JPH03198124A - Information display device - Google Patents

Abstract

PURPOSE:To improve the drawing operability of an information display device by inhibiting the drawing operation if the quantity of light detected by a light pen does not reach a prescribed level when the characters, etc., are drawn with use of a photodetecting means like a light pen, etc. CONSTITUTION:A photodetecting means 6 is provided to detect the light received from a display screen together with a light quantity deciding means 8 which decides the quantity of detected light, and a position deciding means 7 which decides the position of the means 6 on the display screen based on the detection output of the means 6. Furthermore a drawing means 5 is added to draw the locus of the means 6 when it is decided that the means 6 is included in a drawing area on the display screen and also the light quantity is equal to a prescribed level. Therefore it is decided that the light quantity does not reach the prescribed level when the means 6 is moved to another drawing start point from a certain drawing end point since the means 6 moves slightly away from the display screen. Thus the moved locus of the means 6 is not drawn. In such a constitution, an undesired drawing operation can be avoided and at the same time the drawing operability is improved for an information display device.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to an information display device in a home controller or the like.

(b) Conventional technology Home controllers have, for example, a central control function for various devices placed in the home, a security monitoring function, a function to display various information such as the time and action plans of family members, and even a TV blackboard function. have

The function of this television blackboard is to draw on the CRT display screen the locus traced by the light detector, which is a light detector, on the CRT display screen. To specifically explain the drawing system in the function of this television blackboard, a switch is provided that is activated when the display screen is pressed against the light ben, and only when the switch is actuated, drawing is made on the display screen at the light ben position.

However, in this case, when drawing, it is necessary to keep pressing the light ben against the display screen in order to operate the switch, which is troublesome.

On the other hand, Japanese Utility Model Application No. 62-199852 discloses a configuration in which, after the light ben is pressed against the display screen in order to activate the switch before the start of drawing, the light ben simply draws a trace from then on. . Note that if the light pen is pressed against the light pen to activate the switch again after drawing, the trajectory of the light pen will no longer be drawn.

However, in such a configuration, although there is no problem in drawing with brush strokes, it is not suitable for drawing characters or the like. That is,
When drawing a character or the like, when moving the light ben from one drawing end point to another drawing start point, this moving locus is undesirably drawn. On the other hand, this undesired drawing can be eliminated by pressing the light ben again each time it is moved, but operability deteriorates in such a situation where the light ben is pressed again each time it is moved.

(c) Problems to be Solved by the Invention The present invention seeks to provide an information display device that does not cause undesired drawing when drawing using a light detection means such as a light ben and has improved drawing operability. It is.

(d) Means for Solving the Problems The information display device of the present invention includes a display means for displaying information on a display screen, a light detection means for detecting light from the display screen of the display means, and a light detection means for detecting light from the display screen of the display means. a light amount determination means for determining the amount of light detected by the light detection means; a position determination means for determining the position of the light detection means on the display screen based on the detection output of the light detection means; and the position determination means. When it is determined that the light detecting means is located in the drawing area on the display screen, and the light amount determining means determines that the amount of light detected by the light detecting means is at a predetermined value, the It is characterized by comprising a drawing means for drawing the locus of the light detection means.

(E) If it is determined that a light detection means such as an action light ben is located in the drawing area on the display screen, and if it is determined that the amount of light detected by the light detection means is at a predetermined value, the light is not detected in the drawing area. It is configured to draw the trajectory of the detection means, and therefore,
When moving the light detection means from one drawing end point to another drawing start point when drawing characters, etc., the light detection means moves slightly away from the display screen, so the amount of light detected by the light detection means does not reach a predetermined value. It is determined that the movement locus of the light detection means in this case is not drawn even if the light detection means is in the drawing area.

(f) Embodiment FIG. 1 shows a block circuit relating to the function of a television blackboard in a home controller according to an embodiment of the present invention.

Reference numeral 1 denotes a central control unit consisting of a microcomputer and controls the functions of the television blackboard; 2 a CRT display unit; the display unit has a display screen 3 for displaying information as shown in FIG. 2; It has a drawing area 4 at . 5 is controlled by the central control unit 1 and outputs a synchronization signal and display data to the display unit 2 to display the display unit 2.
A display unit drive circuit which is also a drawing means causes information to be displayed on the display screen 3 of the display unit 2; 6 is a light detection unit that detects light from the display screen 3 of the display unit 2, that is, a light ben; 7 is a detection output of the light ben; A position determination unit determines the position of the light ben 6 on the display screen 3 based on the position determination unit, and the determination result of the position determination unit is input to the central control unit 1. Reference numeral 8 denotes a light amount determination unit, ie, a flip-flop, which determines whether the amount of light detected by the light pen 6 is at a predetermined value. and is reset by a reset signal from the central control section 1, and these set and reset information are output to the central control section 1.

