EP0094670A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Color image display apparatus
Assignee: Panasonic Holdings Corp
•
Filing: 1983-05-16
•
Granted: —
•
Expires: 2003-05-16
Abstract
Abstract A flat CRT type color image display apparatus comprises a number of horizontally disposed parallel line cathodes, vertical and horizontal deflection means and electron beams control means, wherein a clock pulse signal is produced by frequency-multiplying a pulse signal which is synchronized with color sub-carrier of the color TV signal, chrominance signal is A/D converted using the clock signal, therewith producing a PWM signal with which electron beams are controlled.
Inventors
- 👤 Sadahiro Iyehara
- 👤 Shizuo Inohara
- 👤 Mitsuya Masuda
- 👤 Minoru Ueda
- 👤 Keisuke Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 19:34
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
118 words
A color image display apparatus comprising: clock signal generator means for generating a clock signal having a frequency of an integer-times-miltipli- cation of a color sub-carrier of a color television signal, said clock signal being synchronized to said color sub-carrier, A/D conversion means for converting composite signal of said color television signal into digital primary color signals by utilizing said clock signal, memory means for storing -said digital primary color signals until the next end of the horizontal scanning period, PWM means for converting said digital primary color signals read out from said memory means into pulse-width modulated primary color signals, and color image display means for displaying color image by utilizing said pulse-width modulated primary color signals.
Claim 2
Dependent Claim
118 words
A color image display apparatus comprising: clock signal generator means for generating a clock signal having a frequency of an integer-times-miltipli- cation of a color sub-carrier of a color television signal, said clock signal being synchronized to said color sub-carrier, A/D conversion means for converting composite signal of said color television signal into digital primary color signals by utilizing said clock signal, memory means for storing -said digital primary color signals until the next end of the horizontal scanning period, PWM means for converting said digital primary color signals read out from said memory means into pulse-width modulated primary color signals, and color image display means for displaying color image by utilizing said pulse-width modulated primary color signals.
Claim 3
Dependent Claim
43 words
A color image display apparatus in accordance with claim 1, wherein said clock signal generator constitutes a phase locked loop circuit, which produces clock signals for said A/D conversion means and said PWM means by frequency- dividing of phased locked said color signal.
Claim 4
Dependent Claim
128 words
A color image display apparatus in accordance with claim 1, wherein said chrominance signal consists of red, green and blue primary color signals and said digital chrominance signal consists of digital chrominance signals for red, green and blue primary colors, and said memory means comprises first memory for storing said digital chrominance signals for red, green and blue primary colors until the next horizontal scanning period, second memory for storing data of said first memory and signal transporting means for transporting data of said first memory into said second memory at the same time within a flyback period of the horizontal scanning, data in said second memory being pulse-width modulated by said PWM means within at least a part of the next flyback period of the horizontal scanning.
Claim 5
Dependent Claim
27 words
A color image display apparatus in accordance with claim 1, wherein. the same clock signal are fed to said A/D conversion means and to said PWM means.
Claim 6
Dependent Claim
54 words
A color image display apparatus in accordance with claim 1, wherein a first clock signal which is produced by first- integer-times multiplication of the color sub-carrier is fed to said A/D conversion means and a second clock signal which is produced by second-integer-times multiplication of the color sub-carrier is fed to said PMM means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.