JPH0618883A - Back light device of coordinate input electronic apparatus - Google Patents

Abstract

PURPOSE:To enhance portability of the coordinate input electronic apparatus, to switch it a reflection type and a transmission type in accordance with brightness of the peripheral environment and a use time of a battery, and to clearly execute the display. CONSTITUTION:With respect to the lower case 5 of a pan input electronic apparatus A for containing a display device in which a digitizer 1 is provided of the surface, and a liquid crystal plate 3, and a semitransmission plate 4 are installed on its reverse side, and its back, respectively, a window hole 6 is formed in the back park of the liquid crystal plate 3, and to this window hole 6, a light shielding plate 7 for allowing it to be subjected to light shielding is attached so as to be attachable and detachable, and a light source window 9 of a back light box B being a light source to the liquid crystal plate 3 is allowed to coincide with the window hole 6 so that the pen input electronic apparatus A can be placed thereon.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight device for coordinate input electronic equipment. For example, a liquid crystal plate is installed on the back side of a transparent digitizer in which vertical and horizontal rules are drawn, and the light rays of this liquid crystal plate pass through. The present invention relates to a backlight device of a coordinate input electronic device that displays an input status of a pen or the like operated on a digitizer by non-passing.

[0002]

2. Description of the Related Art In a conventional coordinate input electronic device, in order to enhance its portability, a display device using a liquid crystal plate is provided on the back surface of a digitizer that serves as an index of a pen position. Either a reflective type that reflects the light rays that have passed through the liquid crystal and displays the light with or without passing through the liquid crystal, and a transmissive type that irradiates the light rays from the back surface of the liquid crystal and performs display by the action of the same liquid crystal. Was used.

[0003]

However, in the above-mentioned conventional example, when the reflection type liquid crystal is used,
When the surrounding environment is bright, more light rays pass through the liquid crystal and are reflected, and the display by the liquid crystal is clear, but when the surrounding environment becomes dark, there is less reflection and the display becomes difficult to see. There is.

In the case of the transmissive type, when the brightness of the surrounding environment is darker than the brightness of the light source, the display is clear, but when it becomes brighter than that, the brightness of the environment is lost. However, there is a drawback that the display becomes invisible.

In addition, in the case of the transmissive type, there is a limit to thinning due to the thickness of the light source such as a fluorescent lamp installed on the back surface of the liquid crystal, and not only the coordinate input electronic device becomes thick, but also When the battery is used as a power source due to the power consumption as the light source, there is a drawback that the battery usage time is shortened.

The present invention has been made in view of the above problems in the conventional coordinate input electronic device, and by making the backlight detachable from the coordinate input electronic device,
The objective is to make the display clear by removing the backlight when carrying and improving its portability, and switching between reflective and transmissive types according to the brightness of the surrounding environment and the battery usage time. .

Further, by tilting the rear side of the digitizer to a high angle, it is easy to perform input, and furthermore, a backlight device is provided in the expansion box so that when the expansion box is set, a transmissive liquid crystal can be used. An object is to provide a backlight device for an input electronic device.

[0008]

The present invention according to claim 1 relates to means for a backlight box of an electronic device, wherein a digitizer is provided on the front side and a liquid crystal plate is provided on the back side of the digitizer and at the back side of the liquid crystal plate. A coordinate input electronic device having a case that accommodates a display unit provided with a semi-transmissive plate and has a window hole formed on the back side of the liquid crystal plate, and a light-shielding plate that shields the window hole of the case and is detachably attached to the case. Equipment and
A backlight box which can mount the coordinate input electronic device, has a light source window facing the window hole, and accommodates a light source for the liquid crystal plate.

Further, in the backlight device of the coordinate input electronic device according to claim 2, a case of an inverter unit of a fluorescent lamp as a light source is rotatably attached to the rear side of the backlight box. And claim 3
In the invention described above, it is desirable that an expansion box on which a case accommodating the display device is mounted is provided with the light source window, a fluorescent lamp on the back surface thereof, and an inverter section thereof.

