JPH0934635A - Display device and input device used for this device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To input position information without externally adding a special device by inputting the position information in accordance with the position of light reception/non-reception of a light reception sensor provided in the peripheral part of the picture display area of a display panel. SOLUTION: In a display panel driving circuit 14, position information is inputted in accordance with the position of light reception/non-reception of a CCD array 13 as a light reception sensor element. When a material like a finger is put above this CCD array 13, a corresponding part is shadowed, and the quantity of input light is reduced. At the time of movement detection, only the part of the signal changed with time is detected. The change of the shadow at the time when the finger is brought into contact with a glass is checked to detect whether the finger is brought into contact with the glass or not. This CCD array 13 is attached to each of upper, lower, and right sides of a substrate 11 of a portable terminal to control the output picture of a display device part 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device and an input device used therein.

[0002]

2. Description of the Related Art Since a thin film transistor (TET) can be formed on a substrate having a large area and various materials, it is expected to be applied in various fields. Today, it is used as a switching element in a liquid crystal display element as the largest application field. At present, TFTs that have been put into practical use use amorphous silicon. However, since amorphous silicon has low mobility, the element size becomes large in order to switch a large current. There are problems such as not being able to. As a means for solving this, an attempt has been made to manufacture a TFT by using polycrystalline silicon for a channel. Polycrystalline silicon has a high mobility and allows the TFT to be miniaturized, and is suitable for being applied to a compact and highly vivid display element. As an application of such a small display element, it is often used as a terminal that an individual moves to use.

In these devices, input functions such as a keyboard and a pointing device in an input device of an ordinary terminal must be incorporated in one device. Currently, the pointing device is a mouse,
Although a trackball is generally used, it is used in a small and medium-sized terminal for a general purpose. Therefore, the device as described above is too large and difficult to use. Pen input is used as a means to solve these problems, but since a film for position detection is used by sticking it on the surface of the display device,
It has been a factor that reduces the brightness of the display device. Also,
Generally, since a dedicated pen is used, there are many problems such as loss of input function due to loss of the pen.

[0004]

As described above, the conventional small and medium-sized portable terminals do not have an excellent pointing device, and the portability cannot be sufficiently exhibited.

The present invention has been made in view of the above problems, and an object thereof is to enable position input without adding a special device to the outside.

[0006]

According to the present invention, there are provided a display panel including an image display area in which pixels are two-dimensionally arranged, and at least one vertical and horizontal outer peripheral portion of the image display area of the display panel. Light receiving sensor elements are arranged on the side,
A display device, comprising: an input device for inputting position information corresponding to a light receiving / non-light receiving position of the light receiving sensor element.

Further, an image input element consisting of a light receiving sensor element is arranged in a one-dimensional or two-dimensional manner on at least one side of the outer periphery of the display panel including an image display area in which pixels are two-dimensionally arranged. It is an input device which is formed and receives position information corresponding to the light receiving / non-light receiving positions of the light receiving sensor element.

According to the present invention, for example, in a liquid crystal display device in which a pixel electrode is switched by a thin film transistor, a one-dimensional or two-dimensional input element is formed on at least one of the outer peripheries of a two-dimensionally arranged pixel display section. It is suitable for such a case. Further, at this time, it is preferable that the input device is a charge transfer element using polycrystalline silicon.

The input device of the present invention is one in which a charge transfer device is arranged, for example, vertically / horizontally on the outer periphery of the display device, and a finger or a general pen is held over the charge transfer device to charge the charge using polycrystalline silicon. It is provided with a light receiving sensor element such as a transfer device, and when a finger or the like is held over it, a shadow is formed on the light receiving sensor element. Here, when the finger that is held over is moved, the shadow also moves, so that the position of the shadow can be detected by the light receiving sensor element. Further, for example, one of the light receiving sensor elements arranged in each of the column and the row, one in each of the two light receiving sensor elements in total, that is, when the column is in the Y direction and the row is in the X direction, When a shadow is placed at a certain coordinate (X, Y), 2 on the XY coordinate
It can be used as a pointing device that specifies a dimensional position.

[0010]

Embodiments of the present invention will be described below. FIG. 1 is an explanatory diagram of one embodiment of the present invention.

This display device is a display panel 11 for displaying an image, and includes a display panel 11 including an image display area 12 in which pixels are two-dimensionally arranged, and the display panel 11.
The vertical and horizontal edges of the image display area 12 are
An input unit of an input device formed by arranging a CCD array 13 as a light receiving sensor element in a dimension and a display panel drive circuit 14 are provided.