9 is a counter that counts the scan time (1760 seconds) required to scan the display screen 3 once; when the counter counts the scan time, it outputs a count end signal to the central control unit 1; The scan time counted by the control unit 1 is reset.

Immediately after resetting, the scan time starts counting. A register 10 is controlled by the central control unit 1 to store and clear the number of times the flip-flop 8 is set, and a main memory 11 stores a control program for the central control unit l.

FIG. 3 shows the flow of a control program related to the control of the central control unit 1, and the operation related to the television blackboard function will be explained below based on the same figure.

The central control unit 1 normally executes steps S1 and S2, and cycles through steps S3 and S4. In step S1, the counter 9 is reset, and in step S2, the register 10 is cleared.

In step S3, it is determined whether the counter 9 has counted the scan time or not. In step S4, it is determined whether or not the flip-flop 8 is set. This S3,
When the counter 9 counts the scan time while the S4 step is executed in a circular manner, the central control section 1 resets the counter 9 at the S1 step and executes the S3 and S4 steps in a circular manner again.

In such a state, the drawing area 4 of the display screen 3
When the light pen 6 is brought over the drawing area 4 in order to draw, the amount of light from the drawing area 4 detected by the light pen 6 reaches a predetermined value, the flip 70 knob 8 is set, and therefore The central control unit 1 becomes aware of the set state at step S4 during the cyclic execution of steps S3 and S4, and thereafter sequentially executes steps S5, S6, and S7. S
In step 5, reset the flip 70 knob 8,
In step S6, 1 is added to the register 10. S
In step 7, it is determined whether the contents of this register 1o have reached a certain value (for example, 8). Assuming that the value is not constant in this case, the central control unit 1 calculates 83 to s as long as the counter 9 does not count the scan time.
Seven steps are executed cyclically, and during this period, the flip 70 block 8, which was reset at step s5, is set to add 1 to the register 10.

In this way, when the contents of the register 1o reach the above-mentioned - constant value, the central control section 1 proceeds from step S7 to step 88, and based on the judgment result of the position judgment section 7, the light ben 6 is located in the drawing area 4. Decide whether or not. In this case, if it is in the drawing area 4, then the central control unit 1
Step S9 is executed to cause the display drive circuit 5 to draw on the drawing area 4 of the light pen 6.

Thereafter, when the light pen 6 is appropriately traced on the drawing area 4 in the same manner, the locus traced by the light pen 6 is drawn in the drawing area 4.

Now, when drawing characters etc., when moving the light pen 6 from one drawing end point to another drawing start point, the light pen 6 moves slightly away from the display screen 3, so the light pen 6 moves slightly away from the display screen 3.
The amount of light detected by the sensor no longer reaches a predetermined value, and the flip-flop 8 is no longer set. Then, central control unit 1
The process moves from the cyclic execution of steps 83 to S7 to the cyclic execution of steps 83 and S4, and before the contents of the register 1o reach a certain value, the counter 9 counts the scanning time, and the central control unit 1 then A state is reached in which steps S1 and S2 are executed. Therefore, the movement locus of the light pen 6 from the drawing end point to another drawing start point will not be undesirably drawn even if the light pen 6 is in the drawing area 4.

(G) Effects of the Invention According to the present invention, it is possible to eliminate undesired drawing when drawing characters etc. using a light detection means such as a light sensor, and to solve such a problem, it is possible to solve The operation of press-contacting the switch provided on the light detection means can be eliminated, and the operability of drawing can be improved.

[Brief explanation of drawings]

The drawings relate to a home controller according to an embodiment of the present invention.
The figure is a block circuit diagram, Figure 2 is a front view of the CRT display section,
FIG. 3 is a flowchart of the control program. 2...CRT display unit, 3...Display screen, 4...Drawing area, 5...Display unit drive circuit (drawing means), 6...
・Light Ben (light detection means), 7... position determination section, 8
...Flip-flop (light amount determination section).

Claims (1)

[Claims] (1) A display means for displaying information on a display screen, a light detection means for detecting light from the display screen of the display means, and a light amount determination means for determining the amount of light detected by the light detection means; a position determination means for determining the position of the light detection means on the display screen based on a detection output of the light detection means; and a position determination means for determining the position of the light detection means on the display screen based on the detection output of the light detection means; and drawing means for drawing a locus of the light detection means in the drawing area when it is determined by the light amount determination means that the light amount detected by the light detection means is at a predetermined value. Characteristic information display device.