Liquid crystal display device
View Patent ↗The present invention realizes proper driving circuits in a driving-circuit integral type liquid crystal display device which has an increased screen size. The liquid crystal display device includes a liquid crystal display panel and a driving circuit which supplies video signals to video signal lines formed on the liquid crystal display panel. The driving circuit is comprised of a first driving circuit which is formed in a step similar to a step for forming pixels provided to the liquid crystal display panel and a second driving circuit which is connected to the liquid crystal display panel after formation of the liquid crystal display panel. The first driving circuit is constituted of a switching circuit which is capable of distributing an output of the second driving circuit to a plurality of video signal lines.
1. A liquid crystal display device comprising:
a liquid crystal display panel; and
a plurality of driving circuits which drive the liquid crystal display panel, the driving circuits comprising,
a first driving circuit forming in a step similar to a step for forming transistors of pixel regions provided to the liquid crystal display panel,
a second driving circuit which is connected to the liquid crystal display panel after formation of the liquid crystal display panel and electrically connected with the first driving circuit in series, and
a third driving circuit provided on the liquid crystal display panel and supplying a scanning voltage in each horizontal scanning period,
wherein the second driving circuit is capable of supplying three different color gray scale voltage signals from one output thereof in each horizontal scanning period, to the first driving circuit, and the first driving circuit supplies one of the three different color signals to one of three pieces of video signal lines of the liquid crystal display panel changing a connection between the output and the three pieces of video signal lines.
2. A liquid crystal display device comprising:
a liquid crystal display panel;
a second driving circuit formed along a first edge of the liquid crystal display panel and connected to the liquid crystal display panel through a flexible board;
a control signal line formed in a step similar to a step of forming pixel regions provided to the liquid crystal display panel, the control signal line extending along the first edge; and
a plurality of first driving circuits connected with each other by the control signal line; and
a third driving circuit formed along a second edge of the liquid crystal display panel and supplying a scanning voltage in each horizontal scanning period,
wherein an output of each of the first driving circuits electrically connects with a corresponding video signal line extending to a direction intersecting with the first edge and an input of each the of the first driving circuits electrically connects with a corresponding output of the second driving circuit in series,
wherein the flexible board has a wiring electrically connected with the control signal line, and
wherein the second driving circuit outputs three different color gray scale voltage signals to the first driving circuits in each horizontal scanning period and a control signal to the control signal line, and
the first driving circuit supplies one of the three different color signals to one of three pieces of video signal lines of the liquid crystal display panel changing a connection between the output and the three pieces of video signal lines.
3. A liquid crystal display device comprising:
a liquid crystal display panel;
a plurality of driving circuits which drive the liquid crystal display panel including a first driving circuit, a second driving circuit, and a third driving circuit;
the first driving circuit and the second driving circuit supplying video signals to the liquid crystal display panel;
the first driving circuit being formed in a step similar to a step for forming transistors of pixel regions provided to the liquid crystal display panel;
the second driving circuit being connected to the liquid crystal display panel after formation of the liquid crystal display panel and electrically connected in series with the first driving circuit; and
the third driving circuit being formed above the liquid crystal display panel and supplying a scanning voltage in each horizontal scanning period,
wherein the second driving circuit is mounted on a flexible board, and control signals of the first driving circuit are supplied to the first driving circuit through wiring provided to the flexible board, and
wherein the second driving circuit outputs three different color gray scale voltage signals to the first driving circuit in each horizontal scanning period and a control signal to the control signal line, and
the first driving circuit supplies one of the three different color signals to one of three pieces of video signal lines of the liquid crystal display panel changing a connection between the output and the three pieces of video signal lines.
4. A liquid crystal display device comprising:
a liquid crystal display panel; and
a plurality of driving circuits which drive the liquid crystal display panel, wherein the plurality of driving circuits include:
a first driving circuit which is formed in a step similar to a step for forming transistors of pixel regions provided to the liquid crystal display panel;
a second driving circuit which is connected to the liquid crystal display panel after formation of the liquid crystal display panel and electrically connected in series with the first driving circuit; and
a third driving circuit formed above the liquid crystal display panel and supplying a scanning voltage in each horizontal scanning period,
wherein the second driving circuit is configured such that the second driving circuit is capable of supplying three different color gray scale voltage signals to three pieces of video signal lines of the liquid crystal display panel in each horizontal scanning period, and
wherein the gray scale voltage signals of same polarity are supplied every n pieces of video signal lines, and
the first driving circuit supplies one of the three different color signals to one of three pieces of video signal lines of the liquid crystal display panel changing a connection between the output and the three pieces of video signal lines.