JPH11119913A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress power consumption, while adding interest to a product by utilizing the light of a back light. SOLUTION: The presence/absence of a pen input is discriminated (step D5) and when there is a pen input, it is discriminated whether it is accompanied by movement of the pen or not (step D6). When it is accompanied with a movement, the electroluminescence(EL) element of that moving track trace is turned on (step D7). Furthermore, it is discriminated whether input data show a 'circle' or not (step D9), and when they show the 'circle', a back light inside the circle is turned on (step D13). When there is no pen input as a result of discrimination in the step D6, namely when a screen part is continuously pressed with a pen, the back light is turned on while being spread in a waveform (step D15) and finally, an EL panel is turned over the entire surface (step D16).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device having a screen having a backlight.

[0002]

2. Description of the Related Art Today, a large number of devices having a screen having a backlight, such as a pager and an electronic organizer, have appeared. In these various devices, the backlight is generally turned on at the time of display on the screen, and is turned off at the end of the display.

[0003]

As described above, in the prior art, since the backlight is simply turned on and off, the entire backlight is only turned on or turned off. Can not occur. In addition, an unnecessary portion of the screen may be illuminated by full lighting, which consumes power and shortens the battery life.

[0004] The present invention has been made in view of such a conventional problem, and a display device capable of suppressing power consumption while adding interest to a product by using light of a backlight. It is intended to provide.

[0005]

According to the present invention, there is provided a display device having a screen having a backlight, wherein the backlight is formed by a collection of elements which can individually control blinking of the backlight. And detecting means for detecting a touch on the screen, and control means for controlling the element in response to the detection of the touch by the detecting means and lighting the backlight in a predetermined pattern. I have. Therefore, while the visual sense is stimulated by the pattern in which the backlight is lit, and the fun is generated,
Power consumption due to full backlight lighting is avoided.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a pager. As shown in FIG. 1, the pager 10 has a device main body 11 composed of a flat rectangular box.
have. On the upper surface of the device main body 11, a screen unit 1 is provided.
2 and a key input unit 13 composed of a plurality of keys. The device body 11
Is provided with a pen storage portion 14 which is opened on the side surface, and a pen 15 is detachably fitted in the pen storage portion.

FIG. 2 shows a circuit configuration of the pager 10. The screen section 12 includes a lowermost EL (electroluminescence) panel 16 and an
Liquid crystal panel 17 and touch panel 1 sequentially laminated on 6
8. The EL panel 16 includes a large number of EL elements 16a arranged in a matrix, as disclosed in, for example, JP-A-3-71111 and JP-A-4-368826. When each EL element 16a is individually driven, it is possible to emit light in various light emission modes.
The liquid crystal panel 17 is, for example, a TFT (thin film transistor).
A switch matrix stacked type is used, and is driven by a liquid crystal panel drive circuit 20.

The touch panel 18 has an upper layer resistive film RS1 corresponding to the display area of the liquid crystal panel 17 and a lower layer lower resistive film RS2 laminated thereon.
A voltage terminal Vcc is connected to one end in the direction via a gate S1, and a ground terminal is connected to the other end in the X direction via a gate S2. On the other hand, the voltage terminal Vcc is connected to one end in the Y direction of the lower resistance film RS2 via a gate S3, and the ground terminal is connected to the other end in the Y direction via a gate S4.

Therefore, when a certain point on the upper resistive film RS1 is pressed, the voltage is divided in the X direction of the upper resistive film RS1 in response to the application of the voltage Vcc to the upper resistive film RS1 via the gates S1 and S2. The obtained voltage signal Vxout is derived from the other end of the lower resistance film RS2 and supplied to the A / D converter 21. Further, the gate S is formed on the lower resistance film RS2.
3, when the voltage Vcc is applied via S4,
A voltage signal Vyout obtained by dividing the resistance of the lower resistance film RS2 in the Y direction is derived from the other end of the upper resistance film RS1 and A /
The resistance film R is supplied to the D converter 21.
Voltage signals Vxout, Vy derived from S1 and RS2
out is the X direction with respect to the touch panel 18 and Y is the
Direction of the voltage signal Vx.
The input coordinates corresponding to the pressed point on the touch panel 18 are detected by A / D converting out and Vyout and converting them into XY coordinates. The A / D converter 21
Extraction terminal Vx of X-direction voltage signal Vxout at
in and the extraction terminal V of the Y-direction voltage signal Vyout
Yin is connected with a resistor R between itself and a ground terminal in order to maintain a high impedance state when there is no signal. Gates S5 and S6 are interposed between the gate and the ground terminal.

