Display, portable device, and substrate

• US 6,937,222 B2
• Filed: 01/03/2002
• Issued: 08/30/2005
• Est. Priority Date: 01/18/2001
• Status: Expired due to Term

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Numao, Takaji
• Primary Examiner(s): Wu, Xiao
• Assistant Examiner(s): Nguyen, Kevin M.
• Application Number:
  US10/034,251
• Publication Number:
  US 20020093472A1
• Time in Patent Office: 1,335 Days
• Field of Search: 345/90, 345/91, 345/92, 345/96, 345/97, 345/204, 345/205, 345/206, 345/207, 345/76, 345/82, 345/98, 345/89
• US Class Current: 345/98
• CPC Class Codes: G09G 2300/0814 used for selection purposes, e.g. logical AND for partial update
• CPC Class Codes: G09G 2300/0828 forming a digital to analog [D/A] conversion circuit
• CPC Class Codes: G09G 2300/0838 with level shifting
• CPC Class Codes: G09G 2300/0857 Static memory circuit, e.g. flip-flop
• CPC Class Codes: G09G 2310/0262 The addressing of the pixel, in a display other than an active matrix LCD, involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependent on signals of two data electrodes
• CPC Class Codes: G09G 2310/061 for resetting or blanking
• CPC Class Codes: G09G 2320/0261 in the context of movement of objects on the screen or movement of the observer relative to the screen
• CPC Class Codes: G09G 3/2011 by amplitude modulation
• CPC Class Codes: G09G 3/2022 using sub-frames
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence
• CPC Class Codes: G09G 3/3659 the addressing of the pixel involving the control of two or more scan electrodes or two or more data electrodes, e.g. pixel voltage dependant on signal of two data electrodes

Abstract

A memory circuit is caused to retain a voltage corresponding to largest tone data, then a voltage corresponding to tone data except for the largest tone data is applied to a liquid crystal element, and the voltage corresponding to the largest tone data is supplied from the memory circuit to the liquid crystal element. The development of moving picture breakups can be suppressed with a display producing a time-division gray-scale display, without having to carry out a display scanning operation for every display.

Claims

1. A display, comprising:

electro-optic elements; and

memory means and potential maintaining means both provided for each of the electro-optic elements,

wherein;

a display operation by the electro-optic elements is controlled using outputs from the memory means and the potential maintaining means;

the electro-optic elements are provided near intersections of first wires and second wires provided in a direction crossing the first wires,

the display further comprising;

first switching element for each pixel, each first switching element being electrically connected at a first terminal thereof to one of the first wires; and

second switching element for each pixel, each second switching element being electrically connected in series with the memory means and a second terminal of the first switching element,

wherein, for a given pixel in the display, the second terminal of the corresponding first switching element is electrically connected to the potential maintaining means.

2. The display as set forth in claim 1, further comprising:

third switching element for each pixel, each third switching element being electrically connected in series with the potential maintaining means.

3. The display as set forth in claim 1, wherein the memory means is connected to a switching element which switches between an output from the memory means and an output from the potential maintaining means.

4. The display of claim 1, wherein the outputs from the memory means and/or the potential maintaining means are supplied to the electro-optic elements for a period corresponding to a weight of data stored in the memory means and/or the potential maintaining means.

5. The display of claim 4, wherein the potential maintaining means is a liquid crystal element including liquid crystal material sandwiched between at least first and second opposing electrodes.

6. The display as set forth in claim 1, wherein the electro-optic elements produce a display based on a voltage corresponding to a weight of data stored in the memory means or the potential maintaining means.

7. The display as set forth in claim 1, wherein the electro-optic elements produce a display based on a current corresponding to a weight of data stored in the memory means or the potential maintaining means.

9. The display of claim 1, further comprising second memory means, provided outside a pixel area, for recording a signal from which the electro-optic elements produce a display.

10. The display as set forth in claim 9, wherein a display is produced from a signal recorded in the memory means and a signal supplied from the second memory means to the potential maintaining means.

11. The display as set forth in claim 9, wherein a display is produced from a signal recorded in the memory means and a signal supplied from the second memory means to the potential maintaining means by switching between multiple video images.

12. The display of claim 9, wherein the potential maintaining means is a liquid crystal element including liquid crystal material sandwiched between at least first and second opposing electrodes.

13. The display as set forth in claim 1, wherein the electro-optic elements are organic LED elements.

14. The display of claim 1, wherein the potential maintaining means is a liquid crystal element including liquid crystal material sandwiched between at least first and second opposing electrodes.

8. The display of claiim 1, further comprising sixth switching elements each interposed between the potential maintaining means and either a power source wire or a ground wire.

15. A display, comprising:

electro-optic elements; and

memory means and potential maintaining means both provided for each of the electro-optic elements,

wherein;

a display operation by the electro-optic elements is controlled using outputs from the memory means and the potential maintaining means;

wherein the electro-optic elements are provided near intersections of first wires and second wires provided in a direction crossing the first wires,

the display further comprising;

first switching element for each pixel, each first switching element being electrically connected at a first terminal thereof to one of the first wires and electrically connected at a second terminal thereof to the memory means; and

fourth switching element for each pixel, each fourth switching element being electrically connected at a first terminal thereof to one of the first wires and electrically connected at a second terminal thereof to the potential maintaining means.

16. The display as set forth in claim 15, further comprising fifth switching element for each pixel, each fifth switching element being interposed between one of the electro-optic elements and the memory means.