CN102903337A - Liquid crystal display as well as control method and device thereof - Google Patents

Abstract

The invention discloses a liquid crystal display control method, device and liquid crystal display. Since the display module in the liquid crystal display reduces the brightness of the backlight emitted by the backlight module when displaying a low-brightness picture, the display effect of the picture will not be affected; The display module loads different working currents when displaying pictures with different brightness, so that the brightness of the displayed picture can be determined according to detecting the working current of the display module. Therefore, in the liquid crystal display control method provided by the embodiment of the present invention, the corresponding relationship between the operating current of the display module and the driving current of the backlight module is established in advance according to the above principles, and then, according to the detected operating current of the display module Adjust the driving current of the backlight module to reduce the brightness of the backlight emitted by the backlight module when displaying a low-brightness picture, so as to achieve the effect of reducing the power consumption of the backlight module to save energy while ensuring the display effect.

Description

Liquid crystal display control method, device and liquid crystal display

technical field

The invention relates to the field of display technology, in particular to a control method and device for a liquid crystal display and a liquid crystal display.

Background technique

At present, due to the increasing importance of environmental protection awareness, the demand for energy conservation is also receiving increasing attention. The liquid crystal display commonly used in daily life is a passive light-emitting device, which is composed of a display module, that is, a liquid crystal display screen and a backlight module. Among them, the power consumption of the backlight module accounts for most of the power consumption of the entire liquid crystal display.

And existing liquid crystal display generally has the setting of power saving, after the picture of liquid crystal display stops setting time, its backlight module and timing controller can be closed, but, in order to avoid directly shutting down because of short-term picture stop Display, usually the time for the control to turn off the display is set relatively long, and the effect of saving power is not as good as expected, and the operation of directly turning off the display is not suitable for the situation that the display is displaying pictures.

Therefore, on the premise of ensuring the display effect of the liquid crystal display, how to reduce the power consumption of the backlight module as much as possible to achieve the effect of energy saving and power saving is a technical problem urgently needed to be solved by those skilled in the art.

Contents of the invention

The embodiment of the present invention provides a liquid crystal display control method, device and liquid crystal display, which are used to reduce the power consumption of the backlight module as much as possible on the premise of ensuring the display effect of the liquid crystal display.

A method for controlling a liquid crystal display provided in an embodiment of the present invention includes:

Detect the working current of the display module in the liquid crystal display;

According to the detected operating current of the display module and the pre-established correspondence between the operating current of the display module and the driving current of the backlight module, the driving current of the backlight module in the liquid crystal display is adjusted.

A control device for a liquid crystal display provided in an embodiment of the present invention includes:

The detection module is used to detect the working current of the display module in the liquid crystal display;

The adjustment module is used to adjust the driving current of the backlight module in the liquid crystal display according to the detected working current of the display module and the pre-established correspondence between the working current of the display module and the driving current of the backlight module.

A liquid crystal display provided in an embodiment of the present invention includes the above-mentioned control device for a liquid crystal display provided in an embodiment of the present invention.

The beneficial effects of the embodiments of the present invention include:

The embodiment of the present invention provides a method and device for controlling a liquid crystal display, and a liquid crystal display, since the display module in the liquid crystal display reduces the brightness of the backlight emitted by the backlight module when displaying a low-brightness picture, which does not affect the display effect of the picture ; and the display module will load different working currents when displaying pictures with different brightness, so that the brightness of the displayed picture can be determined according to detecting the working current of the display module. Therefore, in the liquid crystal display control method provided by the embodiment of the present invention, the corresponding relationship between the operating current of the display module and the driving current of the backlight module is established in advance according to the above principles, and then, according to the detected operating current of the display module Adjust the driving current of the backlight module to reduce the brightness of the backlight emitted by the backlight module when displaying a low-brightness picture, so as to achieve the effect of reducing the power consumption of the backlight module to save energy while ensuring the display effect.

