JPH0438002B2 - - Google Patents

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> As shown in FIG. 5, for example, a conventionally proposed handwriting input display device includes an electromagnetic induction type transparent coordinate detection plate 1, a polarizing plate 2, and a glass substrate 3 constituting a liquid crystal display panel. , 4 and a reflective plate 5 with a polarizing plate are laminated in this order, and the other type is a type in which a polarizing plate 7, glass substrates 8 and 9 constituting a liquid crystal display panel, and a reflective plate 10 with a polarizing plate are laminated in order, as shown in FIG. There are two types in which electromagnetic induction type transparent coordinate detection plates 11 are laminated in order, but in both cases, the device is thick and difficult to reduce in size and weight, and a misalignment occurs between the detected coordinates and the display position. There was a problem that a correction circuit was required.

<Purpose> The present invention has been made in view of the above-mentioned conventional problems, and its purpose is to provide transparent electrodes for display and metal wires for coordinate detection on the inner surface of a glass substrate constituting a liquid crystal display panel. It is an object of the present invention to provide a handwriting input display device that does not affect the display, is thin, does not require a correction circuit, and can detect coordinates because the metal wire for coordinate detection can be configured with a narrow width. purpose.

<Example> The present invention will be described in detail below based on the drawings.
FIG. 1 is a side view of a 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. Both substrates are overlapped with a spacer interposed therebetween, and liquid crystal is sealed inside.

As shown in FIG. 2, transparent electrodes 17 for display are provided on the inner surfaces of both substrates 13 and 14 at appropriate intervals (50 mm).
A plurality of input pen coordinate detection electrodes 19 with a width of 10 to 15 are formed between the transparent electrodes 17, and both substrates 1
3 and 14 are superimposed so that their respective electrodes are perpendicular to each other. That is, this liquid crystal display panel is a dot matrix display device, and
It also serves as a coordinate detection device for the input pen.

By the way, in general, when the size of the dot is 300 mm, the distance between the transparent electrodes is about 50 mm, so there is a method of forming the above-mentioned coordinate detection electrode 19 using a transparent electrode material, but in this case, the electrode width If it is 10~15〓, the resistance value is about 30~50MΩ for a 10cm length, which is so large that it cannot function as a wiring. Therefore, in this embodiment, the metal wire is used as the coordinate detection electrode 1.
It is used as 9. This metal has the advantage that it does not affect the display because it is invisible to the naked eye with a width of 10㎓.For example, if a Cr-Cu-Au metal wire is used, the wiring resistance will be 10KΩ at 10cm, which is sufficient for use. Become.

In addition, 18 is a terminal of the transparent electrode 17, 20 is a terminal of the coordinate detection electrode 19, and FIG.
8 and 20 are arranged on both sides, but they may be arranged only on one side as shown in FIG. 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, and 22 is 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, use the magnetic flux generation pen 16 to touch the liquid crystal display panel 2.
When data is written on the surface of the CPU 25, the data is detected by the coordinate detection CPU 25, and
The data is stored in the memory 24 under the control of No. 3. Then, the CPU 22 for driving the liquid crystal display panel reads the data in the memory 24, that is, the magnetic flux generating pen 16.
The device is configured so that data input by the user is displayed on the liquid crystal display panel.

As described above, in the embodiment device, the liquid crystal display panel 21
Transparent electrodes 17 of glass substrates 13 and 14 that constitute
Since the coordinate detection electrode 19 is provided on the same plane as the coordinate detection electrode 19, a separate coordinate detection plate is 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 misalignment between the detected coordinates and the display position.

<Effects> As described above in detail, the handwriting input display device of the present invention has transparent electrodes for display and metal wires for coordinate detection on the inner surface of the glass substrate constituting the liquid crystal display panel. Since the metal wire can be configured to have a narrow width, it is possible to provide a handwriting input display device that does not affect the display, has a thin plate, does not require a correction circuit, and can detect coordinates.

[Brief explanation of drawings]

FIG. 1 is a side view of the handwriting input display device according to the present invention, FIGS. 2 and 3 are diagrams showing examples of forming transparent electrodes and coordinate detection electrodes, and FIG. 4 is a system configuration diagram of the device of the present invention. , FIG. 5 and FIG. 6 are diagrams illustrating a conventional device. 12 is a polarizing plate, 13 and 14 are glass substrates, 15
16 is a reflective plate with a polarizing plate, 16 is a pen for generating magnetic flux, 17 is
18 is a transparent electrode, and 18 is a coordinate detection electrode.

Claims (1)

[Scope of Claims] 1. 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, comprising: A first transparent electrode for display and a first coordinate detection electrode of the input pen made of a metal wire are provided on the first surface in parallel between the first transparent electrode, and the liquid crystal A second transparent electrode and a second coordinate detection electrode of the input pen made of a metal wire are provided on a second surface of the display panel in parallel between the second transparent electrode; The first transparent electrode and the first coordinate detection electrode on one surface and the second transparent electrode and second coordinate detection electrode on the second surface are provided to be orthogonal to each other. A handwriting input display device characterized by: