JP2000099268A - Liquid crystal display device with coordinate position detecting function - Google Patents

Liquid crystal display device with coordinate position detecting function

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Publication number
JP2000099268A
JP2000099268A JP26607598A JP26607598A JP2000099268A JP 2000099268 A JP2000099268 A JP 2000099268A JP 26607598 A JP26607598 A JP 26607598A JP 26607598 A JP26607598 A JP 26607598A JP 2000099268 A JP2000099268 A JP 2000099268A
Authority
JP
Japan
Prior art keywords
liquid crystal
crystal display
transparent electrode
lower transparent
display device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
JP26607598A
Other languages
Japanese (ja)
Inventor
Kazunobu Nakano
和延 中野
Original Assignee
Nec Eng Ltd
日本電気エンジニアリング株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nec Eng Ltd, 日本電気エンジニアリング株式会社 filed Critical Nec Eng Ltd
Priority to JP26607598A priority Critical patent/JP2000099268A/en
Publication of JP2000099268A publication Critical patent/JP2000099268A/en
Withdrawn legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device with a coordinate detecting function which eliminates the need for coordinate positioning and which is made thin, small-sized and light. SOLUTION: The device has a liquid crystal display matrix part where display element 21 each corresponding to one pixel of a liquid crystal display are arrayed in matrix, row select lines Y1, Y2... Yn for selecting the respective display elements 21 of the liquid crystal display matrix part, upper transparent electrodes which are arranged on the front of the liquid crystal display panel, lower transparent electrodes 12 which are arranged opposite to the display elements 21 and which detect the states of contact with the upper transparent electrodes, and sense lines S1, S2... Sm which lead respective outputs from the lower transparent electrodes 12 belonging to the same column out in common. The lower transparent electrodes 12 are connected between the corresponding row select lines Y1, Y2... Yn and sense lines S1, S2... Sm.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device having a coordinate detecting function, and more particularly to an active matrix type liquid crystal display device having a coordinate detecting function.

[0002]

2. Description of the Related Art An example of a conventional coordinate position detecting function of an active matrix type liquid crystal display device will be described with reference to FIG.

[0003] Generally, in a small portable terminal,
A coordinate position detecting device called a touch panel 31 is arranged at a predetermined interval by using a spacer 32 on the front surface of an LCD 33 for display.

As shown in FIG. 11, the structure of the touch panel 31 uses a spacer 36 to prevent the upper electrode 35 and the lower electrode 37 from contacting each other at a predetermined interval. When touched by the pen 34, the upper electrode 35 and the lower electrode 37 come into contact with each other, and a current can be supplied.

[0005] As shown in FIG.
Parallel electrodes 39 and 40 are provided on both sides of a conductive material called a transparent resistive film 41, and when a voltage (E) is applied thereto, a potential gradient is created between the electrodes. Here, since the resistance value of the resistive film is uniform, the potential gradient becomes a straight line, and the relationship between the distance and the voltage becomes a linear expression. Then, the voltage of the input point B is detected by the upper electrode, and X is obtained by using the A / D converter.
The position in the axial direction can be detected.

Next, the voltage (E) is applied to the upper electrode, and the voltage is detected by the lower electrode to detect the position in the Y-axis direction. Then, by repeating the above processing in a short cycle by the time division circuit, the input positions of the X and Y axes can be detected.

On the other hand, in the technique described in Japanese Patent Application No. Hei 7-195640, a circuit as shown in FIG. In order to correct the detection error caused by the error, cross marks are displayed at three places of the liquid crystal display device 42, and the voltage between the HP-HG terminal and the VP-
By monitoring the voltage between the VG terminals, it is detected which cross mark the operator has touched.

When the operator touches all the cross marks, the voltage correction value in the X-axis direction of the touch area is stored in the EEPROM 45, and thereafter, when the operator touches the touch panel, the CPU 43 executes the operation.
The position shift is corrected by reading the voltage correction value and detecting the touched coordinate position.

In the technology described in Japanese Patent Application No. Hei 6-105350, for example, when the voltage applied to the touch panel is reduced due to the consumption of the battery power or the electrical characteristics of the touch panel itself change over time, Even if you touch the same position of, in order to prevent the output voltage from being different and the coordinate position shift from occurring,
The data of the touch panel when a predetermined display pattern frequently displayed on the liquid crystal display screen is touched is sequentially stored in the storage device, and the displacement of the coordinates is corrected based on the change.

