JP2002341827A - Display controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display controller in which fluctuation in power consumption caused by the contents to be displayed is suppressed and the power consumption is reduced. SOLUTION: A device CPU 2 outputs display data which are to be displayed on a display device 3 to a display device controller 1. In the controller 1, the luminance, that is beforehand set, of RGB colors having large power consumption (green, for example) is adjusted from the luminance specified by the display data to lower luminance in which beforehand set display quality does not change substantially by a luminance adjusting circuit 11, display data equivalent to one horizontal direction line are successively outputted by a horizontal direction control circuit 12 and a vertical direction control circuit 13 successively scans the horizontal direction lines in a vertical direction in synchronism with the output data and the display data are displayed on the device 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an organic EL (Electr
The present invention relates to a display control device for controlling a display such as a display using a Luminescence element.

[0002]

2. Description of the Related Art Conventionally, this type of display control apparatus controls individual organic EL elements for each pixel in RGB for either active or passive driving, and changes the luminance of each color to achieve full color. (Japanese Unexamined Patent Publication No.
No. 0-12377).

[0003]

However, such a conventional display control device employs a control method similar to that of an LCD (Liquid-Crystal Display) panel or the like in which power consumption does not depend on a display color, and controls each color of RGB. Therefore, in the organic EL element whose power consumption depends on the display color, there is a problem that the power consumption varies depending on the content of the content to be displayed.

[0004] In addition, despite the use of an organic EL element, which is one of the features of low power consumption, the power consumption is slightly lower than that of a conventional full-color LCD with a backlight, even though the backlight is lit. There is a problem that the number of LCD panels is increased as compared with the LCD panel when the backlight is not lit.

The present invention has been made to solve such a problem, and it is an object of the present invention to provide a display control device capable of suppressing power consumption variation due to the content of a displayed content and reducing power consumption. .

[0006]

A display control device according to the present invention is a display control device for controlling a display of a display device using an organic EL element which is a self-luminous type device. It has a configuration including a brightness adjustment circuit that lowers the brightness of the organic EL element by a preset value.
With this configuration, the luminance of the organic EL element of a preset color is reduced.

Here, the brightness adjustment circuit performs a process of reducing the full color by using a color palette for reducing the full color, and sets the upper limit of the brightness of the preset color of the color palette to the preset color. It is preferable to decrease by the value. With this configuration, the luminance of a preset color is lower than the upper limit of the color pallet.

Further, it is preferable that the brightness adjusting circuit lowers the brightness of the preset color from a value designated in a color palette by a preset value. The luminance of the color set in advance is reduced from the value set in the color palette.

Further, a display control device of the present invention is a display control device for controlling display of a display device using an organic EL element which is a self-luminous device, and detects a display mode for the display device. It has a configuration including a display mode detecting unit and the luminance adjusting unit that adjusts the luminance of the organic EL element according to the display mode detected by the display mode detecting unit. With this configuration, the luminance is adjusted according to the display mode detected by the display mode detection unit.

[0010] Here, it is preferable that the brightness adjusting means performs adjustment for lowering the brightness when the display mode is a display mode in which display quality is not required. With this configuration,
In a display mode in which display quality is not required, the brightness is reduced.

Further, it is preferable that an instruction input unit for detecting an instruction input from a user is provided, and the luminance adjustment unit adjusts the luminance in accordance with a luminance adjustment instruction from the user detected by the instruction input unit. With this configuration, the brightness is adjusted according to the user's brightness adjustment instruction.

Further, the display control device of the present invention is a display control device for controlling display of two display devices, an organic EL display device using an organic EL element which is a self-luminous device, and an LCD display device. A display mode detecting means for detecting a display mode on the display device; and a display for selecting and displaying one of the organic EL display device and the LCD display device according to the display mode detected by the display mode detecting means. And a device selecting means. With this configuration, the organic EL display device or the LCD display device is selected according to the display mode detected by the display mode detecting means.

