JPH09160707A - Pen input information processor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the coordinate detection precision and also to simplify the structure of an information processor by putting an LCD device on a coordinate detection tablet device. SOLUTION: This processor includes an LCD device where a liquid crystal PCB(printed circuit board) 32 where the parts to be displayed and driven are mounted is connected to an LCD cell 30 via a folded TCP(tape carrier package) 34, and a coordinate detection tablet 26 on which the LCD device is put. The printed circuit board(PCB) 32 is placed on the back side of the tablet 26, and the tablet 26 is held between the cell 30 and the PCB 32.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pen input information processing device in which a display device and a coordinate detection tablet are arranged in an overlapping manner.

[0002]

2. Description of the Related Art Generally, in an information processing apparatus equipped with a pen as one of input means, an input device called a tablet or a digitizer is used to input pen point coordinates designated by the pen. Currently, there are various coordinate detection methods used for tablets. Typical methods are (1) resistive film method (or pressure sensitive method), (2) electromagnetic induction method, and (3) electrostatic method. There is a coupling method, which is generally put into practical use.

Each of the tablets using each method has its own characteristics. (2) In the electromagnetic induction method, the tablet is located below the display device (LCD device) and the display on the liquid crystal surface is obstructed by the tablet. It is a method that is often used for pen input information devices because it has no cord, the pen can be made cordless, and the coordinate detection accuracy is higher than other methods.

Hereinafter, (2) a tablet using an electromagnetic induction system will be described. The principle of the electromagnetic induction method is shown in FIG. The electromagnetic induction method is realized by a structure in which a high frequency source 1a and a transmitting coil 1b are built in a pen 1 and a plurality of sensor coils 2 are installed on a tablet surface. A magnetic field is generated by flowing a high frequency from the pen 1 to the built-in coil 1b by the high frequency source 1a. This magnetic field produces an electric current in the sensor coil 2 installed on the tablet surface.

The value of the current generated in the sensor coil 2 is
The sensor coil 2 installed in a place close to the pen 1 having a strong magnetic field has a large size, and the sensor coil 2 installed in a place far from the pen 1 having a weak magnetic field has a small size.

The currents detected by the sensor coils 2 by the coil switching circuit 3 are sequentially sent to the receiving circuit 4, and the coordinate position of the pen tip is determined from the magnitude relation of the current values. Coordinate detection is performed for X coordinate and Y coordinate, respectively.
This is performed for each direction of coordinates, and the value of the XY coordinates is set as the coordinate value of the pen tip.

In FIG. 8, one direction (X direction) is used to explain the principle.
Only the three sensor coils 2 are shown in the figure, but in reality, many coils are arranged corresponding to the display screen size or in order to improve the detection accuracy.
Similar coils are also arranged in the direction. Further, in order to further improve the coordinate detection accuracy, the sensor coils 2 may be arranged in an overlapping manner as shown in FIG.

The mounting relationship between the LCD device 10 and the tablet 11 is as shown in FIG.
The tablet 11 is provided on the lower side. The LCD device 10 includes a liquid crystal PCB (Print Circuit) in which an LCD cell 12, a driver IC 13a, a power supply IC 13b, and the like are mounted.
Board: Printed circuit board 14 and TCP (Tape Carri)
er Package) 15 is connected.

The TCP 15 has a driver IC 13a mounted on a flexible tape, and is one of the mounting methods of a driver LSI for a liquid crystal module. The method is called TAB (Tape Automated Bonding). FIG.
The TCP 15 shown by 0 is generally called a bending TPC (two-fold bending TPC), and is used to achieve a thin and lightweight module structure by utilizing flexibility.

The electromagnetic induction type tablet 11 can be installed in the information processing device by installing it between the information processing device main body 16 and the main body lid 17 on the lower side of the LCD device 10 as shown in FIG. Or as shown in FIG. 12, LCD
It is installed as a module (LCD integrated tablet module 18) by being integrated with the device 10.

[0011]

As described above, in the conventional pen input information processing apparatus using the electromagnetic induction type tablet, the tablet 11 is used in combination with the LCD apparatus 10 using the folded TCP 15, as shown in FIG. In this case, the tablet 11 is arranged below the LCD device 10 to detect coordinates. Therefore, as shown in FIG. 10, the driver IC 13a for driving the liquid crystal or the power supply IC 13b mounted on the LCD device 10 is located right above the coordinate detection area of the tablet 11. For this reason, noises from the driver IC 13a and the power supply IC 13b are received, and the coordinates cannot be detected in this portion, or the detection accuracy is deteriorated.