Further, in the technique described in Japanese Patent Application No. 4-308756, a circular pen cursor 47 having a large area is displayed on a liquid crystal display portion at a coordinate position where the touch panel is touched by a pen 48 as shown in FIG. Is displayed, and the pen cursor 47 is moved in conjunction with the movement of the pen when the pen is moved, so that the arrow tip 46 is used as the original movement target, and the precision can be adjusted without performing a strict alignment of the touch panel. It is configured such that a high coordinate input can be performed.

Also, in the technique described in Japanese Patent Application No. 2-144401, a display for coordinate positioning is displayed on the screen and touched by the operator, as in the case of Japanese Patent Application No. 7-195640. The coordinate position is corrected by having the user receive it.

[0012]

However, in the above-mentioned conventional liquid crystal display device having a coordinate detection function, it is necessary to dispose the touch panel on the front surface of the liquid crystal display device. Needs to be adjusted to correct the error. In addition, misalignment occurs due to individual differences in the mounting position of the touch panel, changes in the resistance value of the resistive film due to manufacturing errors and aging of the touch panel, and changes in the voltage applied to the resistive film of the touch panel. This requires the operator to perform this operation.

Further, in the above liquid crystal display device, the touch panel for coordinate detection and the liquid crystal display device are separate devices, and a space between the liquid crystal display device and the touch panel is required. In this case, there is a problem that the device becomes thicker and larger.

In view of the above, the present invention has been made in view of the above-mentioned problems in the conventional liquid crystal display device having a coordinate detection function, and does not require coordinate alignment and can reduce the thickness of the device. It is an object of the present invention to provide a liquid crystal display device having a coordinate detection function that can be reduced in size and weight.

[0015]

According to the first aspect of the present invention,
A liquid crystal display device with a coordinate detection function, wherein a liquid crystal display matrix portion in which display elements corresponding to one pixel of the liquid crystal display are arranged in a matrix.
A row selection line for selecting each display element of the liquid crystal display matrix portion, an upper transparent electrode disposed on the front surface of the liquid crystal display, and a position corresponding to the display element; A lower transparent electrode for detecting a contact state, and a sense line that commonly derives each output from the lower transparent electrode belonging to the same column, between the corresponding row selection line and the corresponding sense line. Each of the lower transparent electrodes is connected.

According to a second aspect of the present invention, there is provided a control means for sequentially selecting the row selection line alternatively, and according to each output of the sense line and a selection state of the row selection line during selection control.
And a position detecting means for detecting the position of the portion where the transparent electrode is pressed down and in contact with the position detecting electrode.

According to the present invention, the coordinate detection function is realized by the fact that the upper transparent electrode and the lower transparent electrode for detecting the coordinate position arranged for each pixel of the liquid crystal display are in contact with each other. It is possible to detect the contacting pixel. Here, it can be determined that the screen is being pressed by determining whether the two electrodes are in the on state where they are in contact or the off state where they are not in contact. For this reason, an accurate coordinate position can be detected without performing coordinate alignment required for a touch panel individual difference or an attachment position error.

[0018]

Next, a specific example of an embodiment of a liquid crystal display device with a coordinate detecting function according to the present invention will be described with reference to the drawings.

FIG. 1 shows a liquid crystal display device having a coordinate detecting function according to the present invention (hereinafter referred to as "liquid crystal display device").
FIG. 2 is a diagram showing a liquid crystal display panel used for a liquid crystal display panel. The liquid crystal display panel 8 includes row (gate) selection lines Y1, Y2,..., Yn, and columns (signals).
, Xm, and display cells P11, P12,..., Pnm as display elements 21 corresponding to one pixel disposed at each intersection of these lines (P1 in FIG.
1 is shown). Here, since each display cell has the same configuration, only the display cell P11 will be described, and the description of the other display cells will be omitted.

A display cell P11, which is one pixel of the liquid crystal display panel 8, includes a display pixel Q11 and a lower transparent electrode portion D.
11.

The display pixel Q11 includes a transistor T11 and a liquid crystal section L11. The source of the transistor T11 is connected to the column line X1, and the gate is connected to the row selection line Y1. The liquid crystal unit L11 is provided between the drain of the transistor T11 and the common electrode G.

On the other hand, the lower transparent electrode D11 is composed of two electrodes D11a and D11b.
Represents the row selection line Y1, and the lower transparent electrode D11b represents the sense line S.
1 connected. The sense line S1 is connected to the column line X1.
, S1, S2,
, Sm are provided corresponding to X1, X2, ..., Xm, respectively.

This sense line S1 is common to the lower transparent electrodes D11, D21,... Dn1 belonging to that column (first column), and detects the contact state of each transparent electrode in that column (first column). It is a line to do.