Here, it is preferable that the display device selecting means selects and displays the LCD display device when the display mode is a display mode in which display quality is not required. With this configuration, in the display mode in which the display quality is not required, the image is displayed on the LCD display device.

Further, an instruction input means for detecting an instruction input from a user is provided, and the display device selecting means comprises:
It is preferable that the display device is selected in accordance with the display device switching instruction from the user detected by the instruction input unit. With this configuration, the display device is switched according to a user's instruction.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a display device according to a first embodiment of the present invention.

As shown in FIG. 1, in the display device according to the present embodiment, a display device controller 1 and a device CPU 2 for controlling the entire device constitute a display control device.
The luminance of the display data output by the PU 2 is adjusted by the luminance adjustment circuit 11 of the display device controller 1, and the display data for one line in the horizontal direction is sequentially output by the horizontal direction control circuit 12. The direction control circuit 13 sequentially scans the horizontal lines in the vertical direction to display the display data on the display device 3.

In such a display device, the power consumption increases as the luminance increases, and decreases as the luminance decreases. Therefore, the luminance adjustment circuit 11 uses a predetermined RGB (Red-Green-Blue) power consumption. The luminance of the color (for example, green) is reduced from the luminance specified by the display data to the luminance at which the display quality previously set does not largely change. With this configuration, it is possible to suppress variations in power consumption between display contents having different RGB data and reduce power consumption.

As a first other aspect of the present embodiment,
The brightness adjustment circuit 11 adjusts the brightness of each of the RGB colors using a color palette, and the RGB with high power consumption is used.
The upper limit of the color palette (for example, green) is set low enough that the display quality does not significantly change. With such a configuration, variation in power consumption between display contents having different RGB data can be suppressed, and power consumption can be reduced.

As another second aspect of the present embodiment,
The luminance adjustment circuit 11 adjusts the luminance of each of the RGB colors using a color palette, and a luminance value of a preset RGB color (for example, green) having a large power consumption is designated in the color palette. The value shifts in the dark direction at a stage where the preset display quality does not significantly change from the value. With such a configuration, variation in power consumption between display contents having different RGB data can be suppressed, and power consumption can be reduced.

As a third other mode of the present embodiment,
The device CPU (display mode detecting means) 2 is a display device 3
The display state (display mode) is determined. For example, in the case of a mobile phone terminal, when displaying a standby screen in which the user often does not look at the display, a process of reducing the brightness of the display data is performed, and the brightness is reduced. The reduced display data is output to the display device controller 1, and in displaying a photograph, a game, or the like that requires display quality, a process of reducing the brightness of the display data is performed. With such a configuration, it is possible to reduce power consumption when displaying data that does not require display quality such as in standby mode, and
When displaying data that requires display quality, high-quality display can be provided to the user.

In another embodiment, the device CPU
2, the display data is output to the display device controller 1, and the mode of the display data (for example, the type of standby, photograph, game, etc.) is displayed together with the display data from the device CPU 2. 1, the display device controller 1 may determine the mode, and the brightness may be adjusted by the brightness adjustment circuit 11 for display.

FIG. 2 is a diagram showing a display device according to a second embodiment of the present invention. Note that the present embodiment is different from the first embodiment described above.
Since the configuration is substantially the same as that of the first embodiment, the same reference numerals are given to the same components, and only the characteristic portions will be described.

As shown in FIG. 2, the display device of the present embodiment is provided with an input device (instruction input means) 4 for detecting an instruction input from a user and notifying the content to the device CPU 2. Analyzes information notified from the input device 4 and displays an instruction from the user in a display mode (a mode in which display quality is not restricted and a mode in which high-quality display is performed).
In this case, the display device controller 1 is notified of a display mode switching instruction.

When the display device controller 1 receives the display mode switching instruction, the display device controller 1 determines the stored current mode, and if the current mode is a mode for performing high-quality display, a preset power consumption is set. The luminance of the RGB color (for example, green) of which is large is reduced from the luminance designated by the display data to a luminance at which the display quality previously set does not largely change, and the mode is switched to a mode that is not particular about the display quality.

