KR20070014907A - Device condensing light for mobile phone - Google Patents

Abstract

A device for condensing light in a portable terminal is provided to enable a user to easily read an LCD even in a light place by increasing lightness of the LCD of the portable terminal in proportion to peripheral lightness, and prevent waste of power by using light collected from the sunlight or an indoor light without using special power, thereby increasing power efficiency. A portable terminal comprises the followings: an LCD(Liquid Crystal Display)(123); and a light guide panel(125) for guiding light, emitted from an LED(Luminescent Diode)(124), to the LCD(123) so that the LCD(123) can be readable even in a dark place. The portable terminal includes a light condensing unit collecting external light in a light place, and additionally supplying the collected light to the LCD(123) to increase the illuminance of the LCD(123). The light condensing unit includes a light condensing lens(126) installed in a point adjacent to the LCD(123).

Description

Condensing device for mobile terminal {DEVICE CONDENSING LIGHT FOR MOBILE PHONE}

1 is a perspective view showing the configuration of a portable terminal according to the prior art;

2 is a partial cross-sectional view taken along the line AA ′ of FIG. 1.

Figure 3 is a perspective view showing the configuration of a portable terminal equipped with a light collecting device according to an embodiment of the present invention.

4 and 5 are exploded perspective views showing the configuration and operation of the LCD provided in the portable terminal of FIG.

  4 is a state in which power is supplied to the LCD.

  5 is a state that power is not supplied to the LCD.

6 is a partial cross-sectional view taken along the line AA ′ of FIG. 3.

7 is a partial cross-sectional view showing the configuration of a light collecting device according to another embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

110: terminal body 111: input unit

112: battery 120: folder

121: LCD part 123: LCD (LCD)

124: LED 125: light guide plate

126: condenser lens 127: reflective prism

128: unidirectional transmissive film 129: diffuser plate

130: reflector

The present invention relates to a light collecting device of a portable terminal, and more particularly, by increasing the brightness of LCD of the portable terminal in proportion to the brightness of the surroundings, the user can easily read the LCD even in a bright place, and separately The present invention relates to a light collecting device of a portable terminal capable of preventing power waste and increasing power efficiency by increasing brightness of an LCD by using light collected from sunlight or an indoor light without using a power source.

In general, a mobile terminal is a wireless mobile communication device that can be used indoors or outdoors by the user as well as on the go. The functions previously limited to transmitting and receiving voices perform various functions such as playing games, listening to MP3s, watching the Internet, and watching TV. Is developing into a device.

In particular, with the recent rapid development of digital media technology, digital media broadcasting (DMB) or movies using a portable terminal have been reached, or even a game of high resolution.

Accordingly, not only is it necessary to increase the size of the LCD provided in the mobile terminal, but it is necessary for the user to see the LCD without any inconvenience regardless of day and night.

LCD (Liquid Crystal Display) refers to an electronic device that transmits various electrical information generated by various devices to visual information by using a change in the transmittance of liquid crystals according to an applied voltage. In order to input the number without mistake, install LED with constant illuminance on the back of LCD to supply light toward the front of LCD to play a role of lighting.

LED (Lumescent Diode) refers to a light emitting device that produces a minority carrier (electron or hole) injected using a pn junction structure of a semiconductor, and emits light energy generated when they are recombined. It is a device that is widely used recently to emit a relatively high energy as power.

Hereinafter, a portable terminal according to the prior art will be described with reference to the accompanying drawings.

1 is a perspective view illustrating a structure of a mobile terminal according to the prior art, and FIG. 2 is a partial cross-sectional view taken along the line AA ′ of FIG. 1.

As shown in FIG. 1, the portable terminal 1 according to the related art includes a terminal body 10 and a folder portion 20 hinged to an upper end of the terminal body 10.

The terminal body 10 includes an input unit 11 formed on the front surface of the terminal body 10 to input a number or move a menu, and a battery 12 detachably coupled to the rear surface of the terminal body 10. In addition, a circuit board (not shown) is built in the terminal body 10 to electrically operate the portable terminal 1.

The folder portion 20 is formed on the front of the folder portion 20, the LCD portion 21 for displaying information by the electrical action of the circuit board, and the speaker 22 formed on the LCD portion 21 It consists of.

Here, as shown in FIG. 2, the LCD unit 21 is exposed to the front of the folder unit 20 and displays information on the LCD 23, and the lower end of the LCD unit 21 is provided with a predetermined illuminance. LED (24) for emitting the light, and is attached to the back of the LCD (23) and a light guide panel (Light Guide Panel) (25) for guiding the light emitted from the LED (24) to the LCD (23).

Referring to the principle of operation of the portable terminal 1 according to the prior art configured as described above is as follows.

