hereinafter , the present invention will now be described through preferred embodiments . the embodiments do not limit the invention according to claims and all combinations of the features described in the embodiments are not necessarily essential to means for solving the problems of the invention . fig1 is a perspective view showing a microdisplay 11 according to a first embodiment attached to the spectacles 500 . fig2 is an enlarged view showing a portion at which the display body 40 is connected to the horizontal extending section 70 in the microdisplay 11 . the components with the same reference numerals shown in fig1 and 2 have the same configuration as the components of the microdisplay 10 shown in fig6 and 7 , so that the description thereof is omitted . in the microdisplay 11 , the fixture 152 is attached to the outside of a main body 44 . an edge 154 of the fixture 152 is located on approximately the center of the upper surface of the main body 44 in the horizontal direction , and protrudes thereover . the edge 154 having a horizontal through - hole , as shown in fig1 and 2 , is connected to one end of the vertical extending section 100 and is fixed with a screw 158 and a nut 159 . the vertical extending section 100 , as shown in fig1 and 2 , is attached to the edge 154 of the fixture 152 on approximately the center of the display body 40 in the horizontal direction , and extended to the vertical direction . the vertical extending section 100 also has a ball 112 on the other end thereon , which is opposite to the end attached to the edge 154 . the ball 112 is rotatably fitted into a support 114 formed on the front edge of an arm 166 extending from a sliding member 164 to form a ball joint . these ball 112 and support 114 are examples of the embodiment of the joint of the present invention . the sliding member 164 has the same shape of the sliding member 64 of the mocrodisplay 10 described above , includes the through - hole through which the horizontal extending section 70 is penetrated and is slidably held by the horizontal extending section 70 . in the microdisplay 11 , the display body 40 is connected to the horizontal extending section 70 via the vertical extending section 100 which is attached to substantially the center of the display body 40 in the horizontal direction and extended to the vertical direction . therefore , it can not relatively disturb the user &# 39 ; s view in comparison with the case that the vertical extending section 100 is placed on the side of the display body 40 while the microdisplay 11 is attached to the lens 531 of the spectacles as shown in fig1 , for example . additionally , in the above described state , the display body 40 can rotate vertically and along the surface of the ball 112 in a plane vertical to the lens 531 , in a plane parallel to the lens 531 and in a level plane . further , as shown in fig2 , a groove 116 is formed in the support 114 . thereby the display body 40 can be moved vertically in the plane vertical to the lens 531 to a position outside of the user &# 39 ; s view without removing the microdisplay 11 from the spectacles 500 . fig3 is a perspective view showing the microdisplay 12 according to a second embodiment of the present invention attached to the spectacle 500 . fig4 is an enlarged view showing a portion at which the display body 40 is connected to the horizontal extending section 70 in the microdisplay 12 . the components with the same reference numerals shown in fig3 and 4 have the same configuration as the components of the microdisplay 10 shown in fig6 and 7 , so that the description thereof is omitted . the following further describes another configuration of the microdisplay 12 , which is attached to the lens 531 of the spectacles 500 as shown in fig3 . in the microdisplay 12 , a fixture 252 is attached to the outside of a main body 44 . the edge 254 of the fixture 252 is located on approximately the center of the upper surface of the main body 44 in the horizontal direction , and protrudes thereover . additionally , the edge 254 has a screw section 256 through which a threaded hole penetrating in the horizontal direction is formed , is connected to one end of a first support member 200 and is fixed with a screw 258 and a nut 259 as shown in fig3 and 4 . the first support member 200 , as shown in fig3 and 4 , is attached to the edge 254 of the fixture 252 approximately on the horizontal center of the display body 40 , and extended to the vertical direction . the second support member 210 is connected to the sliding member 264 via an arm 266 . a second support member 210 has a through - hole 212 whose openings are in the both top and bottom surfaces , which have almost the same cross sectional area as that of the first support member 200 . as shown in fig3 and 4 , the first support member 200 penetrates through the through - hole 212 and is slidably held by the second support member 210 in the vertical direction . the sliding member 264 has the same shape of the sliding member 64 of the mocrodisplay 10 and the sliding member 164 of the mocrodisplay 11 described above , includes the through - hole through which the horizontal extending section 70 is penetrated and is slidably held by the horizontal extending section 70 . fig5 is a cross - sectional view showing the inner structure of the second support member 210 . as shown in fig5 , the first support member 200 penetrates through the center of an outer shell 211 of the second support member 210 in the vertical direction . then , a fixing section 220 including an abutting member 222 and a leaf spring 223 is placed in the inner side of the outer shell 211 of the second support member 210 . one end of the leaf spring 223 is abutted with the one surface of the abutting member 222 and applies bias power to the abutting member 222 in such direction that the abutting member 222 abuts with the first support member 200 . therefore , while the side surface of the first support member 200 is abutted with the abutting member 222 , the first support member 200 is fixed to the second support member 210 so as not to move in the vertical direction . meanwhile , as shown in fig5 , a hook 224 is provided on a surface abutting with the leaf spring 223 on the abutting member 222 . the second support member 210 has a lever 227 protruding outwardly from the opening 225 on the outer shell 211 , and a rotating shaft 226 vertically put over the opening 225 . both vertical ends of the rotating shaft 226 are fixed to the outer shell 211 . the lever 227 rotates around the rotating shaft 226 . additionally , a hook 228 is formed opposed to the rotating shaft 228 of the lever 227 , i . e . in the inner side of the outer shell 211 of the second support member 210 of the lever 227 . here , when the lever 227 is moved to the direction indicated by the arrow “ a ” shown in fig5 , the hook 228 hitches the hook 224 of the abutting member 222 to move the abutting member 222 to the direction indicated by the arrow “ b ” shown in fig5 . thereby the abutting member 222 removes from the side surface of the first support member 200 , so that the first support member 200 can freely move with respect to the second support member 210 in the vertical direction . meanwhile , when the lever 227 moved in the direction indicated by the arrow “ a ” shown in fig5 is released , the lever 227 is immediately returned to the position shown in fig5 , and the abutting member 222 is abutted with the side surface of the first support member 200 . therefore , the first support member 200 is fixed to the second support member 210 so as not to move in the vertical direction . for example , if the user wearing the spectacles 500 with the microdisplay 12 wants to move the display body 40 in the vertical direction , the user can move the display body 40 supported by the first support member 200 to a desired position in the vertical direction by operating the above lever 227 . therefore , the display body 40 can be moved to the desired position in the vertical direction without removing the microdisplay 12 from the spectacles 500 . in addition , the first support member 200 has a stopper 202 on one end which is opposite to the other end attached to the edge 254 . therefore , if the user fails to operate the lever 227 and then the second support member 210 is moved up to the upper end of the first support member 200 , the second support member 210 is abutted with the stopper 202 and stopped , so that the display body 40 cannot fall out by dropping out the second support member 210 from the first support member . while the present invention has been described with the embodiment , the technical scope of the invention not limited to the above described embodiment . it is apparent to persons skilled in the art that various alternations and improvements can be added to the above - described embodiment . it is apparent to persons skilled in the art that various alternations and improvements can be added to the above - described embodiment .