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Drive pulse controller of plasma display apparatus

A display device and display technology, applied to static indicators, instruments, etc., can solve the problem that the feeling of screen incongruity cannot be completely removed

Inactive Publication Date: 2003-11-05
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has a problem that even if the fixed amplification factor of the gain is changed, because the driving pulse becomes 2 times and 3 times in the changing stage, the sense of incongruity of the screen cannot be completely removed when the change occurs

Method used

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  • Drive pulse controller of plasma display apparatus
  • Drive pulse controller of plasma display apparatus
  • Drive pulse controller of plasma display apparatus

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0106] Fig. 9 shows a block diagram of the display device of the first embodiment. Input 2 receives R, G, B signals. The vertical synchronous signal and the horizontal synchronous signal are input to the timing pulse generator 6 from the input terminals VD and HD respectively. A / D converter 8 receives R, G, B signals and performs A / D conversion. The A / D-converted R, G, B signals are subjected to reverse gamma correction by the reverse gamma correction device 10 . Before inverse gamma correction, each level of R, G.B signals, from the minimum value of 0 to the maximum value of 255, according to the 8-bit signal, is sequentially expressed as 256 different linear levels (levels) (0, 1, 2, 3, 4, 5, ... 255). The next inverse gamma correction, each level of R, G.B signals, from the minimum value of 0 to the maximum value of 255, according to the 16-bit signal, is displayed as 256256 linear different levels with an accuracy of approximately 0.004.

[0107] The R, G.B signals aft...

no. 2 example

[0126] FIG. 11 is a parameter determination diagram used in the second embodiment, and is utilized by the image characteristic determination means 30 in the block diagram shown in FIG. When using the parameter determination map of FIG. 11, the average level detector 28 in the block diagram of FIG. 9 can be omitted because the average level signal Lav is not used.

[0127] The horizontal axis of FIG. 11 represents the peak level, and the vertical axis represents the fixed amplification factor A. The graph of Figure 11 is divided into columns, in the example of Figure 11, from the higher level to 2.75 / 3.00 is C11, from 2.75 / 3.00 to 2.50 / 3.00 is C12, from 2.50 / 3.00 to 2.25 / 3.00 is C13, From 2.25 / 3.00 to 2.00 / 3.00 is C14, from 2.00 / 3.00 to 1.75 / 3.00 is C15, from 1.75 / 3.00 to 1.50 / 3.00 is C16, from 1.50 / 3.00 to 1.25 / 3.00 is C18, and the following is C19. Four parameters are specified for each column: the N times mode value N; the fixed amplification factor A of the amplifier 12; t...

no. 3 example

[0136] Fig. 12 is a block diagram showing a display device according to the third embodiment. And is utilized by the image characteristic determination means 30 in the block diagram shown in FIG. 9 . When using the parameter determination map of FIG. 13, both the average level detector 28 and the peak level detector 26 in the block diagram of FIG. 9 are used because both the peak level signal Lpk and the average level signal Lav are used.

[0137] The horizontal axis in FIG. 12 represents the average level Lav, and the vertical axis represents the peak level. The graph in Figure 12 is divided into columns by lines parallel to the vertical axis and into rows by lines parallel to the horizontal axis. In the example of FIG. 10 , it is divided into 9 columns along the horizontal axis at a distance of approximately 10% from the upper level and into 10 rows along the vertical axis at a distance of 0.25 from the higher level. So a total of 90 fragments are possible. The above-ment...

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Abstract

A display device having an adjusting device requiring image brightness data and adjusting weighting coefficient N according to the brightness data. The weighting coefficient N not only takes a positive integer, but also takes a fraction. Accordingly, even if the weighting coefficient N is changed, sudden changes in brightness will not occur, and people watching the screen will not feel uncomfortable.

Description

technical field [0001] The invention relates to a display device, in particular to a display drive pulse controller for a plasma display panel (PDP) and a digital micromirror device. Background technique [0002] PDP and DMD display devices use the sub-field method, the display device has a binary memory, and displays dynamic images with halftones through the transient superposition of multiple binary images that have been weighted. The following explanations are for PDPs, but DMDs are equally applicable. [0003] The PDP subfield method is explained below using FIGS. 1 , 2 and 3 . [0004] Consider here a PDP having pixels arranged in 10 rows and 4 columns, as illustrated in FIG. 3 . Each pixel R, G, and B is eight bits, assuming that the brightness is presented, and it is assumed that the displayed brightness may be 256 levels (256 gray scales). The following explanations are for G signals unless otherwise specified, but these explanations are also applicable to R and B...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/296G09G3/20G09G3/28G09G3/291G09G3/34
CPCG09G3/2022G09G3/2033G09G3/2037G09G3/2059G09G3/2803G09G3/288G09G2320/0261G09G2320/0266G09G2320/0271G09G2320/0276G09G2320/041G09G2320/0626G09G2320/106G09G2360/144G09G2360/16G09G3/296
Inventor 笠原光弘石川雄一森田友子
Owner PANASONIC CORP
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