When the user wants to display the information on the LCD 23 in a dark place, when the user presses the button of the input unit 11, the circuit board is electrically operated by the input of the button to transmit the information signal to the LCD 23. .

Then, the number 23 or letter input by the user is displayed on the LCD 23. At this time, electricity is supplied to the LED 24, and light energy is emitted from the LED 24, and the light proceeds to the light guide plate 25. The light guide plate 25 guides the light emitted from the LED 24 to the LCD 23 so that light is emitted through the front surface of the LCD 23.

Therefore, the user can clearly read the information displayed on the LCD 23 by utilizing the light emitted through the front of the LCD 23 as an illumination.

However, since the portable terminal 1 according to the related art utilizes the light emitted from the LED 24 as the illumination of the LCD 23, it is an effective lighting means in a dark place, for example, at night or in a room where the lights are turned off. However, in a bright place, i.e., in a room where the day or the fire is bright, the luminance of the light emitted from the LED 24 is relatively lower than that of the outside, so that the readability of the LCD 23 is remarkably high. There was a problem falling.

In order to solve this, there is an effort to increase the power supplied to the LED 24 to brighten the intensity of the light emitted from the LED 24, but this causes power consumption and due to the heat emitted from the LED 24 There was a problem that the terminal 1 is easily heated to inconvenience the user or shorten the life of the portable terminal 1.

The present invention has been made to solve the problems described above, by increasing the brightness of the LCD (LCD) of the mobile terminal in proportion to the brightness of the surroundings, the user can easily read the LCD even in a bright place, separate It is an object of the present invention to provide a light collecting device of a portable terminal capable of preventing power waste and increasing power efficiency by increasing the brightness of an LCD by using light collected from sunlight or indoor light without using a power source.

In particular, an object of the present invention is to provide a light collecting device of a portable terminal, which can minimize power waste by providing a unidirectional transmissive film to prevent the light energy emitted from the LED from being lost to other parts than the LCD of the portable terminal.

In order to achieve the above object, the present invention provides a light emitting device comprising a LCD and a light guide plate for guiding the light emitted from the LED to the LCD so that the LCD can be read even in a dark place. A condensing instrument that collects external light from there and supplies additional collected light to the LCD to increase the illuminance of the LCD; Provided is a light collecting device of a portable terminal, which includes.

It is provided with a light collecting mechanism, which overcomes the disadvantages of the conventional portable terminal in which the readability of the LCD is significantly reduced in the bright place, and collects the light of the bright place to use as the illumination of the LCD, the brighter the outside light is collected This is to increase the illuminance of the LCD in proportion to the brightness of the external light because the intensity of the light is increased.

Here, the condensing mechanism is composed of a condensing lens provided at an adjacent point of the LCD, thereby collecting external light and supplying it to the LCD. In this case, the condenser lens is attached to the same surface to which the LCD is attached, and includes a reflecting prism that reflects the light collected by the condenser lens in the LCD direction, thereby minimizing spatial constraints for installing the condenser lens. can do. That is, no matter where the condenser lens is disposed, the same purpose can be achieved by using only a reflective prism or a mirror to send the collected light only in the LCD direction, thereby eliminating restrictions on the installation position of the condenser lens.

In this case, the light emitted from the LED may be attached by a unidirectional transmissive film attached between the reflective prism and the light guide plate to transmit light from the reflective prism toward the light guide plate and to reflect light from the light guide plate to the reflective prism direction. The loss to other parts except for the LCD of the portable terminal can be minimized. That is, by removing the concern that the light emitted from the LED may be emitted to the outside through the condensing lens rather than the LCD, all the light is focused in the direction of the LCD.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation principle of the light collecting device of the portable terminal according to an embodiment of the present invention.

However, in describing the present invention, description of already known functions or configurations will be omitted to clarify the gist of the present invention.

3 is a perspective view illustrating a configuration of a portable terminal having a light collecting device according to an embodiment of the present invention, and FIGS. 4 and 5 are exploded perspective views illustrating a configuration and an operation of an LCD provided in the portable terminal of FIG. 3. As shown in FIG. 4, power is supplied to the LCD, FIG. 5 is not supplied to the LCD, FIG. 6 is a partial cross-sectional view taken along the line AA ′ of FIG. 3, and FIG. 7 is another embodiment of the present invention. It is a partial sectional view which shows the structure of the light concentrating device which concerns on an Example.

As shown in FIG. 3, the portable terminal 100 including the light concentrating device according to an embodiment of the present invention includes a terminal body 110 and a folder unit 120 hinged to an upper end of the terminal body 110. It is composed of

The terminal body 110 may include an input unit 111 formed on the front surface of the terminal body 110 to input a number or move a menu, and a battery 112 detachably coupled to a rear surface of the terminal body 110. The circuit board (not shown) is built in the terminal body 110 to electrically operate the portable terminal 100.

