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Image display apparatus for writing display information with reduced electric consumption

An image display device, a technology for displaying information, applied in static indicators, instruments, identification devices, etc., to solve problems such as unnatural viewers

Inactive Publication Date: 2005-11-23
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These phenomena make the viewer feel very unnatural

Method used

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  • Image display apparatus for writing display information with reduced electric consumption
  • Image display apparatus for writing display information with reduced electric consumption
  • Image display apparatus for writing display information with reduced electric consumption

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] Figure 1 shows a block diagram of a plasma display PD1 structure using subfields to display grayscale images.

[0084] As shown in FIG. 1 , the plasma display PD1 includes an input image signal conversion unit 2 , a subfield information generation unit 3 , and a plasma display panel device 4 .

[0085] The input image signal conversion unit 2 includes a bit width setting unit 21 and an AND gate 22 .

[0086] The subfield information generating unit 3 converts an image signal supplied from the input image signal converting unit 2 into segments of on / off information (ie, subfield information). Here, the input image signal includes various gray levels for displaying pixels constituting one image on one screen. Each piece of on / off information or subfield information represents a combination of a group of subfields corresponding to one of the gray levels. Each subfield is pre-assigned with a luminance weight. Light emission is maintained with a luminance weighted corresp...

Embodiment 2

[0103] A plasma display PD2 according to the second embodiment of the present invention will be described, focusing on the differences from Embodiment 1.

[0104] FIG. 4 shows the relationship between gray levels contained in an input image signal and gray levels used to display an image in the case of the plasma display PD2. In other words, FIG. 4 shows the relationship between the input and output of the input image signal conversion unit 2 shown in FIG. 1 . Figure 5 shows a graph showing gray levels on the vertical axis vs input gray levels on the horizontal axis.

[0105] In this embodiment, the lower bits are intentionally fixed to "1" as the gray level decreases.

[0106] For example, when an image signal with a gray level of "10" (the subfield information for the input value is "001010") is input, the output gray level is also "10" (the subfield information for the output value The subfield information is "001010"). That is, since the input grayscale "10" has a low l...

Embodiment 3

[0112] A plasma display PD3 according to a third embodiment of the present invention will be described, focusing on differences from Embodiments 1 and 2.

[0113] FIG. 6 shows the relationship between the gray scale contained in the input image signal and the gray scale used to display the image in the case of the plasma display PD3. In other words, FIG. 6 shows the relationship between the input and output of the input image signal conversion unit 2 shown in FIG. 1 . Figure 7 shows the gray scale displayed on the vertical axis vs. A curve of input gray levels on the horizontal axis.

[0114] In this embodiment, the lower bits are intentionally fixed to "0" as the gray level decreases. But for a group of input gray levels close to the maximum gray level, the input gray levels are output when they are displayed as gray levels.

[0115] For example, when an image signal with a gray level of "10" (the subfield information for the input value is "001010") is input, the output g...

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Abstract

An image display apparatus for displaying gray-scale images by writing display information to an image display area of a panel. The display information includes values of a plurality of sub-fields that constitute one field. The image display apparatus converts an input image signal into a piece of display information so that a difference between sub-fields in correspondence with each other in adjacent high gray-scale levels becomes less. The image display apparatus displays a gray-scale image in accordance with the piece of display information.

Description

[0001] This application is a divisional application of an application dated August 23, 2001, application number 01135742.8, and title of the invention "image display device with reduced power consumption for writing display information". technical field [0002] The present invention relates to a display device, such as a plasma display. More particularly, the present invention relates to an image display device capable of reducing power consumption when writing display information. Background technique [0003] Typically, a display device, such as a plasma display, displays images based on a two-value display method. The display device divides a field in the time domain into multiple Brightness-weighted subfields are used to display grayscale images, and light emission is controlled on / off for each subfield. For example, in order to display an image with 256 gray levels, one field is divided into 8 subfields, and the luminance weights of the 8 subfields are assigned in tim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/293
Inventor 川原功关本邦夫
Owner PANASONIC CORP
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