The CPU 22 controls the operation of each of the gates S1 to S6 via a decoder 24 based on an input coordinate detection program stored in the ROM 23 in advance, and
The XY coordinates corresponding to the pressed position on the touch panel 18 are obtained according to the X-direction voltage value and the Y-direction voltage value extracted via the D converter 21. CPU 22
The key input unit 13, the EL panel driving circuit 19 and the liquid crystal panel driving circuit 20, an RF unit 26 having a communication function required for a pager, a phototransistor 27 used in another embodiment described later, and an RA
M28 is connected. The CPU 22 is stored in advance in the ROM 23 together with the input coordinate program.
Based on a communication control program, an EL panel driving program, a liquid crystal panel driving program, and the like, the respective parts such as the EL panel driving circuit 19, the liquid crystal panel driving circuit 20, and the RF unit 26 are controlled while using the RAM 28 as a work area.

Next, the operation of the present embodiment according to the above configuration will be described with reference to the flowcharts shown in FIG.
That is, in the power-on state, the CPU 22
After performing a touch position detection process (step A1) and an EL control process (step A2), which will be described later, an LCD control process (step A1)
3) is executed, and the liquid crystal panel driving circuit 20 is controlled in accordance with the detected touch position to display characters on the liquid crystal panel 17. Further, after controlling the RF unit 26 to execute necessary communication control processing as a pager (step A4), other necessary processing is executed (step A5).
As long as the power-on state continues, the loop of steps A1 to A5 is repeated.

The touch position detection processing (step A1)
Is performed according to the flowchart shown in FIG.
22, the gates S1 and S2 are turned on via the decoder 24, and the voltage Vcc is applied to the upper resistance film RS1 in the X direction.
Is applied (step B1). At the same time, the gate S5 is turned on for a certain time via the decoder 24, and the X-direction voltage signal Vxou from the other end of the lower resistance film RS2 to the X signal extraction terminal Vxin of the A / D converter 12 is turned on.
Electricity existing in the path system for extracting t is discharged to ground (step B2). That is, the X-direction voltage signal Vxou
The residual electric quantity in the circuit system for extracting t is released, and thereafter, the voltage value in the X direction is read through the A / D converter 21 (step B3). As a result, x at the position where the pen 15 touches the touch panel 18 on the screen unit 12
Coordinates are accurately detected without an error caused by the residual amount of electricity.

Subsequently, the gates S3 and S4 are turned on from the CPU 22 via the decoder 24, and the lower resistance film RS
(Step B)
4). At the same time, the gate S6 is turned on for a predetermined time via the decoder 24, and the Y signal extraction terminal Vyin of the A / D converter 12 is connected to the other end of the upper resistive film RS1.
Is discharged to the ground in the path for extracting the Y-direction voltage signal Vyout (step B5). That is, the amount of residual electricity in the circuit for extracting the X-direction voltage signal Vxout is released, and then the A / D converter 2
A voltage value in the Y-direction is read via 1 (step B6).
Thus, the y coordinate of the position where the touch panel 18 is touched on the screen unit 12 by the pen 15 is accurately detected without an error caused by the residual amount of electricity.

The EL control process (step A2) is performed according to the flowchart shown in FIG. 5, and the touch position (x, y) detected in the above-described touch position detection process and the EL are processed.
An EL element 16a to be lit is calculated based on the lighting pattern (step C1). Here, the lighting pattern is
For example, the EL panel 16 is lit in a ripple shape or a ripple shape from the touch position, or is lit in a predetermined shape from a touch position in a predetermined range. And this step C
In step 1, the EL element 16a at a position to be driven when the EL panel 16 is turned on with these patterns is calculated,
Subsequently, in step C2, the calculation result is output to the EL panel drive circuit 19.