An LCD using a bent TCP 15
When the tablet 11 is used in combination with the device 10, as shown in FIG. 13, the liquid crystal PCB of the LCD device 10 is used.
In the portion where 14 is present and the portion other than the liquid crystal PCB 14, there are a thick portion and a thin portion. Therefore, it is difficult to arrange the LCD cell 12 and the tablet 11 evenly and in parallel, and a spacer 16 and a connecting part (not shown) are required as shown in FIG. 13 for accurate alignment. It was. Spacer 16 is L
In order to stabilize the positional relationship between the CD cell 12 and the tablet 11, it is formed in a planar shape. Therefore, the cost is increased more than necessary and the weight of the device is increased.

The present invention has been made in consideration of the above-mentioned circumstances, and a tablet device for coordinate detection is arranged below the LCD device with improved coordinate detection accuracy and a simplified structure. An object is to provide a pen input information processing device.

[0014]

SUMMARY OF THE INVENTION The present invention relates to a pen input information processing device in which a display device and a tablet for coordinate detection are arranged in an overlapping manner, and the parts mounted for driving the display of the display device are described above. By arranging on the back side of the tablet, there is no component (driver IC, etc.) for driving the display between the pen that indicates the coordinate position and the tablet, so that noise is generated from the component to prevent coordinate detection. Has no adverse effect.

Further, according to the present invention, a printed circuit board on which a component for driving a display is mounted is a TCP (Tape Carrier Packa).
In a pen-input information processing device in which a display device connected to a display panel via ge) and a tablet for coordinate detection are arranged in an overlapping manner, the printed circuit board is arranged on the back side of the tablet, and the tablet is Since it is configured so as to be sandwiched between the display panel and the printed board, the printed board can be arranged on the back surface of the tablet by the two-fold bending TCP, which may adversely affect the coordinate detection from the components mounted on the printed board. It can be avoided.

Further, since the TCPs are provided in three directions of the display panel and the tablets are fixed between the respective printed boards connected to the TCPs in the three directions and the display panel, the tablets are stabilized. Can be fixed.

Further, the tablet has a size larger than that of the display panel, and the TCP has a length corresponding to the size of the tablet, so that a tablet having a size larger than the display panel can be mounted and the coordinates can be adjusted. The detection accuracy can be improved.

The component for driving the display is the T
By mounting on the display surface side of the display panel on the CP,
The component mounting surface of the TCP can be effectively used without adversely affecting the coordinate detection.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the schematic arrangement of a pen input information processing apparatus according to this embodiment. As shown in FIG. 1, the pen input information processing apparatus includes an information processing apparatus main body 20, a tablet controller 22, a display controller 24, a tablet 26, an LCD device 28,
And a pen 29.

The information processing apparatus main body 20 controls the entire pen input information processing apparatus and inputs coordinates detected by the tablet 26 via the tablet controller 22 and the LCD device 28 via the display controller 24. Is displayed on the display screen. Information processing device body 2
0 inputs the coordinates of the position designated by the pen 29, outputs the necessary information to the display controller 24 using the coordinate values corresponding to various applications, and LC
Display on the D device 28.

The tablet controller 22 controls coordinate detection by the tablet 26 under the control of the information processing apparatus main body 20. The tablet controller 22 outputs data indicating the detected coordinate position to the information processing device body 20.

The display controller 24 controls the display on the LCD device 28 under the control of the information processing device body 20. The tablet 26 is the tablet controller 2
Under the control of 2, the coordinate position designated by the pen 29 is detected, and the electromagnetic induction system is used. The tablet 26 is arranged below the LCD device 28, and the detailed positional relationship with the LCD device 28 will be described later.

The LCD device 28 is a display controller 24.
The necessary information is displayed under the control of, for example, the TFT system is used. The pen 29 is an input means for indicating a coordinate position by an electromagnetic induction method, and has a high frequency oscillator, a coil, and a battery built therein. From the pen 29, a magnetic field is generated by applying a high frequency to a built-in coil by a high frequency oscillator, and the tablet 26
A current is generated in the sensor coil arranged in the.

