CN104575448B - The backlight adjusting method and device of a kind of display device - Google Patents

Abstract

The present invention is applicable to the field of display technology, and provides a method and device for adjusting the backlight of a display device, including: under each preset illuminance level, respectively obtain the light intensity value measured by the ambient light sensor built in the terminal relative to the illuminance meter The difference multiple of the measured light intensity value; obtain the light intensity value actually measured by the ambient light sensor; The multiple of the difference is used to adjust the brightness of the backlight of the display device. The present invention provides a suitable backlight adjustment scheme for different types of terminal equipment, so as to eliminate the difference between the ambient light intensity measured by the ambient light sensor and the real ambient light intensity, and ensure that the backlight brightness of the display device can be adjusted to a suitable Brightness value, to avoid the display screen is too bright or insufficient brightness, to ensure the display effect.

Description

Method and device for adjusting backlight of display device

technical field

The invention belongs to the field of display technology, in particular to a method and device for adjusting a backlight of a display device.

Background technique

At present, the backlight adjustment of the mobile phone is realized based on the ambient light sensor installed inside the mobile phone. The different ambient light intensity values measured by the ambient light sensor will directly correspond to a light source brightness value, and the mobile phone screen is adjusted according to the light source brightness value. The brightness of the light source, so as to realize the adjustment of the brightness of the mobile phone screen with the change of the ambient light intensity.

However, for different models of mobile phones, the ambient light intensity measured by the ambient light sensor is affected by various factors such as the orientation of the ambient light sensor on the main board of the mobile phone and the light transmittance of the glass covering the ambient light sensor. There is a certain degree of difference with the real ambient light intensity, which may easily cause the backlight brightness of the mobile phone screen to be unable to be adjusted to an appropriate brightness value, causing the mobile phone screen to be too bright or not bright enough, affecting the display effect.

Contents of the invention

The purpose of the embodiments of the present invention is to provide a method and device for adjusting the backlight of a display device, aiming at solving the problem in the prior art that the screen is easily caused to be too bright or not bright enough to affect the display effect.

The embodiment of the present invention is achieved in this way, a method for adjusting the backlight of a display device, comprising:

Under each preset illuminance level, respectively obtain the difference multiple of the light intensity value measured by the built-in ambient light sensor of the terminal relative to the light intensity value measured by the illuminance meter;

Acquiring the light intensity value actually measured by the ambient light sensor;

Adjusting the brightness of the backlight of the display device based on the actually measured light intensity value and the difference multiple corresponding to the preset illuminance level where the light intensity value is located.

Another object of the embodiments of the present invention is to provide a backlight adjustment device for a display device, including:

The first acquisition unit is configured to respectively acquire the difference multiple of the light intensity value measured by the ambient light sensor built in the terminal relative to the light intensity value measured by the illuminance meter under each preset illuminance level;

a second acquiring unit, configured to acquire the light intensity value actually measured by the ambient light sensor;

An adjustment unit, configured to adjust the brightness of the backlight of the display device based on the actually measured light intensity value and the difference multiple corresponding to the preset illuminance level at which the light intensity value is located.

Embodiments of the present invention provide suitable backlight adjustment schemes for different types of terminal equipment, so as to eliminate the difference between the ambient light intensity measured by the ambient light sensor and the real ambient light intensity, and ensure that the backlight brightness of the display device can be adjusted to one Appropriate brightness value can avoid the display screen from being too bright or not bright enough to ensure the display effect.

Description of drawings

FIG. 1 is a flow chart of an implementation of a method for adjusting a backlight of a display device provided by an embodiment of the present invention;

FIG. 2 is a specific implementation flowchart of the backlight adjustment method S103 of the display device provided by the embodiment of the present invention;

FIG. 3 is a specific implementation flowchart of the backlight adjustment method S202 of the display device provided by the embodiment of the present invention;

FIG. 4 is a specific implementation flowchart of the backlight adjustment method S202 of a display device provided by another embodiment of the present invention;

FIG. 5 is a structural block diagram of a backlight adjustment device of a display device provided by an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

In this embodiment, the display device may be located in a terminal device with a display function (such as a mobile phone, a tablet, a notebook computer, etc.), the display device may include a display panel, and optionally, a liquid crystal display ( Liquid Crystal Display (LCD), Organic Light-Emitting Diode (Organic Light-Emitting Diode, OLED) and other forms to configure the display panel.

