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Calculation of plate shadow for eliminating central bright spot in color picture tube

A color picture tube, flat shadow mask technology, applied in the direction of non-light-emitting electrode manufacturing, etc., can solve the problem of white field uniformity and other problems that are not fundamentally solved, and achieve the elimination of central bright spots, good economic and social benefits, and improved picture quality. Effect

Inactive Publication Date: 2008-01-09
CAIHONG GRP ELECTRONICS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the method for eliminating the central bright spot of the picture tube flat shadow mask usually adopts the following methods: a, adjust the uniformity of the film quality in the screen coating process; b, control the center and the spot in the screen coating process The width of the BC strip at the corner; c, corrected by exposing the lens of the exposure table, the calculation method for preparing the flat shadow mask is: the calculation formula of the groove width D = 0.190 + 6.994 × 10 -7 ×X 2 ;Calculation formula of bridge width B B=0.120+5.994×10 -7 ×X 2 +1.392×10 -11 ×X 2 Y 2 ; The above-mentioned methods for eliminating the bright spots in the center do not fundamentally solve the problem of uniformity of the white field, and there are still bright spots in the center and dark spots in the four corners.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method of eliminating the bright spot flat plate shadow mask in the center of the color picture tube includes the first step of calculating the size of the groove width D, and its calculation formula is:

[0034] D=ao+a1X 2 +a2X 4 +a3Y 2 +a4X 2 Y 2 +a5X 4 Y 2 +a6Y 4 +a7X 2 Y 4 +a8X 4 Y 4

[0035] In the above formula, ao~a8 is the shadow mask groove width coefficient, and its range of coefficients is:

[0036] ao=1.680000E-01~1.750000E-01

[0037] a1=8.406526E-07~8.840960E-07

[0038] a2=2.617313E-12~4.039531E-12

[0039] a3=4.130332E-07~4.574886E-07

[0040] a4=-1.075321E-11~-1.299765E-11

[0041] a5=0.000000E-00~0.000000E-00

[0042] a6=5.011613E-12~5.4453057E-12

[0043] a7=0.000000E-00~0.000000E-00

[0044] a8=0.000000E-00~0.000000E-00

[0045] The second step is to calculate the size of the bridge width B: the calculation formula of the bridge width B is:

[0046] B=bo+b1X 2 +b2X 4 +b3Y 2 +b4X 2 Y 2 +b5X 4 Y 2 +b6Y 4 +b7...

Embodiment 2

[0059] The calculation formula of groove width D, bridge width B is the same as embodiment 1, and the calculation coefficient of its groove width D is:

[0060] ao=1.700000E-01 a1=8.506526E-07

[0061] a2=3.017313E-12 a3=4.200332E-07

[0062] a4=-1.005321E-11 a5=0.000000E-00

[0063]a6=5.101613E-12 a7=0.000000E-00

[0064] a8=0.000000E-00

[0065] The calculation coefficient of bridge width B is:

[0066] bo=1.380000E-01 b1=-7.133030E-07

[0067] b2=1.505601E-11 b3=-7.680214E-07

[0068] b4=2.6606123E-11 b5=3.667224E-16

[0069] b6=-2.956039E-13 b7=1.090020E-15

[0070] b8=-3.990262E-20

[0071] X and Y in the above formula are the coordinate values ​​of each point in the Cartesian coordinate system.

Embodiment 3

[0073] The calculation formula of groove width D, bridge width B is the same as embodiment 1, and the calculation coefficient of its groove width D is:

[0074] ao=1.750000E-01 a1=8.840960E-07

[0075] a2=4.039531E-12 a3=4.574886E-07

[0076] a4=-1.299765E-11 a5=0.000000E-00

[0077] a6=5.4453057E-12 a7=0.000000E-00

[0078] a8=0.000000E-00

[0079] The second step is to calculate the size of the bridge width B: the calculation formula of the bridge width B is:

[0080] B=bo+b1X 2 +b2X 4 +b3Y 2 +b4X 2 Y 2 +b5X 4 Y 2 +b6Y 4 +b7X 2 Y 4 +b8X 4 Y 4

[0081] In the above formula, bo~b8 is the shadow mask bridge width coefficient, and the coefficient range is:

[0082] bo=1.700000E-01 b1=-7.588580E-07

[0083] b2=1.999054E-11 b3=-8.780214E-07

[0084] b4=3.606123E-11 b5=3.989446E-16

[0085] b6=-3.337019E-13 b7=1.252264E-15

[0086] b8=-4.298484E-20

[0087] X and Y in the above formula are the coordinate values ​​of each point in the Cartesian coordinate syste...

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Abstract

The calculation method for eliminating central bright spot in color picture tube, and especially raising the white field homogeneity and the corner-to-center brightness ratio of color picture tube includes the following steps: to calculate groove width D in terms of the expression of D=a0+a1X2+a2X4+a3Y2+a4X2Y2+a5X4Y2+a6Y4+a7X2Y4+a8X4Y4 and to calculate bridge width B of the expression of B=b0+b1X2+b2X4+b3Y2+b4X2Y2+b5X4Y2+a6Y4+a7X2Y4+a8X4Y4. The improved expressions for D and B result in reduced D and B, mild transition from the central part to peripheral in the plate shadow, eliminating central bright spot in color picture tube, and raised overall picture quality of the color picture tube.

Description

technical field [0001] The invention relates to a calculation method for preparing a flat shadow mask for eliminating the bright spot of a picture tube, in particular to a calculation method for improving the white field uniformity of the color tube and the brightness ratio between the corner and the center. Background technique [0002] In the prior art, the method for eliminating the central bright spot of the picture tube flat shadow mask usually adopts the following methods: a, adjust the uniformity of the film quality in the screen coating process; b, control the center and the spot in the screen coating process The width of the BC strip at the corner; c, corrected by exposing the lens of the exposure table, the calculation method for preparing the flat shadow mask is: the calculation formula of the groove width D = 0.190 + 6.994 × 10 -7 ×X 2 ;Calculation formula of bridge width B B=0.120+5.994×10 -7 ×X 2 +1.392×10 -11 ×X 2 Y 2 ; The above-mentioned several method...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01J9/14
Inventor 王建平王鹏王鲁南牛少梅
Owner CAIHONG GRP ELECTRONICS CO LTD
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