Next, the mounting structure of the tablet 26 and the LCD device 28 will be described. FIG. 2 is a schematic sectional view showing a state in which the tablet 26 and the LCD device 28 are superposed on each other. As shown in FIG. 2, the LCD device 28 is
CD cell 30 (display panel), driver IC and power supply I
Liquid crystal PCB (Print Circuit Board) mounted with C etc.
32 is connected via a TCP (Tape Carrier Package) 34.

The TCP 34 shown in FIG. 2 is generally called a bending TPC (two-fold bending TPC), and is for achieving a thin and lightweight module structure by utilizing flexibility. In this embodiment, the LCD cell 3
The tablet 26 is sandwiched between 0 and the bent TCP 34 (liquid crystal PCB 32).

As a result, the LCD cell 30 and the tablet 26 are brought into close contact with each other, so that a driver IC and a power source I are provided between the pen 29 and the tablet 26 when detecting coordinates.
Since C does not exist, it is not affected by noise or the like from the driver IC or the power supply IC, and a large member or the like for stabilizing the positional relationship between the LCD cell 30 and the tablet 26 is unnecessary.

FIG. 3 is a schematic sectional view showing a state in which the tablet 26 and the LCD device 28 are superposed on each other in the vicinity of the end portion of the LCD cell 30. As shown in FIG.
The bending TCP 34 connected to the D cell 30 is bent in a direction perpendicular to the surface of the LCD cell 30 at the first bending position, and further has a predetermined width capable of sandwiching the tablet 26 at the second bending position. It is bent in a direction horizontal to the plane.

Between the connection portion of the folded TCP 34 with the LCD cell 30 and the first folded position (display surface side)
Driver IC3 for displaying information on the LCD cell 30
6 is implemented. Also, the LC of the bent TCP 34
From the connection with the D cell 30 to the first bending position, L
A tablet 26 larger than the size of the CD cell 30,
A sufficient length is secured so that it can be sandwiched between the LCD cell 30 and the liquid crystal PCB 32.

Also, with the lower surface of the LCD cell 30 (the side opposite to the display surface) and the upper surface of the tablet 26 in close contact, L
A spacer 38 is provided for fixing the positional relationship between the CD cell 30 and the tablet 26 so as not to shift.
The spacers 38 are made of a material such as silicon or rubber, and are provided on the four sides of the LCD cell 30 (rather than in a planar shape).

Next, detailed configurations of the LCD device 28 and the tablet 26 will be described. Figure 4 is an LCD
FIG. 8 is a sectional view showing a detailed configuration of the device 28 (a sectional view taken along line ZZ in FIGS. 6 and 7 described later). As shown in FIG. 4, the LCD cell 30 includes an LCD polarization plate 40, an LCD upper glass substrate 42, and an L side glass substrate in order from the display surface (upper surface) side.
The CD lower glass substrate 44, the LCD polarization plate 46, and the LCD reflection plate 48 are integrally laminated.

The bent TCP 34 includes the LCD cell 30,
The driver IC 36 and the liquid crystal PCB 32 are connected to each other, a signal from the display controller 24 is output to the driver IC 36,
A display signal is sent to the LCD cell 30.

FIG. 5 is a sectional view showing a detailed structure of the tablet 26 (a sectional view taken along line ZZ in FIGS. 6 and 7 described later). As shown in FIG. 5, the tablet 26
Is composed of a tablet insulating sheet 50, a tablet substrate 52, a tablet shield plate 54, and a tablet insulating sheet 56, which are laminated in this order from the upper side.

The electromagnetic induction type tablet 26 is a pen 2
Coordinates are detected based on the magnetic field generated from the information processing device 9 by the tablet shield plate 54.
It does not affect each part within 0.

The tablet 26 is fixed directly to the LCD cell 30, but by sticking the tablet insulating sheet 50 to the tablet substrate 52 and the tablet insulating sheet 56 to the tablet shield plate 54, the LCD cell 30 and the liquid crystal PCB 32 are electrically connected. Prevent physical contact. In addition, the tablet insulating sheet 50 is used for the LCD of the LCD device 28.
The cell 30 can be brought into close contact with the cell 30 in a stable manner, and the tablet insulating sheet 56 prevents the liquid crystal PC from being irrelevant to unevenness due to differences in the shapes of components mounted on the liquid crystal PCB 32.
B32 can be brought into stable close contact.

