Active matrix display device

• US 6,037,923 A
• Filed: 03/17/1997
• Issued: 03/14/2000
• Est. Priority Date: 03/19/1996
• Status: Expired due to Term

• Current Assignee: Japan Display Central Incorporated (Japan Display Incorporated)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Suzuki, Koji
• Primary Examiner(s): Hjerpe, Richard A.
• Assistant Examiner(s): Laneau, Ronald
• Application Number:
  US08/819,191
• Time in Patent Office: 1,093 Days
• Field of Search: 345/92, 345/90, 345/94, 345/96, 345/100, 349/47
• US Class Current: 345/92
• CPC Class Codes: G09G 2300/0408 Integration of the drivers onto the display substrate
• CPC Class Codes: G09G 2300/0876 Supplementary capacities in pixels having special driving circuits and electrodes instead of being connected to common electrode or ground; Use of additional capacitively coupled compensation electrodes
• CPC Class Codes: G09G 3/3648 using an active matrix G09G3/367 - G09G3/3696 take precedence

Abstract

With this active matrix display device, in a liquid crystal display panel comprising an array substrate (1) on which there are formed, on the same substrate, thin film transistors (11) respectively connected to two-dimensionally arranged pixel electrodes and drive circuits (2,3) that drive them, a counter substrate arranged facing this array substrate (1), and a liquid crystal layer (12) inserted between array substrate (1) and the counter substrate, part of the power source supply wiring of drive circuits (2, 3) is formed by reference potential wirings (Cs lines) (20) of storage capacitors (14) provided at each pixel in the display region, thereby enabling lowering of the resistance of the power source wiring of the power source applied to the drive circuits to be achieved without increasing the border region, and enabling the border region to be made narrow and reliability to be improved.

Claims

1. An active matrix display device comprising

an insulating substrate divided into a display region and a non-display region;

a plurality of active elements arranged in matrix fashion on the insulating substrate in the display region and a plurality of pixel electrodes each connected to one of the active elements, the pixel electrodes being in the display region;

an address drive circuit, in the non-display region, for controlling the active elements by supplying an address signal to the active elements;

a data drive circuit in the non-display region, for supplying picture data to the active elements;

a counter electrode facing the pixel electrodes;

a liquid crystal layer between the counter electrode and the pixel electrodes, the optical transmittance of the liquid crystal layer varying according to an electrical field applied between the pixel electrodes and the counter electrode; and

a power source supply wiring, in the display region, for supplying a power source potential to the address drive circuit or the data drive circuit.

2. The active matrix display device according to claim 1, wherein:

the active elements each includes a TFT having a polycrystalline semiconductor channel region.

3. The active matrix display device according to claim 1, wherein:

the power source supply wiring is connected, at a plurality of locations, to the address drive circuit or the data drive circuit to supply the power source potential in a substantially stable manner.

4. The active matrix display device according to claim 3, wherein the power source potential, is higher or lower than a ground potential.

5. The active matrix display device according to claim 4, further comprising a second power source supply wiring, in the display region, for supplying the ground potential to the address drive circuit or the data drive circuit.

6. An active matrix display device comprising:

an insulating substrate divided into a display region and a non-display region;

a plurality of active elements arranged in matrix fashion on the insulating substrate in the display region and a plurality of pixel electrodes each connected to one of the active elements, the pixel electrodes being in the display region;

an address drive circuit, in the non-display region, for controlling the active elements by supplying an address signal to the active elements;

a data drive circuit in the non-display region, for supplying picture data to the active elements;

a counter electrode facing the pixel electrodes;

a liquid crystal layer between the counter electrode and the pixel electrodes, the optical transmittance of the liquid crystal layer varying according to an electrical field applied between the pixel electrodes and the counter electrode; and

Cs lines, in the display region, for supplying a DC power source potential to the address drive circuit or the data drive circuit, the Cs lines defining storage capacitors between each pixel electrode and a corresponding Cs line and the Cs lines being between the substrate and the counter electrode.

7. The active matrix display device according to claim 6, wherein the active elements and address drive circuit are connected by a plurality of address lines in parallel on the insulating substrate within the display region and the active elements and the data drive circuit are connected by a plurality of data lines in parallel running along the address lines on the insulating substrate in the display region.

8. The active matrix display device according to claim 7, wherein the active elements and the drive circuit include TFTs formed on the insulating substrate with a channel region of polycrystalline silicon.

9. The active matrix display device according to claim 8, wherein the address drive circuit is divided between the non-display regions to the left and right of the display region, these divided parts being connected by address lines passing through the display region.

10. The active matrix display device according to claim 8, further comprising power supply wiring in the non-display region wherein the Cs lines and the power source supply wiring are connected at two points at opposite sides of the display region, to define a four-sided rectangular shape.