[0010]

In the backlight device of the coordinate input electronic device according to the present invention, the window hole on the bottom surface of the case is closed by the light shielding plate to block the incidence of the light beam from the window hole on the bottom surface, so that the semi-transmissive plate can be used. By reflecting light rays, it can be used as a reflective liquid crystal,
Further, by removing the light-shielding plate from the window hole and mounting the coordinate input electronic device with the window hole facing the light source window of the backlight box, it can be used as a transmissive liquid crystal, so that it can be used in any light or dark place. The liquid crystal display is clearly visible.

Further, by rotating the case of the inverter unit of the fluorescent lamp with respect to the backlight device, the rear side of the backlight box is raised and the coordinate input electronic device is tilted to facilitate pen input. be able to.

Further, by accommodating the light source window, the fluorescent lamp, and the inverter unit in the expansion box for expanding the function of the coordinate input electronic device, the function of the coordinate input electronic device is expanded at the same time.
As a transmissive liquid crystal, it can be used on a desk.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 are views showing an embodiment of a backlight device of a coordinate input electronic device according to claim 1 of the present invention. First, the configuration will be described. 1 and 2, A is a pen input electronic device which is a coordinate input electronic device, and 100
Is a backlight structure of the pen input electronic device A. The case of this pen input electronic device A is an upper case 2 provided with a transparent digitizer 1 in which vertical and horizontal rules are drawn.
And a lower case 5 for accommodating the liquid crystal plate 3 and the semi-transmissive plate 4 which passes about half of the incident light and reflects the rest between the upper case 2 and the upper case 2.

A window hole 6 is formed in the lower case 5 on the rear surface side of the liquid crystal plate 3, a step portion 6a having an inner surface recessed on the negative side of the window hole 6 and a small hole 6b on the opposite side. It is provided. Further, the lower case 5 is provided with the same shape as the window hole 6 such that, for example, a black light shield plate 7 that does not allow light rays to pass therethrough can be attached. The light shielding plate 7 is provided with a protruding step portion 7a which can be inserted into the upper portion of the step portion 6a and an engaging step portion 7b which can be inserted into the small hole 6b and has an upper end thereof.

Therefore, after inserting the protruding step portion 7a of the light shielding plate 7 into the step portion 6a of the window hole 6, the engaging step portion 7b is formed into the small hole 6b.
And the engaging stepped portion 7b is locked to the upper surface of the small hole 6b, the light shielding plate 7 is attached to the window hole 6 so as to close the window hole 6, and the light shielding of the window hole 6 is performed. Be seen.

In this way, when the window hole 6 is closed by the light shielding plate 7, the light beam from above the digitizer 2 passes through the digitizer 2 and the liquid crystal plate 3 and reaches the semi-transmissive plate 4. ,
The semi-transmissive plate 4 reflects about half of the light rays incident on the semi-transmissive plate 4. Therefore, when the reflected light passes through the liquid crystal plate 3 and the digitizer 2, the reflected light of the light beams of the voltage application portion and the non-application portion of the liquid crystal plate 3 is reflected. Characters, figures, etc. can be displayed by blocking and passing.

When the pen input electronic device A is placed on the upper case 8 forming the case of the backlight box B on which the pen input electronic device A can be placed,
A light source window 9 is opened at a position corresponding to the window hole 6, and a light guide plate 10 described later is housed between the upper case 7 and the lower case 11.

The light-shielding plate 10 has sawtooth-shaped uneven lines formed on the back surface thereof, and a metal film for reflecting light rays is formed on the uneven lines by means such as plating or vapor deposition to form the uneven lines. Light rays incident from the side surface side of the light guide plate 10 in the perpendicular direction are reflected toward the surface opposite to the uneven streaks.

In the backlight box B, a fluorescent lamp 12 is installed at a position perpendicular to the concave-convex streaks of the light guide plate 10 and reflecting light rays toward the opposite surface thereof.
An inverter unit 13 for supplying alternating current to the fluorescent lamp 12 is housed.

Therefore, if the light-shielding plate 7 that has closed the window hole 6 of the pen input electronic device A is removed and placed on the backlight box B and the fluorescent lamp 12 is turned on, the light beam is emitted from the light source window. 9 to the semi-transmissive plate 5, about half of which is reflected, but the rest passes toward the liquid crystal plate 3, and in the liquid crystal plate 3, in the same manner as described above, there are a light passing portion and a non-passing portion. Depending on the situation, characters, figures, etc. are displayed.

