JP2003233344A5

JP2003233344A5 -

Info

Publication number: JP2003233344A5
Application number: JP2002178456A
Authority: JP
Filing date: 2002-06-19
Publication date: 2005-10-27
Anticipated expiration: 2022-06-19

Claims

A plurality of row wirings and column wirings, a display panel connected to them and including image forming elements arranged on a matrix;
Scanning means for sequentially selecting and scanning the row wiring;
Corresponding to the input image data, corrected image data calculating means for calculating corrected image data whose data value is larger than the input image data value;
Adjusting means for adjusting the corrected image data or the value of the image data;
Modulation means connected to the column wiring, using the output from the adjustment means as an input, and outputting a modulation signal to the column wiring ;
A has,
The adjustment unit includes a maximum value detection unit that detects a maximum value among the values of the corrected image data corresponding to all or a part of a display area, and a gain that calculates a gain to be multiplied by the corrected image data or the image data. And a calculation unit,
The gain calculating unit calculates the gain so that a value obtained by smoothing the maximum value or a plurality of maximum values detected corresponding to a plurality of frames is within an input range of the modulation means. Image display device.

The corrected image data, the corresponding to the image data, the image display apparatus according to claim 1 is a data for correcting the influence of the voltage drop therefore occurs in resistance of at least the row wiring.

The image display apparatus according to claim 1, wherein the corrected image data is data obtained by performing correction for compensating for a decrease in luminance caused by a voltage drop due to a resistance of the row wiring on the image data.

The image display apparatus according to any one of claims 1 to 3, characterized in that the value of the corrected image data to which the adjusted has a limiter to limit to fit perfectly to the input range of the modulating means.

The gain is the image display apparatus according to any one of claims 1 to 4, characterized in that adaptive gain is calculated for each frame.

The image display apparatus according to claim 5 , wherein the adjustment unit includes a filter unit for limiting a change in the gain for each frame.

The adjustment unit further includes a scene switching determination unit that detects that the scene of the display image has changed,
The image display apparatus according to claim 6 , wherein the filter unit does not perform a process that restricts a change in the gain when a scene change is determined.

The scene switching determination unit determines scene switching based on an inter-frame difference in average luminance level (APL) for each frame of input image data and / or a maximum inter-frame difference in corrected image data for each frame. The image display device according to claim 7 .

The adjusting means, the image display apparatus according to any one of claims 1 to 3, characterized in that it has a gain limiting section for limiting the gain to less than a preset upper-limit value.

The said maximum value detection part detects the maximum value of the correction | amendment image data in a predetermined area | region instead of the whole display area among the correction | amendment image data in a flame | frame, The any one of Claim 1 thru | or 3 characterized by the above-mentioned. whether the image display apparatus according to item 1.

The scene switching determination unit
The display area is divided into a plurality of areas, scene switching is determined for each area,
The image display device according to claim 7 , wherein scene switching of the entire screen is determined from a determination result for each area.

It said adjusting means detects the illuminance around the image display device, an external illuminance input unit for outputting a signal corresponding to the detection result, modulating the gain according to the output signal of the external illuminance input unit The image display device according to claim 1, wherein:

The adjusting means includes
Comprising a first operation mode for outputting the proper応型gain that will be calculated for each frame, and a second operation mode for outputting the fixed gain set in advance does not change from frame to frame, at least two modes of operation The image display apparatus according to claim 1 , wherein the image display apparatus is an image display apparatus.

The adjusting means includes
When the input video signal is a television video signal, the first operation mode is selected ,
14. The image display device according to claim 13 , wherein when the input video signal is a video signal for a computer, the second operation mode is selected .

A plurality of row wirings and column wirings, and a display panel connected to them and including image forming elements arranged on a matrix;
Scanning means for sequentially selecting and scanning the row wiring;
An image display device comprising: modulation means connected to the column wiring;
Corresponding to the input image data, corrected image data calculating means for calculating corrected image data whose data value is larger than the input image data value;
Adjusting means for adjusting the corrected image data or the value of the image data so that the value of the corrected image data falls within the input range of the modulating means;
The modulation means receives the output of the adjustment means as an input and outputs a modulation signal to the column wiring;
The corrected image data calculating means includes
Means for calculating an amount of voltage drop due to the resistance of the row wiring at each of a discrete horizontal display position and a discrete time within one horizontal scanning period based on the input image data;
Discrete corrected image data calculating means for calculating corrected image data corresponding to a discrete horizontal display position where the amount of voltage drop is calculated and a discrete time within one horizontal scanning period from the amount of voltage drop;
An image display apparatus comprising: corrected image data interpolating means for interpolating the output of the discrete corrected image data calculating means to calculate interpolated corrected image data.

The adjusting means includes
Means for multiplying the output of the discrete corrected image data calculating means by a gain for adjusting a value ; and further, the output of the corrected image data so that the output of the corrected image data interpolating means falls within the input range of the modulating means. The image display device according to claim 15 , further comprising a limiter for limiting the value .

The image display device according to claim 1, wherein the modulation signal is a signal whose pulse width is modulated based on the image data.

The image display apparatus according to any one of claims 1 to 17, wherein the image forming device is a surface conduction electron-emitting devices.