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US 8,786,580 B2Granted
Image display device and transmission signal control method to be used in same
AssigneeNLT Technologies, Ltd.
InventorKouichi Ooga
Life of this patent
Estimating the term…
Abstract
An image display device and a transmission signal control method to be used in same and more particularly to the image display device and the transmission signal control method that can be suitably used when transmission wirings for data signal based on a video signal become complicated due to configurations of a large-sized and high-definition image display device.
Claims9
An image display device comprising:
- a display panel including a plurality of display regions each having predetermined columns of data lines, predetermined rows of scanning lines, and a plurality of pixel each disposed at an intersection between each of said data lines and each of said scanning lines;
- a plurality of data line driving circuits each arranged on data line terminal side margins of said display panel to write pixel data, based on a transmitted data signal, to each of said data lines in a corresponding display region,
- a scanning line driving circuit to output a scanning driving signal for driving each scanning line in a predetermined order based on a given scanning control signal;
- and
- a signal processing unit, based on a given video signal, to generate a data signal and to transmit the generated data signal to a corresponding one of said data line driving circuits through a corresponding data signal transmission wiring and to generate said scanning control signal and to transmit the generated scanning control signal to said scanning driving circuit,
- wherein said processing unit comprises:
- a polarity inversion notification signal generating unit which compares, for each data line driving circuit, a gray level of said data signal with a gray level of said data signal before being transmitted to a corresponding one of said data line driving circuits, and if an amount of change in gray level is larger than a predetermined value, performs inversion of all polarities of said data signal to transmit to the corresponding one of said data line driving circuits and generates a polarity inversion notification signal showing that a polarity of said data signal has been already inverted to transmit to the corresponding one of said data line driving circuits through a corresponding notification signal transmission wiring;
- and
- a polarity inversion notification signal initial polarity setting unit which sets, for each notification signal transmission wiring, an initial polarity of said polarity inversion notification signal to be generated by said polarity inversion notification signal generating unit;
- and
- wherein each of said data line driving circuits inverts a polarity of the transmitted data signal based on said polarity inversion notification signal.
8 more elements
A transmission signal control method to be applied to an image display device comprising:
- a display panel including a plurality of display regions each having predetermined columns of data lines, predetermined rows of scanning lines, and a plurality of pixel each disposed at an intersection between each of said data lines and each of said scanning lines;
- a plurality of data line driving circuits each arranged on data line terminal side margins of said display panel to write pixel data, based on a transmitted data signal, to each of each of said data lines in a corresponding display region;
- a scanning line driving circuit to output a scanning driving signal to drive each of said scanning lines in a predetermined order based on a given scanning control signal;
- and
- a signal processing unit, based on a given video signal, to generate a data signal and to transmit the generated data signal to a corresponding one of data line driving circuits through a corresponding data signal transmission wiring and to generate said scanning control signal and to transmit the generated scanning control signal to said scanning driving circuit, and
- said transmission signal control method comprising:
- inverting polarities of all data signals, when a gray level of said data signal is compared with a gray level of said data signal occurred before being transmitted to each of data line driving circuits and if an amount of change in gray level is larger than a predetermined value, by using a polarity inversion notification signal generating section mounted on said signal processing unit, for each of said data line driving circuits, to transmit to a corresponding one of said data line driving circuits and generating a polarity inversion notification signal showing that polarities of all said data signals have been inverted to transmit to each of said data line driving circuits through said notification signal transmission wiring;
- setting, for every notification signal transmission line, an initial polarity of said polarity inversion notification signal to be generated by said polarity, inversion notification signal generating section mounted on a polarity inversion notification signal initial polarity setting section;
- and
- inverting a polarity of said transmitted data signal based on said polarity inversion notification signal by using each of said data line driving circuits.
7 more elements
Dependencies are inferred from the claim text.