Backlit displays

• US 20060268195A1
• Filed: 05/15/2006
• Published: 11/30/2006
• Est. Priority Date: 06/19/1998
• Status: Active Grant

• Current Assignee: Cambridge Display Technology Limited (Sumitomo Chemical Company Limited)
• Original Assignee: Cambridge Display Technology Limited (Sumitomo Chemical Company Limited)
• Inventors: Carter, Julian Charles, Heeks, Stephen Karl
• Granted Patent: US 7,402,091 B2
• Time in Patent Office: Days
• US Class Current: 349/69
• CPC Class Codes: G02F 1/133603 with LEDs
• CPC Class Codes: G09G 2310/0235 Field-sequential colour display
• CPC Class Codes: G09G 2310/024 Scrolling of light from the illumination source over the display in combination with the scanning of the display screen
• CPC Class Codes: G09G 3/3413 Details of control of colour illumination sources
• CPC Class Codes: G09G 3/342 using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
• CPC Class Codes: G09G 3/3622 using a passive matrix G09G3/3674 - G09G3/3696 take precedence
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/852 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 59/50 OLEDs integrated with light modulating elements, e.g. with electrochromic elements, photochromic elements or liquid crystal elements
• CPC Class Codes: H10K 59/876 comprising a resonant cavity structure, e.g. Bragg reflector pair
• CPC Class Codes: H10K 71/135 using ink-jet printing

Abstract

A display device comprising: a light switching unit comprising an array of pixels each operable to vary the transmission of light therethrough; and a backlight comprising a first series of regions of organic light-emissive material having a first emission color and a second series of regions of organic light-emissive material having a second emission color, each region of organic material being located so as to lie behind a plurality of pixels of the array in the viewing direction for backlighting those pixels; and at least one of the regions of organic light-emissive material being formed by a process of ink-jet deposition.

Claims

1-28. -28. (canceled)

29. A method of forming a light-emissive unit of a display device comprising:

providing a first electrode;

depositing an organic light emissive layer over the first electrode, wherein;

the organic light emissive layer comprises a small molecule emissive material,

the organic light emissive layer is a patterned layer deposited by solution processing; and

depositing a second electrode over the organic light emissive layer.

30. The method of claim 29, wherein the organic light emissive layer is deposited by a process of ink-jet deposition.

31. The method of claim 29, wherein the organic light emissive patterned layer comprises regions of red, green and blue light emissive materials.

32. The method of claim 29 including:

depositing a charge transport layer between the organic light emissive layer and the first electrode; and

depositing the organic light emissive layer over and in physical contact with the charge transport layer.

33. The method of claim 30, wherein the charge transport layer comprises one or more polymers.

34. The method of claim 33, wherein the one or more polymers comprises polystyrene sulphonic acid doped polyethylene dioxythiophene (PDOT:

PSS) and/or poly(2,7-(9,9-di-n-octylfluorene)-(1,4-phenylene-(4-imino(benzoic acid))1,4-phenylene-(4-imino(benzoic acid))-1,4-phenylene))(BFA) and/or polyaniline and/or PPV.

35. The method of claim 32, wherein the charge transport layer is patterned.

36. The method of claim 35, wherein the charge carrier transport layer is deposited by a process of ink-jet deposition.

37. A display device comprising:

a first electrode;

a small molecule organic light emissive layer deposited over the first electrode, wherein;

the small molecule organic light emissive layer is a patterned layer deposited by solution processing; and

a second electrode deposited over the organic light emissive layer.