JPH1195929A - Display unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive display unit provided with a multiple pressing function. SOLUTION: When output ports OUT1 and OUT2 are turned on by a control circuit part 5, transistors Q1 and Q2 are turned on, and a voltage Vx corresponding to the (x) coordinate of a pressed point on a touch panel 2 is inputted from a driving circuit part 6. When output ports OUT3 and OUT4 are turned on by the control circuit part 5, similarly, transistors Q3 and Q4 are turned on, and a voltage Vy corresponding to the (y) coordinate of a pressed point on the touch panel 2 is inputted from the driving circuit part 6. In accordance with the voltages Vx and Vy inputted from the driving circuit part 6, the control circuit part 5 finds the coordinates of the pressed point and performs tag processing corresponding to this point. When the pressed tag is a double point pressing tag, on the other hand, the control circuit part 5 detects the output voltages Vx and Vy from the driving circuit part 6 again and finds the coordinates of the second pressed point.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display using an analog touch panel.

[0002]

2. Description of the Related Art As this type of display, as shown in FIG. 4 (a), a liquid crystal display (LCD) is used to display an operation unit element for pressing operation on a liquid crystal screen using a liquid crystal display (LCD). 1 and a touch panel 2 that is arranged so as to be superimposed on the liquid crystal screen of the liquid crystal display unit 1 and that executes an operation of the operation unit element by pressing a portion corresponding to the operation unit element displayed on the liquid crystal screen. For example, a switch picture is displayed on the liquid crystal screen of the liquid crystal display unit 1 and the switch is operated by touching the picture of the switch with a hand or the like.

Here, as shown in FIG. 4B, the operation unit elements displayed on the liquid crystal screen of the liquid crystal display unit 1 include:
There are tags (attribute aggregates) 11a and 11b such as "@", "@", and "SHIFT" indicating the function of the displayed picture 10 in addition to the mere picture 10. For example, a picture indicating a switch and a tag indicating a function of the switch are displayed in a portion displaying the switch. When a portion of the touch panel 2 corresponding to the display position of the switch on the liquid crystal screen of the liquid crystal display unit 1 is pressed, the operation of the switch is performed.
By the way, the tags 11a and 11b include a tag operated alone and a tag operated together with another tag (such a tag is referred to as a multi-point pressed tag). For example, the shift (SHIFT) key 11a and the scroll keys (△, ▽) 11b are displayed on the liquid crystal display unit 1. When the scroll key 11b is pressed while the shift key 11a is being pressed, the screen moves upward ( When the user scrolls to (△) and presses only the scroll key 11b, the screen scrolls downward (▽).

[0004]

The touch panel 2 used in the display having the above-mentioned structure includes two types, a digital type and an analog type. Digital touch panel 2 '
As shown in FIG. 5, a plurality of transparent electrodes x ₁ , x ₂ ... _Xn arranged in parallel at a constant interval in the vertical direction and a plurality of transparent electrodes arranged in parallel at a constant interval in the horizontal direction. Transparent electrodes y ₁ and y
₂ ... and a y _n, the transparent electrode x ₁ ..., y ₁ ... are arranged in a matrix (e.g. 16 horizontal rows × vertical 12 rows). Here, when an arbitrary portion of the touch panel 2 'is pressed, the transparent electrodes x _1, ..., Y _1, ... Of the pressed portion become conductive, and the corresponding tag is operated. In the digital touch panel 2 ′, when a plurality of parts are pressed, the transparent electrodes x ₁ , y _1, ... Of the pressed parts become conductive at a plurality of places, so that a plurality of tags can be operated simultaneously.

On the other hand, the analog type touch panel 2
6 (a), two transparent rectangular resistance films 3,
4 are arranged in an overlapping manner. On two opposite sides of the resistive film 3
Is the electrode t₁, T_TwoAnd two opposite sides of the resistance film 4
Has an electrode t_Three, T_FourIs provided, and the electrode t₁, T_Two
Between the electrodes t_Three, T_FourA constant voltage is applied between each
ing. Here, one resistive film 3 has a resistance in the x-axis direction,
The other resistive film 4 has a resistance in the y-axis direction and is pressed.
The resistance value of the resistive film 3 changes linearly according to the x coordinate of the part
Then, an output voltage corresponding to the x coordinate of the pressed portion is applied to the electrode t.
_ThreeOr electrode t_FourOutput from Similarly, the pressed part
The resistance value of the resistance film 4 changes linearly according to the y coordinate of the position,
The output voltage corresponding to the y-coordinate of the pressed portion is applied to the electrode t.₁or
Is the electrode t _TwoOutput from Thus, the pressed part
Since the output voltage changes according to the x and y coordinates of the position,
The x-coordinate and y-coordinate of the part pressed from the output voltage change
You can ask.