If the current mode is a mode that does not stick to display quality, the brightness of a preset RGB color (for example, green) lowered to the preset brightness is changed to the brightness specified by the display data. Return to switch to the mode for high-quality display.

With this configuration, the display mode can be switched according to the user's instruction, and the power consumption can be reduced according to the user's preference.

In the present embodiment, the display device controller 1 switches the brightness in accordance with the display mode switching. However, the device CPU 2 switches the display mode to a mode that is not restricted to display quality by switching the display mode. Performs a process of lowering the brightness of a predetermined RGB color of the display data, outputs the display data with the reduced brightness to the display device controller 1, and switches to a mode for performing high-quality display by changing the display data. You may make it output to the display device controller 1 as it is.

FIG. 3 is a diagram showing a display device according to a third embodiment of the present invention. As shown in FIG. 3, in the display device according to the present embodiment, a device CPU 5 for controlling the entire device, an organic EL display controller 6, and an LCD display controller 7 constitute a display control device.
The display controller 6 is connected to an organic EL display device 8 which is a display device having a high display quality but of a self-luminous type and having high power consumption, and controls the display of the organic EL display device 8. LCD display controller 7
Is connected to an LCD display device 9 that cannot perform color display and has low display quality but low power consumption, and controls the display of the LCD display device 9.

The device CPU (display mode detecting means) 5
The display state (display mode) is determined. For example, in the case of a mobile phone terminal, display data is output to the LCD display controller 7 when a standby screen whose display content is limited to a clock, an antenna display, a battery level, and the like is displayed. LCD
The display is performed on the display device 9, and in the display of a photograph or a game requiring display quality, display data is output to the organic EL display controller 6 to be displayed on the organic EL display device 8. With such a configuration, it is possible to reduce power consumption when displaying data that does not require display quality such as in standby mode.
When displaying data that requires display quality, high-quality display can be provided to the user.

In this embodiment, the display state is determined and the display device is selected. However, if the display content is text data or other photo or moving image data, the display device is selected. The display data is output to the LCD display controller 7 to be displayed on the LCD display device 9, and if it is other photographic or moving image data, the display data is output to the organic EL display controller 6 and displayed on the organic EL display device 8. May be.

FIG. 4 is a diagram showing a display device according to a fourth embodiment of the present invention. Note that this embodiment is similar to the third embodiment.
Since the configuration is substantially the same as that of the first embodiment, the same reference numerals are given to the same components, and only the characteristic portions will be described.

As shown in FIG. 4, the display device of the present embodiment includes an input device (instruction input means) 10 for detecting an instruction input from a user and notifying the device CPU 5 of the content. Analyzes the information notified from the input device 4, determines that the instruction from the user is to switch the display device (the organic EL display device 8 and the LCD display device 9), and determines the display device that is currently displayed, If the currently displayed display device is the organic EL display device 8, the organic EL display controller 6
The display data is output to the LCD display controller 7 and the LCD display device 9 is switched to display the display data.

If the currently displayed display device is the LCD display device 9, the output of the display data to the LCD display controller 7 is stopped, the display data is output to the organic EL display controller 6, and the display data is output to the organic EL display device 8. Switch to display.

With this configuration, the display device can be switched according to the user's instruction.
Power consumption can be reduced according to user preference. The display device switching instruction is notified to the display device controller 1.

FIGS. 5 and 6 show a display device according to a fifth embodiment of the present invention. As shown in FIG. 5, in the display device of the present embodiment, the display device controller 20 and a device CPU 30 that controls the entire device constitute a display control device, and display data output by the device CPU 30 is
Horizontal control circuit 21 of display device controller 20
The display data is displayed on the display device 40 by the vertical control circuit 23.

