Mask assembly for cathode ray tube

A mask assembly for a cathode ray tube comprising:

• a tension mask having a screen part transmitting electron beams, the screen part having a first area including a center region of the screen part, and having a second area distinguishable from the first area;
• and
• is a mask frame being coupled to said tension mask and reinforcing structural strength of said tension mask while applying tension to said tension mask;
• the screen part including a plurality of real slots, dummy slots, and strip parts, the real slots being located in the first area, the dummy slots being located in the second area;
• the first area including an upper part and a lower part, the upper part being spaced apart from the lower part, a center point at the center of the screen part being located between the upper and lower parts.

A mask assembly for a cathode ray tube, comprising:

• a pair of supporting members;
• a pair of elastic members, each elastic member being disposed between and connected to said supporting members;
• and
• a mask being coupled to said supporting members and being tensioned by said elastic members, said mask having a valid screen part forming a plurality of beam-passing apertures, the screen part having a first area including a center region of the screen part, and having a second area distinguishable from the first area;
• the screen part including a plurality of real slots, dummy slots, and strip parts, the real slots being located only in the first area, the dummy slots being located only in the second area;
• the screen part being arranged to have a first edge region substantially parallel to an X axis, the first area being symmetrically formed around a first imaginary line parallel to the X axis, the first area being symmetrically formed around a second imaginary line perpendicular to the X axis.