Display system having curved microlens array between flat matrix display panel and similarly curved viewing screen

• US 6,462,795 B1
• Filed: 07/06/2000
• Issued: 10/08/2002
• Est. Priority Date: 07/12/1999
• Status: Expired due to Fees

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Clarke, John A.
• Primary Examiner(s): Ton, Toan
• Assistant Examiner(s): SCHECHTER, ANDREW M
• Application Number:
  US09/610,718
• Time in Patent Office: 824 Days
• Field of Search: 349/95, 349/11
• US Class Current: 349/95
• CPC Class Codes: G02B 3/0018 Reflow, i.e. characterized by the step of melting microstructures to form curved surfaces, e.g. manufacturing of moulds and surfaces for transfer etching
• CPC Class Codes: G02B 3/0043 Inhomogeneous or irregular arrays, e.g. varying shape, size, height
• CPC Class Codes: G02B 3/0056 arranged along two different directions in a plane, e.g. honeycomb arrangement of lenses G02B3/0043 takes precedence; miniaturised objectives for electronic devices employing wafer level optics G02B13/0085
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133526 Lenses, e.g. microlenses or Fresnel lenses

Abstract

A display system comprises a substantially flat matrix display panel (10), for example an LCD, a viewing screen (12) spaced from the panel and curved in one or more directions, for example to conform with the contour of a support structure (16), and an image transfer arrangement (14) comprising at least one microlens array curved in a similar sense to the screen and disposed between the panel and the screen whose individual lens elements transmit respective portions of the image on the panel onto corresponding positions on the screen. The arrangement may comprise imaging, field and re-imaging arrays (20, 21, 22) in series with corresponding lens elements in the arrays having a common optical axis.

Claims

1. A display system comprising a substantially flat matrix display panel, a curved viewing screen arranged over, and spaced from, the output side of the panel and an optical image transfer arrangement disposed between the curved screen and the output side of the panel and comprising at least one microlens array which is curved in the same general direction as the screen and which has spaced apart lens elements for transmitting respective portions of the image produced at the output side of the panel onto corresponding positions on the curved screen.

2. A display system according to claim 1, wherein the image transfer arrangement comprises a plurality of microlens arrays, each having spaced apart lens elements and with corresponding lens elements in the arrays being optically associated with one another in a group for transmitting and re-imaging respective portions of the image.

3. A display system according to claim 2, wherein the image transfer arrangement comprises, in order from the panel, a first, imaging, microlens array, a second, field, microlens array and a third, re-imaging, microlens array, the first, second and third microlens arrays being arranged such that each lens element in one array is on the same optical axis as a corresponding lens element in each of the other arrays and with each group of corresponding lens elements relaying a respective portion of the image to the viewing screen.

4. A display system according to claim 2, wherein each group of associated lens elements in the plurality of arrays transmits light from a respective group of adjacent pixels of the display panel.

5. A display system according to claim 2, wherein the powers of the individual lens elements in one or more of the arrays vary over the area of the array in accordance with the curvature of the screen.

6. A display system according to claim 3, wherein at least the third, re-imaging, microlens array is curved.

7. A display system according to claim 3, wherein light baffle means are provided adjacent one side of the first microlens array for shielding the light path through the arrays.

8. A display system according to claim 7, wherein the light baffle means are provided between the first and second microlens arrays.

9. A display system according to claim 7, wherein the light baffle means are provided in the form of a honeycomb structure.

10. A display system according to claim 1, wherein the image transfer arrangement includes a further microlens array positioned next to the output side of the display panel and comprising an array of microlenses each of which corresponds to a respective one of the microlenses in the other microlens array(s) and acts as a field lens.

11. A display system according to claim 1, wherein the display panel comprises a liquid crystal display panel.