Image recording apparatus utilizing an ECB mode liquid crystal

• US 4,842,379 A
• Filed: 11/13/1987
• Issued: 06/27/1989
• Est. Priority Date: 11/13/1986
• Status: Expired due to Term

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation), Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Fuji Photo Film Co Limited (Fujifilm Holdings Corporation), Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Akimoto, Kazuhiko, Yanagihara, Kazuhiko, Oishi, Hisao, Nakamura, Takeshi, Miyakawa, Tadashi, Shioji, Mitsuaki
• Primary Examiner(s): Miller, Stanley D.
• Assistant Examiner(s): Mai, Huy Kim
• Application Number:
  US07/120,451
• Time in Patent Office: 592 Days
• Field of Search: 350/347 V, 350/347 E, 350/335
• US Class Current: 349/2
• CPC Class Codes: B41J 2/465 using masks, e.g. light-switching masks
• CPC Class Codes: G02F 1/13473 for wavelength filtering or for colour display without the use of colour mosaic filters
• CPC Class Codes: G02F 1/1393 the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells G02F1/1396, G02F1/141 take precedence
• CPC Class Codes: G06K 15/1252 using an array of light modulators, e.g. a linear array

Abstract

A color image recording apparatus employing a liquid crystal shutter array in which a color picture can be recorded with high quality using a small-sized apparatus and without requiring complex operations. A liquid crystal shutter array of the apparatus includes pixel electrodes and a shutter common electrode disposed in opposition to the pixel electrodes with a gap therebetween filled with a liquid crystal, a pair of transparent substrates supporting the pixel electrodes and the shutter common electrode by sandwiching the pixel electrodes and the shutter common electrode therebetween, and polarization plates stacked on the respective outsides of the transparent plates. A color liquid crystal layer is stacked on the liquid crystal shutter array constituted by first and second common electrodes disposed in opposition to each other with the gap therebetween filled with an ECB mode liquid crystal, and a pair of transparent substrates supporting the common electrodes.

Claims

1. An image recording apparatus comprising:

a liquid crystal shutter array comprising a plurality of pixel electrodes and a shutter common electrode disposed in opposition to said pixel electrodes with a gap therebetween, a liquid crystal filling said gap, a pair of transparent substrates for supporting said pixel electrodes and said shutter common electrode by sandwiching said pixel electrodes and said shutter common electrode therebetween, and polarization plates respectively stacked on the respective outsides of said transparent substrates;

a color liquid crystal layer stacked on said liquid crystal shutter array constituted by a first and a second common electrode disposed in opposition to each other with a gap therebetween, an ECB mode liquid crystal filling said gap between said first and second common electrodes, and a pair of transparent substrates for supporting said first and second common electrodes by sandwiching said first and second common electrodes therebetween; and

voltage application means for applying a predetermined voltage between said first and second common electrodes of said color liquid crystal layer.

2. An image recording apparatus according to claim 1, wherein said voltage application means selects said predetermined voltage from voltages respectively corresponding to red, green and blue colors.

3. An image recording apparatus according to claim 1, further comprising means for changing a time period for the opening of said shutter array in correspondence with the voltage applied to the common electrodes of the color liquid crystal layer.

4. An image recording apparatus according to claim 3, further comprising a polarization plate (46) on one of the pair of the transparent substrates of the color liquid crystal layer.

5. An image recording apparatus according to claim 3, wherein the color liquid crystal layer is stacked on a light incident side of said liquid crystal shutter array.

6. An image recording apparatus according to claim 3, wherein the color liquid crystal layer is stacked on a light exit side of said liquid crystal shutter array.

7. An image recording apparatus comprising:

a liquid crystal shutter array comprising a plurality of pixel electrodes and a common electrode disposed in opposition to said pixel electrodes with a gp therebetween, a liquid crystal filling said gap, a first transparent substrate for supporting said pixel electrodes, and a polarization plate stacked on a side of said transparent substrate opposite said pixel electrodes;

a color liquid crystal layer stacked on said liquid crystal shutter array and comprising a first electrode disposed in opposition to said common electrode with a gap therebetween, an ECB mode liquid crystal filling said gap between said first and common electrodes, and a second transparent substrate for supporting said first electrode; and

voltage application means for applying a predetermined voltage between said first and common electrodes.

8. A method of color image recording, comprising the steps of:

applying light to a color liquid crystal layer (40) containing an ECB mode liquid crystal;

applying a first predetermined voltage between a pair of common electrodes (43,

     44) of the color liquid crystal layer to permit passage through said layer of light having a first color corresponding to said first predetermined voltage, said first color being selected from the group consisting of the colors red, green and blue;

applying light of said first color which has passed through said liquid crystal layer to a liquid crystal shutter array (30) during a first period of time while opening selected first portions of said liquid crystal shutter array 30;

applying a second predetermined voltage between said common electrodes of the color liquid crystal layer to permit passage through said layer of light having a second color corresponding to said second predetermined voltage, said second color being selected from the group consisting of the colors red, green and blue;

applying light of said second color which has passed through said liquid crystal layer to said liquid crystal shutter array during a second period of time while opening selected first portions of said liquid crystal shutter array 30;

applying a third predetermined voltage between said common electrodes of the color liquid crystal layer to permit passage through said layer of light having a third color corresponding to said third predetermined voltage, said third color being selected from the group consisting of the colors red, green and blue;

applying light of said third color which has passed through said liquid crystal layer to said liquid crystal shutter array during a third period of time while opening selected first portions of said liquid crystal shutter array 30; and

recording a color image in accordance with light passed by said liquid crystal shutter during said first, second and third periods of time.

9. A method of color image recording, comprising the steps of:

applying white light to a liquid crystal shutter array (30) while opening selected first portions of said liquid crystal shutter array 30;

applying light which has passed through said liquid crystal shutter to a liquid crystal layer (40) during a first period of time while applying a first predetermined voltage between a pair of common electrodes (43,

     44) of the color liquid crystal layer to permit passage through said layer of light having a first color corresponding to said first predetermined voltage, said first color being selected from the group consisting of the colors red, green and blue;

applying light which has passed through said liquid crystal shutter to said liquid crystal layer during a second period of time while applying a second predetermined voltage between said common electrodes of the color liquid crystal layer to permit passage through said layer of light having a second color corresponding to said second predetermined voltage, said second color being selected from the group consisting of the colors red, green and blue;

applying light which has passed through said liquid crystal shutter to said liquid crystal layer during a third period of time while applying a third predetermined voltage between said common electrodes of the color liquid crystal layer to permit passage through said layer of light having a third color corresponding to said third predetermined voltage, said third color being selected from the group consisting of the colors red, green and blue; and

recording a color image in accordance with light passed by said liquid crystal shutter during said first, second and third periods of time.