As described above, according to the present invention, depending on the ambient brightness, it can be used as either a reflection type or a transmission type, and when it is used as a reflection type, a pen input electronic device A using a battery as a power source. The wear rate can be reduced, and the backlight box can be removed to enhance portability.

FIG. 4 and FIG. 5 show an embodiment of the present invention as set forth in claim 2. In this embodiment, the backlight box B is divided into a backlight case B1 accommodating the fluorescent lamp 12 and the light guide plate 10 shown in FIG. 1 and an inverter case B2 accommodating the inverter unit 13, The light case B1 and the inverter case B2 are rotatably connected by a hinge 14.

By rotating the inverter case B2 as shown in FIG. 5 and arranging the inverter case B2 on the lower rear side of the backlight case B1, the pen input electronic device A mounted on the backlight case B1 will be described. The surface of the digitizer 1 can be tilted, which facilitates pen input operation.

FIG. 6 shows an embodiment of the present invention as set forth in claim 3. In this embodiment, the pen input electronic device A is placed,
The backlight box B is also used as the extension box C connected to this and expanding its function. In this embodiment, similarly to the first embodiment, the light source window 9 is provided at a position corresponding to the window hole 6 of the pen input electronic device A mounted thereon.
The light guide plate 10 is provided on the back surface thereof, the fluorescent lamp 12 is installed on the side surface of the light guide plate 10, and the inverter section 13 is housed.

With this structure, if the pen input electronic device A is placed on the expansion box C, the fluorescent lamp 1
2 can be used on a desk as a pen-type electronic device A of a transmissive liquid crystal display with the light source as an expansion box C.
The function extensibility of can be effectively used.

[0026]

As described above, according to the present invention of claim 1, depending on the ambient brightness, it can be used as either a reflection type or a transmission type, and when it is used as a reflection type. In a coordinate input electronic device that uses a battery as a power source, the wear rate can be reduced, and when the battery is used for a long period of time, the purpose can be achieved by using the reflective type, and the backlight box can be used. Can be removed to enhance its portability.

According to the second aspect of the invention, the backlight case is divided into a backlight case containing the backlight and the light guide plate, and a rotatable inverter case containing the inverter section. Can be rotated and placed under the back of the backlight case to tilt the digitizer of the coordinate input electronic device,
It is possible to facilitate input by pen operation.

According to the third aspect of the invention, the expansion box for expanding the function of the coordinate input electronic device can be used as a backlight box, and the expansion of this function and the transmission type liquid crystal display The pen input electronic device having good visibility and extended functions can be made suitable for use on a desk.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a transmissive liquid crystal display according to an embodiment of the present invention as set forth in claim 1.

FIG. 2 is a cross-sectional view of the reflective liquid crystal display of the embodiment shown in FIG.

FIG. 3 is a perspective view showing a separated state of the embodiment shown in FIG.

FIG. 4 is a perspective view of an embodiment of the present invention as set forth in claim 2;

5 is a perspective view of the inverter case shown in FIG. 4 when the inverter case is rotated.

FIG. 6 is a perspective view showing a separated state of an embodiment of the present invention according to claim 3;

[Explanation of symbols]

 A Pen input electronic device B Backlight box B1 Backlight case B2 Inverter case C Expansion box 1 Digitizer 3 Liquid crystal plate 5 Lower case 6 Window hole 7 Light shield 9 Light source window 10 Light guide plate 12 Fluorescent lamp 13 Inverter section

Claims (3)

[Claims] 1. A display unit having a digitizer on the front side, a liquid crystal plate provided on the back side of the digitizer, and a semi-transmissive plate on the back side of the liquid crystal plate, and a window hole is formed on the back side of the liquid crystal plate. And a coordinate input electronic device having a light shielding plate detachably attached to the case for shielding the window hole of the case, and the coordinate input electronic device can be mounted and a light source window facing the window hole. A backlight device for a coordinate input electronic device, comprising: a backlight box having a light source for the liquid crystal plate. 2. The backlight device for coordinate input electronic equipment according to claim 1, wherein a case of an inverter unit of a fluorescent lamp serving as a light source is rotatably attached to the rear side of the backlight box. 3. The coordinates according to claim 1, wherein the light source window, the fluorescent lamp on the rear surface thereof, and the inverter portion thereof are provided in an expansion box on which a case accommodating the display unit is placed. Backlight device for input electronics.