JP3512337B2 - OSD display control method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an OSD (On S
The present invention relates to an OSD display control method for controlling a display (clean display). 2. Description of the Related Art In a general microcomputer (hereinafter simply referred to as a microcomputer), one main control unit (that is, CPU) performs a plurality of controls. FIG. 4 is a block diagram showing a configuration of a video control microcomputer which is an example of the above-mentioned microcomputer. In FIG. 4, 41 is a CPU, 42 is an OSD display control unit, 43 is a mechanical control unit for controlling a mechanism, and 44 is a remote control input unit for inputting a remote control. [0004] The schematic operation of the video control microcomputer thus configured will be described below. CPU 41
Controls the OSD display control unit 42 when the OSD display control request is received, controls the mechanical control unit 43 when the mechanical control request is received, and controls the remote control input unit 44 when the remote control input request is received. However, even if the CPU 41 receives a mechanical control request or a remote control input request while controlling the OSD display control unit 42, for example, the mechanical control unit 43 or the remote control input unit 44 cannot be controlled. Hereinafter, a conventional OSD display control method will be described. FIG. 5 is a flowchart showing a conventional OSD display control method. When an external start request is received,
The CPU 511 controls the OSD display control unit 512 to continuously execute each operation from the first-row control data generation unit 501 to the tenth-row control data generation unit 510. FIG. 8 is an occupancy timing chart of the CPU 511 in the conventional OSD display control method.
In FIG. 8, assuming that the screen is composed of 10 lines and the CPU 511 is occupied for 1 ms in the n-th line control data generation step, the OSD display controller 5
12 occupies the CPU 511 for 10 ms. In the meantime, the CPU 511 cannot perform another control. [0007] As described above, in the conventional OSD display control method as described above, the CPU is occupied for a long time each time an external start request is generated, and during that time, other control is performed. Cannot be performed. After the control data of all rows is generated at the time of the start request, the OSD is generated until the next start request is generated.
Since the display control data is not generated, for example, when the OSD display control data is destroyed due to an external factor, there is also a problem that the abnormal screen remains displayed until the next start request is received. . SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. In addition to reducing the time for occupying the CPU at one time, the real-time performance of other controls can be improved.
Provided is an OSD display control method capable of performing a safe operation of periodically refreshing SD display control data and returning to a normal screen even when an abnormal screen is displayed. [0010] In order to solve the above-mentioned problems, an OSD display control method according to the present invention is started at regular time intervals.
Starting at a fixed interval for generating an operation request, and displaying the OSD
Each line from the first line to the n-th line on the display screen
Control data generator that generates control data for display
And a control for designating the control data generation step to be executed
A data specifying step and a high frequency of change on the display screen.
A selected row storing step of storing a selected row number.
The data designating step includes selecting the row stored in the selected row storing step.
The first control data generation step corresponding to the number and whether the first row
Of the second control data corresponding to the predetermined row in the n-th row.
And the performing step are alternately performed at the predetermined time interval.
Every time the second control data generation step is performed.
Change a given line to adjacent lines sequentially. As described above, the time for temporarily occupying the CPU can be shortened to improve the real-time property of other controls, and the OSD display control data can be refreshed periodically to display a normal screen even if an abnormal screen is displayed. A safe operation to return to the screen can be performed. DETAILED DESCRIPTION OF THE INVENTION hereinafter, the OSD display control method showing an embodiment of the present invention will be specifically described with reference to the drawings. Embodiment 1 OSD (On Screen) according to Embodiment 1 of the present invention.
(Display) A display control method will be described. FIG. 1 is a flowchart for explaining the OSD display control method according to the first embodiment. In FIG. 1, reference numeral 1 denotes a first-row control data generator that generates control data of a first row, 2 denotes a second-row control data generator that generates control data of a second row, and 3 denotes control data of a third row. The third line control data generation unit 4 generates the control data of the fourth line.
