Fine shadow mask assembly for an active matrix organic light emitting diode (AMOLED) and fine shadow mask assembly manufacturing method

Abstract

An active matrix organic light emitting diode shadow mask assembly includes a shadow mask frame, longitudinal supporting bars, transverse spacer plates, shadow mask plates. The longitudinal supporting bars are disposed on the shadow mask frame at intervals. The transverse spacer plates are disposed on circular rod portions of the longitudinal supporting bars, are supported by the longitudinal supporting bars, are arranged at intervals. The shadow mask plates are disposed on the transverse spacer plates, are supported by the longitudinal supporting bars, parallel the transverse spacer plates. Each transverse spacer plate is located under a gap between adjacent shadow mask plates, contacts the shadow mask plates, covers the gap. The transverse spacer plates directly contacting the shadow mask plates effectively cover the gaps between the shadow mask plates, effectively prevent organic material in a later process from leaking through the shadow mask plates, dropping on to a lower glass substrate.

Claims

1. A fine shadow mask assembly for an active matrix organic light emitting diode (AMOLED), comprising: a shadow mask frame; a plurality of longitudinal supporting bars disposed on the shadow mask frame and arrange at intervals, each of the longitudinal supporting bars comprising a circular rod portion and two flat portions, and the two flat portions formed on two ends of the circular rod portion respectively, disposed on a top edge of the shadow mask frame, and located at two opposite sides of the shadow mask frame respectively; a plurality of transverse spacer plates disposed on the circular rod portions of the longitudinal supporting bars, supported by the longitudinal supporting bars, intersecting the longitudinal supporting bars, and arranged at intervals; and a plurality of shadow mask plates disposed on the transverse spacer plates, supported by the longitudinal supporting bars, and paralleling the transverse spacer plates, wherein each of the transverse spacer plates is located under a gap between adjacent two of the shadow mask plates, contacts the adjacent two of the shadow mask plates, and covers the gap; wherein pairs of fixing notches are defined in the shadow mask frame, the pairs of the fixing notches correspond to the longitudinal supporting bars, the two fixing notches of each pair are defined in the top edge of the shadow mask frame, are located on the two opposite sides of the shadow mask frame respectively, and fix and receive the two flat portions of a corresponding one of the longitudinal supporting bars; wherein a diameter of the circular rod portion of each of the longitudinal supporting bars is 0.6 mm, a thickness of the flat portions is 0.3 mm, and a depth of each of the fixing notches is 0.45 mm.

2. The fine shadow mask assembly for the AMOLED as claimed in claim 1, wherein a top edge of the circular rod portion of each of the longitudinal supporting bars is flush with the top edge of the shadow mask frame.

3. The fine shadow mask assembly for the AMOLED as claimed in claim 1, wherein a diameter of the circular rod portion of each of the longitudinal supporting bars is greater than a thickness of the flat portion.

4. The fine shadow mask assembly for the AMOLED as claimed in claim 1, wherein a diameter of the circular rod portion of each of the longitudinal supporting bars is less than a width of the flat portion.

5. The fine shadow mask assembly for the AMOLED as claimed in claim 1, wherein each of the flat portions of each of the longitudinal supporting bars comprises two soldering sides.

6. The fine shadow mask assembly for the AMOLED as claimed in claim 1, wherein each of the flat portions of each of the longitudinal supporting bars comprises a truncated distal end.

Description

DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a top view of a conventional fine shadow mask assembly for an active matrix organic light emitting diode (AMOLED);

(2) FIG. 2 is a partially enlarged cross sectional side view of the conventional fine shadow mask assembly for the AMOLED according to line A-A in FIG. 1;

(3) FIG. 3 is a top view of a fine shadow mask assembly for an AMOLED of the present invention;

(4) FIG. 4 is another top view of the fine shadow mask assembly for the AMOLED of the present invention, wherein one of the shadow mask plates is removed;

(5) FIG. 5 is a perspective view of longitudinal supporting bars of the fine shadow mask assembly for the AMOLED of the present invention;

(6) FIG. 6 is a cross sectional side view of the fine shadow mask assembly for the AMOLED of the present invention according to line B-B in FIG. 3;

(7) FIG. 7 is a partially enlarged cross sectional side view of the fine shadow mask assembly for the AMOLED of the present invention in FIG. 6;

(8) FIG. 8 is an end view of the fine shadow mask assembly for the AMOLED of the present invention;

(9) FIG. 9 is a partially enlarged top view of the fine shadow mask assembly for the AMOLED of the present invention according to a circle area C in FIG. 4;

(10) FIG. 10 is a partially enlarged end view of the fine shadow mask assembly for the AMOLED of the present invention according to a circle area D in FIG. 8; and

(11) FIG. 11 is a flowchart of a fine shadow mask assembly manufacturing method for an AMOLED of the present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

(12) With reference to FIGS. 3, 4 and 6, an active matrix organic light emitting diode (AMOLED) fine shadow mask assembly of the present invention comprises a shadow mask frame 10, a plurality of longitudinal supporting bars 20, a plurality of transverse spacer plates 30, and a plurality of shadow mask plates 40.

(13) With reference to FIGS. 8 to 10, the shadow mask frame 10 is substantially regular. Pairs of fixing notches 110 are defined in the shadow mask frame 10. The two fixing notches 110 of each pair are defined in a top edge 13 of the shadow mask frame 10, and are located two opposite sides 11 of the shadow mask frame 10.

(14) With reference to FIG. 5, the longitudinal supporting bars 20 are disposed on the shadow mask frame 10 and are arranged at intervals. Each of the longitudinal supporting bars 20 comprises a circular rod portion 21 and two flat portions 23.