FIG. 6 is a plan view showing the LCD cell 30 and a part of the folded TCP 34 of the LCD device 28 together with the driver IC 36. As shown in FIG. 6, in the present embodiment, X detected by the tablet 26 in coordinates.
X upper PCB60, X lower PCB in the X direction of the Y coordinate system
61 is provided, and a Y-side PCB 62 is provided in the Y direction. The X-side PCB 60 and the Y-side PCB 62 are connected by a connection cable 63a, and the Y-side PCB 62 and the X-lower PCB 61 are connected by a connection cable 63b. The display controller 24 is connected to one of the PCBs (for example, the Y-side PCB 62) and further connected to other PCBs (for example, the X-upside PCB 60 and the X-downside PCB 61) via the connection cables 63a and 63b.

The X upper side PCB 60 includes a plurality of X drivers T.
Connected to the LCD cell 30 by CP64 (upper side),
The X lower PCB 61 is connected to a plurality of X drivers TCP65 (lower side), and the Y side PCB 62 is connected to a plurality of Y drivers TCP67.

FIG. 7 is a plan view of the LCD device 28. As shown in FIG. 7, an X driver IC 70 is mounted on each of the X driver TCP 64, and an X driver TC
An X driver IC 71 is mounted on the P65, and a Y driver IC 72 is mounted on the Y driver TCP 67.

As shown in FIGS. 6 and 7, the X driver T
Since the tablet 26 is sandwiched between the LCD cell 30 and each liquid crystal PCB from three directions by the CPs 64 and 65 and the Y driver TCP 67, the tablet 26 can be stably fixed.

Further, by not bending the X driver TCP 64, 65 and the Y driver TCP 67 immediately from the connection portion with the LCD cell 30, but bending them according to the length of the tablet 26 as shown in FIG. 3 or FIG. LC
The tablet 26 larger than the size of the D cell 30 can be mounted.

In the electromagnetic induction type tablet 26, a current is generated in the sensor coil arranged on the tablet surface by the magnetic field from the pen 29. Since the number of sensor coils affected by the magnetic field is reduced, the coordinate detection accuracy is lower than that near the center of the tablet.

Therefore, as shown in FIG. 7 (or FIG. 3), by making the size of the tablet 26 larger than that of the LCD cell 30, good coordinate detection accuracy can be obtained in the entire coordinate detection effective area. That is, since the instruction to the pen 29 is usually given when pointing to the content (icon or the like) displayed on the LCD cell 30, the range of the LCD cell 30 is the coordinate detection target. Therefore, since the size of the tablet 26 is larger than the LCD cell 30, the position indicated by the pen 29 at the end of the range of the coordinate detection target is the tablet 26.
Therefore, good coordinate detection accuracy can be obtained.

Further, since the X driver ICs 70 and 71 and the Y driver IC 72 are mounted on the display surface side of the X driver TCPs 64 and 65 and the Y driver TCP 67, each TCP is mounted.
The mounting surfaces of 64, 65, 67 can be effectively used. At this time, even when the vicinity of the end of the LCD cell 30 is indicated by the pen 29, the driver ICs 70, 71, 72 are not located between the pen 29 and the tablet 26. The accuracy of coordinate detection is not deteriorated by the influence of noise or the like generated from the above.

In this way, in the pen input information processing device equipped with the LCD device using the folded TCP,
Mount the tablet 26 on the LCD cell 30 and the liquid crystal PCB 3.
Bending TCP34 by making it sandwiched between 2 and
Since the display parts of the LCD mounted on the liquid crystal PCB 32 connected to are arranged on the back side of the tablet substrate 52, accurate coordinate detection can be performed without being affected by noise from the LCD device 28 such as the driver IC 36. Can be done.

By mounting the tablet 26 between the LCD cell 30 and the liquid crystal PCB 32,
Since the mounting surface of the tablet 26 is the back side of the LCD cell 30 and the mounting surface of the tablet 26 is flat, an extra spacer or the like for mounting the tablet 26 is not required, and the cost and weight are not increased. Tablet 2
6 can be implemented.

In the above-described embodiment, the tablet 26 for detecting coordinates by the electromagnetic induction method is used. However, if the tablet for coordinate detection is arranged on the lower side of the display device, it will be described. The configuration of the present invention can be used even in another system different from the electromagnetic induction system.