As shown in FIG. 6, in the display control of this display device, pixels each having a combination of organic EL elements that emit RGB light are arranged in a grid on the display device 40.
The vertical control performed by the vertical control circuit 23 is one for each screen.
A control (interlace control) for displaying by skipping lines (displaying an odd line and an even line alternately) is performed. The horizontal control of the horizontal direction control circuit 21 is performed to display data for one horizontal line in accordance with the vertical direction control. A voltage for causing each corresponding organic EL element to emit light is sequentially applied.

According to this configuration, since the control in the vertical direction is thinned out (skipped and interlaced), variation in power consumption between display contents having different display data can be suppressed, and power consumption can be reduced. .

[0038]

As described above, according to the present invention, by adjusting the luminance of the organic EL element which is a self-luminous display device, variation in power consumption due to the content of the content to be displayed is suppressed, and power consumption is reduced. It is possible to provide a display control device that can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram illustrating a display device according to a first embodiment of the present invention.

FIG. 2 is a schematic block diagram illustrating a display device according to a second embodiment of the present invention.

FIG. 3 is a schematic block diagram illustrating a display device according to a third embodiment of the present invention.

FIG. 4 is a schematic block diagram showing a display device according to a fourth embodiment of the present invention.

FIG. 5 is a schematic block diagram showing a display device according to a fifth embodiment of the present invention.

FIG. 6 is a configuration diagram illustrating a display control method of a display device according to a fifth embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 display device controller 2 device CPU (display mode detecting means) 3 display device 4 input device (instruction input means) 5 device CPU (display mode detecting means) 6 organic EL display controller 7 LCD display controller 8 organic EL display device 9 LCD display Device 10 Input device (instruction input means) 11 Brightness adjustment circuit 12 Horizontal control circuit 13 Vertical control circuit 20 Display device controller 21 Horizontal control circuit 23 Vertical control circuit 30 Device CPU 40 Display device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat ゛ (Reference) G09G 3/20 G09G 3/20 642J 680 680D H05B 33/08 H05B 33/08 33/12 33/12 B 33 / 14 33/14 A

Claims (9)

[Claims] 1. A display control device for controlling a display of a display device using an organic EL element which is a self-luminous type device, wherein the luminance of an organic EL element of a preset color is set to a predetermined value. A display control device comprising a brightness adjustment circuit for lowering brightness. 2. The brightness adjustment circuit performs a process of reducing full color by a color palette for reducing full color, and sets an upper limit value of the brightness of the preset color of the color palette to the preset value. The display control device according to claim 1, wherein the display control device is lowered by only one. 3. The display control device according to claim 2, wherein the brightness adjustment circuit reduces the brightness of the preset color by a preset value from a value designated in a color palette. 4. A display control device for controlling display of a display device using an organic EL element which is a self-luminous type device, comprising: display mode detecting means for detecting a display mode on the display device; A display control device, comprising: the luminance adjustment unit that adjusts luminance of the organic EL element according to a display mode detected by a mode detection unit. 5. The display control device according to claim 4, wherein said brightness adjustment means performs an adjustment to reduce brightness when said display mode is a display mode in which display quality is not required. 6. An instruction input means for detecting an instruction input from a user, wherein the luminance adjustment means adjusts luminance according to a luminance adjustment instruction from the user detected by the instruction input means. 6. The display control device according to 4 or 5. 7. A display control device for controlling display of two display devices, an organic EL display device using an organic EL element, which is a self-luminous device, and an LCD display device, wherein a display on the display device is provided. Display mode detecting means for detecting a mode, and display device selecting means for selecting and displaying one of the organic EL display device and the LCD display device according to the display mode detected by the display mode detecting means. Characteristic display control means. 8. The display control according to claim 7, wherein the display device selecting means selects and displays the LCD display device when the display mode is a display mode in which display quality is not required. apparatus. 9. An input device for detecting an input of an instruction from a user, wherein the display device selecting unit selects a display device in accordance with a display device switching instruction from the user detected by the instruction input unit. The display control device according to claim 7 or 8, wherein