Line control data generator 5, line 5 control data generator for generating control data of line 5, line 6 control data generator for generating control data of line 6, line 7 7th control data generator for generating control data of 8th row, 8th control data generator for 8th row generating control data of 9th row, 9 generation of control data of 9th row for generating control data of 9th row Unit, 10 is a 10th line control data generation unit that generates the 10th line control data, 11 is a CPU, 12 is an OSD display control unit, 13 is a fixed interval start unit that issues a start request at fixed time intervals, 14 is The control data specifying unit specifies a control data generating unit to be executed. The OSD display control method according to the first embodiment shown in the above flow chart will be described below.
When the fixed interval start unit 13 generates a start request, the CPU 1
1 executes the operation of the control data generation unit 5 in the fifth row specified by the control data specification unit 14 to generate the control data in the fifth row. Embodiment 2 An OSD display control method according to Embodiment 2 of the present invention will be described. FIG. 2 is a flowchart for explaining an OSD display control method before and after a predetermined time in the OSD display control method according to the second embodiment, and FIG.
FIG. 2B shows a flowchart of display control, and FIG.
4 shows a flowchart of SD display control. At a certain point in time shown in FIG. 2A, the control data specifying unit 14 specifies the fifth row control data generating unit 5, and after a certain time shown in FIG. The line control data generator 6 is designated. As described above, the control data designating section 14 sets the first line control data generating section 1, the second line control data generating section 2, and the third line control Data generation unit 3, 4th line control data generation unit 4, 5th line control data generation unit 5, 6th line control data generation units 6, 7
Line control data generator 7, Line 8 control data generator 8,
By designating the ninth line control data generation unit 9 and the tenth line control data generation unit 10 in order, (constant time × 10)
Control the whole screen in time. By repeating the above, the OSD
By refreshing the display control data, for example, even if an abnormal screen is displayed due to an external factor, it can be automatically returned to a normal screen. FIG. 6 is an example of a screen transition diagram when an abnormal screen occurs in the OSD display control method according to the second embodiment.
FIG. 6A shows a conventional screen transition diagram, and FIG. 6B shows a screen transition diagram in the second embodiment. In FIG. 6, 61a and 61b are normal screens, and 62a and 62b are abnormal screens formed by destroying the normal screens 61a and 61b by external factors. In the conventional method, as shown in FIG. 6A, when a transition is made to the abnormal screen 62a, the normal screen 61a is output until an activation request is issued from the outside.
Cannot be returned to On the other hand, in the second embodiment, as shown in FIG. 6B, even if the screen shifts to the abnormal screen 62b, the normal screen 6b is automatically set after (the predetermined time × 10).
1b. FIG. 9 is an occupancy timing chart of the CPU 11 in the OSD display control method according to the second embodiment. Assuming that the time required for recognizing a change in the OSD display from the human eyes is 200 ms or more, if the screen is composed of 10 rows, the n-th row control data generation step is performed in 20 m.
OSD that is not uncomfortable to human eyes if started at s intervals
Display control is possible. In FIG. 9, assuming that the CPU 11 is occupied for 1 ms in the n-th row control data generation step, other controls can be performed for the remaining 19 ms, and the delay of the other controls is 1 ms at the maximum. At this time, the occupancy of the CPU 11 is 1/20. Further, by repeatedly specifying the generation of the control data in the first line to the generation of the control data in the tenth line in order, even if an abnormal screen is displayed due to an external factor, the screen can be returned to the normal screen after 200 ms. Embodiment 3 An OSD display control method according to Embodiment 3 of the present invention will be described. FIG. 3 is a flowchart for explaining the OSD display control method according to the third embodiment. In FIG. 3, reference numeral 1 denotes a first-row control data generator that generates control data of a first row, 2 denotes a second-row control data generator that generates control data of a second row, and 3 denotes control data of a third row. The third line control data generation unit 4 generates the control data of the fourth line.
