JP2007108602A - Screensaver display method of panel display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable fade-in/out display while keeping a hue of a present image with respect to a screensaver display method of a panel display device. <P>SOLUTION: The screensaver display method of the panel display device determines respective addition or subtraction values to R, G, B values of display image data depending on the magnitude of respective values of the R, G, B values, respectively, during fade-in or fade-out operation of the display image data indicated by RGB three primary colors (the R, G, B values). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a screen saver display method for a panel display device, and more particularly to a fade-in or fade-out display operation.

Recently, the flat display field has been dramatically developed. In particular, an organic EL display panel has attracted attention in place of a liquid crystal display (LCD) as a display panel for a mobile phone or a portable audio.
The organic EL panel is excellent in viewability and color feeling and can be enlarged in size, but has a drawback that the product life is short due to the seizure of the panel.
About this subject, it is disclosed by patent document 1, for example.
As a measure to overcome this drawback, the screen saver function is effective.
In addition, for mobile phones, power consumption is required to be reduced, and a screen saver function by hardware that does not involve rewriting image data is more effective than a screen saver realized by software.

Further, in the conventional display control, when performing a fade operation such as fade-in / fade-out, a luminance adjustment circuit is provided to control the luminance signal of the display.
Alternatively, it is realized by simply subtracting and adding “1” to the display image data of RGB three primary colors.

FIG. 1 is a block diagram of a prior art that simply subtracts RGB three primary colors.
In FIG. 1, an organic EL driver 20 for a mobile phone enables display control of an organic EL display panel by a column interface 11 and a row interface 12 under the control of a CPU interface 10.
Inside the driver, the CPU bus IF 21 supports CPU write / read control, and the RAM rewriting unit 22 stores the display image in the built-in graphic RAM 23. In addition, a transmitter 27 is provided inside, and the timing control unit 24 performs timing control on the panel display control side.
The FIO (FadeInOut) control unit 25 reads RGB three primary color (RGB * 6 bit) data from the display RAM, and modifies the display data according to the fade-in / fade-out control circuit generated by the FIO timing control 26. Implemented and realized the fade operation.
Data subjected to the fade operation process by the FIO control unit is subjected to column control from the column driver 28 and scan line selection is performed by the row driver 29.

Next, FIG. 2 shows a state of data processing of the FIO control unit in the prior art.
In this example, consider the case where the data stored in the display RAM is R = 63, G = 16, and B = 32.
During the fade-out operation, processing is performed from n = 0 to n = 63, and Rn, Gn, and Bn are “−1” and maintained at “0” until “0” is reached each time n is counted up.
At the start of the fade operation, after receiving an instruction to start the fade-in / fade-out display operation from the CPU by the CPU interface 10 in FIG. 1, the control circuit autonomously implements the FIO control shown in FIG.
FIG. 5 shows a conventional display image. (1) is a display image when n = 0 (image of display RAM), (2) is a display image when n = 21, and (3) is a display image when n = 42.
JP 2001-318650 A

However, in the display control, when a luminance adjustment circuit for performing a fade operation is provided, there is a problem that the circuit configuration becomes complicated or extra CPU control is required, resulting in an increase in cost and current consumption. Further, when the fade operation is performed by the luminance adjustment circuit, there is a drawback that only the white or black display can be faded. In addition, when performing fade display other than white or black, there is a drawback that a luminance adjustment circuit is required for each of RGB.
Alternatively, when the display image data of the RGB three primary colors is simply reduced and incremented by “1”, the hue of the original image is changed.

  In order to solve this problem, the present invention provides a control block that controls the display image data of the three primary colors of RGB with a subtractive addition algorithm that does not change the hue, thereby fading in and maintaining the hue of the current image. Out display is possible.

  The screen saver display method of the panel display device of the present invention is such that the display image data R value and G value are displayed at the time of fade-in or fade-out display operation of the display image data indicated by RGB three primary colors (R value, G value, B value). Each addition value or each subtraction value with respect to the B value is determined according to the size of each of the R value, the G value, and the B value.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is provided to the same structure through all the drawings.

  FIG. 3 shows a configuration diagram of the first embodiment. Compared with the configuration diagram of the prior art, only the arithmetic expression of the FIO control unit 25 is changed.

The screen saver display method of the panel display device according to the present invention is based on the original image value at the time of fade-in or fade-out display operation of display image data represented by the three primary colors RGB (R value, G value, B value). Regardless of whether it is uniformly “± 1”, in the present invention, each added value or each subtracted value for the R value, G value, and B value of the display image data is expressed as R value, G value, B value. Each value is determined according to the magnitude of each value.
Here, the R value is data indicating the red luminance of the image data, the G value is data indicating the green luminance of the image data, and the B value is data indicating the blue luminance.
The image data is represented by, for example, 6-bit data composed of the R value, the G value, and the B value.

For example, in the first embodiment, a result obtained by dividing the multiplication result of the control timing from the original image and the FIO timing control unit 26 by “64” is subtracted.
For example, the R value of the control timing n is expressed by the following equation.
Rn = Ro− (Ro * n / 64) −1 (n is an integer greater than or equal to 0, Ro is an initial value of the R value)
Therefore, control is performed with a control algorithm in which the subtraction value increases as the value of the original image increases. Further, “−1” is used because there is a numerical value after the decimal point that is rounded down by the right shift, so that a value of “0” is always obtained when n = 63.

