JP2005091654A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device that does not overlook red as a warning color and does not require adjustment to a video circuit or a graphic circuit.
An external light illuminometer that detects the illuminance of external light and outputs an illuminance signal, a display information source that inputs a video signal and a signal from a graphic circuit, and switches and superimposes these signals, and the display A red emphasis means for emphasizing red according to the magnitude of the output signal of the external light illuminance meter by inputting the output of the signal source and the output of the external light illuminance meter, and the display device receiving the output signal from the red emphasis means Display device color conversion means for performing color conversion for the user, and luminance adjustment means for adjusting the luminance of the display device by inputting the output of the external light illuminometer.
[Selection] Figure 1

Description

  The present invention relates to a display device using a liquid crystal display panel mounted on, for example, an aircraft or a vehicle, and more particularly to a display device that prevents a reduction in red visibility due to external light.

  Conventionally, as a display device including a non-light-emitting display element that uses light incident from the outside, such as a liquid crystal display element, and displays the light by controlling transmission of the light, a transmissive display device using transmitted light, A reflection type display device using reflected light is known.

  The transmissive display device has a backlight arranged behind the display element and displays using the illumination light from the backlight, emits illumination light from the backlight toward the display element, and the light. Is emitted in front of the display element and displayed.

  The reflection type display device displays an external light that is light in the usage environment of the display device, and external light incident from the front of the display device is displayed on the display device by a reflection plate disposed behind the display device. The light is reflected toward the front, and the light is emitted to the front of the display device for display.

  There is also a non-light-emitting display device that combines a transmissive type and a reflective type, which performs display by using both light from the backlight and external light simultaneously. In the case of this display device, it varies depending on the use environment. The display luminance as a reflection type and the display performance as a transmission type are complemented by controlling the light emission luminance of the backlight according to the illuminance of outside light.

  A conventional display device that uses both backlight light and external light includes an illuminance detection sensor that detects illuminance of external light, and performs brightness adjustment based on the detection result of the illuminance detection sensor.

Prior art documents relating to such a conventional display device include the following.
Japanese Patent Laid-Open No. 06-339087 Japanese Patent Laid-Open No. 07-312292 JP 2000-111869 A

  Among them, the technique described in Japanese Patent Application Laid-Open No. 06-339087 relates to a brightness adjusting device for a picture tube that facilitates recognition of a character part of an image displayed on a screen even when the illuminance of external light increases. The brightness of one or both of the character means and the border portion of the image displayed on the screen of the picture tube of the image display is adjusted based on the output of the illuminance detection means.

  In addition, the technique described in Japanese Patent Application Laid-Open No. 07-31292 relates to a light control device capable of using a low-resolution A / D converter to reduce manufacturing cost, and an optical sensor that detects external light, It has a first amplifier for inputting the output from the optical sensor and a second amplifier for amplifying the output of the first amplifier, and corresponds to the signal value (V1) output from the first amplifier and the value of the signal. Brightness control data, a value (V2) of the signal output from the second amplifier and brightness control data corresponding to the value of the signal, storage means for storing in advance, and the signal (V1) or (V2) When the value is less than or equal to a predetermined value, luminance control data is determined based on the value of the signal (V2) output from the second amplifier, and when the value of the signal (V1) or (V2) exceeds the predetermined value, Output from one amplifier Determines the brightness control data based on the value of the signal (V1), is obtained so as to control the dimming of the lamp in accordance with the brightness control data.

  The technique described in Japanese Patent Application Laid-Open No. 2000-111869 controls the light emission luminance of the backlight following the change in the ambient illuminance while reducing the burden of interrupt processing for backlight control on the CPU. Illuminance detection means for detecting the illuminance of outside light and outputting an illuminance detection signal; and control timing for setting timing for controlling the light emission luminance of the light source according to the change state of the illuminance detection signal output from the illuminance detection means Control means for controlling the light emission luminance of the light source based on the illuminance detection signal output from the illuminance detection means at the control timing set by the setting means.

  FIG. 2 is a block diagram showing a conventional example of the present invention. In the figure, 1 is a video circuit for outputting a video signal, and 2 is a graphic circuit for outputting a graphic signal, which are arranged inside or outside the display. 3 is a display information source for inputting and switching video signals and graphic signals, and 4 is a color conversion means for performing color conversion for the display device, and 5 is a display device (LCD) which is arranged in the display. 6 is an external light illuminometer for measuring external light, and 7 is a luminance adjusting means for inputting an output signal of the illuminometer.

In the above-described configuration, the display information generated by the video circuit 1 and the graphic circuit 2 is converted into one display information by the display information switching superimposing circuit 3.
The converted information is displayed on the display device 5 after color conversion (RGB, YUV format) suitable for the display device is performed by the display device color conversion means 4.
The brightness adjustment of the display screen is automatically or manually adjusted by the brightness adjusting means 7 according to the external light illuminance measured by the external light illuminometer.

By the way, in the above-mentioned conventional example, when the illuminance of outside light decreases, it is usually used with the brightness of the display screen lowered. In that case, the brightness of all colors decreases at an equal rate.
Human visual sensitivity differs depending on whether the luminance is high or low. When the luminance is low, red cannot be recognized. That is, when the external light illuminance decreases, red recognition becomes difficult.

