Display apparatus

#The present invention relates to an active-matrix-type display apparatus which uses light-emission elements, such as EL (electroluminescence) elements that emit light when driving current flows through an organic semiconductor film or LED (light-emitting diode) elements, and thin-film transistors (hereinafter referred to as “TFTs”) that control the light-emission operation of this light-emission element. More particularly, the present invention relates to layout optimization technology for improving the display characteristics thereof.

#Active-matrix-type display apparatuses which use current-control-type light-emission elements, such as EL elements or LED elements, have been proposed. Since any of the light-emission elements used in this type of display apparatus may emit light by itself, unlike a liquid-crystal display device, a backlight is not required, and there are advantages in that viewing angle dependence is small.

#FIG. 22 shows, as an example of such a display apparatus, a block diagram of an active-matrix-type display apparatus which uses charge-injection-type organic thin-film EL elements. In a display apparatus 1A shown in this figure, formed on a transparent substrate are a plurality of scanning lines “gate”, a plurality of data lines “sig” extending in a direction intersecting the extension direction of these scanning lines “gate”, a plurality of common power-feed lines “com” which are parallel to these data lines “sig”, and pixels 7 corresponding to the intersections of the data lines “sig” and the scanning lines “gate”. With respect to the data lines “sig”, a data-side driving circuit 3 comprising a shift register, a level shifter, video in, and an analog switch is formed. With respect to the scanning lines, a scanning-side driving circuit 4 comprising a shift register and a level shifter is formed. Further, each of the pixels 7 is formed with a first TFT 20 in which a scanning signal is supplied to its gate electrode via the scanning lines, a holding capacitor “cap” for holding an image signal supplied from the data lines “sig” via this first TFT 20, a second TFT 30 in which an image signal held by this holding capacitor “cap” is supplied to its gate electrode, and light-emission elements 40 to which driving current flows from the common power-feed lines “com” when these are electrically connected to the common power-feed lines “com” via the second TFT 30.

#FIG. 1 is an illustration schematically showing a display apparatus of the present invention, and the formation area of a bank layer formed therein.

#FIG. 2 is a block diagram showing the basic construction of the display apparatus of the present invention.

#FIG. 3 is a plan view in which pixels of the display apparatus according to the first embodiment of the present invention are enlarged.

#1 display apparatus 2 display section 3 data-side driving circuit 4 scanning-side driving circuit 5 checking circuit 6 pad for mounting 7, 7A, 7B pixels 10 transparent substrate 11 first TFT 21 gate electrode of first TFT 30 second TFT 31 gate electrode of second TFT 40, 40A, 40B light-emission elements 41 pixel electrode 42 positive-hole injection layer 43 organic semiconductor film 45 thin lithium-containing aluminum electrode 46 ITO film layer 50 gate insulation film 51 first interlayer insulation film 52 second interlayer insulation film DA dummy wiring layer bank bank layer cap holding capacitor line capacitance line com common power-feed line gate, gateA, gateB scanning lines op, opA, opB counter electrodes sig, sigA, sigB data lines st, stA, stB potential holding electrodes

#The embodiments of the present invention will be described below with reference to the drawings.

#(Overall Construction of Active-matrix Substrate)