Description of drawings

FIG. 1 is a schematic flowchart of a method for controlling a liquid crystal display provided by an embodiment of the present invention;

Fig. 2a and Fig. 2b are schematic diagrams of the principle of the liquid crystal display provided by the embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a control device for a liquid crystal display provided by an embodiment of the present invention.

Detailed ways

The specific implementation manners of the liquid crystal display control method and device and the liquid crystal display provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

The inventor of the present application found that when the liquid crystal display displays a picture, if most areas of the picture are displayed with low brightness, for example, the picture shows a sword with a black background, and the proportion of the sword in the entire display picture is relatively small. , then we can think that the average brightness of the picture is low. At this time, by comparing the display effects of different backlight brightness emitted by the backlight module, it can be seen that the viewer's eyes have no effect on the picture when they perceive the high-brightness backlight and the low-brightness backlight. Therefore, the inventor thinks that when the display module displays such a picture with low average brightness, the brightness of its backlight can be reduced to reduce the power consumption of the backlight module without affecting the display effect.

Moreover, according to the working principle of the liquid crystal display, it can be known that the power consumption of the display module in the normally white mode increases gradually from a high-brightness picture to a low-brightness picture, that is, the operating current of the display module increases gradually, while the normally black mode In the process of the display module of the display mode from a low-brightness picture to a high-brightness picture, its power consumption is gradually increased, that is, the working current of the display module is gradually increased. Here we only take the display module in normally white mode as an example. As shown in Table 1, the test data shown in Table 1 shows that the power consumption is the smallest when the liquid crystal display module displays the highest brightness screen, that is, a white screen, and the power consumption is the lowest when displaying the lowest brightness screen, that is, a black screen. maximum. In this way, we can calculate the power consumption of the display module by detecting the working current of the display module, so as to determine the brightness of the picture currently displayed by the display module.

Table 16-inch liquid crystal display module (LCM) power consumption data

Therefore, according to the above analysis, a method for controlling a liquid crystal display provided by an embodiment of the present invention, as shown in FIG. 1 , specifically includes the following steps:

S101, detecting the working current of the display module in the liquid crystal display;

S102. Adjust the driving current of the backlight module in the liquid crystal display according to the detected working current of the display module and the pre-established correspondence between the working current of the display module and the driving current of the backlight module.

Wherein, the corresponding relationship between the working current of the display module and the driving current of the backlight module is established in advance, which specifically includes the following steps:

First, measure the working current of the display module when displaying pictures with different brightness, and establish the corresponding relationship between the picture brightness and the working current of the display module; When displaying scenes with a small amount, the working current of the display module can be measured when displaying white screens, black screens and some typical screens.

Then, for pictures with different brightness, determine the minimum driving current of the backlight module required by it, and establish the corresponding relationship between the brightness of the picture and the driving current of the backlight module; It is a fixed value, such as 200mA, which can reduce the driving current of the backlight module on the basis of 200mA, and record the maximum amount of reduction of the driving current of the picture with this brightness on the basis of 200mA without affecting the perception of the viewer, and finally A corresponding relationship between different screen luminances and the minimum driving current required by the backlight module is formed. Of course, in order to ensure a better viewing effect, the driving current required by the backlight module corresponding to different screen brightnesses may be the above-mentioned minimum driving current, or a driving current value slightly larger than the minimum driving current, which will not be discussed here. limited.

Finally, according to the corresponding relationship between the screen brightness and the working current of the display module, and the corresponding relationship between the screen brightness and the driving current of the backlight module, the correspondence between the working current of the display module and the driving current of the backlight module is obtained relationship, such as the corresponding relationship table shown in Table 2.

Table 2 shows the correspondence table between the working current of the module and the driving current of the backlight module

Working current 14.32mA 16.10mA 19.82mA 23.00mA 25.82mA drive current 200mA 175mA 150mA 125mA 100mA

During specific implementation, the corresponding relationship between the operating current of the display module and the driving current of the backlight module obtained according to the above process is generally stored in the microprocessor (MCU) of the liquid crystal display for subsequent operation search and call.