Fig. 1 shows the implementation process of the method for adjusting the backlight of the display device provided by the embodiment of the present invention, which is described in detail as follows:

In S101 , at each preset illuminance level, the difference multiples of the light intensity value measured by the built-in ambient light sensor of the terminal relative to the light intensity value measured by the illuminance meter are obtained respectively.

Among them, according to the actual design requirements, the technicians can divide the light intensity of different sizes into several preset illuminance levels, for example, according to the value of the light intensity, it can be divided into 0~1, 2~260, 261~1025, 1026 ~8300, 8300+ five illuminance levels, each illuminance level corresponds to a screen brightness value, for example, the screen brightness values corresponding to the above five illuminance levels are 8, 50, 100, 210 and the maximum brightness that the screen can achieve value.

It should be noted that the brightness of the screen is generated by the brightness of the light source of the display device (that is, the brightness of the backlight mentioned in the implementation of the present invention), but due to the existence of factors such as the transmittance of the display panel, the brightness of the screen and the brightness of the backlight are not the same. Equal, and different types of terminal equipment, the screen brightness produced by the same backlight brightness may be different, the maximum backlight brightness is 255, and the maximum screen brightness can far exceed 255.

In this embodiment, the difference multiples corresponding to different preset illumination levels can be obtained in the following ways:

First, set the standard light intensity values under different preset illuminance levels, as shown in Table 1, the first row is the light intensity under different preset illuminance levels measured by a standard illuminance meter (also known as lux meter). Standard light intensity value. Then, under each set standard light intensity value, the built-in ambient light sensor of the terminal device of the same model is used for measurement, and the light intensity value measured by the ambient light sensor is obtained. In order to ensure the accuracy of the measurement, multiple terminal devices of the same model can be used for simultaneous measurement. For example, the data in the second and third rows in Table 1 are measured by two terminal devices of the same model, and the fourth row The data is the average value of the light intensity data measured by the two terminal devices. Finally, divide the data in the first row by the data in the fourth row to get the difference multiples of different standard light intensity values, and you can calculate the difference multiples of the standard light intensity values under the same preset illuminance level By averaging, the difference multiples corresponding to different preset illuminance levels can be obtained.

Table 1

It can be seen from Table 1 that for the same type of terminal equipment, the difference multiples under different ambient lights are different. When the ambient light intensity is less than 30, the actual light intensity value is measured by the ambient light sensor of the mobile phone. When the ambient light intensity is 30-60, the actual light intensity value is 3.5 times the light intensity value measured by the ambient light sensor of the mobile phone. When the ambient light intensity is greater than 60, the actual light intensity value The value is 2.7 times the light intensity value measured by the ambient light sensor of the mobile phone. Through the above operations, the light intensity value measured by the ambient light sensor can be compensated to be close to the actual light intensity value.

In S102, the light intensity value actually measured by the ambient light sensor is acquired.

In S103 , adjusting the brightness of the backlight of the display device based on the actually measured light intensity value and the difference multiple corresponding to the preset illumination level where the light intensity value is located.

Based on the difference multiples under different preset illuminance levels measured by S101, during the actual use of the terminal device, the light intensity value actually measured by the ambient light sensor can be numerically compensated through the corresponding difference multiples. Specifically, as shown in Figure 2, the implementation process of S103 is:

In S201, determine the preset illuminance level at which the actually measured light intensity value is located.

After obtaining the light intensity value actually measured by the ambient light sensor, compare the preset illuminance level with the preset illuminance level to determine the preset illuminance level where the light intensity value is located, so as to extract the difference multiple corresponding to the preset illuminance level .

In S202, the actual measured light intensity value is multiplied by the determined difference multiple corresponding to the preset illumination level to obtain a target brightness value.

In S203, the brightness of the backlight of the display device is adjusted to the target brightness value.

Multiply the light intensity value actually measured by the ambient light sensor by the difference multiple corresponding to the determined preset illuminance level, and the obtained target brightness value is the backlight brightness after numerical compensation. Adjust the backlight brightness of the display device to To the target brightness value, it can ensure that the brightness of the display screen is coordinated with the current ambient light intensity, and the display effect can be guaranteed.

