JPS6226531A - Handwritten input display device - Google Patents

Abstract

PURPOSE:To obtain the titled device which is thin and can display a handwritten input without requiring a correcting circuit at all, by providing a coordinate detecting electrode of an input pen, in a liquid crystal display panel. CONSTITUTION:Substrates 13, 14 are superposed through a spacer, and its inside is filed with a liquid crystal. In the inner surface of the substrates 13, 14, plural pieces of transparent electrodes 17 for display use are formed at a suitable interval. Between each transparent electrode 17, a coordinate detecting electrode 19 of an input pen of 10mu-15mu is formed, and these substrates 13, 14 are superposed so that the respective electrodes become orthogonal to each other. That is to say, this liquid crystal display panel is a dot matrix display device, and also serves as a coordinate detecting device of the input pen, as well. Since the coordinate detecting electrode 19 is provided on the same plane as the transparent electrode of the substrates 13, 14, it is unnecessary to provide separately a coordinate detecting plate.

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a handwriting input display device that can detect the coordinates of an input pen on a liquid crystal display panel and display the handwriting of the input pen on the display panel. be.

<Prior art> Conventionally proposed handwriting input display devices include, for example, the fifth handwriting input display device.
As shown in the figure, an electromagnetic induction type transparent coordinate detection plate l,
a polarizing plate 2, a glass substrate 3 constituting a liquid crystal display panel,
4 and a reflective plate 5 with a polarizing plate are laminated in order,
Another type is a tie made by laminating in order a polarizing plate 7, glass substrates 8 and 9 constituting a liquid crystal display panel, a reflecting plate 10 with a polarizing plate, and an electromagnetic induction transparent coordinate detection plate 11, as shown in FIG. There are two methods, but both have problems in that the devices are thick and difficult to reduce in size and weight, and a correction circuit is required due to the misalignment between the detected coordinates and the display position.

<Purpose> The present invention has been made in view of such conventional problems, and
The purpose is to provide a handwriting input display device that is thin and does not require any correction circuits by providing electrodes for detecting the coordinates of an input pen within a liquid crystal display panel.

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

No. 111 is a top view of the handwriting input display device according to the present invention.

In the figure, 12 is a polarizing plate, and 13 and 14 are glass substrates constituting a liquid crystal display panel.The two substrates are overlapped with a spacer interposed therebetween, and liquid crystal is sealed inside.

As shown in FIG. 2, the inner surfaces of both substrates 13 and 14 are provided with
The transparent electrodes 17 for display are spaced at appropriate intervals (50μ to 100μ
), and furthermore, between each of the transparent electrodes 17, an I
An input pen coordinate detection electrode 19 having a width of 0.mu. to 15.mu. is formed, and both substrates 13 and 14 are stacked so that the respective electrodes are perpendicular to each other. That is, this liquid crystal display panel is a dot matrix display device and also serves as a coordinate detection device for an input pen.

By the way, when the size of the dot is 300μ, the distance between the transparent electrodes is generally about 50μ, but there is also a method of forming the coordinate detection electrodes 19 described above using a transparent electrode material.
In this case, if the electrode width is 10 to 15 .mu., the length of the IO wire is about 30 to 50 M.OMEGA., and the resistance value is so large that it cannot serve as a wiring. Therefore, in this embodiment, a metal wire is used as the coordinate detection electrode 19. This metal line has the advantage that it does not affect the display because it is invisible to the eye and has a width of 1 μm.
If you use Au metal wire, the wiring resistance is 10α, which is OK.
Ω and is fully usable.

Note that 18 is a terminal of the transparent electrode 17, and 20 is a terminal of the coordinate detection electrode 19. Fig. 2 shows an example in which the terminals 18 and 20 are arranged on both sides, but as shown in Fig. 3, they are arranged only on one side. You may also arrange it. Further, 16 is a pen for generating magnetic flux.

Figure 4 is a system configuration diagram, and to explain a little based on this diagram, 21 in the figure is the above-mentioned liquid crystal display panel,
22 is a CPU for driving the liquid crystal display panel, 23 is a central processing unit (CPU), 24 is a memory, 25 is a central processing unit (CPU) for pen coordinate detection, and 26 is a magnetic flux generation circuit.

Now, when data is written on the surface of the liquid crystal display panel 21 with the magnetic flux generation pen 16, the data is transferred to the coordinate detection CPU.
25 and stored in memory 24 under the control of central processing unit 23. The CPU 22 for driving the liquid crystal display panel displays the data in the memory 24, that is, the data input by the magnetic flux generating pen 16, on the liquid crystal display panel.

As described above, in the embodiment device, the coordinate detection electrode 19 is provided on the same plane as the transparent electrodes 17 of the glass substrates 13 and 14 constituting the liquid crystal display panel 2I, so a separate coordinate detection plate is not required. Furthermore, since the transparent electrode 17 and the coordinate detection electrode 19 are formed on the same plane, it is possible to prevent the occurrence of a deviation between the detected coordinates and the display position.

<Effects> As explained above in detail, the handwriting input display device of the present invention is thin and has a coordinate detection electrode provided on the transparent electrode forming surface of the liquid crystal display panel together with the transparent electrode. It is possible to provide a handwriting input display device that does not require any circuitry.

[Brief explanation of the drawing]

FIG. 1 is a side view of the handwriting input display device according to the present invention, and FIG.
3 and 3 are diagrams showing examples of forming transparent electrodes and coordinate detection electrodes, and FIG. 4 shows a system 12 of the apparatus of the present invention, a polarizing plate, 13 and 14 a glass substrate, 15 a reflecting plate with a polarizing plate, and 16 a polarizing plate. Magnetic flux generation pen, 17 is a transparent electrode, 18 is a representative electrode for coordinate detection Patent attorney Yoshihiko Fukushi (and 2 others) 15 Figure 1 Figure 2 Figure 3 z Figure 4

Claims (1)

[Scope of Claims] 1. In a handwriting input display device capable of detecting the coordinates of an input pen on a liquid crystal display panel and displaying the handwriting of the input pen on the display panel, A handwriting input display device, characterized in that an electrode for detecting coordinates of the input pen is provided on a surface on which a transparent electrode is formed.