Glass substrate for flat panel display, process for producing the same, and display panel employing the same
View Patent ↗The present invention provides a glass substrate for flat panel display in which yellowing occurring in a case of forming silver electrodes on glass substrate surface is inhibited. A glass substrate for flat panel display, which is formed by a float method, which has a composition consisting essentially of, in terms of oxide amount in mass %: SiO 2 50 to 72%, Al 2 O 3 0.15 to 15%, MgO + CaO + SrO + BaO 4 to 30%, Na 2 O more than 0% and at most 10%, K 2 O 1 to 21%, Li 2 O 0 to 1%, Na 2 O + K 2 O + Li 2 O 6 to 25%, ZrO 2 0 to 10%, and Fe 2 O 3 0.0725 to 0.15%; and wherein the average Fe 2+ content in a surface layer of the glass substrate within a depth of 10 μm from the a top surface is at most 0.0725% in terms of Fe 2 O 3 amount.
1. A glass substrate for flat panel display, which is formed by a float method, which has a composition consisting essentially of, in terms of oxide amount in mass %:
SiO 2
50 to 72%,
Al 2 O 3
0.5 to 15%,
MgO + CaO + SrO + BaO
4 to 30%,
Na 2 O
more than 0% and at most 10%,
K 2 O
1 to 21%,
Li 2 O
0 to 1%,
Na 2 O + K 2 O + Li 2 O
6 to 25%,
ZrO 2
0 to 10%, and
Fe 2 O 3
0.0725 to 0.15%; and
wherein the average Fe 2+ content in a surface layer of the glass substrate within a depth of 10 μm from a top surface is at most 0.0725% in terms of Fe 2 O 3 amount.
2. A process for producing glass substrate for flat panel display, which is a process for producing the glass substrate for flat panel display as defined in claim 1 , comprising forming the glass substrate on a float bath wherein a hydrogen concentration in a float bath atmosphere is at most 3 vol %.
3. The process for producing glass substrate for flat panel display, which is a process for producing the glass substrate for flat panel display as defined in claim 1 , comprising forming the glass substrate on a float bath wherein a glass-staying time in the float bath is at most 15 minutes.
4. A process for producing glass substrate for flat panel display, which is a process for producing a glass substrate for flat panel display as defined in claim 1 , comprising forming the glass substrate on a float bath wherein a hydrogen concentration in a float bath atmosphere is at most 3 vol %, and a glass-staying time in the float bath is at most 15 minutes.
5. A flat panel display employing the glass substrate for flat panel display as defined in claim 1 .