There will be provided an image display, pixel TFTs and driving circuit of which are constituted by channel type TFTs of either n-channel or p-channel, capable of poly-gradation display. In an image display according to the present invention, there is provided switching means selecting means (shift register) for selectively inputting a driving signal inputted into the switch driving line into a plurality of switching means (switch matrix); the pixels (display electrodes), signal lines, switching means, decoding means (decoder) and the switching means selecting means are formed on the same substrate; and the transistors constituting the pixels, the switching means, the decoding means and the switching means selecting means are constituted by only channel type transistors of either n-channel or p-channel. The driving circuit can be integrally formed on the substrate together with the pixel transistors.
1. An image display, comprising: an image display unit constituted by a plurality of pixels; a plurality of signal lines arranged within said image display unit in order to input a display signal to said pixel; a gradation voltage line group to which gradation voltage that is an analog value is applied; switching means provided for each of said signal lines in order to selectively connect any of gradation voltage lines to which predetermined gradation voltage is applied from said gradation voltage line group to said signal line; a switch driving line for driving said switching means; decoding means for driving said switch driving line based on display signal data inputted in digital form; and switching means selecting means for selectively inputting a driving signal inputted to said switch driving line to a plurality of said switching means, wherein said pixel, said signal line, said switching means, said decoding means, and said switching means selecting means are formed on the same substrate, and wherein said pixel, said switching means, said decoding means and said switching means selecting means are constituted by only a single channel transistor of either n-channel or p-channel.
2. The image display according to claim 1 , wherein said decoding means is driven through the use of a four-phase clock.
3. The image display according to claim 1 , wherein for a transistor of a circuit to be formed on said substrate, there is used a polycrystal thin film transistor.
4. The image display according to claim 1 , wherein said switching means selecting means is formed through the use of a shift register circuit.
5. The image display according to claim 1 , wherein a trigger line for transmitting a selection signal from said switching means selecting means to said switching means and output wiring for transmitting output voltage of said switching means to said signal line are formed to intersect said gradation voltage line group.
6. An image display, comprising: an image display unit constituted by a plurality of pixels; a plurality of signal lines arranged within said image display unit in order to input a display signal to said pixel; a gradation voltage line group to which gradation voltage that is an analog value is applied; switching means provided for each of said signal lines in order to selectively connect any of gradation voltage lines to which predetermined gradation voltage is applied from said gradation voltage line group to said signal line; a switch driving line for driving said switching means; decoding means for driving said switch driving line based on display signal data inputted in digital form; and switching means selecting means for selectively inputting a driving signal inputted to said switch driving line to a plurality of said switching means, wherein said pixel, said signal line, said switching means, said decoding means, and said switching means selecting means are formed on the same substrate, wherein said pixel, said switching means, said decoding means and said switching means selecting means are constituted by only a single channel transistor of either n-channel or p-channel; and wherein said switching means is composed of: at least one first thin film transistor for connecting between said signal line and said gradation voltage line; and at least one second thin film transistor for selecting said switch through a selection signal of said switching means selecting means.
7. The image display according to claim 6 , comprising at least one capacitor for retaining voltage of said switch driving line.
8. An image display, comprising: an image display unit constituted by a plurality of pixels; a plurality of signal lines arranged within said image display unit in order to input a display signal to said pixel; a gradation voltage line group to which gradation voltage that is an analog value is applied; switching means provided for each of said signal lines in order to selectively connect any of gradation voltage lines to which predetermined gradation voltage is applied from said gradation voltage line group to said signal line; a switch driving line for driving said switching means; decoding means for driving said switch driving line based on display signal data inputted in digital form; and switching means selecting means for selectively inputting a driving signal inputted to said switch driving line to a plurality of said switching means, wherein said pixel, said signal line, said switching means, said decoding means, and said switching means selecting means are formed on the same substrate; wherein said pixel, said switching means, said decoding means and said switching means selecting means are constituted by only a single channel transistor of either n-channel or p-channel; and wherein said switching means is arranged at each intersection of said switch driving line and said trigger line; said first thin film transistor connects any of said gradation voltage line groups to any of output wiring; and said second thin film transistor is connected to any of said trigger lines and any of said switch driving lines.
9. The image display according to claim 1 , wherein at an output portion of a circuit constituting said decoding means, there is provided a boot-strap-circuit.
10. The image display according to claim 1 , wherein said decoding means is arranged in the peripheral portion of said switching means; said switching means selecting means is arranged in the peripheral portion of said image display unit; and said decoding means is arranged on a side different from said switching means and said switching means selecting means.
11. The image display according to claim 1 , wherein said image display unit is a liquid crystal display, and said transistors are all n-channel thin film transistors.
12. The image display according to claim 1 , wherein said image display unit is a light emitting diode display, and said transistors are all p-channel thin film transistors.