Then, the EL panel drive circuit 19 includes a CPU
EL panel 16 based on the calculation result input from
Are driven. Thus, when the lighting pattern has a ripple shape, the EL panel 16 lights in a ripple shape from the touch position T (x, y) as shown in FIG. Is rippled, the EL panel 16 is lit in a rippled manner from the touch position T (x, y), as shown in FIG. Further, when the lighting pattern is to light a predetermined range from the touch position in a star shape, FIG.
As shown in the figure, the EL panel 16 is touched at the touch position T (x,
Partially illuminate in a star shape around y). Therefore, these lighting patterns can stimulate the user's sight to generate interestingness during use, and also avoid power consumption due to full lighting.

FIG. 7 shows a processing procedure of the CPU 22 according to another embodiment of the present invention. That is, when a touch on the touch panel 18 is detected, the power is turned on (step D1), and then the RF unit 26 is controlled to form a normal incoming call waiting state (step D2). Next, based on the input from the phototransistor 27, the surrounding brightness is detected and the brightness is determined (step D).
3). If the surroundings are bright, the process proceeds to step D5 without performing the process of step D4. If the surroundings are dark, the EL panel driving circuit 19 is operated to operate the corresponding EL.
The element 16a is turned on, and a frame indicating the character input section is displayed on the EL panel 16 (step D4). Therefore, as shown in FIG. 8A, when the screen section 12 is touched with the pen 15, the power is turned on. If the surroundings are dark at this time, the character input section 30 is displayed as a frame.
Therefore, even when the character input is to be performed in a dark place, the character input by the pen 15 can be started without any trouble by clearly indicating the character input unit 30.

Next, it is determined whether or not there is a pen input (step D5). If there is a pen input, it is determined whether or not the pen input involves movement of the pen 15 (step D6).
If the movement is involved, the EL element 16a of the movement trace is turned on (step D7). Therefore,
As shown in FIG. 8B, when the pen 15 is moved while touching the character input unit 30 to input the hiragana "i", the movement locus of the pen 15 is turned on. Further, the processing from step D5 to step D8 is repeated until the pen input is completed.
8 to step D9. The determination as to whether or not the pen input in step D8 has been completed is made on the screen unit 12
This is performed depending on whether or not a predetermined time has elapsed since the detection of the touch on is stopped.

Then, when the pen input is completed, it is determined whether or not the input data is "circle" (closed loop) (step D9). If the input data is data other than a circle, the input character is recognized. (Step D10). Then, after moving the recognized input character to the first line (step D1)
1) The backlight (EL element 16)
The lighting of a) is ended (step D12). Therefore, as shown in FIG. 8C, when the input of the hiragana "i" in the character input section 30 is completed, the character is recognized and then moved to the first line as shown in FIG. Input unit 30
Characters inside are erased. Further, the process returns from step D12 to step D5, and by repeating the processing from step D5, the character entered in the character input section 30 is recognized while being clearly shown by the lighting of the EL element 16a, and the screen section is recognized. It is listed at the top of 12.

On the other hand, if the result of determination in step D9 is that the input data is a "circle", the backlight (EL element 16a) inside the circle is turned on (step D13),
When a predetermined time (for example, 6 seconds) elapses thereafter (step D14), the lighting of the backlight is ended (step D12). Therefore, as shown in FIG. 9 (A), when a circle 31 is input to the upper right side of the screen unit 12 with the pen 15, the inside of the circle 31 continues to light for a predetermined time as shown in FIG. 9 (B). Therefore, when a clock is displayed on this portion of the screen unit 12, if a circle surrounding the portion is drawn by the pen 15, with the lighting inside the circle,
As shown in FIG. 9B, even when the time rises and the place is dark, it is desirable that the lighting area of the EL panel 16 be reduced as much as possible to suppress the power consumption and be displayed on the screen unit 12. Can be clearly recognized.

In this embodiment, it is determined in step D9 whether or not the input data is "circle".
Although the inside is turned on, it may be determined whether or not it is a “closed loop”, and if it is a closed loop, the inside may be turned on. Thus, when a polygon such as a triangle or a quadrangle, or a closed loop of an unspecified shape is input with a pen, the inside of the closed loop is turned on.

