Abstract:
A display device is assembled so that access to the main PCB assembly is simplified. The rear housing covers the assembly; and once removed only the top shield has to be removed to expose the top of the main PCB assembly. After the top is removed the stand and bottom bracket can be easily removed, to gain access to the bottom of the main PCB assembly. This display device allows for the testing, repairing, and replacing of individual components of the main PCB without having to remove any of the side PCB assemblies. This allows repairs to be made in less time, at a lower cost, and increases the market competitiveness of the display device.

Description:
CLAIM OF PRIORITY 
     This application makes reference to, incorporates the same herein, and claims all rights accruing thereto under 35 U.S.C. §119 through my patent application entitled Display Apparatus earlier filed in the Korean Industrial Property Office on Nov. 21, 1996 and there duly assigned Ser. No. 1996/56175. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to a display device and, more specifically, to a display device that simplifies the repair or the replacement of individual components of the main printed circuit board. 
     2. Background Art 
     A display device is generally constructed using a stand, a front housing, and a rear housing. The housings contain a cathode ray tube (CRT) and a printed circuit board (PCB). The increasing performance demands for display devices, resulting from widespread use of multi-media applications, has led to the development of various techniques to increase the overall quality of display devices. One method of enhancing monitor performance has been to supplement the main printed circuit board with additional side mounted printed circuit boards. This has resulted in display devices becoming bulkier and heavier while the internal components of the display devices have become even more intricate. Research targeted at improving the assembly and design of monitors is shown, by way of example, in: U.S. Pat. No. 4,459,640 to Latasiewicz entitled Display Mounting Assembly, U.S. Pat. No. 4,245,274 to Mac Donald entitled Readout and Circuit Board with Test Access, U.S. Pat. No. 5, 122,928 to Lo entitled Monitor Housing, U.S. Pat. No. 5,575,545 to Wang entitled Monitor Shell, U.S. Pat. No. 5,419,629, to Korinsky entitled Electronics Chassis and Method of Manufacture Therefor, U.S. Pat. No. 5,045,974 to Ohkoshi entitled Display Tube Assembly and Mounting Process Thereof and U.S. Pat. No. 5,515,240 to Rodeffer entitled Self-Locking Housing Including Tabs that Bear Against the Sides of the Printed Circuit Board. 
     I have observed that the trend of increasing the size of display devices while using the intricate components necessary to increase performance has increased the difficulty of making repairs. The increasing difficulty is largely due to the increasing effort and care necessary to disassemble a monitor. This is especially true when the main printed circuit board must be tested or repaired. The main printed circuit board is typically located in the bottommost interior portion of the display device. Thus, to access the main PCB, one has to remove the rear housing, the side-mounted PCB assemblies, and the shields or guards that are also built into some display devices, and the multi-bracketed frame or stand assembly must be disassembled prior to removing the main PCB. Only after removing the main PCB can the board be turned over and the bottom soldered to repair and replace individual circuit components. I expect that a display device that simplified access to the main PCB would reduce the time necessary to make repairs, lower the cost of repairs, and increase the market competitiveness of the display devices. 
     SUMMARY OF THE INVENTION 
     Accordingly, it is an object of the present invention to provide an improved display device. 
     It is another object to provide a display device that requires less disassembly to access the main PCB. 
     It is still another object to provide a display device that reduces the cost of making repairs. 
     It is still another object to provide a display device that requires less time to make repairs or exchange individual components. 
     It is yet another object to provide a display device that has increased market competitiveness. 