By the way, a digital touch panel 2 '
Then, the transparent electrode x previously disposed on the pressed portion
₁ ..., because y ₁ ... conducts, a plurality of transparent electrodes x ₁ ... to the pressed portion, if y ₁ ... are disposed, there are a plurality of switches is operated, the analog-type If the touch panel 2 is pressed with a pen or the like, it is possible to detect only one pressed point. Therefore, a picture or the like is displayed on the liquid crystal screen of the liquid crystal display 1, and a part of the picture is pressed. Can be performed.

[0007] However, as shown in FIG.
Point P on the upper left of the analog type touch panel 2₁And the lower right point
P_TwoAnd at the same time, two points P₁, P_TwoMidpoint P_Three
The output voltage corresponding to the x coordinate of the electrode t_Three(T_Four) To output
And two points P₁, P_TwoMidpoint P_ThreeOutput according to the y coordinate of
Voltage is the electrode t₁(T_Two), So two points
P ₁, P_TwoMidpoint P_ThreeIs detected as being pressed,
2 points P₁, P_TwoTo detect that each is pressed
Could not.

[0008] Therefore, when the function of two-point pressing of simultaneously pressing two tags is frequently used, a digital touch panel 2 'is generally used. However, since the digital touch panel 2 'is more expensive than the analog touch panel 2, there is a problem that the cost of the display is increased. The digital touch panel 2 'has a plurality of transparent electrodes x ₁ ..., Y ₁ .
Are arranged in a matrix, so that there is also a problem that the boundary line between adjacent transparent electrodes (switch portions) may be noticeable in a lattice shape due to a difference in transmittance. further,
Since the setting coordinates of the switch are limited to the positions of the transparent electrodes x ₁ , y ₁ , arranged on the touch panel 2, there is also a problem that the position of the switch cannot be set to any coordinates of the touch panel 2. Was.

The present invention has been made in view of the above problems, and an object of the present invention is to provide an inexpensive display device having a two-point pressing function.

[0010]

In order to achieve the above object, according to the first aspect of the present invention, a liquid crystal display for displaying an operation unit element for performing a pressing operation on a liquid crystal screen, and a liquid crystal display unit. An analog touch panel that is arranged and that, when a portion corresponding to the operation unit element displayed on the liquid crystal screen is pressed, the resistance value changes according to the coordinates of the pressed portion,
Calculates the coordinates of the point pressed by the change in the resistance value of the touch panel, executes the operation of the corresponding operation element, and presses the pressed operation element together with other operation elements. In the case of a push operation unit element, a control circuit unit that calculates the coordinates of the point pressed after the second point and executes the operation of the corresponding operation unit element is provided. The coordinates of the two pressed points can be detected.

According to a second aspect of the present invention, in the first aspect of the present invention, the touch panel is configured by arranging two flexible rectangular resistance films facing each other, and alternately between two opposite sides of each resistance film. A driving circuit unit that applies a constant voltage to the control circuit unit and outputs an output voltage corresponding to the coordinates of the pressed point to the control circuit unit;
Since the control circuit calculates the coordinates of the pressed point from the output voltage of the drive circuit, the coordinates of the pressed point can be detected with a simple circuit configuration.