Further, in the above description, as shown in FIGS. 6 and 7, the LCD cell 30 of the LCD device 28 includes the Y driver TCP 67 in one direction and the X driver TCP 6 in two directions.
The tablet 26 is fixed between the LCD cell 30 and the liquid crystal PCB 32 by means of 4, 65. The Y driver TCP in two directions and the X driver T in one direction are fixed.
It can also be realized by CP, or one-way X driver TCP and Y driver TCP respectively.

In addition to the reflective LCD, the LCD device 28 has a structure in which the tablet 26 is folded and sandwiched by the TCP 34 together with the backlight in the transmissive LCD in which the backlight is provided behind the LCD cell 30 in addition to the reflective LCD. But it is possible.

[0048]

As described above in detail, according to the present invention, the coordinate detection accuracy is improved, and the structure is simplified, so that the cost is reduced and the weight of the apparatus is reduced.
It is possible to provide a pen input information processing device in which the D device and the coordinate detection tablet device are arranged in an overlapping manner.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a pen input information processing device according to an embodiment of the present invention.

FIG. 2 is a schematic cross-sectional view showing a state in which the tablet and the LCD device are overlapped with each other in the present embodiment.

FIG. 3 is a schematic cross-sectional view showing a state in which a tablet and an LCD device are superposed on each other in the vicinity of an end portion of an LCD cell in the present embodiment.

FIG. 4 is a cross-sectional view showing a detailed configuration of the LCD device according to the present embodiment.

FIG. 5 is a sectional view showing a detailed configuration of the tablet 26 in the present embodiment.

FIG. 6 is a plan view of the LCD device according to the present embodiment in which a part of the LCD cell and the bent TCP are removed together with the driver IC.

FIG. 7 is a plan view of the LCD device according to the present embodiment.

FIG. 8 is a diagram for explaining the principle of a tablet using an electromagnetic induction method.

FIG. 9 is a view showing an arrangement example of sensor coils in a tablet.

FIG. 10 is a view showing a mounting relationship between a conventional LCD device and a tablet.

FIG. 11 is a diagram showing an example of incorporating an electromagnetic induction type tablet into an information processing apparatus.

FIG. 12 is a diagram showing an example of incorporating an electromagnetic induction type tablet into an information processing apparatus.

FIG. 13 is a diagram showing a state in which a tablet is used in combination with an LCD device using a folded TCP.

[Explanation of symbols]

 20 ... Information processing device main body 22 ... Tablet controller 24 ... Display controller 26 ... Tablet 28 ... LCD device 29 ... Pen 30 ... LCD cell 32 ... Liquid crystal PCB 34 ... TCP (Tape Carrier Package) 36 ... Driver IC 38 ... Spacer 40 ... LCD Polarizing plate 42 ... LCD upper glass substrate 44 ... LCD lower glass substrate 46 ... LCD polarizing plate 48 ... LCD reflective plate 50, 56 ... Tablet insulating sheet 52 ... Tablet substrate 54 ... Tablet shield plate 60 ... X upper PCB 61 ... X lower Side PCB 62 ... Y side PCB 70, 71 ... X driver IC 72 ... Y driver IC

Claims (5)

[Claims] 1. In a pen-input information processing device in which a display device and a tablet for coordinate detection are arranged in an overlapping manner, a component mounted for driving the display of the display device is arranged on the back side of the tablet. Characteristic pen input information processing device. 2. A pen in which a display device in which a printed circuit board on which a component for driving a display is mounted is connected to a display panel via a TCP (Tape Carrier Package) and a tablet for coordinate detection are superposed on each other. In the input information processing apparatus, the printed circuit board is arranged on the back side of the tablet, and the tablet is sandwiched between the display panel and the printed circuit board. 3. The TCP is provided in three directions of the display panel, and the tablet is fixed between each printed circuit board connected to the TCP in the three directions and the display panel. Item 2. The pen input information processing device according to item 2. 4. The pen input information processing apparatus according to claim 2, wherein the tablet has a size larger than that of the display panel, and the TCP has a length corresponding to the size of the tablet. 5. A component for driving display is the TCP.
The pen input information processing apparatus according to claim 2, wherein the pen input information processing apparatus is mounted on the display surface side of the display panel.