FIG. 4 shows display image transition in the first embodiment.
FIG. 4 shows each R value, G value, and B value at control timing n (an integer from 0 to 63).
In FIG. 4, focusing on the value at n = 3, Rn is subtracted by “−1” by “−1” to “60”, whereas the data where Gn is “16” is still “ It can be seen that it is 15 ″ and is subtracted according to the ratio of the original image.

  Comparing FIG. 2 and FIG. 4, the data in which Gn is “16” is finally “0” in FIG. 2 at n = 16, but finally in FIG. 4 at n = 60. It can be seen that the transition is to “0”.

  FIG. 6 shows a display image in the second embodiment. As can be seen by comparing FIG. 5 and FIG. 6, (1) is the same because both FIG. 5 and FIG. 6 are original images, but in FIG. 5, the contrast in FIG. 5 is larger. That is, a part of the image is in a state where the color stands out compared to the original image.

On the other hand, FIG. 6 is close to an image in which the luminance of the original image is reduced, and the hue of the original image can be maintained.
Since the organic EL is excellent in color feeling, the change in the hue appears remarkably, so the first embodiment is very effective.

  The fade-in / fade-out display operation includes a 1 TIME mode in which the transition from the original image to the black display is stopped and the fade operation is stopped, and a REPEAT mode in which the fade operation of the black display is repeatedly performed from the original image.

  Furthermore, when combined with display ON, fade-in display starts from the black display in the display-off state to fade-in from the original image to start the display operation. Variations such as display-off and fade-out OFF display after the display operation are also possible.

Next, FIG. 7 shows a configuration diagram of the second embodiment.
Compared with the first embodiment, the arithmetic expression of the FIO control unit 25 is changed, and the fade-out stop setting Kr, Kg, Kb (each 6 bits) and the division coefficient Kd are pulled into the FIO control unit by CPU control. It is out.
This Kd is obtained by parameterizing the division value to be divided from the original image stored in the display RAM, and can be variably set.

Further, when the fade-out display is performed from the original image, the image data value for stopping the fade-out is parameterized, and the same variable setting is possible.
By parameterizing this fade-out stop setting (Kr, Kg, Kb), not only fade-in / out display between the original image and the black image but also fade-in / out display between the original image and the intermediate data is possible. It becomes.
For example, in the REPEAT mode, the fade-out display is performed from the original image display, the fade-out stop setting image (Kr, Kg, Kb) is displayed, then the fade-in display is performed again to the original image, and the display operation can be repeated thereafter. Become.

Furthermore, RGB individual fade operations can be performed, and color fade display can be supported, thereby greatly expanding the variation of the screen saver display range.
For example, when Kg = 63, a fade operation is performed in which only the G does not perform a fade operation, and it is possible to display by changing the hue intentionally.

Although the first and second embodiments have been described as applied to the screen saver of the organic EL panel display, the first and second embodiments can also be applied to control of a liquid crystal panel and various display panels that employ similar display control.
Further, in the first embodiment, the division value of the RGB arithmetic expression is described as “64”, but an integer value m that can maintain the hue can be used.
Rn = Ro- (Ro * n / m) -1

The block diagram explaining the conventional organic EL driver. The figure which shows the mode of the transition of the conventional display image. The block diagram explaining the organic EL driver in Example 1 of this invention. The figure which shows the mode of the transition of the display image in Example 1 of this invention. The figure which shows the mode of the fade-in / fade-out of the conventional display image. The figure which shows the mode of the fade-in / out of the display image in Example 1 of this invention. The block diagram explaining the organic EL driver in Example 2 of this invention.

Explanation of symbols

10 CPU interface 11 Column interface 12 Row interface 20 Organic EL driver 21 CPU bus IF
22 RAM rewriting unit 23 Display RAM
24 Timing control unit 25 FIO control unit 26 FIO timing control unit 27 Transmitter 28 Column driver 29 Row driver

Claims (3)

In the screen saver display method of the panel display device,
In the fade-in or fade-out display operation of the display image data indicated by RGB three primary colors (R value, G value, B value), the respective addition values for the R value, the G value, and the B value of the display image data, Or each subtraction value is determined according to the magnitude | size of each value of said R value, said G value, and said B value, respectively, The screensaver display method characterized by the above-mentioned. In the screen saver display method of the panel display device,
A fade-in-out image processing circuit that performs arithmetic processing on image data Dn (n is an integer of 0 or more) based on an expression represented by Dn = Do− (Do * n / m) −1 (m is a predetermined integer). Provided,
A screen saver display method for a panel display device, which realizes a fade-in / fade-out display operation while maintaining a hue during a fade-in / out display operation in screen saver display. In the screen saver display method of the panel display device,
A circuit for setting and holding the fade-in / out stop setting Kn and the division coefficient m;
A fade-in / out image processing circuit for performing arithmetic processing on image data Dn (n is an integer of 0 or more) based on an expression represented by Dn = Do− (Do * n / m) −1 (m is a predetermined integer); ,
A fade-in / out control circuit is provided to return the fade-in / out result when the fade-in / out stop fade setting Kn is reached.
A screen saver display method for a panel display device, which realizes a color fade display operation by variably setting calculation coefficients of a fade-in / out image processing circuit and a fade-in / out control circuit.

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