According to a third aspect of the present invention, in the second aspect of the present invention, when the operation unit element corresponding to the pressed point is a multipoint operation unit element, the control circuit unit presses the first one point. The coordinates of the first point are calculated from the output voltage of the drive circuit section in the pressed state, and the output voltage of the drive circuit section in the state where the next point is pressed simultaneously is calculated from the output voltage of the drive circuit section in the state where the next point is pressed simultaneously. The coordinates of the middle point of the one point pressed are calculated, and the coordinates of the next pressed point are calculated from the coordinates of the first point and the coordinates of the middle point. The coordinates of the point pressed second can be determined.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in the block diagram of FIG. 1, a display device of this embodiment is provided with a tag indicating a function set in advance by using a liquid crystal display element (LCD). A liquid crystal display 1 for displaying coordinates, and a liquid crystal display 1
When a part corresponding to the tag displayed on the liquid crystal screen of the touch panel is pressed, a touch panel 2 whose resistance value changes according to the coordinates of the pressed part, and a constant voltage is applied to the touch panel 2 so that the pressed part A drive circuit unit 6 that outputs a voltage value corresponding to the coordinates of the touch panel, controls a display on the liquid crystal display unit 1, detects a pressed position of the touch panel 2 from an output voltage of the drive circuit unit 6, and generates a tag corresponding to the pressed position. And a control circuit section 5 for executing the above function. The touch panel 2 has the same configuration as the touch panel 2 shown in FIG. 6 described above, and two transparent rectangular resistance films 3 and 4 are arranged in an overlapping manner. The electrodes t ₁ ,
t ₂ is provided, and electrodes t ₃ and t ₄ are provided on two opposing sides of the resistive film 4. The drive circuit unit 6 provides a connection between the electrodes t ₁ and t _{2 and a connection} between the electrodes t ₃ and t _4. A constant voltage is applied to each. Here, one resistance film 3 has a resistance in the x-axis direction, and the other resistance film 4 has a resistance in the y-axis direction.
The resistance value of the resistance film 3 is changed linearly with the x-coordinate of the pressed site, output voltage corresponding to the x-coordinate of the pressed site is output from the electrode t ₃ or the electrode t _4. Similarly, the resistance value of the resistive film 4 changes linearly according to the y coordinate of the pressed part, and an output voltage corresponding to the y coordinate of the pressed part is output from the electrode t ₁ or the electrode t ₂ .

The control circuit unit 5 has an R
An AM 52, a ROM 53 for storing an operation program and various parameters, a sample and hold circuit 55 for sampling an output voltage of the drive circuit unit 2 and holding the output voltage for a certain period of time,
A / D converter 54 for A / D converting the output voltage of sample-and-hold circuit 55, and arithmetic and control unit (CPU) 5 comprising, for example, a microcomputer for controlling the operation of each unit.
And 1. Since the A / D converter 54 A / D converts the input voltage with the number of bits corresponding to the number of transparent electrodes arranged on the digital touch panel 2 ′,
The coordinates of the pressed point can be detected with the same resolution as when the digital touch panel 2 'is used.

The drive circuit section 6 applies a constant voltage to a resistive film.
Transistor Q for applying alternately to 3, 4₁~
Q_Four, The output voltage according to the x and y coordinates of the pressed point
Buffer amplifiers for respectively outputting Vx and Vy to the control circuit unit 5
A₁, A_TwoEtc. Here, the control circuit section
Reference numeral 5 denotes a screen as an operation unit element on the liquid crystal screen of the liquid crystal display unit 1.
Displays a picture that indicates a switch or a tag that indicates the function of the picture.
And the voltage input from the touch panel 2
Then, the coordinates of the pressed part are calculated. For example, pressed
When detecting the x-coordinate of the part, the control circuit unit 5 outputs
Port OUT₁, OUT_TwoTurn on and sump
Input of buffer circuit 55 to buffer amplifier A ₁Cut to the side
Replace it. Output port OUT₁, OUT_TwoTurn on
In the drive circuit section 6, the transistor Q₁, Q_TwoIs on
Then, a constant voltage (for example, 5 V) is applied to the resistance film 3 in the x-axis direction.
Output voltage Vx according to the x-coordinate of the applied and pressed point
Is buffer amplifier A₁To the sample and hold circuit 55
Is output. The A / D conversion unit 54 performs a sample hold
A / D converts the voltage Vx input to the path 55
51 is the x-coordinate of the point pressed from the output of the A / D converter 54
Detect targets. Similarly, the y coordinate of the pressed part is detected
In this case, the control circuit unit 5 outputs the output port OUT_Three, OUT
_FourIs turned on, and the input of the sample hold circuit 55 is turned on.
Power buffer amplifier A _TwoSwitch to the side. Output port O
UT_Three, OUT_FourIs turned on, the drive circuit 6
Transistor Q_Three, Q_FourTurns on, and the resistance film 4 in the y-axis direction
When a constant voltage is applied, the output corresponding to the y-coordinate of the pressed point
When the input voltage Vy is equal to the buffer amplifier A_TwoSample hold from
The signal is output to the circuit 55. The A / D converter 54 is a sample
A / D converts the voltage Vy input to the hold circuit 55,
The CPU 51 detects the point pressed from the output of the A / D converter 54.
Is detected.