Specifically, after detecting the operating current of the display module through hardware, it needs to be converted by the A/D converter, as shown in Figure 2a and Figure 2b, by searching the operating current of the display module and the backlight module The correspondence between the driving currents determines the driving current required by the backlight module, and adjusts the driving current of the backlight module by adjusting the pulse width modulation (PWM) signal input from the driver to the backlight module. Wherein, as shown in FIG. 2a, the A/D converter may be arranged outside the MCU, or inside the MCU as shown in FIG. 2b, which is not limited here.

Further, in order to avoid adjusting the driving current of the backlight module too frequently, in the above control method provided by the embodiment of the present invention, after step S101 detects the operating current of the display module in the liquid crystal display, step S102 adjusts the driving current of the backlight module in the liquid crystal display. Before driving the current, you can also include:

Determine whether the detected operating current of the display module is greater than a preset current value, if yes, adjust the driving current of the backlight module in the liquid crystal display, if not, maintain the original driving current of the backlight module.

Among them, the preset current value will be greater than the working current of the display module when displaying a white screen, and smaller than the working current when displaying a black screen. In actual implementation, it can be set as the average value of the two working currents, which will not be done here. Specific limits.

Based on the same inventive concept, the embodiment of the present invention also provides a liquid crystal display control device and system. Since the problem-solving principle of the device is similar to the aforementioned liquid crystal display control method, the implementation of the device can be referred to in the method. implementation, the repetition will not be repeated.

A control device for a liquid crystal display provided in an embodiment of the present invention, as shown in FIG. 3 , includes:

The detection module 01 is used to detect the working current of the display module in the liquid crystal display;

The adjustment module 02 is configured to adjust the driving current of the backlight module in the liquid crystal display according to the detected working current of the display module and the pre-established correspondence between the working current of the display module and the driving current of the backlight module.

Further, the above-mentioned liquid crystal display provided by the embodiment of the present invention, as shown in FIG. 3 , further includes:

Determination module 03, for determining whether the working current of the display module detected by the detection module 01 is greater than a preset current value, if so, the adjustment module 02 adjusts the drive current of the backlight module in the liquid crystal display, if not, maintains the current of the original backlight module drive current.

Further, the above-mentioned liquid crystal display provided by the embodiment of the present invention, as shown in FIG. 3 , further includes: a storage module 04, configured to store a pre-established correspondence between the working current of the display module and the driving current of the backlight module. The corresponding relationship is obtained through the following methods: respectively measure the working current of the display module when displaying pictures with different brightness, establish the corresponding relationship between the picture brightness and the working current of the display module; determine the required backlight for the picture with different brightness Based on the minimum driving current of the module, establish the corresponding relationship between the brightness of the screen and the driving current of the backlight module; according to the corresponding relationship between the brightness of the screen and the working current of the display module, and the relationship between the brightness of the screen and the driving current of the backlight module The corresponding relationship between the working current of the display module and the driving current of the backlight module is obtained.

Further, the adjustment module 02 is specifically configured to adjust the driving current of the backlight module by adjusting the pulse width modulation PWM signal input by the driver to the backlight module.

An embodiment of the present invention also provides a liquid crystal display, including the above-mentioned liquid crystal display control device provided by the embodiment of the present invention.

Through the above description of the implementation manners, those skilled in the art can clearly understand that the embodiments of the present invention can be implemented by hardware, or by means of software plus a necessary general hardware platform. Based on this understanding, the technical solutions of the embodiments of the present invention can be embodied in the form of software products, which can be stored in a non-volatile storage medium (which can be CD-ROM, U disk, mobile hard disk, etc.), Several instructions are included to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute the methods described in various embodiments of the present invention.

Those skilled in the art can understand that the drawing is only a schematic diagram of a preferred embodiment, and the modules or processes in the drawing are not necessarily necessary for implementing the present invention.