However, red is an important color used for alarms and the like, and a decline in cognition is not allowed.
Conventionally, the video circuit 1 and the graphic circuit 2 perform color conversion by manually or automatically enhancing red (relatively lowering green and blue) when the illuminance is reduced or changing the graphic software. It was necessary to display the figure with the red part enlarged. However, the video circuit 1 and the graphic circuit 2 may be outside the display, and are not actually performed.

  The present invention provides a color conversion means in the display device color conversion means that manually or automatically enhances red (relatively reduces green and blue) when the external light illuminance decreases, and reduces the display screen brightness when the external light illuminance decreases. An object of the present invention is to provide a display device that can perform red emphasis suitable for a display device even if the reduction is performed and does not cause a decrease in red recognition.

In order to achieve such a problem, the invention according to claim 1 of the present invention is:
In a display device having a non-light-emitting display panel using a light source and external light, an external light illuminometer that detects the illuminance of the external light and outputs an illuminance signal, a video signal, and a signal from a graphic circuit are input. A display information source that switches and superimposes these signals, and an output of this display information source and an output of the external light illuminance meter, and a red emphasis that emphasizes red according to the magnitude of the output signal of the external light illuminance meter A display device color conversion unit that inputs an output signal from the red enhancement unit and performs color conversion for the display device; and a luminance adjustment unit that inputs the output of the external light illuminance meter and adjusts the luminance of the display device. I have. Therefore, red as a warning color is not overlooked.

  According to a second aspect of the present invention, in the display device according to the first aspect, when the ambient light illuminance is increased and the red color is enhanced by the red color enhancement means, the green and blue signals are reduced to enhance the red color. ing.

  According to a third aspect of the present invention, in the display device according to the first or second aspect, the display panel is a transmissive type or a reflective type.

As is apparent from the above description, the present invention has the following effects.
According to the first to third aspects of the present invention, the external light illuminometer that detects the illuminance of the external light and outputs the illuminance signal, the video signal and the signal from the graphic circuit are input, and these signals are switched or superposed. A display information source, a red enhancement means for inputting the output of the display signal source and the output of the external light illuminance meter, and emphasizing red according to the magnitude of the output signal of the external light illuminance meter; Since the display device color conversion means for inputting the output signal and performing color conversion for the display device, and the brightness adjustment means for inputting the output of the external light illuminance meter and adjusting the brightness of the display device, red as a warning color is provided. There is no oversight. Further, since it is not necessary to adjust the video circuit or the graphic circuit, the configuration can be simplified.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is a block diagram showing an example of an embodiment of the present invention. In the figure, 1 is a video circuit for outputting a video signal, and 2 is a graphic circuit for outputting a graphic signal, which are arranged in the display or outside the display. Reference numeral 3 denotes a display information source for inputting, switching, and superimposing a video signal and a graphic signal. 4 is a color conversion means for performing color conversion for a display device, and 5 is a display device (LCD) which is arranged in the display. 6 is an external light illuminometer for measuring external light, and 7 is a luminance adjusting means for inputting an output signal of the illuminometer.

In the above-described configuration, the display information generated by the video circuit 1 and the graphic circuit 2 is converted into one display information by the display information switching superimposing circuit 3.
The converted information is displayed on the display device 5 after color conversion (RGB, YUV format) suitable for the display device is performed by the display device color conversion means 4.

  In the present invention, the output of the external light illuminometer is input to the red emphasis conversion means 10, and the colors of green and blue are reduced according to the output. As a result, the red color is relatively emphasized. The signal is output to the color conversion means 4 that performs color conversion for the display device as in the conventional case, and is displayed on the display device screen. Note that the screen of the display device is automatically or manually adjusted by the brightness adjusting means according to the external light illuminance measured by the external light illuminance meter 6.

  According to the above-described configuration, the output of the external light illuminometer 6 is input to the red enhancement conversion means, and the colors of green and blue are reduced according to the output. Therefore, even if the display screen brightness is reduced via the brightness adjustment means at the subsequent stage due to a decrease in the illuminance of external light, red enhancement suitable for the display device can be performed, and a reduction in red recognition does not occur.

It is a block block diagram which shows one Example of the display apparatus which concerns on this invention. It is a block structure figure which shows the conventional display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Video circuit 2 Graphic circuit 3 Display information source 4 Display device color conversion means 5 Display device 6 Ambient light illuminometer 7 Luminance adjustment means 10 Red emphasis conversion means

Claims (3)

  In a display device having a non-light emitting display panel using a light source and external light, an external light illuminometer that detects the illuminance of the external light and outputs an illuminance signal, a video signal, and a signal from a graphic circuit are input. A display information source that switches and superimposes these signals, an output of this display information source and an output of the external light illuminometer, and a red enhancement that emphasizes red according to the magnitude of the output signal of the external light illuminometer A display device color conversion means for inputting an output signal from the red emphasis means and performing color conversion for the display device; and a luminance adjustment means for inputting the output of the external light illuminance meter and adjusting the brightness of the display device. A display device comprising:   2. The display device according to claim 1, wherein when the illuminance of the external light is increased and red is emphasized by the red emphasis unit, red is emphasized by reducing green and blue signals. The display device according to claim 1, wherein the display panel is a transmissive type or a reflective type.

Images