By the way, the analog type touch panel 2
When two different points are pressed, the two points pressed as described above
An output voltage corresponding to the coordinates of the middle point of the point is output from the drive circuit unit 6.
Is forced. For example, as shown in FIG.
Point P in the upper left of₁And the lower right point P _TwoPressing 2 points
P₁, P_TwoMidpoint P_ThreeVoltage corresponding to the coordinates of
You. By the way, 2 points P₁, P_TwoPress strictly
Is 2 points P₁, P_TwoIs pressed first,
Since the rear side is pressed, the control circuit 5
First, the sampling cycle of the output voltage of the unit 6 is increased,
Of the drive circuit section 6 in a state where only one point is pressed
Sample the voltage.

The operation of the control circuit unit 5 is shown in the flowchart of FIG.
Explanation will be made based on the chart. Here, the point P₁The coordinates of
(1,1), point P_TwoIs (7,5), and the point P
₁After pressing, point P_TwoIs pressed when
Will be explained. In step 21, the control circuit unit 5
The detection of the pressed position of the tunnel 2 is started. At this time, the control circuit
The first point P in part 5₁Output power only when pressed
The pressure is input from the drive circuit unit 6. First, the control circuit unit 5
The output voltage Vx in the x-axis direction of the drive circuit unit 6 is detected and
Pressed point P₁X coordinate (x₁) (Step
22). Next, the control circuit unit 5 controls the drive circuit unit 6 in the y-axis direction.
The output voltage Vy is detected, and the pressed point P₁Y coordinate of
(Y₁) (Step 23), and the pressed point P₁
Switch processing indicated by the tag corresponding to
24). Here, the control circuit unit 5 has two pressed tags.
Determine whether the tag is a push tag (step 25) and push two points
If the tag is not the tag of
Execution processing (step 30), and returns to step 21.
You. On the other hand, if the tag pressed is a two-point tag,
The control circuit 5 is at the point P_TwoCalculate the coordinates of
You. At this time, the control circuit section 5 has two points P from the drive circuit section 6.
₁, P_TwoMidpoint P_ThreeOutput power corresponding to the coordinates (4, 3)
Pressure is input. The control circuit unit 5 first controls the drive circuit unit 6
The output voltage Vx in the x-axis direction is detected, and the midpoint P_ThreeX coordinate of
(X_Three) (Step 26), and then the driving circuit unit 6
Of the output voltage Vy in the y-axis direction of _ThreeThe y seat
Mark (y_Three) Is calculated (step 27). And control
The circuit part 5 has a point P pressed first.₁Coordinates (1,
1) and 2 points P₁, P_TwoMidpoint P_Three(4,3) coordinates
Then, the point P pressed second by the following calculation_TwoCoordinates
(X_Two, Y _Two) Is obtained (step 28).

X ₂ = 2 × 4-1 = 7 y ₂ = 2 × 3-1 = 5 Then, the control circuit unit 5 obtains the coordinates (7, 5) of the point P ₂ pressed second. performs switching process indicated by the tag corresponding to the point P ₂ (step 29), the liquid crystal display unit 1
Executes main processing such as display control (step 3
0), and return to step 21.

As described above, the control circuit section 5 determines whether or not the pressed tag is a two-point pressed tag. If the pressed tag is a two-point pressed tag, the output voltage Vx of the drive circuit section 6 is determined. , V
From y, the coordinates of the middle point between the first pressed point and the second pressed point are detected, and then, from the coordinates of the first pressed point and the coordinates of the middle point, the second Since the coordinates of the pressed point are detected, the analog touch panel 2
Can be used to detect two-point pressing. still,
In the present embodiment, the case where two points are pressed at the same time has been described. However, even when three or more points are pressed at the same time, by repeating the above-described processing, the three or more points are pressed. Can be detected.

Since the analog touch panel 2 is less expensive than the digital touch panel 2 ', the cost of the display can be reduced. Furthermore, since the analog touch panel 2 is used, the boundary line between adjacent switch portions is not noticeable due to the difference in transmittance as in the digital touch panel 2 ′, and the position of the switch is a transparent electrode. , The switch can be set to any coordinates.

