JPS60205625A - Tablet for handwriting information input - Google Patents

Abstract

PURPOSE:To obtain a tablet for handwriting information input which allows input operation with a finger tip without using any special pen and also has an easy-to-see display by laminating a film liquid-crystal display body and a pressure-sensitive tablet. CONSTITUTION:A polarizing plate 10, film substrates 11 and 12, polarizing plate 13, and reflecting plate 14 are laminated and liquid crystal is charged between both substrates to form the film liquid-crystal display body 20. The pressure- sensitive tablet 15 is laminated under the display body 20 successively together with a base plate 16, and pressure applied onto the display body is transmitted to the tablet as it is. When handwriting operation is started, changeover switches SW1 and SW2 are both placed at sides of contacts (a) to detect the (x) coordinate of the pressing position and both switches are placed at sides of contacts (b) to detect the (y) coordinate. Therefore, handwritten information is stored in memory 22 by operating the switches SW1 and SW2 at a specific period and displayed on the display body 20.

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a tablet for inputting handwritten information, which can input information such as handwritten characters and figures into a computer, etc., and can display the information on a liquid crystal display. It is something.

<Prior Art> As a tablet for inputting handwritten information in which a display section consisting of a liquid crystal display and a handwriting input section are common, a structure similar to a conventional proposal has been proposed.

That is, as the cross section is shown in FIG. 3, a liquid crystal display is constructed by laminating a polarizing plate 1, glass substrates 2 and 8, a polarizing plate 4, and a reflecting plate 5, and sealing liquid crystal between the glass substrates. and,
It is electrically connected to a circuit board 7 through a rubber connector 6, and a transparent electromagnetic induction type tablet 8 is placed on a liquid crystal display.

When characters are handwritten on the tablet 8 using the pen 9, the magnetic flux from the pen is detected and the position of the pen is determined, thereby all character information is recognized and the information is displayed on the liquid crystal display. It has become.

However, with such conventional tablets, a specific pen is required for handwriting input, so there is a problem in that information cannot be input easily. Furthermore, since the tablet 8 must be made transparent, the cost is inevitably high, and due to the material of the transparent electrode and the tablet, very high transparency cannot be expected, resulting in a problem that the display contents of the liquid crystal display lack visibility. There is.

<Purpose> The present invention has been made in view of such conventional problems, and
The purpose of this is that by laminating a film liquid crystal display and a pressure-sensitive tablet, it is possible to input data simply with a fingertip without using a special pen, and the content displayed on the liquid crystal display can be easily read by handwriting. The aim is to provide a tablet for inputting information.

<Example> The present invention will be explained in detail below based on the drawings.

FIG. 1 is a cross-sectional view of a tablet according to the present invention. In the figure, 10 is a polarizing plate, 11 and 12 are flexible film substrates, 13 is a polarizing plate, and 14 is a reflecting plate. A one-film liquid crystal display is constructed by stacking the film substrates and sealing liquid crystal between the film substrates.

Reference numeral 15 denotes a pressure-sensitive tablet, which is sequentially laminated under the above-mentioned film liquid crystal display together with the tablet support plate 16, and is formed so that the pressing blade on the liquid crystal display is directly transmitted to the tablet.O17 is a circuit. This board is electrically connected to the above-mentioned liquid crystal display through a rubber connector 18.

FIG. 2 is a block circuit diagram of this tablet, and a more detailed explanation will now be given with reference to this diagram.

In the figure, 20 is a film liquid crystal display, 21 is a display drive circuit, 22 is a memory for storing patterns to be displayed, and 23 is a microprocessor.

Reference numerals 24 and 25 denote a resistor in the X direction and a resistor in the Y direction, which constitute the pressure-sensitive tablet 15. This resistor is formed, for example, by applying carbon to the surface of a film having approximately the same size as the display surface of a liquid crystal display. And these X,
The Y resistors 24 and 25 are arranged at regular intervals with their carbon-coated surfaces facing each other, and the X and Y resistors 24 and 25 at that portion come into contact with each other by pressing pressure from a fingertip during handwriting input.

26 is a constant current source, SWI and SW2 are changeover switches, and 7chi. Changeover switch 5Wlt consists of two interlocking switches, and the common terminal of one switch is connected to a constant current source 26.
is connected to the common terminal of the other switch, and amplifier 2 is connected to the common terminal of the other switch.
7 is connected.

Further, the common terminal of the other changeover switch SW2 is connected to the amplifier 27 and the press detection circuit 28, and is further grounded via a resistor.

The suppression detection circuit 28 detects whether handwriting has been performed on the film liquid crystal display 20 or not. Also, 29
is an A/D converter.

In the circuit configuration described above, the constant current source 2 is connected to the resistor 24.25.
A constant current is supplied from 6, and the resistor 24 in the X direction and the Y
When the resistor 25 in the direction comes into contact with the hand at a suitable location, the current divided voltage value by the X-direction resistor 24 and the divided voltage by the Y-direction resistor 25 are changed by switching control of the changeover switches SWI and SW2. This value is used to detect the suppression position. The data of the suppression position is converted into digital data by the A/D converter 29, and is written as display information to the address of the memory 22 corresponding to the coordinates of the blind position under the control of the microprocessor 23.

That is, initially, the changeover switch SWI is connected to the contact a1 and the changeover switch SW2 is connected to the contact A, and it is determined based on the voltage change input to the suppression detection circuit 28 whether or not handwriting has started. When handwriting starts here,
First, selector switches SWI and SW2 are both connected to contact a, and the X coordinate of the pressed position is detected from the divided voltage value from resistor 24. Next, selector switches SWI and SWI are both connected to contact a, and the resistor The X coordinate of the suppression position is detected from the divided voltage value from 25. Therefore, handwritten information is stored in the memory 22 and displayed on the film liquid crystal display 20 by switching the changeover switches SWI and 5W2i at regular intervals as described above.

Therefore, when handwriting is performed on the film liquid crystal display 20 with a fingertip, the handwritten information is detected by the pressure-sensitive tablet 15, stored in the display memory 22 as digital data, and then displayed on the film by the display drive circuit 21. It is displayed on the liquid crystal display 20.

Effects> As described above, the handwritten information input tablet of the present invention is equipped with a flexible film liquid crystal display using a film substrate and a pressure-sensitive tablet, and has a pressure sensitive effect on the film liquid crystal display. Since the information is stacked and arranged so as to be transmitted to the tablet, handwritten input can be performed simply with the tip of a finger without using a specific pen. Furthermore, since the liquid crystal display is located on the surface and is not placed under a transparent tablet as in the conventional case, the displayed contents can be seen much more easily.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a tablet according to the present invention, FIG. 2 is a block circuit diagram thereof, and FIG. 3 is a sectional view of a conventional tablet. 11 and 12 are film substrates, 15 is a pressure-sensitive tablet,
20 is a film liquid crystal display, 22 is a display memory, 23
microprocessor - 124, 25 resistor 1, 28
is the pressure detection circuit, 29 U A/D Contweeter agent Patent attorney Yoshihiko Fukushi (and 2 others) 0/'' Figure 3

Claims (1)

[Claims] 1. A tablet for inputting and displaying handwritten information is provided with a flexible film liquid crystal display using a film substrate and a pressure-sensitive tablet, and a pressing blade on the film liquid crystal display is connected to the tablet. A tablet for inputting handwritten information, which is characterized by being arranged in layers to convey information.