Liquid crystal display device having a driving circuit inside the seal boundary

• US 5,148,301 A
• Filed: 02/21/1991
• Issued: 09/15/1992
• Est. Priority Date: 02/27/1990
• Status: Expired due to Term

• Current Assignee: Casio Computer Company Limited
• Original Assignee: Casio Computer Company Limited
• Inventors: Sawatsubashi, Takeshi, Okimoto, Hiroyuki, Mawatari, Atsushi
• Primary Examiner(s): Miller, Stanley D.
• Assistant Examiner(s): TRICE, RONALD
• Application Number:
  US07/659,749
• Time in Patent Office: 572 Days
• Field of Search: 359/85, 359/80, 359/59, 359/60
• US Class Current: 349/153
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells
• CPC Class Codes: G02F 1/13454 Drivers integrated on the active matrix substrate G02F1/136277 takes precedence

Abstract

A liquid crystal display device comprises first and second substrates disposed to face each other, first and second electrodes formed on the both substrates to opposed to each other and forming a display region, signal leads formed on the second substrate and connected to the second electrodes, a seal surrounding the display region between the substrates and connecting together the substrates, a driving circuit provided between outer edges of the display region and those of the seal and connected to the leads, for generating a driving signal and supplying the signal to the wires in response to externally input display data, and a liquid crystal material sealed in a space surrounded by the substrates and seal.

Claims

1. A liquid crystal display device comprising:

a first substrate comprising a transparent material;

a common electrode formed on said first substrate;

a second substrate arranged parallel to said first substrate and spaced apart from said first substrate by a predetermined distance;

a plurality of pixel electrodes formed on said second substrate for defining a display region opposing said common electrode;

signal supplying leads electrically coupled to said pixel electrodes, for supplying a driving signal thereto;

a seal member, formed between said first and second substrates at a peripheral portion surrounding said display region, for fixing said first and second substrates together;

a driving circuit, formed between an outer edge of said display region and an outer edge of said seal member and electrically connected to said signal supplying leads, for supplying a driving signal to said pixel electrodes through said signal supplying leads in response to externally input display data; and

a liquid crystal material sealed in an internal space defined by said first and second substrates and said seal member, said liquid crystal material surrounding at least a portion of said driving circuit.

2. A liquid crystal display device according to claim 1, wherein said driving circuit comprises an integrated circuit formed on said second substrate and including a plurality of thin film transistors.

3. A liquid crystal display device according to claim 2, wherein each of said thin film transistors comprises a thin film semiconductor of polysilicon.

4. A liquid crystal display device according to claim 2, wherein each of said thin film transistors comprises a thin film transistor of amorphous silicon.

5. A liquid crystal display device comprising:

a first substrate comprising a transparent material;

a common electrode formed on said first substrate;

a second substrate arranged parallel to said first substrate and spaced apart from said first substrate by a predetermined distance;

a plurality of row lines arranged on said second substrate and extending in a given direction;

a plurality of column lines arranged on said second substrate and extending in a direction transverse to said given direction in which said row lines extend;

a plurality of active elements, each including a thin semiconductor and a pixel electrode, and each being disposed at an intersection of said row and column lines, said plurality of active elements defining a display region opposing said common electrode;

a seal member, formed between said first and second substrates at a peripheral portion surrounding said display region, for fixing said first and second substrates together;

a row line driving circuit formed on said second substrate and electrically coupled to said plurality of active elements through said row lines;

a column line driving circuit formed on said second substrate and electrically coupled to said plurlatiy of active elements through said column lines; and

a liquid crystal material filled in an internal space defined by said first and second substrates and said seal member, said liquid crystal material surrounding at least a portion of said row and column driving circuits.

6. A liquid crystal display device according to claim 5, wherein each of said plurality of active elements comprises a thin film transistor including a source electrode, a drain electrode, a gate insulating film respectively formed on said semiconductor and a gate electrode formed on said gate insulating film, which are laminated on said second substrate.

7. A liquid crystal display device according to claim 6, further comprising a shielding film made of light shielding material and formed on a portion of said second substrate so as to cover at least one of said row line and column line driving circuits.

8. A liquid crystal display device according to claim 5, wherein each of said plurality of active elements comprises a non-linear resistance element having thin films laminated on said second substrate.

9. A liquid crystal display device according to claim 8, wherein said non-linear resistance element comprises a thin film diode.

10. A liquid crystal display device according to claim 5, wherein each of said plurality of active elements comprises a thin film transistor including semiconductor films comprising thin amorphous silicon films formed on said second substrate, and wherein said row line and column line driving circuits comprise an integrated circuit comprising a plurality of thin film transistors using thin polysilicon films.

11. A liquid crystal display device according to claim 5, wherein each of said plurality of active elements comprises a thin film transistor including semiconductor films comprising thin polysilicon films formed on said second substrate, and wherein said row line and column line driving circuits comprise an integrated circuit comprising a plurality of thin film transistors including thin polysilicon films.