CN101192389A - Liquid crystal display and contrast adjusting device and method thereof - Google Patents

Abstract

The invention discloses a liquid crystal display and a contrast adjusting device and method thereof. The contrast adjusting device and the method thereof provided by the invention can correct the contrast value of the liquid crystal display at any time according to the brightness change of the surrounding environment of the liquid crystal display so as to ensure that the liquid crystal display presents the most comfortable display image brightness for users to watch.

Description

Liquid crystal display and its contrast adjustment device and method

technical field

The present invention relates to a contrast adjustment device and method of a liquid crystal display, and particularly relates to a contrast adjustment device and method capable of correcting the contrast value at any time according to the brightness change of the surrounding environment of the liquid crystal display.

Background technique

The rapid progress of the multimedia society is mostly due to the rapid progress of semiconductor devices or display devices. As far as displays are concerned, thin film transistor liquid crystal displays (Thin Film Transistor Liquid Crystal Display, referred to as TFT-LCD) with superior characteristics such as high image quality, good space utilization efficiency, low power consumption, and no radiation have gradually become the mainstream of the market.

As far as technical personnel engaged in TFT-LCD related fields are concerned, when defining the luminance curve of TFT-LCD, they are all completed in a darkroom (darkroom) environment, so as to correct the display screen presented by TFT-LCD Brightness and contrast ratio, so that the user's eyes feel the most comfortable to watch the display screen presented by TFT-LCD.

It is worth mentioning here that the above brightness curve is actually brightness contrast, which can be defined as the dynamic ratio between black and white. For example, when the brightness contrast of TFT-LCD is 1020, according to the above definition, it can be deduced that the dynamic ratio between black and white is 1020, that is to say: if the value of black is defined as 1, the value of white is 1020.

However, because when defining the brightness curve of TFT-LCD, its brightness contrast is fixed, so when the TFT-LCD is in a very dark surrounding environment, the user's eyes will feel quite dazzling at this time, but When the TFT-LCD is in a bright environment, the above-mentioned fixed brightness contrast may be insufficient, and the user may feel that the display screen presented by the TFT-LCD is foggy, gray, and a little unclear, so that It is quite uncomfortable for the user's eyes to see this picture.

Contents of the invention

In view of this, the purpose of the present invention is to provide a contrast adjustment device and method thereof, which can modify the contrast value required to define the contrast of the video signal according to the brightness change of the surrounding environment of the liquid crystal display.

Another object of the present invention is to provide a liquid crystal display. By applying the contrast adjustment device and method proposed by the present invention to it, the liquid crystal display can correct its brightness at any time according to the brightness change of its surrounding environment. Contrast value to present the most comfortable display screen brightness for users to watch.

Based on the above and other objectives, the contrast adjustment device provided by the present invention includes an ambient light processing unit, a contrast correction processor, and a system central processing unit. Wherein, the ambient light processing unit outputs a brightness signal according to the brightness change of the surrounding environment of the contrast adjustment device. The contrast correction processor corrects the contrast value output by the ambient light processing unit according to the brightness signal output by the ambient light processing unit. The system CPU defines the brightness contrast of the video signal received by the system CPU according to the contrast value corrected by the contrast correction processor.

From another point of view, the liquid crystal display provided by the present invention includes a contrast adjustment device and a liquid crystal display panel. Wherein, the contrast adjustment device will modify the contrast value required to define the brightness contrast of the video signal according to the brightness change of the surrounding environment of the liquid crystal display. The liquid crystal display panel displays the image of the video signal according to the brightness contrast of the video signal.

Still from another point of view, the contrast adjustment method provided by the present invention is suitable for liquid crystal displays, which includes the following steps: firstly, detecting the brightness change of the surrounding environment of the liquid crystal display. Then, the contrast value required to define the brightness contrast of the video signal is corrected according to the brightness variation of the surrounding environment of the liquid crystal display.

The contrast adjustment device and method thereof provided by the present invention can be applied to current liquid crystal displays, because the contrast adjustment device and method thereof provided by the present invention modify the contrast value at any time according to the brightness change of the surrounding environment of the liquid crystal display, In order to make the liquid crystal display present the most comfortable display screen brightness for users to watch.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments of the present invention will be exemplified below and described in detail with accompanying drawings.

Description of drawings

FIG. 1 is a block diagram of a liquid crystal display according to a preferred embodiment of the present invention.

