Patent ID: 8390748

Claim:
An electro-optical display device comprising: a transmission-type liquid crystal panel including a liquid crystal, a driving substrate having an outer side opposite the liquid crystal, and an opposing substrate having an outer side opposite the liquid crystal, the liquid crystal being disposed between the driving substrate and the opposing substrate; a first light-transmissive substrate disposed on the outer side of the driving substrate; a second light-transmissive substrate disposed on the outer side of the opposing substrate, and a plurality of element substrates including at least the driving substrate, the opposing substrate, the first light-transmissive substrate, and the second light-transmissive substrate, at least one substrate of the plurality of element substrates having negative thermal expansion coefficients and at least another substrate of the plurality of element substrates having positive thermal expansion coefficients, under the condition that the thermal expansion coefficients of the driving substrate, the opposing substrate, the first light-transmissive substrate, and the second light-transmissive substrate are α 1 , α 2 , α 3 , and α 4 , respectively, refractive indices of the driving substrate, the opposing substrate, the first light-transmissive substrate, and the second light-transmissive substrate are n 1 , n 2 , n 3 , and n 4 , respectively, and thicknesses of the driving substrate, the opposing substrate, the first light-transmissive substrate, and the second light-transmissive substrate are d 1 , d 2 , d 3 , and d 4 , respectively, the refractive indices n 1 to n 4 being within the range of 1.5±0.1, and a product sum operation value d 1 ·α 1 +d 2 ·α 2 +d 3 ·α 3 +d 4 ·α 4 of the thicknesses and the thermal expansion coefficients being within the range of 0±17×10 −7 [mm/K], and a product sum operation value n 1 ·d 1 ·α 1 +n 2 ·d 2 ·α 2 +n 3 ·d 3 ·α 3 +n 4 ·d 4 ·α 4 of the refractive indices, the thicknesses, and the thermal expansion coefficients being within the range of 0±24×10 −7 [mm/K].