Electronic device

An electronic display device, comprising:

• an insulating substrate having a first surface and a second surface opposite to the first surface, wherein the insulating substrate has a thickness denoted by t and a width denoted by WS;
• a display medium layer disposed on the insulating substrate;
• a first hole penetrating through the insulating substrate, wherein the first hole has a first area on the first surface denoted by A1′ and a second area on the second surface denoted by A1;
• and
• a second hole penetrating through the insulating substrate, wherein the second hole has a third area on the first surface denoted by A2′ and a fourth area on the second surface denoted by A2, and a distance between the first hole and the second hole is denoted by d,
• wherein values of the thickness t, the width WS, the first area A1′, the second area A1, the third area A2′, the fourth area A2, and the distance d are conformed to the following equation (I):
• N
• ×
• log
• 
• (
• (
• A
• 
• 
• 1
• ′
• +
• A
• 
• 
• 1
• +
• A
• 
• 
• 2
• ′
• +
• A
• 
• 
• 2
• )
• /
• 2
• )
• t
• ≤
• d
• <
• WS
• -
• N
• ×
• log
• 
• (
• A
• 
• 
• 1
• ′
• +
• A
• 
• 
• 1
• +
• A
• 
• 
• 2
• ′
• +
• A
• 
• 
• 2
• )
• t
• (
• I
• )
• wherein A1′, A1, A2′, and A2 are in the unit of μm2, t and WS are in the unit of μm, and N is greater than 0 and less than 1E6.