FIG. 2 is a flowchart of a contrast adjustment method according to a preferred embodiment of the present invention.

Detailed ways

The technical effect that the present invention intends to achieve is to solve the problem of the brightness of the displayed picture when the existing TFT-LCD is in a bright or very dark environment because its brightness contrast (brightness contrast) is fixed. It will cause uncomfortable shortcomings when viewed by human eyes, and the following content will be a detailed description of the technical features and desired effects of this case, so as to provide reference for those skilled in the art related to the invention.

FIG. 1 is a block diagram of a liquid crystal display according to a preferred embodiment of the present invention. Referring to FIG. 1 , a liquid crystal display (such as a thin film transistor liquid crystal display, TFT-LCD) 100 includes a contrast adjustment device 101 , a video signal generator 103 , and a liquid crystal display panel 105 . Wherein, the contrast adjustment device 101 modifies the contrast value required to define the brightness contrast of the video signal VS provided by the video signal generator 103 according to the change of the brightness LS_int of the surrounding environment of the liquid crystal display 100 . The liquid crystal display panel 103 will display the image of the video signal for the user to watch according to the brightness contrast of the video signal VS.

In this embodiment, the contrast adjustment device 101 includes an ambient light processing unit 101a, a contrast correction processor 101b, and a system central controller 101c. Wherein, the ambient light processing unit 101 a is composed of a light sensor (light sensor) 107 and an optical amplification processor 109 . First, the light sensor 107 senses the change of the brightness LS_int of the surrounding environment of the liquid crystal display 100 , and outputs a light sensing signal LSS accordingly. Next, the optical amplifier processor 109 amplifies the light sensing signal LSS output by the light sensor 107 by a gain value (the gain value should depend on the actual situation), and performs noise filtering and distortion compensation on it Outputting an brightness signal IS to the contrast correction processor 101b.

Afterwards, when the contrast correction processor 101b receives the luminance signal IS, its built-in lookup table (lookup table, not shown) will find an environment contrast value correspondingly according to the luminance signal IS for contrast correction processing The device 101b modifies the output comparison value accordingly. In this way, the system central controller 101c (for example, a video signal IC) defines the brightness contrast value of the video signal VS provided to it by the video signal generator 103 according to the contrast value corrected by the contrast correction processor 101b, thus The defined brightness contrast value of the video signal VS is then used to display the video signal picture for the user to watch through the liquid crystal display panel 105 .

It is well known that the above-mentioned so-called brightness contrast can be defined as the dynamic ratio between black and white. For example, when the brightness contrast ratio of the display screen presented by the liquid crystal display 100 is 500, according to the above definition, it can be deduced that the dynamic ratio between black and white is 1:500. It is worth mentioning that the contrast adjusting device 101 of this embodiment can not only correct the value of white, but also correct the value of black. For example, when the contrast adjusting device 101 of the present invention determines that the contrast is to be corrected from 500 to 1000, the ratio can be adjusted to 1:1000 or 0.5:500. However, in a preferred embodiment, most of them are values for correcting white, but the present invention is not limited thereto. From the above-mentioned embodiments, it can be known that the present invention can correct the brightness contrast of the display screen presented by the liquid crystal display 100 , so that the user feels most comfortable when watching the liquid crystal display 100 .

What is worth mentioning here is that the look-up table built in the contrast correction processor 101b can be used to define the range of lumens (lumen) in which the brightness LS_int of the surrounding environment of the liquid crystal display 100 changes through an experimental process. The corresponding environment contrast value is obtained, so as to make the brightness of the display picture presented by the liquid crystal display 100 most comfortable for the eyes.

Fig. 2 is a contrast adjustment method according to a preferred embodiment of the present invention, this method is suitable for liquid crystal display, and it comprises the following steps: first, as described in step S201, provide light sensor (light sensor) to detect liquid crystal display around The brightness of the environment changes. Next, as described in step S203 , an environment contrast value is correspondingly found in the lookup table according to the brightness change of the surrounding environment of the liquid crystal display. Finally, as described in step S205, the contrast value required to define the brightness contrast of the video signal is corrected according to the environment contrast value.

