Display device having misalignment detection pattern for detecting misalignment between conductive layer and insulating layer

Abstract

There is provided a display device of high display quality having a circuit substrate, on which electronic parts are correctly mounted in a manner to afford visually recognizing presence and absence of misalignment of a solder resist opening with ease. The display device comprises a display panel and a circuit substrate connected to the display panel, the circuit substrate comprises an insulating substrate, a conductive layer, an insulating layer to cover a part of the conductive layer, a plating layer applied to that portion of the conductive layer, which is exposed from the insulating layer, and a misalignment detection pattern for detection of misalignment between the conductive layer and the insulating layer, and the misalignment detection pattern comprises a pattern covered by the insulating layer in a manner to prevent adherence of a plating material to the conductive layer.

1 . A display device comprising a display panel and a circuit substrate connected to the display panel,
 wherein the display panel includes an array substrate,   the circuit substrate is separately formed and positioned different from the array substrate and comprises an insulating substrate, a conductive layer, and an insulating layer to cover a part of the conductive layer,   the conductive layer of the circuit substrate includes a wiring pattern, wiring terminals, and a meshy pattern,   the wiring terminals are exposed from the insulating layer and are applied with a plating layer to a surface exposed from the insulating layer,   a misalignment detection pattern for detecting the misalignment between the conductive layer and the insulating layer is formed on the circuit substrate,   the misalignment detection pattern includes a first layer formed of the conductive layer, a second layer formed of the insulating layer having an opening,   the first layer is connected with the meshy pattern and is supplied with a predetermined potential,   if the misalignment between the conductive layer and the insulating layer is smaller than a predetermined misalignment tolerance, the first layer is wholly covered by the second layer in a manner to prevent adherence of a plating material to the first layer, and   if the misalignment between the conductive layer and the insulating layer is larger than the predetermined misalignment tolerance, a part of the first layer is exposed from the second layer at the opening in a manner to be applied with plating.   
   
   
       2 . The display device according to  claim 1 , wherein the opening of the second layer is surrounded by the first layer. 
   
   
       3 . The display device according to  claim 2 , wherein the first layer is formed in a frame shape. 
   
   
       4 . The display device according to  claim 1 , wherein the first layer is formed in a frame shape. 
   
   
       5 . The display device according to  claim 1 , wherein the first layer and meshy pattern are supplied with a ground potential. 
   
   
       6 . The display device according to  claim 1 , wherein the circuit substrate is a flexible printed circuit substrate. 
   
   
       7 . The display device according to  claim 1 , wherein an electronic part is mounted on one of the wiring terminals of the circuit substrate. 
   
   
       8 . The display device according to  claim 1 , wherein the circuit substrate covers a part of a back surface of the display panel. 
   
   
       9 . The display device according to  claim 1 , wherein the circuit substrate covers a part of a side surface of the display panel. 
   
   
       10 . The display device according to  claim 1 , wherein the display panel is a liquid crystal display panel having a backlight, and the circuit substrate covers a part of a back surface of the backlight. 
   
   
       11 . The display device according to  claim 10 , wherein a drive circuit chip is mounted on the array substrate of the liquid crystal display panel, and the circuit substrate is connected at one end thereof to the drive circuit chip and at the other end thereof to another substrate provided on the back surface of the backlight. 
   
   
       12 . The display device according to  claim 1 , wherein the display panel is a liquid crystal display panel, an organic electroluminescence (EL) display panel, a field emission type display (FED) panel, or a plasma display panel.