The folder unit 120 is formed on the front surface of the folder unit 120 to display the information by the electrical action of the circuit board 121 and the speaker 122 formed on the LCD unit 121 It consists of.

Here, as shown in FIG. 6, the LCD unit 121 is exposed to the front surface of the folder unit 120 to display information, and an LCD 123 is provided at the lower end of the LCD unit 121 to provide a constant illuminance. LED 124 for emitting the light of the light guide panel (125) attached to the back of the LCD 123, and guides the light emitted from the LED 124 to the LCD 123, and the LCD (123) The light collecting lens 126 is installed to surround the outer surface of the light emitting device and collects external light, and is attached to the rear surface of the light collecting lens 126 to reflect the light collected by the light collecting lens 126 toward the LCD 123. It consists of a reflective prism 127 and a unidirectional transmissive film 128 attached to the lower surface of the reflective prism 127.

As shown in FIGS. 4 and 5, the LCD 123 generally includes a liquid crystal element 123a and an alignment plate 123b stacked up and down the liquid crystal element 123a to twist light. The polarizing plate 123c is laminated on the outer side of each alignment plate 123b to polarize light and is disposed in a direction perpendicular to each other.

As illustrated in FIGS. 6 and 7, the light guide plate 125 is generally made of a transparent acrylic resin, and thus has high strength, light weight, and high visible light transmittance, so that light emitted from the LED 124 can be obtained. Or it serves to guide the light collected through the condenser lens 126 toward the LCD 123.

The condensing lens 126 illustrated in FIGS. 6 and 7 may be installed on the outer surface of the folder part 120 so that the front of the lens faces outward, and preferably, the folder part in which the LCD 123 is installed. Installed on the front of the 120 and the front of the lens is preferably configured to face the same direction as the front of the LCD 123. This is because when the user views the LCD 123, the darker the periphery of the LCD 123, the better the readability of the LCD 123. That is, since the luminance of the LCD 123 is higher than that of the surroundings, the LCD 123 has better readability. Therefore, the LCD 123 collects light in the vicinity of the LCD 123, and thus the LCD has a relatively high luminance. (123) The amount of light is reduced in the vicinity, the illuminance is lowered.

In this case, spatial constraints on the installation of the condenser lens 126 can be solved by providing the reflective prism 127. That is, the reflective prism 127 or the mirror may be appropriately used in any case, such as when the condenser lens 126 is installed on the outermost surface of the folder portion 120 or when the condensing lens 126 is installed to surround the outer surface of the LCD 123. The object of the present invention can be achieved by simply transmitting the light collected by the condenser lens 126 toward the LCD 123.

As shown in FIGS. 6 and 7, the unidirectional transmissive film 128 transmits light from the reflective prism 127 toward the light guide plate 125 as it is, but passes the reflective prism 127 from the light guide plate 125. The directing light serves to prevent reflection and transmission. Generally, a metal reflective film is coated on the surface to be reflected. Therefore, the light emitted from the LED 124 is emitted through the light guide plate 125 to the outside of the condenser lens 126 through the reflective prism 127 to prevent the light from being lost.

Referring to the operation principle of the light collecting device of the portable terminal 1 according to an embodiment of the present invention configured as described above are as follows.

When the user wants to display information on the LCD 123 of the mobile terminal 1 in a dark place, when the button of the input unit 111 is pressed, the circuit board is electrically operated by the input of the button to the LCD 123. It will supply power.

As shown in FIG. 5, in the state in which the power is not supplied to the LCD 123, since the liquid crystal elements 123a are arranged in a line, the light is not bent and is blocked by the mutually orthogonal polarizing plates 123c. Light will not reach your eyes. Accordingly, no information is displayed on the LCD 123, and the black color remains.

Then, when power is supplied to the LCD 123, as shown in FIG. 4, the liquid crystal elements 123a are arranged in a specific arrangement by electric signals, and light is bent along the array to penetrate the upper and lower polarizers 123c. Light arrives in the eyes of the user so that the user can read the information displayed on the LCD 123.

However, since the information displayed on the LCD 123 cannot be clearly read in a dark place, the circuit board supplies power to the LED 124 in conjunction with the input of the button. Then, as shown in FIG. 6, the LED 124 emits light energy and the light guide plate 125 guides the light energy emitted by the LED 124 in the direction of the LCD 123, thereby causing the LCD 123. Light is emitted through the front of the.

Therefore, the user can read the information displayed on the LCD 123 by utilizing the light emitted through the front of the LCD 123 as an illumination.