     To achieve these and other objects, a display device may be constructed with a front housing that covers the front of a cathode-ray tube. A main PCB assembly is installed beneath the cathode-ray tube. The main PCB is supported by a PCB bracket that has a plurality of holes and is attached to a lower frame. The lower frame secures the front housing to the PCB bracket and the bottom bracket. A stand and stand base supports the display device and attaches to bottom bracket. Then, a rear housing is slidably engaged over the main PCB, the PCB bracket, the bottom bracket, and any side PCB assemblies. The type of connections used makes it very easy to remove both the stand and the bottom bracket to access the bottom of the main PCB assembly and, by removing the rear housing, one can access the top of the main PCB assembly. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     A more complete appreciation of this invention, and many of the attendant advantages thereof, will be readily apparent as the same becomes better understood by reference to the following detailed description when considered in conjunction with the accompanying drawings in which like reference symbols indicate the same or similar components, wherein: 
     FIG. 1 is an exploded perspective view of a display device as constructed according to the principles of the present invention; 
     FIG. 2 is an exploded perspective view of the salient features of the display device of FIG. 1; 
     FIG. 2A is a perspective view of the lower frame of the display device of FIG. 1; 
     FIG. 2B is a perspective view of the PCB bracket and the bottom bracket of the display device of FIG. 1; 
     FIG. 2c is a perspective view of the stand of the display device of FIG. 1; 
     FIGS. 3-8 are sequential, cross-sectional views illustrating the assembly of the display device of FIG. 1; 
     FIG. 3 is a cross-sectional view of the CRT, CRT frame, front housing, and lower frame of the display device of FIG. 1; 
     FIG. 4 is a cross-sectional view of the device of FIG. 3 with the PCB bracket attached; 
     FIG. 5 is a cross-sectional view of the device of FIG. 4 with the bottom bracket attached; 
     FIG. 6 is a cross-sectional view of the device of FIG. 5 with the stand and stand base attached; 
     FIG. 7 is a cross-sectional view of the device of FIG. 6 with the side assemblies and rear assembly attached; 
     FIG. 8 is a cross sectional view of the device of FIG. 7 with the rear housing and side shields attached; 
     FIG. 9 is an exploded side view of the display device of FIG. 1 in a partially disassembled state. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
     Turning now to the drawings, FIG. 1 illustrates a display device as constructed according to the principles of the present invention. Cathode-ray tube 11 and cathode-ray tube frame 13 are attached to front housing 10. Main PCB assembly 14 is supported by PCB bracket 30 and bottom bracket 40. Lower frame 20 secures both PCB bracket 30 and bottom bracket 40 to front housing 10. Side assembly 15a and side assembly 15b both attach to PCB bracket 30. The side assemblies may contain extra PCBs to enhance the display devices performance. Then side shields 16a and 16c are secured to opposing sides of both PCB bracket 30 and CRT frame 13. Rear shield 16b is attached to both side shields 16c and 16a, and top shield 17 is also attached. Stand 50 supports the display device with stand base 51 attached to the bottom bracket 40. Then rear housing 18 is attached over all the assemblies and fastened to both CRT 11 and front housing 10. 
     FIG. 2 shows the salient features of the improved display device, while FIGS. 2A or 2B are perspective views of the lower frame and PCB and bottom brackets, respectively, of FIG. 1. Lower frame 20 has two side brackets 22 that are attachable to the lower portion of front case 10 using fasteners 21. The fasteners can be any type of screw, rivet, bolt, or the like. Holes 23 allow latching protrusions 52 to interlock with lower frame 20 with stand base 51. The lower frame has a rear brace 24 that has latching projections 27, side coupling holes 25 and 25&#39;, and central coupling hole 26. 
     PCB bracket 30 has two side flanges 33 that couple with lower frame 20 using fasteners 28. The PCB 30 bracket has a front flange 34 that has side fastener receiving holes 32&#39;, central fastener receiving hole 32, and guide holes 35 into which latching projections 27 of lower frame 20 are inserted. PCB bracket 30 has a plurality of hook receiving holes 36 oppositely positioned on the sides of the PCB bracket 30 perpendicular to the lower fame&#39;s rear brace 24. The hook holes 36 are used to allow bottom bracket 30 40 to attach to the PCB bracket. Rear wall 37 of the PCB bracket 30 has fastener receiving hole 38 and rear hook receiving holes 39. A plurality of holes 31 exposing the bottom of the main PCB assembly 14 are located in the lower surface of PCB bracket 30. 
     Bottom bracket 40 has a front flange 41 that is fastened to PCB bracket 30. The front flange has central fastener receiving hole 42, side fastener receiving holes 42&#39;, and holes 49. Bottom bracket 40 is attached to lower frame 20 that attaches to PCB bracket 30 and the three components are held together by fastener 48. Rear wall 44 of bottom bracket 40 has a central flange 45 that is fastened to PCB bracket 30 using fastener 48&#39;. Rear hooks 46 are located on the rear wall of bottom bracket 40 and are inserted into hook receiving holes 39 in the PCB bracket. A plurality of protruding hooks 43 are located on the sides of bottom bracket 40 and can be inserted into hook receiving holes 36 of PCB bracket 30. Bottom bracket 40 also has a plurality of slots 47 formed in the lower surface that latching protrusions 53 of stand base 51 can use to interlock the bottom bracket 40 with the stand. The front flange 41 of bottom bracket 40 has assembling holes 49 that receive coupling guides 27 that have passed through guide holes 35. A main PCB assembly 14 is installed onto PCB bracket 30 before the connecting of front flange 34 to rear brace 24 of lower frame 20. 