The display panel drive circuit 14 receives position information corresponding to the light receiving / non-light receiving positions of the CCD array 13 which is the light receiving sensor element. The display panel drive circuit 14 is a display panel drive circuit 14 that drives the display panel 11 to display an image, and displays a position corresponding to position information input from the CCD array 13 which is the input unit of the input device. Image display area 1 of display panel 11
The display panel drive circuit 14 controls the second display image.

In this embodiment, the display panel 11 is poly.
It is a 4-inch type TFT LCD using -si.
Charge-coupled devices, that is, CCD arrays 13 are formed by poly-si on the lower and right sides on the same substrate.

Although not shown, on the left side of the display panel 11, lead wires for the display panel drive circuit 14 and the CCD sensor 13 are arranged.

Next, a method of using the CCD array 13 as a pointing device will be described below.

When an object such as a finger is held over the CCD array 13, a shadow is formed on the held portion and the amount of incident light is reduced. In such a case, the output of the CCD array 13 has a low signal level only in the shaded area as shown in FIG. When this is detected, the central portion of the shadow is received as an input of position information.

Further, in the case of detecting only the motion, only the changing portion of the signal with time is detected. In the present embodiment, by detecting the difference signal obtained by subtracting the next frame signal from the one frame signal by subtracting the signal of the next time from the signal of a certain time, it is possible to detect the moving direction as shown in FIG. it can.

Further, as shown in FIG. 5, it is possible to detect whether or not the finger has come into contact with the glass by examining the change in the shape of the shadow when the finger comes into contact with the glass. Based on the detection signal voltage of the CCD array 13 as shown in FIG. 2, it may be subjected to the second-order differentiation by a differentiating circuit and detected as a steep pulse waveform. As a result, it can be used in contact / non-contact in place of the switch.

In this embodiment, CCDs are installed on the upper, lower and right sides. Most of the software we use now
This is because it is designed to display a control pattern on the lower and right sides, and the icon is moved to this pattern to control the output image, which is to cope with that.

A point on the right CCD array and a CC on the bottom
If you bring your finger on the intersection with one point of the D array, you can get the signal that specifies the position on the two-dimensional coordinate plane of up, down, left and right. This is the same as the output of a normal pointing device.

The present invention can also be used as a digitizer by adding a simple mechanism as shown in FIG. 4, and its application range is wide. Note that, in FIG. 4, the same parts as those in FIG. 1 are denoted by the same reference numerals. In this case, a two-dimensional C at the lower right corner of the display panel 12
The feature is that the CD sensor 41 is installed. It can be used as a digitizer in combination with a light source and a microlens. This enables input. This CC
By detecting the shadow of the object placed on the D sensor 41,
It can be used as a pointing device to input a position on a two-dimensional plane coordinate. In addition to this, detection of fingerprints and the like can also be used as an input / output device for managing entry into a management area. That is, a fingerprint can be detected by this CCD, that is, an image of the fingerprint can be input, and the entry-authorized person can be managed based on the image information of the fingerprint.

In addition, one-dimensional or two-dimensional charge transfer elements may be placed and used alone or in combination at any of the upper, lower, left and right positions according to the purpose of use.

[0023]

As described above in detail, according to the present invention, it becomes possible to build a device for inputting a position in a small and medium-sized portable terminal. Moreover, since the charge transfer element is used, the number of wirings to the element is small, and it is possible to prevent the number of wirings outside the display device from being increased significantly.

[Brief description of drawings]

FIG. 1 is a diagram showing an embodiment of a display device with an input device using a one-dimensional CCD array according to the present invention.

FIG. 2 is a diagram showing an example of an output signal of the present invention.

FIG. 3 is a diagram showing an example of an output signal and a difference when an object moves.

FIG. 4 is a diagram showing an embodiment of a display device with an input device using a two-dimensional CCD array according to the present invention.

FIG. 5 is based on the detection signal voltage of the CCD array 13,
It is a figure which shows an example of the method of detecting it as a steep pulse waveform by carrying out the second-order differentiation with the differentiating circuit.

[Explanation of symbols]

 11 ... Substrate 12 ... Display unit 13 ... One-dimensional CCD array 14 ... Display device driving circuit 41 ... Two-dimensional CCD array

Claims (2)

[Claims] 1. A display panel including an image display area in which pixels are two-dimensionally arranged, and light receiving sensor elements are arranged on at least one vertical and horizontal side of a peripheral portion outside the image display area of the display panel. And an input device for inputting position information corresponding to light receiving / non-light receiving positions of the light receiving sensor element. 2. A display panel including an image display area in which pixels are two-dimensionally arrayed, is provided on at least one side of an outer periphery of the display panel.
An input device, which is formed by arranging one-dimensionally or two-dimensionally an image input element composed of a light-receiving sensor element and receives position information corresponding to the light-receiving / non-light-receiving position of the light-receiving sensor element.