent resin portion that functions as the light guide plate . , the type of wavelength converting phosphor to be used hinge component, it becomes possible to emit light to a desired color tone.
[0013]
In the case of these mobile phones, each key of the keypad may emit light in different colors depending on the type and amount of wavelength-converting phosphor used in each part, and the keypad and the hinge part are different from each other. The light may be emitted in different colors.
[0014]
Furthermore, the cellular phone is set with a wavelength conversion type phosphor paint that emits light when excited by the light of the key backlight, and this wavelength conversion type phosphor paint is applied to the keypad according to the user's preference. It may be a thing. In this case, since the color tone of the light emission varies depending on the amount of the wavelength conversion type phosphor coating applied, that is, the amount of dispersion of the wavelength conversion type phosphor, the color tone of the light emission according to the preference can be obtained.
[0015]
However, if the application amount of the wavelength conversion type phosphor coating material is wrong, it is impossible to emit light in a desired color tone. Therefore, when an LED having a light emission wavelength of 400 to 430 nm is used as a key backlight in advance, a keypad in which a predetermined amount of wavelength conversion phosphor is mixed so as to emit light in a desired color tone may be prepared. In this case, it is possible to emit light in a desired color tone simply by replacing the keypad as a replacement part of the mobile phone.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0017]
FIG. 1 shows an internal structure of a mobile phone 1 using a backlight structure according to an embodiment of the present invention, and FIG. 2 shows an outline of the overall configuration of the mobile phone 1.
[0018]
In this cellular phone 1, a blue-violet chip LED 3 having an emission wavelength of 400 to 430 nm is provided on a printed circuit board 2 inside the cellular phone body 11, and the light from the blue-violet chip LED 3 is applied to a wavelength conversion phosphor 10. Light is emitted through the pad 4.
[0019]
On the printed circuit board 2, blue-violet chip LEDs 3 are provided at positions corresponding to the keys of the keypad 4 to form the numeric keypad 1 a of the mobile phone 1. Further, the liquid crystal cell 5 is provided through the backlight light guide plate 51 to form the liquid crystal screen portion 1 b of the mobile phone 1. On the surface of the printed circuit board 2 adjacent to the backlight light guide plate 51, a liquid crystal backlight illumination LED 50 is provided for transmitting the backlight light guide plate 51 and causing the entire liquid crystal cell 5 to emit light.
[0020]
As the blue-violet chip LED 3, one having an emission wavelength of 400 to 430 nm is used.
[0021]
When the emission wavelength is smaller than 400 nm, the human body is adversely affected, and particularly the eyes are damaged by ultraviolet light. Therefore, when considering safety and health, the emission wavelength must be visible light of 400 nm or more.
[0022]
Even when the emission wavelength is larger than 430 nm, it can be used. However, when the emission wavelength is shorter than 430 nm, the energy of light is large and the external efficiency is high. Therefore, in consideration of keeping the running cost low with low power, the emission wavelength is preferably 430 nm or less.
[0023]
The keypad 4 is made of a transparent resin having translucency such as silicon resin, polycarbonate resin, and acrylic resin. The keypad 4 is coated with the wavelength conversion phosphor 10 on the back surface facing the blue-violet chip LED 3. In this way, by applying the wavelength conversion phosphor 10 on the back surface of the keypad 4 instead of the blue-violet chip LED 3, the blue-violet chip LED 3 is removed from the printed circuit board 2 in the event that it is desired to change the color tone of the emission color. A complicated soldering operation for detaching is not performed, and it can be dealt with by simply replacing the keypad 4.
[0024]
The wavelength conversion phosphor 10 is not particularly limited as long as it is excited by the light of the blue-violet chip LED 3 and emits light, and may be only one type, or two or more types. It may be used in combination. This wavelength conversion phosphor 10 is a combination ratio of the emission wavelength of the blue-violet chip LED 3, that is, the emission wavelength of 400 to 430 nm, and the emission wavelength of the wavelength conversion phosphor 10 that emits light when excited by the light of the blue-violet chip LED 3. It can be converted into visible light from purple to red. The color tone of the luminescent color can create a desired color shade depending on the combination of the wavelength conversion phosphor 10 and the application condition. When two or more types of wavelength-converting phosphors 10 are applied, they may be overcoated, or each wavelength-converting phosphor 10 may be applied separately to a different part to have a pattern or design.
[0025]
The wavelength converting phosphor 10 is applied to the back surface of the keypad 4 as long as it is in the light guide path from the blue-violet chip LED 3 through the keypad 4 to the outside of the mobile phone body 11. It is not limited and may be applied to the surface of the keypad 4. However, in this case, since there is a concern that the wavelength conversion phosphor 10 may be peeled off over time due to the operation of the keypad 4, the keypad 4 comb is a protective film layer (not shown) on the entire surface of the mobile phone body 11. ) Is preferably provided.
[0026]
Further, when the keypad 4 is molded, the keypad 4 may be molded so that the wavelength conversion phosphor 10 is dispersed inside. In this case, if the keypad 4 in which the dispersion degree of the wavelength conversion phosphor 10 is adjusted so as to match the desired color tone is prepared as a replacement part of the mobile phone 1, the user adjusts the hue by application. Without changing the keypad 4, it is possible to change the light emission color to a desired one.
[0027]
Further, a film-like material in which the wavelength conversion phosphor 10 is dispersed may be interposed between the blue-violet chip LED 3 and the keypad 4 or may be pasted on the surface of the keypad 4. . In this case, even if the keypad 4 is not exchanged, it can be changed to a desired emission color by attaching or removing the film. In particular, when a film is pasted on the surface of the keypad 4, it can be easily performed without the need to open the mobile phone body 11 and take out the keypad 4.
[0028]
In the present embodiment, the mobile phone 1 is configured to change the emission color of the keypad 4, but the liquid crystal backlight LED 50 is changed to the blue-violet chip LED 3 described above to change the color of the liquid crystal screen 1b. You may comprise so that a luminescent color may also be changed. However, in this case, if the wavelength conversion type phosphor 10 is applied to the backlight light guide plate 51, a soldering operation for removing the liquid crystal cell 5 and the backlight light guide plate 51 from the printed circuit board 2 is required when the emission color is changed. Therefore, the wavelength-converting phosphor 10 must be a film-like one in which the wavelength-converting phosphor 10 is dispersed and pasted on the surface of the liquid crystal screen portion 1b.
[0029]
Moreover, as shown in FIG. 3, the antenna part 13 and the hinge part 14 of the foldable mobile phone 12 may be made of a transparent resin having translucency so as to have a desired emission color. In this case, as the light source, the blue-violet chip LED 3 may be provided as a dedicated light source for the antenna unit 13 and the hinge unit 14, or the light from the blue-violet chip LED 3 for illuminating the keypad 4 may be used. Good. When diverting light from the blue-violet chip LED 3 for illumination of the keypad 4, the light guide path from the blue-violet chip LED 3 to the antenna unit 13 and the hinge unit 14 is arranged with electronic components so that light is not blocked as much as possible. Payment must be considered. Moreover, the antenna part 13 and the hinge part 14 may apply | coat the wavelength conversion type | mold fluorescent substance 10, and the wavelength conversion type | mold fluorescent substance 10 is put in the resin material which comprises these antenna part 13 and the hinge part 14. It may be dispersed, or may be a film in which the wavelength conversion phosphor 10 is dispersed, or may be interposed between the blue-violet chip LED 3. When the antenna unit 13 has a desired light emission color, the mobile phone 1 that is not a folding type as shown in FIG. 2 may be used.
[0030]
Further, in the present embodiment, the backlight structure of the mobile phone 1 is described, but such a backlight structure is used for various electric products that use LEDs as display light sources other than the mobile phone 1. You can also. In particular, in the case of a portable information terminal having a keypad 4 that is frequently used at the time of operation as in the present embodiment, the number of operations and the number of times of visual recognition are effective.
[0031]
【The invention's effect】
As described above, according to the present invention, it is possible to easily obtain desired light emission without performing soldering work for LED replacement or replacement of a printed circuit board. In addition, since an LED having an emission wavelength of 400 nm or more is used, it is possible to obtain safe and energy-efficient light emission.
[Brief description of the drawings]
1A is a cross-sectional view showing an outline of the internal structure of a mobile phone using a backlight structure according to the present invention, and FIG. 1B is a partially enlarged cross-sectional view of the same.
FIG. 2 is a perspective view showing an outline of the overall configuration of a mobile phone.
FIG. 3 is a perspective view showing a mobile phone according to another embodiment of the present invention.
4A is a cross-sectional view showing an outline of an internal structure of a mobile phone using a conventional backlight structure, and FIG. 4B is a partially enlarged cross-sectional view of the same.
[Explanation of symbols]
1 Cellular phone 10 Wavelength conversion type phosphor 2 Printed circuit board 3 Blue-violet chip LED
4 Keypad

Claims (5)

A bi-fold mobile phone with a backlight structure in which an LED is provided on a printed circuit board inside a casing having a light guide plate, and light of the LED is transmitted through the light guide plate to emit light,
A key backlight is constituted by each LED corresponding to each key of the keypad, and the hinge part of the mobile phone is made of a transparent resin, and this hinge part and the keypad serve as a light guide plate. Key backlight light is guided,
An LED having an emission wavelength of 400 nm or more is used, and except for the LED and the printed board, the LED light is excited by the light of the LED in the light guide path through the light guide plate to emit light. A mobile phone comprising a wavelength-converting phosphor that emits light. The mobile phone according to claim 1, wherein an LED having an emission wavelength of 400 to 430 nm is used. 3. The mobile phone according to claim 1, wherein the wavelength conversion type phosphor is mixed in the light guide plate. 3. The mobile phone according to claim 1, wherein the wavelength conversion phosphor is applied to a light guide plate. 3. The mobile phone according to claim 1, wherein a color tone conversion sheet mixed with a wavelength conversion type phosphor is provided in the light guide path.

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