11. An active matrix display device comprising:

an insulating substrate divided into a display region and a non-display region;

a plurality of active elements arranged in matrix fashion on the insulating substrate in the display region and a plurality of pixel electrodes connected to one of the active elements, the pixel electrodes being in the display region;

an address drive circuit, in the non-display region, for controlling the active elements by supplying an address signal to the active elements;

a data drive circuit in the non-display region, for supplying picture data to the active elements, wherein the active elements and address drive circuit are connected by a plurality of address lines in parallel on the insulating substrate within the display region, the active elements and the data drive circuit being connected by a plurality of data lines in parallel running along the address lines on the insulating substrate in the display region, and the active elements and the drive circuit include TFTs formed on the insulating substrate with a channel region of polycrystalline silicon;

a counter electrode facing the pixel electrodes;

a liquid crystal layer between the counter electrode and the pixel electrodes, an optical transmittance of the liquid crystal layer varying according to an electric field applied between the pixel electrodes and the counter electrode; and

Cs lines, in the display region, for supplying a power source potential to the address drive circuit or the data drive circuit, the Cs lines defining storage capacitors between each pixel electrode and a corresponding Cs line, the Cs lines being between the substrate and the counter electrode;

wherein the Cs lines are divided into at least three groups, a first group for supplying a ground potential, a second group for supplying a second potential higher or lower than the ground potential, and a third group for supplying a potential between the ground potential and the second potential.

12. The active matrix display device according to claim 11, wherein the address drive circuit is divided between the non-display regions to the left and right of the display region, these divided parts being connected by address lines passing through the display region.

13. The active matrix display device comprising:

an insulating substrate divided into a display region and a non-display region;

a plurality of active elements arranged in matrix fashion on the insulating substrate in the display region and a plurality of pixel electrodes each connected to one of the active elements, the pixel electrodes being in the display region;

an address drive circuit, in the non-display region, for controlling the active elements by supplying an address signal to the active elements;

a data drive circuit in the non-display region, for supplying picture data to the active elements;

a counter electrode facing the pixel electrodes;

a liquid crystal layer between the counter electrode and the pixel electrodes, the optical transmittance of the liquid crystal layer varying according to an electrical field applied between the pixel electrodes and the counter electrode; and

a black matrix on the display region that supplies power source potential to the address drive circuit or the data drive circuit, the black matrix being at least between the pixel electrodes.

14. The active matrix display device according to claim 13, wherein the black matrix and the power source supply wiring for the data drive circuit are simultaneously connected with one side and the other side in the vicinity of two different sides of the display region, which presents a four-sided rectangular shape.

15. The active matrix display device according to claim 13, wherein the active elements and address drive circuit are connected by a plurality of address lines in parallel on the insulating substrate within the display region, and the active elements and the data drive circuit are connected by a plurality of data lines running along the address lines on the insulating substrate within the display region.

16. The active matrix display device according to claim 15, wherein the data drive circuit is divided between non-display regions above and below the display region, these divided parts being connected by data line passing through the display region.

17. The active matrix display device according to claim 15, wherein the black matrix is superimposed on the data lines and forms capacitive coupling with the data lines.

18. An active matrix display device comprising:

an insulating substrate divided into a display region and a non-display region;

a plurality of active elements arranged in matrix fashion on the insulating substrate in the display region and a plurality of pixel electrodes connected to one of the active elements, the pixel electrodes being in the display region;

an address drive circuit, in the non-display region, for controlling the active elements by supplying an address signal to the active elements;

a data drive circuit in the non-display region, for supplying picture data to the active elements, wherein the active elements and address drive circuit are connected by a plurality of address lines in parallel on the insulating substrate within the display region, and the active elements and the data drive circuit are connected by a plurality of data lines running along the address lines on the insulating substrate within the display region;

a counter electrode facing the pixel electrodes;

a liquid crystal layer between the counter electrode and the pixel electrodes, an optical transmittance of the liquid crystal layer varying according to an electric field applied between the pixel electrodes and the counter electrode; and

a black matrix on the display region that supplies power source potential to the address drive circuit or the data drive circuit, the black matrix being at least between the pixel electrodes;

wherein the black matrix is divided into at least three groups, a first group for supplying a ground potential, a second group for supplying a second potential higher or lower than the ground potential, and a third group for supplying a potential between the ground potential and the second potential.

19. The active matrix display device according to claim 18, wherein the black matrix and the power source supply wiring for the data drive circuit are simultaneously connected with one side and the other side in the vicinity of two different sides of the display region, which presents a four-sided rectangular shape.

20. The active matrix display device according to claim 18, wherein the data drive circuit is divided between non-display regions above and below the display region, these divided parts being connected by data line passing through the display region.

21. The active matrix display device according to claim 18, wherein the black matrix is superimposed on the data lines and forms capacitative coupling with the data lines.

22. The active matrix display device comprising;

an insulating substrate having two opposite main surfaces, the middle part of one main surface constituting a display region while the rest constitutes a non-display region;

a plurality of pixels in the display region;

a drive circuit, in the non-display region, for driving the pixels;

a power source supply wiring, in the non-display region, for supplying a power source potential to the drive circuit; and

a cross wiring, in the display region, connected at a plurality of locations to the power source supply wiring.

23. The active matrix display device according to claim 22, further comprising a plurality of cross wirings arranged in groups, each group for supplying a different supply potential.

24. The active matrix display device according to claim 23, wherein the power source supply wiring of the drive circuits and the cross wiring groups are simultaneously connected at one side and another side at two different sides of said display region, which defines a four-sided rectangular shape.

25. The active matrix display device according to claim 23, wherein the pixels and the drive circuits include TFTs whose channel regions comprise polycrystalline silicon.

26. The active matrix display device according to claim 23, wherein the power source potential is higher or lower than a ground potential.