Row control data generating unit, the fifth line control data generating unit 5 for generating control data in row 5, 6 sixth line control data generating unit for generating control data line 6, 7 Line 7 7th control data generator for generating control data of 8th row, 8th control data generator for 8th row generating control data of 9th row, 9 generation of control data of 9th row for generating control data of 9th row Unit, 10 is a 10th line control data generation unit that generates the 10th line control data, 11 is a CPU, 12 is an OSD display control unit, 13 is a fixed interval start unit that issues a start request at fixed time intervals, 14 is A control data designating unit 15 for designating a control data generating unit to be executed is a selected row storage unit for storing a frequently changed row number. The control data specifying unit 1 in the OSD display control method according to the third embodiment shown in the flow chart as described above.
The operation of No. 4 will be described below. FIG. 7 is an example of an OSD display screen in which, for example, 9 is stored in the selected row storage unit 15 in the OSD display control method according to the third embodiment. In the display screen of FIG. 7, the remaining tape value on the ninth line indicates the remaining amount of tape in time, and the value always changes while the tape is running. For the other rows,
There is no change on this screen. In the case of such a screen display, the control data specifying unit 14 determines that 1 → 9 → 2 → 9 → 3 → 9 → 4 → 9 → 5
→ 9 → 6 → 9 → 7 → 9 → 8 → 9 → 9 → 9 → 10 → 9 → 1
Thus, the control data generators 1 to 10 are designated. This is because the display screen frequently changes 9
Ninth-row control data generator 9 that generates control data for the row
Is frequently specified, and the control data is refreshed for all rows. FIG. 10 is an occupancy timing chart of the CPU 11 in the OSD display control method according to the third embodiment. Assuming that the time required for recognizing a change in the OSD display from the human eye is 200 ms or more, if the control data generation unit 9 on the ninth line is started at 200 ms intervals, a display that does not make the user feel uncomfortable Screen. Therefore, the activation request generation interval of the constant interval activation unit 13 can be extended up to 100 ms.
11 can be suppressed to 1/100.
In that case, even if the error screen is displayed due to external factors,
After (200 × 10) = 2000 ms, it is possible to return to the normal screen. As described above, according to the present invention, the control data can be divided into rows and generated at regular time intervals, thereby reducing the time for occupying the CPU at one time. The real-time property of other controls can be improved. By repeating this, the OSD
The display control data can be periodically refreshed, and even if an abnormal screen is displayed due to an external factor, a safe operation of returning to the normal screen can be performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart for explaining an OSD display control method according to a first embodiment of the present invention. FIG. 3 is a flowchart for explaining an OSD display control method according to a third embodiment of the present invention; FIG. 4 is a configuration diagram of a video control microcomputer showing an example of a conventional OSD display control method; FIG. FIG. 6 is a flowchart for explaining the OSD display control method according to the present invention. FIG. 6 is a screen transition diagram when an abnormal screen occurs in the OSD display control method according to the second embodiment of the present invention. FIG. 7 is an OSD display according to the third embodiment of the present invention. FIG. 8 is an example of an OSD display screen when 9 is stored in the selected row storage unit in the control method. FIG. 8 is a timing chart of CPU occupation in the conventional OSD display control method. FIG. 9 is an OSD display control according to the second embodiment of the present invention. CPU occupancy timing chart in the method FIG. 10 CPU occupancy timing chart in the OSD display control method according to the third embodiment of the present invention [Explanation of symbols] 11 CPU 12 OSD display control section 13 Fixed interval start section 14 Control data designation section 15 Selected row storage

Claims (1)

(57) A method for controlling an OSD display by a programmed microcomputer, comprising: a fixed interval start step of generating a start request at a fixed time interval;
A control data generating step of generating control data for displaying each line up to n-th row from the first row in the display screen by the SD display, and control data designation step of designating the control data generating process to be executed, the display Changes on the screen
A selected row storing step of storing a row number with high frequency ,
The control data designating step stores in the selected row storing step.
A first control data generation step corresponding to the performed row number;
Second control corresponding to a predetermined row in the first to n-th rows
And the data generation step are alternately executed at the predetermined time interval.
Every time the second control data generation step is executed.
And a method of sequentially changing the predetermined row to an adjacent row .