Those skilled in the art can understand that the modules in the device in the embodiment can be distributed in the device in the embodiment according to the description in the embodiment, or can be located in one or more devices different from the embodiment according to corresponding changes. The modules in the above embodiments can be combined into one module, and can also be further split into multiple sub-modules.

The serial numbers of the above embodiments of the present invention are for description only, and do not represent the advantages and disadvantages of the embodiments.

The embodiment of the present invention provides a method and device for controlling a liquid crystal display, and a liquid crystal display, since the display module in the liquid crystal display reduces the brightness of the backlight emitted by the backlight module when displaying a low-brightness picture, which does not affect the display effect of the picture ; and the display module will load different working currents when displaying pictures with different brightness, so that the brightness of the displayed picture can be determined according to detecting the working current of the display module. Therefore, in the liquid crystal display control method provided by the embodiment of the present invention, the corresponding relationship between the operating current of the display module and the driving current of the backlight module is established in advance according to the above principles, and then, according to the detected operating current of the display module Adjust the driving current of the backlight module to reduce the brightness of the backlight emitted by the backlight module when displaying a low-brightness picture, so as to achieve the effect of reducing the power consumption of the backlight module to save energy while ensuring the display effect.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (9)

1. A control method for a liquid crystal display, characterized in that, comprising: Detect the working current of the display module in the liquid crystal display; According to the detected operating current of the display module and the pre-established correspondence between the operating current of the display module and the driving current of the backlight module, the driving current of the backlight module in the liquid crystal display is adjusted. 2. The control method according to claim 1, further comprising: Determine whether the detected operating current of the display module is greater than a preset current value, if yes, adjust the driving current of the backlight module in the liquid crystal display, if not, maintain the original driving current of the backlight module. 3. The control method according to claim 1, wherein the corresponding relationship between the working current of the display module and the driving current of the backlight module is established in advance, specifically comprising: Measure the working current of the display module when displaying pictures with different brightness, and establish the corresponding relationship between the picture brightness and the working current of the display module; For pictures with different brightness, determine the minimum driving current of the backlight module required by it, and establish the corresponding relationship between the brightness of the picture and the driving current of the backlight module; According to the corresponding relationship between the picture brightness and the working current of the display module, and the corresponding relationship between the picture brightness and the driving current of the backlight module, the corresponding relationship between the working current of the display module and the driving current of the backlight module is obtained. 4. The control method according to any one of claims 1-3, wherein adjusting the driving current of the backlight module in the liquid crystal display specifically comprises: By adjusting the pulse width modulation PWM signal input by the driver to the backlight module, the driving current of the backlight module is adjusted. 5. A control device for a liquid crystal display, characterized in that it comprises: The detection module is used to detect the working current of the display module in the liquid crystal display; The adjustment module is used to adjust the driving current of the backlight module in the liquid crystal display according to the detected working current of the display module and the pre-established correspondence between the working current of the display module and the driving current of the backlight module. 6. The control device according to claim 5, further comprising: A determination module, configured to determine whether the operating current of the display module detected by the detection module is greater than a preset current value, if yes, the adjustment module adjusts the driving current of the backlight module in the liquid crystal display, if not, maintain the original backlight The driving current of the module. 7. The control device according to claim 5, further comprising: a storage module, configured to store a pre-established corresponding relationship between the operating current of the display module and the driving current of the backlight module, the corresponding relationship Obtained by the following methods: respectively measure the working current of the display module when displaying pictures with different brightness, establish the corresponding relationship between the picture brightness and the working current of the display module; determine the required backlight module for the picture with different brightness According to the corresponding relationship between the brightness of the screen and the driving current of the display module, and the correspondence between the brightness of the screen and the driving current of the backlight module The corresponding relationship between the working current of the display module and the driving current of the backlight module is obtained. 8. The control device according to any one of claims 5-7, wherein the adjustment module is specifically used to adjust the driving of the backlight module by adjusting the pulse width modulation PWM signal input by the driver to the backlight module. current. 9. A liquid crystal display, characterized by comprising the control device for a liquid crystal display according to any one of claims 5-8.

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