According to the above-mentioned steps, the simpler statement is: the liquid crystal display will modify the contrast value (contrast value) required to define the brightness contrast of the video signal at any time according to the brightness change of the surrounding environment at any time, so as long as the brightness change of the surrounding environment is used , and the concept of modifying the contrast value required to define the brightness contrast of the video signal falls within the scope of protection of the present invention.

To sum up, the contrast adjustment device and method provided by the present invention are applicable to current liquid crystal displays, so according to the spirit described in the above embodiments, the following advantages will be described:

Because the ambient light processing unit senses the brightness change of the surrounding environment of the liquid crystal display, and corrects the contrast value output by the contrast correction processor at any time, no matter whether the liquid crystal display is in a bright environment or a dark room, the brightness of the display screen it presents will be the same. Makes the eyes feel the most comfortable.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Anyone skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be defined by the claims.

Claims (13)

1. contrast adjusting gear comprises:

One surround lighting processing unit is exported a luminance signal according to the brightness variation of this contrast engagement positions context;

One contrast correction processor is electrically coupled to this surround lighting processing unit, revises the correlative value that this contrast correction processor is exported according to this luminance signal; And

One system central processor is electrically coupled to this contrast correction processor, defines the luminance contrast of the vision signal that this system central processor receives according to this correlative value.

2. contrast adjusting gear as claimed in claim 1 is characterized in that, this surround lighting processing unit comprises:

One OPTICAL SENSORS is exported a light sensing signal according to this in order to this brightness variation of sensing; And

One light amplification processor is electrically coupled to this OPTICAL SENSORS, in order to this light sensing signal is amplified a yield value, and it is done this luminance signal of output behind noise filtering and the distortion compensation.

3. contrast adjusting gear as claimed in claim 1, it is characterized in that, the built-in look-up table of this contrast correction processor, this look-up table are corresponding according to this luminance signal finds out an environment correlative value, revises this correlative value of being exported according to this for this contrast correction processor.

4. contrast adjusting gear as claimed in claim 1 is characterized in that, this system's central controller comprises a vision signal IC.

5. LCD comprises:

One contrast adjusting gear according to the brightness variation of this LCD context, and is revised the required correlative value of luminance contrast that defines a vision signal; And

Display panels is electrically coupled to this contrast adjusting gear, shows a vision signal picture according to the luminance contrast of this vision signal.

6. LCD as claimed in claim 5 is characterized in that, this contrast adjusting gear comprises:

One surround lighting processing unit is exported a luminance signal according to this brightness variation of this contrast engagement positions context;

One contrast correction processor is electrically coupled to this surround lighting processing unit, revises the correlative value that this contrast correction processor is exported according to this luminance signal; And

One system central processor is electrically coupled to this contrast correction processor, defines the luminance contrast of the vision signal that this system central processor receives according to this correlative value.

7. LCD as claimed in claim 6 is characterized in that, also comprises a video signal generator, is electrically coupled to this system's central controller, in order to this vision signal to be provided.

8. LCD as claimed in claim 6 is characterized in that, this surround lighting processing unit comprises:

One OPTICAL SENSORS is exported a light sensing signal according to this in order to this brightness variation of sensing; And

One light amplification processor is electrically coupled to this OPTICAL SENSORS, in order to this light sensing signal is amplified a yield value, and it is done this luminance signal of output behind noise filtering and the distortion compensation.

9. LCD as claimed in claim 6, it is characterized in that, the built-in look-up table of this contrast correction processor, this look-up table are corresponding according to this luminance signal finds out an environment correlative value, revises this correlative value of being exported according to this for this contrast correction processor.

10. LCD as claimed in claim 6 is characterized in that, this system's central controller comprises a vision signal IC.

11. a contrast method of adjustment, this method is applicable to a LCD, comprises the following steps:

Detecting the brightness of one of this LCD context changes; And

Change and the required correlative value of luminance contrast of correction definition one vision signal according to this brightness.

12. contrast method of adjustment as claimed in claim 11 is characterized in that, also comprises the following steps: in the step that this brightness of detecting this LCD context changes

Provide an OPTICAL SENSORS to change with this brightness of sensing.

13. contrast method of adjustment as claimed in claim 11 is characterized in that, also comprises the following steps: in the step of this required correlative value of the luminance contrast of revising this vision signal of definition according to this luminance signal

Correspondence is found out an environment correlative value in a look-up table according to this brightness variation; And

Revise this required correlative value of luminance contrast of this vision signal of definition according to this environment correlative value.

Images