(15) With reference to FIGS. 7 and 9, the two flat portions 23 are formed on two ends of the circular rod portion 21 respectively, are disposed on the top edge 13 of the shadow mask frame 10, and are located on the two opposite sides 11 of the shadow mask frame 10. A diameter of the circular rod portion 21 of each of the longitudinal supporting bars 20 is greater than a thickness of the flat portion 23, as shown in FIG. 7. The diameter of the circular rod portion 21 of each of the longitudinal supporting bars 20 is less than a width of the flat portion 23, as shown in FIG. 9. The pairs of the fixing notches 110 correspond to the longitudinal supporting bars 20, and the fixing notches 110 of each pair fix and receive the two flat portions 23 of a corresponding one of the longitudinal supporting bars 20. Furthermore, a top edge of the circular rod portion 21 of each of the longitudinal supporting bars 20 is flush with the top edge 13 of the shadow mask frame 10 such that the shadow mask frame 10 and the longitudinal supporting bars 20 can cooperate with each other to form a flat supporting top surface to flatly support the transverse spacer plates 30 and the shadow mask plates 40.

(16) In a preferred embodiment, each of the flat portions 23 of each of the longitudinal supporting bars 20 comprises two soldering sides 231 and a truncated distal end 233. The two soldering sides 231 can be attached with soldering material such as tin solder. The truncated distal end 233 can be flush with one side 11 of the shadow mask frame 10.

(17) In a preferred embodiment, the diameter of the circular rod portion 21 of each of the longitudinal supporting bars 20 is 0.6 mm, the thickness of the flat portion 23 is 0.3 mm, and a depth of each of the fixing notches 110 is 0.45 mm.

(18) The transverse spacer plates 30 are disposed on the circular rod portions 21 of the longitudinal supporting bars 20, are supported by the longitudinal supporting bars 20, intersect the longitudinal supporting bars 20, and are arranged at intervals\.

(19) The shadow mask plates 40 are disposed on the transverse spacer plates 30, are indirectly supported by the longitudinal supporting bars 20, and parallel the transverse spacer plates 30. Each of the transverse spacer plates 30 is located under a gap 45 of adjacent two of the shadow mask plates 40, contact the adjacent two shadow mask plates 40, and covers the gap 45, as shown in FIG. 7.

(20) With reference to FIG. 11, another objective of the present invention is to provide a fine shadow mask assembly manufacturing method for an AMOLED comprising: a shadow mask frame providing step S01, a longitudinal supporting bar disposing step S02, a longitudinal supporting bar tensioning step S03, a transverse spacer plates disposing step S04, a transverse spacer plate tensioning step S05, a shadow mask plate disposing step S06, and a shadow mask plate tensioning step S07.

(21) The shadow mask frame providing step S01 comprises providing a shadow mask frame 10.

(22) The longitudinal supporting bar disposing step S02 comprises disposing a plurality of longitudinal supporting bars 20 on the shadow mask frame 10. Each of the longitudinal supporting bars 20 comprises a circular rod portions 21 and two flat portions 23. The two flat portions 23 are formed on two ends of the circular rod portions 21 respectively and are disposed on a top edge of the shadow mask frame 10.

(23) The longitudinal supporting bar tensioning step S03 comprises tensioning the longitudinal supporting bars 20.

(24) The transverse spacer plates disposing step S04 comprises disposing a plurality of transverse spacer plates 30 on the circular rod portions 21 of the longitudinal supporting bars 20. The transverse spacer plates 30 intersect the longitudinal supporting bars 20.

(25) The transverse spacer plate tensioning step S05 comprises tensioning the transverse spacer plates 30.

(26) The shadow mask plate disposing step S06 comprises disposing a plurality of shadow mask plates 40 on the transverse spacer plates 30 such that each of the transverse spacer plates 30 is located under a gap 45 between adjacent two of the shadow mask plates 40, contacts the adjacent two shadow mask plates 40, and covers the gap 45.

(27) The shadow mask plate tensioning step S07 comprises tensioning the shadow mask plates 40.

(28) Compared to the prior art, the fine shadow mask assembly for the AMOLED of the present invention has the following advantages.

(29) 1. Each of the longitudinal supporting bars 20 provides excellent supporting capability through the circular rod portion 21 with the greater diameter such that the longitudinal supporting bars 20 can stably support the shadow mask plates 40 without deformation. Therefore, flatness of the shadow mask plates 40 on the shadow mask frame 10 is maintained.

(30) 2. Each of the transverse spacer plates 30 directly contacts corresponding adjacent two of the shadow mask plates 40, closes the gap 45 between the adjacent two shadow mask plates 40, and effectively prevents organic material in a later vapor deposition process from inadvertently passing through the gap 45 between the adjacent shadow mask plates 40 and falling onto a glass substrate of the AMOLED display panel, which improves yield of the later process.

(31) 3. The transverse spacer plates 30 are disposed on the longitudinal supporting bars 20, are supported by the longitudinal supporting bars 20 without deformation.

(32) 4. Each of the shadow mask plates 40 contacts circular rod portions 21 of the longitudinal supporting bars 20 in lines instead of surface contact as in the prior art, and therefore effectively reduce friction between the shadow mask plates 40 and the longitudinal supporting bars 20, which facilitates fine adjustment to tension of the longitudinal supporting bars 20, the transverse spacer plates 30 and the shadow mask plates 40.

(33) 5. In the above fine shadow mask assembly manufacturing method for the AMOLED, because the longitudinal supporting bars 20, the transverse spacer plates 30 and the shadow mask plates 40 are sequentially tensioned, it is ensured that the longitudinal supporting bars 20 can support the transverse spacer plates 30 and the shadow mask plates 40 to prevent the transverse spacer plates 30 and the shadow mask plates 40 from drooping and deforming.