Display device with micro lens array

• US 5,276,538 A
• Filed: 04/02/1991
• Issued: 01/04/1994
• Est. Priority Date: 04/05/1990
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Kuribayashi, Kiyoshi, Monji, Hideto, Umetani, Makoto
• Primary Examiner(s): Arnold, Bruce Y.
• Assistant Examiner(s): PARSONS, DAVID
• Application Number:
  US07/678,155
• Time in Patent Office: 1,008 Days
• Field of Search: 359/618, 359/619, 359/620, 359/621, 359/622, 359/623, 359/624, 359/625, 359/626, 359/627, 359/628, 359/741, 359/796, 359/797, 359/454, 359/455, 359/456, 359/457, 359/458 , 359/459, 359/36, 359/40, 359/54, 359/642, 65/37, 65/39, 65/45, 65/47, 65/48
• US Class Current: 349/95
• CPC Class Codes: C03B 11/005 Pressing under special atmospheres, e.g. inert, reactive, vacuum, clean
• CPC Class Codes: C03B 11/082 having profiled, patterned or microstructured surfaces
• CPC Class Codes: C03B 11/086 of coated dies use of materials as release or lubricating compositions C03B40/02
• CPC Class Codes: C03B 2215/12 Ceramics or cermets, e.g. cemented WC, Al2O3 or TiC
• CPC Class Codes: C03B 2215/17 comprising one or more of the noble meals, i.e. Ag, Au, platinum group metals
• CPC Class Codes: C03B 2215/414 Arrays of products, e.g. lenses
• CPC Class Codes: C03B 2215/66 Means for providing special atmospheres, e.g. reduced pressure, inert gas, reducing gas, clean room
• CPC Class Codes: C03B 2215/80 Simultaneous pressing of multiple products; Multiple parallel moulds
• CPC Class Codes: C03C 17/04 by fritting glass powder
• CPC Class Codes: C03C 3/064 containing boron
• CPC Class Codes: C03C 3/155 containing zirconium, titanium, tantalum or niobium
• CPC Class Codes: C03C 8/02 Frit compositions, i.e. in a powdered or comminuted form
• CPC Class Codes: G02B 3/0031 Replication or moulding, e.g. hot embossing, UV-casting, injection moulding
• CPC Class Codes: G02F 1/133526 Lenses, e.g. microlenses or Fresnel lenses

Abstract

An array of optical microelements is produced by press molding, at a high temperature, a transparent glass with a press mold which has a molding surface formed into a shape corresponding to the optical microelement array and coated with a chemically stable thin film.

Claims

1. A micro lens array comprising:

a glass substrate; and

a plurality of micro lenses formed on said glass substrate, said micro lenses being made of a glass having a lower melting point than that of said glass substrate.

2. A micro lens array comprising:

a glass substrate;

a glass layer made of a glass having a lower melting point than that of said glass substrate; and

a plurality of micro lenses formed on said glass layer, said micro lenses being made of the same glass material as that of said glass layer.

3. A micro lens array comprising:

a glass substrate having opposite surfaces;

a plurality of micro lenses formed on one of the opposite surfaces of said glass substrate, said micro lenses being made of a glass having a lower melting point than that of said glass substrate; and

an alkali elution layer formed on the other of the opposite surfaces of said glass substrate.

4. A display device comprising:

a first glass substrate having formed at one surface thereof a common electrode layer;

a second glass substrate having opposite first and second surfaces and disposed such that the first surface opposes the common electrode layer, the first surface having formed thereon a plurality of pixel electrodes and a plurality of switching elements connected to the pixel electrodes respectively;

a display material layer sandwiched between the common electrode layer and the first surface of the second glass substrate on which the plurality of pixel electrodes and the plurality of switching elements are formed; and

a micro lens array composed of a plurality of micro lenses formed on the second surface of the second glass substrate so as to correspond to the plurality of pixel electrodes such that a focal point of each of the plurality of micro lenses is disposed at a corresponding one of the plurality of pixel electrodes, said micro lens array being made of a glass having a lower melting point than that of the second glass substrate.

5. The display device according to claim 4, wherein said display material layer comprises a liquid crystal layer.

6. A display device comprising:

a first glass substrate having formed at one surface thereof a common electrode layer;

a second glass substrate having opposite first and second surfaces and disposed such that the first surface opposes the common electrode layer, the first surface having formed thereon a plurality of pixel electrodes and a plurality of switching elements connected to the pixel electrodes respectively;

a display material layer sandwiched between the common electrode layer and the first surface of the second glass substrate on which the plurality of pixel electrodes and the plurality of switching elements are formed;

a glass layer formed on the second surface of the second glass substrate and has a lower melting point than that of the second glass substrate; and

a micro lens array composed of a plurality of micro lenses formed on the glass layer so as to correspond to the plurality of pixel electrodes such that a focal point of each of the plurality of micro lenses is disposed at a corresponding one of the plurality of pixel electrodes, said micro lens array being made of the same glass material as that of the glass layer.

7. The display device according to claim 6, wherein said display material layer comprises a liquid crystal layer.

8. A display device comprising:

a first glass substrate having formed at one surface thereof a common electrode layer;

a second glass substrate having opposite first and second surfaces and disposed such that the first surface opposes the common electrode layer;

an alkali elution preventive layer formed on the first surface of the second glass substrate;

a plurality of pixel electrodes formed on the alkali elution layer and a plurality of switching elements formed on the alkali elution layer and connected to the pixel electrodes respectively;

a display material layer sandwiched between the common electrode layer and the alkali elution layer on which the plurality of pixel electrodes and the plurality of switching elements are formed; and

a micro lens array composed of a plurality of micro lenses formed on the second surface of the second glass substrate so as to correspond to the plurality of pixel electrodes such that a focal point of each of the plurality of micro lenses is disposed at a corresponding one of the plurality of pixel electrodes, said micro lens array being made of a glass having a lower melting point than that of the second glass substrate.

9. The display device according to claim 8, wherein said display material layer comprises a liquid crystal layer.