US6741295B2 — Preventing doming phenomena

Claim 1

Independent Claim 80 words

A method of preventing doming phenomena, the method comprising: obtaining luminance histogram distribution values from a luminance signal; processing and normalizing the various luminance histogram distribution values; processing the luminance histogram distribution values to correct for at least actual contrast and brightness settings to obtain corrected histogram data; furnishing a predicted beam current from said corrected histogram data; and deriving a correction signal from the predicted beam current and making said correction signal effective in said processing and normalizing step.

Claim 2

Independent Claim 80 words

A method of preventing doming phenomena, the method comprising: obtaining luminance histogram distribution values from a luminance signal; processing and normalizing the various luminance histogram distribution values; processing the luminance histogram distribution values to correct for at least actual contrast and brightness settings to obtain corrected histogram data; furnishing a predicted beam current from said corrected histogram data; and deriving a correction signal from the predicted beam current and making said correction signal effective in said processing and normalizing step.

Claim 3

Dependent Claim 88 words

A circuit for preventing doming phenomena, the circuit comprising: a histogram memory for obtaining a luminance distribution from a luminance signal; an operating circuit for processing and normalizing the various values in said histogram memory; means for processing the histogram data to correct for at least actual contrast and brightness settings to obtain corrected data; means for furnishing a predicted beam current from said corrected data; and means for deriving a correction signal from the predicted beam current and making said correction signal effective in said operating circuit.

Claim 4

Dependent Claim 88 words

A circuit for preventing doming phenomena, the circuit comprising: a histogram memory for obtaining a luminance distribution from a luminance signal; an operating circuit for processing and normalizing the various values in said histogram memory; means for processing the histogram data to correct for at least actual contrast and brightness settings to obtain corrected data; means for furnishing a predicted beam current from said corrected data; and means for deriving a correction signal from the predicted beam current and making said correction signal effective in said operating circuit.

Claim 5

Dependent Claim 41 words

The circuit for preventing doming phenomena as claimed in claim 2 , wherein only the luminance signals corresponding to predetermined areas on the screen are taken into account to obtain local predictions of the beam current based on local histogram measurements.

Claim 6

Dependent Claim 43 words

The circuit for preventing doming phenomena as claimed in claim 3 , wherein the predetermined areas cover elongated windows with relatively small horizontal dimension and relatively large vertical dimension at a predetermined distance from the right or left edge, respectively, of the screen.

Claim 7

Dependent Claim 50 words

The circuit for preventing doming phenomena as claimed in claim 4 , wherein further predetermined areas cover elongated windows with relatively small horizontal dimension and relatively large vertical dimension adjacent to the extreme right or left edge, respectively, of the screen to compensate for a thermic-mechanic compensation of local doming.

Claim 8

Dependent Claim 44 words

The circuit for preventing doming phenomena as claimed in claim 2 , wherein said histogram data processing means comprises means for correcting the data in agreement with intensity variations instructed by a look-up table memory having stored therein the processed and normalized histogram values.

Claim 9

Dependent Claim 46 words

The circuit for preventing doming, phenomena as claimed in claim 2 , wherein the means for predicting the beam current comprises a summing circuit in which the values, received from the histogram memory after multiplication with a weight factor, are summed to obtain a weighted sum.

Claim 10

Dependent Claim 32 words

The circuit for preventing doming phenomena as claimed in claim 7 , wherein the weighted sum is processed in a window size compensation circuit providing compensation for 50 Hz/60 Hz receiver circuits.

Claim 11

Dependent Claim 34 words

The circuit for preventing doming phenomena as claimed in claim 7 , wherein the weighted sum is further processed in a black/white compensation circuit providing compensation for relatively large white surfaces within a window.

Claim 12

Dependent Claim 52 words

A television receiver comprising a cathode ray tube having a screen which a picture is produced by an electron beam under control of an electronic receiver circuit having intensity, contrast and brightness control means, said intensity control circuit being equipped with a local doming prevention circuit as claimed in claim 2 .

Claim 13

Dependent Claim 130 words

A circuit for preventing doming phenomena, the circuit comprising: a histogram memory for obtaining a luminance distribution from a luminance signal; an operating circuit for processing and normalizing the various values in said histogram memory; means for processing the histogram data to correct for at least actual contrast and brightness settings to obtain corrected data; means for furnishing predicted beam current from said corrected data; and means for deriving a correction signal from the predicted beam current and making said correction signal effective in said operating circuit, wherein said circuit for preventing doming phenomena further comprises a switch coupled between the histogram memory and the histogram data processing means for selectively connecting the output of the histogram memory either with said histogram data processing means or with said operating circuit.

Claim 14

Dependent Claim 130 words

A circuit for preventing doming phenomena, the circuit comprising: a histogram memory for obtaining a luminance distribution from a luminance signal; an operating circuit for processing and normalizing the various values in said histogram memory; means for processing the histogram data to correct for at least actual contrast and brightness settings to obtain corrected data; means for furnishing predicted beam current from said corrected data; and means for deriving a correction signal from the predicted beam current and making said correction signal effective in said operating circuit, wherein said circuit for preventing doming phenomena further comprises a switch coupled between the histogram memory and the histogram data processing means for selectively connecting the output of the histogram memory either with said histogram data processing means or with said operating circuit.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	2007-05-25	2007-11-24	2008-05-25	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2011-05-25	2011-11-24	2012-05-25	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2015-05-25	2015-11-24	2016-05-25	$7700.00	Window Closed / Lapsed

Preventing doming phenomena

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