JPS5446431A - Display unit with dark bright function - Google Patents

Display unit with dark bright function

Info

Publication number
JPS5446431A
JPS5446431A JP11365177A JP11365177A JPS5446431A JP S5446431 A JPS5446431 A JP S5446431A JP 11365177 A JP11365177 A JP 11365177A JP 11365177 A JP11365177 A JP 11365177A JP S5446431 A JPS5446431 A JP S5446431A
Authority
JP
Japan
Prior art keywords
display
screen
dark
picture
dark bright
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.)
Pending
Application number
JP11365177A
Other languages
Japanese (ja)
Inventor
Chishio Ooyama
Eiichi Kumagai
Kazuhito Furukawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP11365177A priority Critical patent/JPS5446431A/en
Publication of JPS5446431A publication Critical patent/JPS5446431A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To realize dark bright display easily, by varying a refresh frequency according to the assignment of the dark bright bit of display information.
CONSTITUTION: Screen memory 16 refreshes the screen, video signal generating circuit 100 extracts a picture from screen memory 16 to generate a video signal for the display screen, and picture display 300 is achieved according to the output of the circuit 100. Here, the number of times of refreshing at the position on the screen assigned by the indication of dark register 18 assigning the position dark light is decreased at a preset rate by the frequency obtained by increasing or decreasing the original oscillation frequency from main clock 12 by horizontal scanning frequency counter 13, vertical scanning counter 14, and divider circuit 17. Conwequently, the dark bright display can be realized eaily by varying the brightness of the display at the assigned position of a picture
COPYRIGHT: (C)1979,JPO&Japio
JP11365177A 1977-09-20 1977-09-20 Display unit with dark bright function Pending JPS5446431A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11365177A JPS5446431A (en) 1977-09-20 1977-09-20 Display unit with dark bright function

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11365177A JPS5446431A (en) 1977-09-20 1977-09-20 Display unit with dark bright function

Publications (1)

Publication Number Publication Date
JPS5446431A true JPS5446431A (en) 1979-04-12

Family

ID=14617661

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11365177A Pending JPS5446431A (en) 1977-09-20 1977-09-20 Display unit with dark bright function

Country Status (1)

Country Link
JP (1) JPS5446431A (en)

Similar Documents

Publication Publication Date Title
TW324790B (en) Liquid Displying Device
JPS5482931A (en) Display unit for cathode ray tube
JPS54112122A (en) Picture display unit
JPS5376623A (en) Single-tube-type color television camera
JPS5446431A (en) Display unit with dark bright function
JPS5768982A (en) Display device
KR960009309B1 (en) On screen display circuit
JPS5432223A (en) Level display unit
JPS5724172A (en) Multiscreen display device
JPS54109331A (en) Character display unit
JPS5679976A (en) Color cathode ray tube display device
JPS5452928A (en) Crt display unit
JPS5617583A (en) Television picture receiver
GB1428156A (en) Systems for the visual display of coded information
KR970031912A (en) Synchronous signal generator for on screen display
JPS5220865A (en) Portable electronic clock
JPS5227324A (en) Image amplifier circuit
SU1008927A2 (en) Device for receiving additional information transmitted simultaneously with television signal
JPS52136530A (en) Video signal production unit
JPS5599678A (en) Monitor for optical character reader
JPS551739A (en) Tuning display unit
JPS5330828A (en) Detecting system of position indicated by light pen
JPS5713868A (en) Two-screen television receiver
JPS53148233A (en) Image-data scrolling system
JPS5542489A (en) Multiplex information receiver