Light-emitting diode indicator and display panel using the same

• US 5,521,587 A
• Filed: 10/28/1993
• Issued: 05/28/1996
• Est. Priority Date: 07/10/1991
• Status: Expired due to Fees

• Current Assignee: ROHM Co., Ltd.
• Original Assignee: ROHM Co., Ltd.
• Inventors: Sawabe, Tsutomu, Ishinaga, Hiroki
• Primary Examiner(s): Hjerpe, Richard
• Assistant Examiner(s): WU, XIAO MIN
• Application Number:
  US08/144,725
• Time in Patent Office: 943 Days
• Field of Search: 340/815.45, 340/815.53, 340/815.75, 345/39, 345/46, 345/82, 362/351, 362/353, 362/359, 362/361, 362/365, 362/366, 362/368, 40/554, 40/574
• US Class Current: 340/815.45
• CPC Class Codes: F21W 2111/02 for roads, paths or the like
• CPC Class Codes: G09F 13/0472 Traffic signs
• CPC Class Codes: G09F 13/22 electroluminescent electroluminescent light sources per se H05B33/00
• CPC Class Codes: G09F 27/008 Sun shades, shades, hoods or louvres on electronic displays to minimise the effect of direct sun light on the display
• CPC Class Codes: G09F 9/33 being semiconductor devices, e.g. diodes

Abstract

A plurality of light-emitting diode elements are disposed in a generally cylindrical outer frame of an indicator main body. Recesses are formed on the outer surface of the outer frame so as to be arranged in its circumferential and longitudinal directions. Several ribs are formed on the inner surface of a hood so as to be arranged in its circumferential direction. The ribs of the hood are fitted in selected ones of the recesses of the outer frame to form an indicator. A display panel is constituted by two-dimensionally arranging a large number of the above indicators on a base.

Claims

1. A light-emitting diode indicator comprising:

an indicator main body having an outer frame and a plurality of light-emitting diode elements disposed in the outer frame;

a hood to be mounted circumferentially around the outer frame of the main body; and

mounting means comprising spaced interengageable detent means including a plurality of circumferentially spaced projections and recesses provided in the main body and in the hood and resilient means for urging the detent means into engagement so that the hood may be circumferentially positioned and releasably locked on the outer frame of the main body at any of a plurality of circumferentially spaced positions determined by the detent means to shield the light emitting diode elements from ambient light incident in a selected circumferential direction.

2. The indicator of claim 1, wherein the outer frame assumes a generally cylindrical form.

3. The indicator of claim 2, wherein the spaced interengageable detent means includes a plurality of recesses spaced in a longitudinal direction of the outer frame.

4. The indicator of claim 1, wherein the mounting means comprises a rib formed on an inner surface of the hood and a plurality of recesses formed on an outer surface of the outer frame, and wherein the rib of the hood is fitted in one of the plurality of recesses of the outer frame.

5. The indicator of claim 2, wherein the hood comprises a visor portion for shielding, when the hood is mounted on the outer frame of the main body, the light-emitting diode elements from ambient light, and a pair of flexible wings for elastically engaging the hood with the outer frame.

6. A display panel comprising a plurality of light-emitting diode indicators arranged two-dimensionally, each of the indicators comprising:

an indicator main body having an outer frame and a plurality of light-emitting diode elements disposed in the outer frame;

a hood to be mounted circumferentially around the outer frame of the main body; and

mounting means comprising spaced interengageable detent means including a plurality of circumferentially spaced projections and recesses provided in the main body and in the hood and resilient means for urging the detent means into engagement so that the hood may be circumferentially positioned and releasably locked on the outer frame of the main body at any of a plurality of circumferentially spaced positions determined by the detent means to shield the light emitting diode elements from ambient light incident in a selected circumferential direction.

7. The display panel of claim 6, wherein the display panel comprising a plurality of sets of the light-emitting diode indicators arranged two-dimensionally, each set comprising three light-emitting diode indicators that emits three primary color light beams, respectively.