Organic electronic device having improved homogeneity

• US 7,385,572 B2
• Filed: 08/22/2003
• Issued: 06/10/2008
• Est. Priority Date: 09/09/2002
• Status: Expired due to Fees

• Current Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Yu, Gang, Wang, Jian, Stevenson, Matthew, Zhang, Weixiao
• Primary Examiner(s): LEWIS, DAVID LEE
• Application Number:
  US10/646,306
• Publication Number:
  US 20040183759A1
• Time in Patent Office: 1,754 Days
• Field of Search: 345/36, 345 55-100, 345204-207, 315/169.1, 315/169.3
• US Class Current: 345/76
• CPC Class Codes: G02B 6/43 Arrangements comprising a plurality of opto-electronic elements and associated optical interconnections
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2320/0285 using tables for spatial correction of display data
• CPC Class Codes: G09G 2320/043 Preventing or counteracting the effects of ageing
• CPC Class Codes: G09G 2320/046 Dealing with screen burn-in prevention or compensation of the effects thereof
• CPC Class Codes: G09G 2320/0626 for control of overall brightness
• CPC Class Codes: G09G 2320/0693 Calibration of display systems
• CPC Class Codes: G09G 2360/147 the originated light output being determined for each pixel
• CPC Class Codes: G09G 2360/148 the light being detected by light detection means within each pixel
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: H10K 50/856 comprising reflective means
• CPC Class Codes: H10K 59/13 comprising photosensors that control luminance
• CPC Class Codes: H10K 59/17 Passive-matrix OLED displays
• CPC Class Codes: H10K 59/878 comprising reflective means

Abstract

A display for an electronic device may be calibrated and corrected for pixel-to-pixel variations in intensity. Radiation-sensing elements used for the calibration are not incorporated as circuit elements within the pixel circuits and may lie outside the pixels. Waveguides, reflectors, or the like may be used to optically couple the radiation-emitting elements of the pixels to the radiation-sensing elements. The radiation-sensing elements may be part of an apparatus separate from the electronic device or may be embedded within the electronic device. Many different methodologies may be used for correcting intensities to achieve better homogeneity in intensity among the pixels within a display.

Claims

1. An electronic device comprises:

a first radiation-emitting element lying within a pixel; and

a first radiation-sensing element for sensing radiation emitted from the first radiation-emitting element wherein;

the first radiation-sensing element lies outside the pixel;

the radiation-sensing element is part of a calibrating system; and

the radiation-sensing element is not part of a radiation-emitting circuit; and

the radiation-sensing element is located outside the projected area containing the radiation-emitting element.

2. The electronic device of claim 1, wherein the first radiation-sensing element lies at a location selected from:

between the first radiation-emitting element and the user side of the electronic device; and

farther from the user side of the electronic device compared to the first radiation-emitting element.

3. The electronic device of claim 1, further comprising a waveguide, wherein the waveguide optically couples the first radiation-emitting element to the first radiation-sensing element.

4. The electronic device of claim 3, wherein the waveguide lies at a location selected from:

between the first radiation-emitting element and the user side of the electronic device; and

farther from the user side of the electronic device compared to the first radiation-emitting element.

5. The electronic device of claim 3, wherein:

the electronic device includes a plurality of radiation-emitting elements, including the first radiation-emitting element, within an array;

the array has an array edge;

the waveguide has a waveguide edge adjacent to the array edge; and

the first radiation-sensing element is connected to the waveguide edge.

6. The electronic device of claim 3, wherein:

the electronic device includes a plurality of radiation-emitting elements, including the first radiation-emitting element, within an array;

the array has array edges;

the waveguide has waveguide edges adjacent to the array edges; and

a plurality of radiation-sensing elements, including the first radiation-sensing element, is connected to the waveguide edges.

7. The electronic device of claim 1, wherein the first radiation-emitting element is not electrically connected to the first radiation-sensing element.

8. The electronic device of claim 1, wherein the first radiation-emitting element is not electrically coupled to the first radiation-sensing element.

9. An electronic device comprises:

a first radiation-emitting element;

a waveguide; and

a first radiation-sensing element, wherein;

the waveguide optically couples the first radiation-emitting element to the first radiation-sensing element;

the radiation-sensing element is not part of a radiation-emitting circuit; and

the radiation-sensing element is part of a calibrating system; and

the radiation-sensing element is located outside the projected area containing the radiation-emitting element.

10. The electronic device of claim 9, wherein the waveguide lies at a location selected from:

between the first radiation-sensing element and the user side of the electronic device; and

farther from the user side of the electronic device compared to the first radiation-sensing element.

11. The electronic device of claim 9, wherein:

the electronic device includes a plurality of radiation-emitting elements, including the first radiation-emitting element within an array;

the array has an array edge;

the waveguide has a waveguide edge adjacent to the array edge; and

the first radiation-sensing element is connected to the waveguide edge.

12. The electronic device of claim 9, wherein:

the electronic device includes a plurality of radiation-emitting elements, including the first radiation-emitting element, within an array;

the array has array edges;

the waveguide has waveguide edges adjacent to the array edges; and

a plurality of radiation-sensing elements, including the first radiation-sensing element, is connected to the waveguide edges.

13. The electronic device of claim 9, wherein the first radiation-emitting element comprises a transparent anode and a transparent cathode.