DISPLAY DEVICE WITH CHIPLETS AND LIGHT SHIELDS

• US 20100201253A1
• Filed: 02/11/2009
• Published: 08/12/2010
• Est. Priority Date: 02/11/2009
• Status: Active Grant

• Current Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Original Assignee: Global OLED Technology LLC (LG Display Co., Ltd.)
• Inventors: Parrett, Gary J., Cok, Ronald S.
• Granted Patent: US 7,994,714 B2
• Time in Patent Office: Days
• US Class Current: 313/498
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/126 Shielding, e.g. light-blocking means over the TFTs
• CPC Class Codes: H10K 59/129 Chiplets

Abstract

A light-emitting diode display device includes a transparent substrate; a plurality of chiplets located over the substrate between a transparent electrode and the substrate, each chiplet including drive circuitry for driving pixels to emit light and including a storage capacitor for storing charge and wherein light illumination of at least a portion of the drive circuit causes the capacitor to leak charge; a connection pad forming a first light shield separate from the drive circuitry located on the surface of each chiplet disposed over the drive circuitry and substantially shielding at least a portion of the drive circuitry from illumination, the connection pad electrically connected to the drive circuitry, and a second light shield disposed under the drive circuitry between the drive circuitry and the substrate to shield at least a portion of the drive circuitry from illumination.

Claims

1. A light-emitting diode display device, comprising:

a) a transparent substrate;

b) a plurality of pixels formed on the substrate, each pixel including a transparent electrode formed over the transparent substrate, one or more layers of light-emitting material formed over the transparent electrode, and an electrode formed over the one or more layers of light-emitting material;

c) a plurality of chiplets located over the substrate between the transparent electrode and the substrate, each chiplet including drive circuitry for driving the pixel to emit light, the drive circuitry including a storage capacitor for storing charge and wherein light illumination of at least a portion of the drive circuit causes the capacitor to leak charge;

d) a connection pad forming a first light shield separate from the drive circuitry located on the surface of each chiplet disposed over the drive circuitry and substantially shielding at least a portion of the drive circuitry from illumination, the connection pad electrically connected to the drive circuitry; and

e) a second light shield disposed under the drive circuitry between the drive circuitry and the substrate to shield at least a portion of the drive circuitry from illumination.

2. The light-emitting diode display device of claim 1, wherein the illumination is ambient illumination originating externally to the light-emitting diode display device.

3. The light-emitting diode display device of claim 1, wherein the illumination is light emitted by the one or more layers of light-emitting material.

4. The light-emitting diode display device of claim 1, wherein the first and second light shields shield the capacitor from illumination.

5. The light-emitting diode display device of claim 1, wherein the second light shield includes a patterned metal layer formed on the substrate in the area of the chiplets.

6. The light-emitting diode display device of claim 1, wherein the second light shield includes a patterned black resin layer formed on the substrate in the area of the chiplets.

7. The light-emitting diode display device of claim 6, wherein the patterned black resin layer includes an adhesive.

8. The light-emitting diode display device of claim 1, wherein the second light shield includes a black material layer applied to the side of the chiplets between the drive circuitry and the substrate.

9. The light-emitting diode display device of claim 1, wherein the second light shield includes a metal layer within the chiplet.

10. The light-emitting diode display device of claim 1, wherein the connection pad includes a metal layer.

11. The light-emitting diode display device of claim 1, wherein the chiplet comprises silicon and has a thickness less than 50 microns.

12. The light-emitting diode display device of claim 1, wherein the chiplet comprises silicon and has a thickness less than 25 microns.

13. The light-emitting diode display device of claim 1, wherein the chiplet comprises silicon and has a thickness less than 15 microns.

14. The light-emitting diode display device of claim 1, wherein the second light shield extends beyond the chiplet.

15. The light-emitting diode display device of claim 1, wherein the light-emitting diode display is an organic light-emitting diode display.

16. The light-emitting diode display device of claim 1, wherein the drive circuitry further includes a control transistor and wherein the control transistor is shielded from illumination by the first or second light shields.

17. The light-emitting diode display device of claim 1, wherein the drive circuitry further includes a drive transistor and wherein the drive transistor is shielded from illumination by the first or second light shields.

18. The light-emitting diode display device of claim 1, wherein the electrode is reflective and the substrate is parent.

19. The light-emitting diode display device of claim 1, wherein the electrode is transparent and the substrate is opaque or transparent.