On the other hand, when the user wants to display information on the LCD 123 of the mobile terminal 1 in a bright place, when the button of the input unit 111 is pressed, the circuit board is electrically operated by the input of the button. As shown, the information is displayed on the LCD 123 and power is supplied to the LED 124, and the LED 124 emits light energy so that the light guide plate 125 guides the light toward the LCD 123. Done.

In addition, the light collecting lens 126 installed along the outer surface of the LCD 123 collects (collects) external bright light, and the reflective prism 127 switches the direction of the collected light to the light guide plate 125. Will be sent. Then, the light guide plate 125 guides the light toward the LCD 123 to emit light through the front surface of the LCD 123.

Therefore, the user reads the information displayed on the LCD 123 by using not only the light emitted from the LED 124 but also the light collected through the condensing lens 126 as an illumination. Since the illuminance of the light emitted through the front surface of the 123 is relatively high, the user does not feel any inconvenience while reading the information displayed on the LCD 123.

That is, the conventional problem that the information displayed on the LCD 123 is difficult to read in a bright place is easily solved. Rather, the brighter the outside, the stronger the intensity of the light collected through the condensing lens 126 and the LED 124 in addition. Since the light emitted from the light is utilized for lighting, it is easy to read the information displayed on the LCD 123.

In addition, since the unidirectional transmissive film 128 is attached to the lower surface of the reflective prism 127, light collected through the condenser lens 126 is easily transmitted to the light guide plate 125, but is emitted from the LED 124. The reflected light can be prevented from being lost to the outside of the mobile terminal 1 by being reflected by the unidirectional transmissive film 125.

On the other hand, the light collecting device of the portable terminal according to another embodiment of the present invention is shown in FIG. As shown in the drawing, in the light collecting device according to another embodiment of the present invention, the diffusion plate 129 is disposed between the LCD 123 and the light guide plate 125, and the reflecting plate 130 is disposed on the rear surface of the light guide plate 125. It is installed.

The diffusion plate 129 serves to diffuse the light guided to the LCD 123 evenly through the light guide plate 125 evenly over the entire surface of the LCD 123. It reflects the light leaking in the rear direction of the 125) serves to send to the LCD 123.

As described above, according to the light converging device in which the diffuser plate 129 and the reflector plate 130 are additionally installed, the light guide plate 125 may be formed of light emitted from the LED 124 and light collected through the light condenser lens 126. Light leaking in the back direction is reflected by the reflecting plate 130 and sent to the diffusion plate 129.

The diffusion plate 129 evenly spreads the light transmitted from the light guide plate 130 over the entire surface of the LCD 123 to prevent the user's eyes from fatigue by brightening only a specific portion of the LCD 123.

In the above, the preferred embodiment of the present invention has been described by way of example, but the scope of the present invention is not limited to the specific embodiments as described above, and may be appropriately changed within the scope described in the claims. In addition, in the above embodiment, a folding type portable terminal is used as an example, but it is applicable to all kinds of portable terminals using LCD.

As described above, the user can easily read the LCD even in a bright place by increasing the brightness of the LCD of the portable terminal in proportion to the surrounding brightness, and also use the solar light without using a separate power source. In addition, the present invention provides a light collecting device of a portable terminal capable of preventing power waste and increasing power efficiency by using light collected from an indoor light.

Particularly, in order to prevent the light energy emitted from the LED from being lost to other parts besides the LCD of the portable terminal, the light concentrating device of the portable terminal can be minimized by providing a unidirectional transmissive film.

Claims (6)

A mobile terminal having an LCD and a light guide plate for guiding illumination emitted from an LED to the LCD so that the LCD can be read even in a dark place. A light concentrating device that collects external light in a bright place and further supplies collected light to the LCD to increase illuminance of the LCD; Condensing device of a mobile terminal, characterized in that comprising a. The method of claim 1, The condensing mechanism, And a condenser lens installed at an adjacent point of the LCD. The method of claim 1, The condensing mechanism, A condenser lens attached to the same surface to which the LCD is attached; A reflection prism for reflecting light collected by the condenser lens toward the LCD; Condensing device of a mobile terminal, characterized in that comprising a. The method of claim 3, And a unidirectional transmissive film attached between the reflective prism and the light guide plate to allow light to pass from the reflective prism toward the light guide plate and to reflect light from the light guide plate to the reflective prism direction. A light collecting device for a portable terminal. The method according to any one of claims 1 to 4, And a diffuser plate disposed between the LCD and the light guide plate to diffuse light guided from the light guide plate to all parts of the LCD. The method according to any one of claims 1 to 4, And a reflector disposed on a rear surface of the light guide plate to reflect light emitted from the rear surface of the light guide plate in the direction of the LCD attached to the front surface of the light guide plate.

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