As shown in FIG. 2, a spacer 2 is disposed on the front surface of a liquid crystal display unit 3 having a coordinate detecting function, and an upper transparent electrode 1 is disposed thereon. The liquid crystal display unit 3 is configured so as not to contact with the liquid crystal display unit 3.

FIG. 3 is an overall view showing one embodiment of the liquid crystal display device according to the present invention, and is a block diagram including peripheral circuits of the liquid crystal display panel 8 shown in FIG. A display controller 4 connected to the liquid crystal display panel 8 via a gate driver 7; a display memory 5 and a source driver 6 disposed between the display controller 4 and the liquid crystal display panel 8; And a coordinate position calculation circuit 11.

Next, the operation of the liquid crystal display device having the above configuration will be described with reference to the drawings.

As shown in FIG. 4A, the upper transparent electrode 1
Is not pressed by the pen, the lower transparent electrodes D11a and D11b and the upper transparent electrode 1 are not in contact with each other, so that no current flows. However, as shown in FIG. When pressed, the lower transparent electrodes D11a and D11b come into contact with the upper transparent electrode 1, and Y1 and S1 in FIG. 1 are energized.

Here, a method for detecting the position where the upper transparent electrode 1 and the lower transparent electrode 12 (D11, D12,...) Are in contact with each other is as follows.

In FIG. 3, a display controller 4 writes an address selection signal and display data to a display memory 5, supplies a row selection signal to a gate driver 7, and also sends a row selection signal to a coordinate position calculation circuit 11. Provides a row select signal.

The address selection signal and the display data of the display memory 5 are also supplied to the source driver 6. Data to be displayed on the liquid crystal display panel 8 is selected according to the information, and the data is displayed via the source driver 6. The column lines X1, X2,... Xm of the panel 8 are driven.

The row selection signal is supplied to the gate driver 7 and the row selection lines Y 1,
.. Yn are driven.

Thus, the liquid crystal display panel 8
Display data can be displayed on the display.

The row selection signal is also used as a selection signal for the lower transparent electrode 12 in the liquid crystal display panel 8, and is also input to a coordinate position calculation circuit 11 to generate a Y component of the coordinate position of the pen 9. Used. The output from the lower transparent electrode 12 of the sense lines S1, S2,... Sm is used as the X coordinate component of the pen 9.

When displaying on the liquid crystal display panel 8, the transistor T1 is applied to the row selection signal Y1.
1. Apply a voltage (for example, high level) sufficient to turn on T12, and apply a voltage (for example, low level) sufficient to turn off other row select lines.

By supplying data (for example, white at high level and black at low level) to be displayed to the column selection lines X1 and X2, a white or black screen can be displayed.

The lower transparent electrodes D11 and D for position detection
Reference numeral 12 denotes an energized state when pressed by the pen 9 or the like from the upper part and is in contact with the upper transparent electrode 1, and otherwise insulated. Therefore, the lower transparent electrode D11 is energized and the lower transparent electrode D12 is insulated. If the state is the sense line S1
, The voltage of Y1 is output, and nothing is output to S2.

Therefore, by repeatedly performing the operation of sequentially setting the row selection lines Y1, Y2,... Yn to a selected state (for example, a high level state), if the voltages from the sense lines S1, S2. 9 can be determined.

The coordinate position calculation circuit 11 specifies the position coordinates (X, Y) of the position of the pen 9 by using the output signals of the sense lines S1, S2,... can do.

The lower transparent electrode, as shown in FIG.
Although arranged like the lower transparent electrode a13 and the lower transparent electrode b14, the size of one pixel can be reduced by arranging the lower transparent electrode a15 and the lower transparent electrode b16 as shown in FIG. It is.

In the case of a color liquid crystal display panel, as shown in FIG.
L11, green display liquid crystal GL11, blue display liquid crystal BL11
However, even in this case, it is possible to detect the coordinates by arranging the lower transparent electrodes a17 and b18. In addition, as shown in FIG. 8, one pixel can be reduced by disposing the lower transparent electrode a19 and the lower transparent electrode b20.

In the case of a color liquid crystal display, a color is represented by a combination of ON and OFF of red, green, and blue display pixels existing in one pixel.

At this time, as shown in FIG. 1, when the lower transparent electrodes D11 and D12 for position detection are pushed from above by a pen or a finger or the like and are in contact with the upper transparent electrode 1, the current is turned on. Otherwise, it is insulated.

Therefore, if the lower transparent electrode of D11 is in the conducting state and D12 is in the insulating state, the voltage of Y1 is outputted to the sense line S1 and nothing is outputted to S2.

Therefore, by repeatedly performing the operation of sequentially setting the row selection lines Y1, Y2,... Yn to a selected state (for example, a high level state) to detect the voltages from the sense lines S1, S2,. 9 (FIGS. 3 and 4) can be determined.