[0021]

As described above, according to the first aspect of the present invention, there is provided a liquid crystal display section for displaying an operation section element for performing a pressing operation on a liquid crystal screen, and the liquid crystal display section is provided so as to overlap the liquid crystal display section. When the part corresponding to the operation unit element displayed in is pressed,
An analog type touch panel whose resistance value changes according to the coordinates of the pressed part, and calculates the coordinates of the point pressed by the change in the resistance value of the touch panel to execute the operation of the corresponding operation element. In the case where the pressed operation unit element is a multi-point pressed operation unit element pressed together with other operation unit elements, the coordinates of the points pressed after the second point are calculated, and the corresponding operation unit element Since it has a control circuit unit for performing operations, even an analog type touch panel can detect the coordinates of two points pressed simultaneously,
There is an effect that an inexpensive display device having a two-point pressing function can be realized. Furthermore, since a digital touch panel is not used, the boundaries between adjacent switch portions are not noticeable due to the difference in transmittance, and the positions of the switches are not limited to the arrangement of the transparent electrodes. There is also an effect that can be set to.

According to a second aspect of the present invention, in the touch panel, two rectangular resistance films having flexibility are arranged to face each other,
A constant voltage is alternately applied between two opposing sides of each resistance film,
Since the driving circuit unit outputs an output voltage corresponding to the coordinates of the pressed point to the control circuit unit, and the control circuit unit calculates the coordinates of the pressed point from the output voltage of the driving circuit unit,
There is an effect that the coordinates of the pressed point can be detected with a simple circuit configuration.

According to a third aspect of the present invention, when the operation unit element corresponding to the pressed point is a multi-point operation unit element, the control circuit unit determines whether or not the first one of the drive circuit units is pressed. From the output voltage, the coordinates of the first one point are calculated, and from the output voltage of the drive circuit unit in a state where the next one point is simultaneously pressed, one point pressed first and one point pressed next are calculated. The coordinates of the middle point are calculated, and the coordinates of the next pressed point are calculated from the coordinates of the first point and the coordinates of the middle point. There is an effect that coordinates can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram of a display device according to an embodiment.

FIG. 2 is a diagram illustrating the operation of the above.

FIG. 3 is a flowchart showing the operation of the above.

4A and 4B show a conventional display, in which FIG.
(B) is a diagram showing a liquid crystal screen of a liquid crystal display unit.

FIG. 5 is a diagram showing a digital touch panel used in the embodiment.

FIGS. 6A and 6B show an analog type touch panel used in the embodiment; FIG. 6A is an external perspective view, and FIG.

[Explanation of symbols]

Second touch panel 5 the control circuit unit 6 driving circuit OUT ₁ to OUT ₄ output ports Q ₁ to Q ₄ transistor Vx, Vy voltage

Claims (3)

[Claims] 1. A liquid crystal display section for displaying an operation section element for performing a pressing operation on a liquid crystal screen, and a portion corresponding to the operation section element provided on the liquid crystal display section and displayed on the liquid crystal screen. When pressed, the analog type touch panel whose resistance value changes according to the coordinates of the pressed part, and calculates the coordinates of the point pressed by the change in the resistance value of the touch panel, and calculates the corresponding operation unit element When an operation is performed and the pressed operation unit element is a multi-point operation unit element that is pressed together with another operation unit element, the coordinates of the points pressed after the second point are calculated, and And a control circuit unit for executing an operation of the operation unit element. 2. A touch panel comprising two rectangular resistive films each having flexibility and opposed to each other. A constant voltage is alternately applied between two opposing sides of each resistive film, and a touch point is determined. The display according to claim 1, further comprising a drive circuit unit that outputs an output voltage corresponding to the coordinates to the control circuit unit, wherein the control circuit unit calculates coordinates of the pressed point from the output voltage of the drive circuit unit. 3. When the operating element corresponding to the pressed point is a multi-point operating element, the control circuit determines the first voltage from the output voltage of the driving circuit in the state where the first point is pressed. Of 1
The coordinates of the point are calculated, and the coordinates of the middle point between the first pressed point and the next pressed point are calculated from the output voltage of the drive circuit unit in a state where the next point is pressed simultaneously. And
From the coordinates of the first point and the coordinates of the middle point, the next pressed 1
3. The display according to claim 2, wherein coordinates of the point are calculated.