     Stand 50 has two flanges 54 for interlocking the stand 50 with the lower frame via bottom bracket 40 using fasteners 60. Also included in the assembly of the display device are side shields 16a and 16c, rear shield 16b, and top shield 17 that protect side PCB assemblies 15a and 15b. An additional side-mounted PCB assembly (opposite 15a) is generally part of the display device, but has been omitted from the drawings. The assembly process for a display device constructed according to the principles of the present invention is shown in FIGS. 3 through 8. To start with, as shown in FIG. 3, lower frame 20 is connected to front housing 10. The side brackets 22 of lower frame 20 are secured to the front housing 10. By using the screws 21, the side brackets of the lower frame 20 are secured to the front case 10 using fasteners. The cathode-ray tube 11 and cathode-ray tube frame 13 are connected using fasteners also. 
     FIG. 4 illustrates the display device after the PCB bracket 30 is attached. The PCB bracket 30 is fixed to the rear of lower frame 20. Here, coupling guides 27 of lower frame 20 are inserted into guide holes 35 of PCB bracket 30. Thus, coupling holes are aligned as follows: 25&#39; with 32, 27 with 35, 26 with 32, and 25 with 33. 
     FIG. 5 illustrates the attaching of bottom bracket 40 to the PCB bracket 30. First, the bottom bracket 40 is attached to the bottom of PCB bracket 40 30. Then the bottom bracket is attached to lower frame 20. To attach the bottom bracket 40 to the PCB bracket, bottom bracket 40 is pushed upward against the PCB bracket 30 so that protruding hooks 43 are inserted through hook receiving holes 36. Then, the bottom bracket 40 is slid forward toward lower frame 20. This causes protruding hooks 43 of bottom bracket 40 to engage the PCB bracket 30. With the bottom bracket 30 securely held onto the PCB bracket 30 the two brackets are ready to be fastened together. Central coupling holes 26, 32 and 42 are now in alignment so that a fastener can further secure lower frame 20, PCB bracket 30, and bottom bracket 40 together. Bottom bracket and PCB 40 bracket can be further fastened by fastener 48&#39; inserted through aligned fastener receiving hole 38, located at the rear of PCB bracket 30, and central flange 45, located on bottom bracket 40. As an alternative to the above assembling process, bottom bracket 40 may be secured to PCB bracket 30 before attaching lower frame 20. 
     In FIG. 6, stand 50 is attached to bottom bracket 40. Here, latching protrusions 52 on stand base 51 are inserted into lower frame 20 and locking protrusions 53 of the stand base 51 are inserted into the slots 47 of bottom bracket 40. Then, stand base 51 is pushed forward and locked into position, thus aligning flanges 54 with side coupling holes 42&#39;, 32&#39; and 25&#39;, so that stand 50 may be fastened to the entire assembly using fasteners 60. These fasteners are inserted through bottom bracket 40, PCB bracket 30, and into lower frame 20. 
     FIG. 7 shows the display device further assembled with side PCB assemblies 15a and 15b, as well as the third-side PCB assembly (not shown), mounted to the periphery of PCB bracket 30. FIG. 8 shows the display device with top shield 17, side shields 16a and 16c, rear shield 16b, and rear housing 18 attached. The shields 16 a-16c and 17 are fastened into place and then the rear housing is attached over the entire assembly. 
     FIG. 9 shows a display device constructed according to the principles of the present invention partially disassembled to facilitate repairing the main PCB assembly. With rear housing 70 separated from the display device and laid aside, fasteners 60 may be removed to allow stand base 50 to be pulled rearward and separate the stand from the main assembly. In removing the stand, latching protrusions 52 are separated from holes 23 on lower frame 20 and latching protrusions 53 are removed from slots 47 on bottom bracket 40. Then, after fasteners 48 and 48&#39; are removed, bottom bracket 40 is pulled back and downward, thus unlocking hooks 43 and 46 from hook receiving holes 36 and 39 on PCB bracket 30. 
     Once the bottom bracket 40 is removed, holes 31 in PCB bracket 30 expose the bottom of the main PCB assembly to make the PCB assembly accessible for the testing or the repairing of individual circuit components. If top shield 17 is removed, then the top circuit components on main PCB assembly 14 can be also accessed. Thus, the testing and repairing of the main PCB assembly can be achieved in a more efficient manner than previously possible. This monitor does not require the separating of any side PCB assemblies from PCB bracket 30 to repair, test, and repair components. By reversing the above steps, reassembly of the monitor after the required maintenance is completed. 
     This improved monitor constructed according to the preferred embodiment simplifies maintenance, lowers costs, increases efficiency, and increases the market competitiveness of the display devices. Although this preferred embodiment of the present invention has been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. It is also possible that other benefits or uses of the currently disclosed invention will become apparent over time.