As shown in FIG. 3, the coordinate position calculating circuit 11
Then, the position coordinates (X, Y) of the position of the pen 9 can be specified by using the output signals of the sense lines S1, S2,...

In the case of a color liquid crystal display, as shown in FIGS. 7 and 8, one lower transparent electrode 17, 18, or 19, 20 for detection is provided for three elements of red, green, and blue.
, And the coordinate position is detected by detecting the output from the sense lines S1, S2,... Sm from the coordinate position detecting receiver 30 and calculating by the coordinate position calculating circuit 11, as in the case of the monochrome liquid crystal. Can be.

Next, when the accuracy of the coordinate position is required to be higher than the resolution of the display pixel on the screen for character recognition or the like, a configuration as shown in FIG. 9 can be considered.

In FIG. 7 and FIG. 8, the lower transparent electrode for detection is arranged one-to-one with respect to one pixel constituted by red, green and blue display elements of color liquid crystal. The coordinates can be detected only at the same resolution as the display pixels on the screen.

For example, in the case of a color liquid crystal display of 640 (horizontal) × 480 (vertical), the resolution of the coordinate position detection is 6 horizontal.
Although only a resolution of 40 × 480 in the vertical direction can be detected, by disposing a lower transparent electrode for detection for each of the red, green and blue surface elements as shown in FIG. 9, if the pixel configuration of FIG. The coordinate position can be detected with double precision.

[0050]

As described above, according to the present invention,
A lower transparent electrode for coordinate detection is arranged for each pixel, and it is determined whether or not the electrode is connected to the upper transparent electrode. This eliminates the need for coordinate alignment and eliminates the need for coordinate alignment. In addition, since the touch panel and liquid crystal display can be integrated, the thickness of the device can be reduced, and the coordinate position detection function can be reduced in size and weight. The present invention can provide a liquid crystal display device provided with the same.

[Brief description of the drawings]

FIG. 1 is a diagram showing an equivalent circuit of a liquid crystal display panel used in a liquid crystal display device according to the present invention.

FIG. 2 is a schematic sectional view of the liquid crystal display panel of FIG.

FIG. 3 is a block diagram showing an overall configuration of a liquid crystal display device according to the present invention.

FIGS. 4A and 4B are schematic diagrams for explaining that the upper transparent electrode contacts the lower transparent electrode when the upper transparent electrode is pressed in the liquid crystal display panel of FIG. 1; FIG. (B) shows a pressed state.

FIG. 5 is a schematic diagram showing one pixel of the liquid crystal display panel of FIG.

FIG. 6 is a schematic diagram showing a case where one pixel of the liquid crystal display panel of FIG. 1 is miniaturized.

FIG. 7 is a schematic view showing one pixel of a color liquid crystal display panel used in the liquid crystal display device according to the present invention.

8 is a schematic diagram showing a case where one pixel of the color liquid crystal display panel of FIG. 7 is downsized.

FIG. 9 is a schematic diagram for explaining one pixel having improved detection accuracy of a color liquid crystal display panel used in the liquid crystal display device according to the present invention.

FIG. 10 is a schematic view showing an example of a conventional liquid crystal display panel with a touch panel.

FIG. 11 is a schematic diagram showing a state in which an upper transparent electrode of a conventional liquid crystal display panel with a touch panel is pressed.

12A and 12B are diagrams illustrating an example of a conventional touch panel coordinate position detection method, in which FIG. 12A is a circuit diagram, and FIG. 12B is a diagram illustrating a relationship between a position of a detection point and a voltage.

FIG. 13 is a block diagram illustrating an example of a coordinate position detection circuit of a conventional touch panel.

FIG. 14 is a schematic view showing an example of a conventional cursor for detecting a coordinate position.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper transparent electrode 2 Spacer 3 Liquid crystal display part 4 Display controller 5 Display memory 6 Source driver 7 Gate driver 8 Liquid crystal display panel 9 Pen 10 Coordinate position detection receiver 11 Coordinate position calculation circuit 12-20 Lower transparent electrode 21 Display element

Claims (2)