If the result of determination in step D 6 is that there is no movement of the input pen, that is,
When the button 2 is continuously pressed (for example, when the button 2 is pressed for 3 seconds or more), the backlight (EL panel 16) is turned on while spreading like a ripple (step D15). Is turned on (Step D1)
6). Thereafter, when a predetermined time (for example, 6 seconds) elapses (step D17), the entire lighting of the EL panel 16 is terminated (step D12). Therefore, FIG.
When an arbitrary point P on the screen section 12 is continuously pressed with the pen 15 as shown in FIG. 0 (A), the EL panel 16 lights in a ripple shape around this point as shown in FIG. . Thereafter, the entire state is turned on as shown in FIG. 9C, and after a predetermined time has elapsed, as shown in FIG. And returns to step D5.

When the process from step D5 is repeated, if there is no pen input for a predetermined time or more (a time longer than the predetermined time used for determination in step D8), the process according to this flowchart is terminated. And step D
The normal incoming call waiting state formed in step 2 is continued.

In the embodiment, the pen 15 is used to detect the touch.
The same control may be performed by detecting a touch of something other than 5. Further, the light emission pattern of the EL panel 16 that emits light in response to the detection of a touch is not limited to that described in the above-described embodiment, and may be another pattern.

In addition to the pager, there can be a large number of application devices such as communication devices such as PHS, information devices such as electronic notebooks, PDAs and personal computers, and image devices such as liquid crystal televisions and cameras with display devices.

[0025]

As described above, according to the present invention, the backlight is turned on in a predetermined pattern in response to the touch on the screen. In addition, it is possible to add interest to a product having a screen having a backlight. Further, it is possible to avoid power consumption due to the full lighting of the backlight, and thus it is possible to suppress power consumption while adding interest to the product.

Further, by making the backlight an EL panel composed of an aggregate of EL elements, it is possible to add interest to the product and reduce power consumption at low cost.
By controlling the elements constituting the backlight in accordance with the surrounding light and shade, power consumption can be reduced without affecting visibility. Furthermore, by turning on the elements on the track touched, clear display of input characters is possible while minimizing power consumption. in addition,
When the trajectory of the touch is in a closed loop, by lighting the elements located in the loop, it is possible to easily illuminate only a necessary portion.

[0027]

[Brief description of the drawings]

FIG. 1 is an external perspective view of a pager according to an embodiment of the present invention.

FIG. 2 is a diagram showing a circuit configuration of the pager.

FIG. 3 is a general flow chart showing a processing procedure of a CPU.

FIG. 4 is a flowchart illustrating a procedure of a touch position detection process.

FIG. 5 is a flowchart illustrating a processing procedure of an EL control process.

FIG. 6 is a diagram showing a lighting example in the present embodiment.

FIG. 7 is a flowchart showing a processing procedure of a CPU according to another embodiment of the present invention.

FIG. 8 is a transition diagram of display change at the time of character input.

FIG. 9 is a display change transition diagram when a circle is input.

FIG. 10 is a display change transition diagram when the input pen is not moved.

[Explanation of symbols]

 12 screen section 15 pen 16 EL panel 16a EL element 17 liquid crystal panel 18 touch panel 22 CPU

Claims (5)

[Claims] 1. A display device provided with a screen having a backlight, wherein the backlight is constituted by an aggregate of elements capable of individually controlling blinking, and a detecting means for detecting a touch on the screen; Control means for controlling the element in response to the detection of the touch by the means, and lighting the backlight in a predetermined pattern. 2. The display device according to claim 1, wherein the backlight is an EL panel including an aggregate of EL elements. 3. The display device according to claim 1, further comprising detection means for detecting surrounding light and shade, wherein said control means controls said element according to a detection result of said detection means. 4. The display device according to claim 1, wherein the control unit turns on the element located on the locus of the touch detected by the detection unit. 5. The display device according to claim 1, wherein the control unit turns on the element located in the loop when the touch trajectory detected by the detection unit has a closed loop shape.