[Claims]
1. A liquid crystal display matrix section in which display elements corresponding to one pixel of a liquid crystal display are arranged in a matrix, a row selection line for selecting each display element of the liquid crystal display matrix section, and the liquid crystal. An upper transparent electrode disposed on the front surface of the display; a lower transparent electrode disposed at a position corresponding to the display element, for detecting a contact state with the upper transparent electrode; and Wherein each of the lower transparent electrodes is connected between a corresponding row selection line and a corresponding sense line, the liquid crystal display device having a coordinate detecting function. .
2. A control means for sequentially selecting one of the row selection lines, and the transparent electrode is depressed in accordance with each output of the sense line and a selection state of the row selection line during selection control. 2. The liquid crystal display device with a coordinate detecting function according to claim 1, further comprising a position detecting means for detecting a position of a portion in contact with the position detecting electrode.
JP26607598A 1998-09-21 1998-09-21 Liquid crystal display device with coordinate position detecting function Withdrawn JP2000099268A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP26607598A JP2000099268A (en) 1998-09-21 1998-09-21 Liquid crystal display device with coordinate position detecting function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP26607598A JP2000099268A (en) 1998-09-21 1998-09-21 Liquid crystal display device with coordinate position detecting function

Publications (1)

Publication Number Publication Date
JP2000099268A true JP2000099268A (en) 2000-04-07

Family

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Family Applications (1)

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Country Status (1)

Country Link
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007226217A (en) * 2006-02-20 2007-09-06 Samsung Electronics Co Ltd Liquid crystal display panel, liquid crystal display apparatus having the same, and method for preventing deterioration of display quality of the liquid crystal display apparatus having touch screen function
JP2008191671A (en) * 2007-02-07 2008-08-21 Samsung Electronics Co Ltd Liquid crystal display panel and method for manufacturing the same
US7649578B2 (en) 2007-01-22 2010-01-19 Samsung Electronics Co., Ltd. Array substrate and display panel having the same with particular sensor electrodes
WO2010095293A1 (en) * 2009-02-18 2010-08-26 シャープ株式会社 Touch panel provided with built-in display device
US7889183B2 (en) 2005-08-29 2011-02-15 Samsung Electronics Co., Ltd. Liquid crystal display including sensing unit and image data line arrangement
US8068088B2 (en) 2007-02-12 2011-11-29 Samsung Electronics Co., Ltd. Display device with sensing units and driving method thereof
US8134535B2 (en) 2007-03-02 2012-03-13 Samsung Electronics Co., Ltd. Display device including integrated touch sensors
JP2012068405A (en) * 2010-09-22 2012-04-05 Casio Comput Co Ltd Liquid crystal display apparatus and touch panel
WO2013175721A1 (en) * 2012-05-21 2013-11-28 パナソニック液晶ディスプレイ株式会社 Liquid crystal display device
US8659564B2 (en) 2010-06-18 2014-02-25 Samsung Display Co., Ltd. Touch sensible display device having reduced number of image data lines
US9524068B2 (en) 2012-05-25 2016-12-20 Panasonic Liquid Crystal Display Co., Ltd. Liquid crystal display device

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7889183B2 (en) 2005-08-29 2011-02-15 Samsung Electronics Co., Ltd. Liquid crystal display including sensing unit and image data line arrangement
JP2007226217A (en) * 2006-02-20 2007-09-06 Samsung Electronics Co Ltd Liquid crystal display panel, liquid crystal display apparatus having the same, and method for preventing deterioration of display quality of the liquid crystal display apparatus having touch screen function
US7649578B2 (en) 2007-01-22 2010-01-19 Samsung Electronics Co., Ltd. Array substrate and display panel having the same with particular sensor electrodes
JP2008191671A (en) * 2007-02-07 2008-08-21 Samsung Electronics Co Ltd Liquid crystal display panel and method for manufacturing the same
KR101385190B1 (en) * 2007-02-07 2014-04-15 삼성디스플레이 주식회사 Liquid crystal display and manufacturing method of the same
US8068088B2 (en) 2007-02-12 2011-11-29 Samsung Electronics Co., Ltd. Display device with sensing units and driving method thereof
US8134535B2 (en) 2007-03-02 2012-03-13 Samsung Electronics Co., Ltd. Display device including integrated touch sensors
US8531432B2 (en) 2009-02-18 2013-09-10 Sharp Kabushiki Kaisha Touch panel with built-in display device
WO2010095293A1 (en) * 2009-02-18 2010-08-26 シャープ株式会社 Touch panel provided with built-in display device
US8659564B2 (en) 2010-06-18 2014-02-25 Samsung Display Co., Ltd. Touch sensible display device having reduced number of image data lines
JP2012068405A (en) * 2010-09-22 2012-04-05 Casio Comput Co Ltd Liquid crystal display apparatus and touch panel
WO2013175721A1 (en) * 2012-05-21 2013-11-28 パナソニック液晶ディスプレイ株式会社 Liquid crystal display device
US9524068B2 (en) 2012-05-25 2016-12-20 Panasonic Liquid Crystal Display Co., Ltd. Liquid crystal display device

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Effective date: 20060110