Based on the backlight adjustment solution provided by the above embodiments, when the ambient light changes too fast or is erratic, in order to avoid the resulting backlight flickering, the backlight intensity can also be adjusted as follows:

As an embodiment of the present invention, as shown in FIG. 3, S202 is specifically:

In S301, it is judged according to the determined preset illuminance level whether the actually measured light intensity value has increased by at least one level.

In S302, when the actually measured light intensity value has increased by at least one level, multiply the actually measured light intensity value by the determined difference multiple corresponding to the preset illuminance level to obtain Target brightness value.

In this embodiment, if the currently measured light intensity value has increased by at least one preset illuminance level compared to the previously measured light intensity value, that is, the ambient light changes from weak to strong, then the backlight intensity is adjusted step by step. In the way of changing, the changing speed can be 50/s, that is, changing 50 backlight values per second.

As another embodiment of the present invention, as shown in FIG. 4, S202 is specifically:

In S401, it is judged according to the determined preset illuminance level whether the actually measured light intensity value has decreased by at least two levels.

In S402, when the actual measured light intensity value has decreased by at least two levels, multiplying the actually measured light intensity value by the determined difference multiple corresponding to the preset illumination level, Get the target brightness value.

In this embodiment, if the ambient light changes from strong to weak, in order to conform to the perception habits of the human eye, the backlight intensity will not be changed step by step, but a step-by-step adjustment method will be adopted, that is, if the currently measured light If the intensity value is lower than the previously measured light intensity value by at least two preset illuminance levels, the backlight intensity is adjusted. In order to better conform to the perception habit of the human eye, the change speed may be lower than the change speed of the backlight intensity when the ambient light changes from weak to strong, for example, 4/s, that is, change 4 backlight values per second. For example, the current light intensity is 8300, and the backlight intensity is the highest. If the light intensity is reduced to 5000 at this time, since only one preset illuminance level is reduced, the backlight adjustment will still not be performed until the light intensity is less than 1026, that is, two preset illuminance levels are reduced. level, adjust the backlight.

On the basis of the embodiment shown in FIG. 3 or FIG. 4 , further, in order to make the backlight switch smoothly and prevent the backlight from shaking, the brightness of the backlight of the display device can be adjusted to the desired value after a preset time delay. the target brightness value described above. For example, when the ambient light changes from weak to strong, if the conditions for backlight adjustment are met, delay the backlight adjustment for 1.5 seconds; when the ambient light changes from strong to weak, if the conditions for backlight adjustment are met, delay After 5 seconds, adjust the backlight. Here, when the ambient light changes in different directions, the preset time delay and backlight intensity change speed can be different. When the ambient light changes from weak to strong, the preset time delay and change speed are faster, and the ambient light changes from strong to strong. When weak, the preset time delay and change speed are slow to conform to the perception habits of the human eye.

Embodiments of the present invention provide suitable backlight adjustment schemes for different types of terminal equipment, so as to eliminate the difference between the ambient light intensity measured by the ambient light sensor and the real ambient light intensity, and ensure that the backlight brightness of the display device can be adjusted to one Appropriate brightness value can avoid the display screen from being too bright or not bright enough to ensure the display effect.

Corresponding to the method for adjusting the backlight of the display device described in the above embodiment, FIG. 5 shows a structural block diagram of the backlight adjustment device of the display device provided by the embodiment of the present invention. part.

Referring to Figure 5, the device includes:

The first obtaining unit 51 obtains the difference multiple of the light intensity value measured by the ambient light sensor built in the terminal relative to the light intensity value measured by the illuminance meter under each preset illuminance level.

The second acquiring unit 52 is configured to acquire the light intensity value actually measured by the ambient light sensor.

The adjustment unit 53 is configured to adjust the brightness of the backlight of the display device based on the actually measured light intensity value and the difference multiple corresponding to the preset illuminance level at which the light intensity value is located.

Optionally, the adjustment unit 53 includes:

The determination subunit determines the preset illuminance level at which the actually measured light intensity value is located.

The calculation subunit multiplies the actually measured light intensity value by the determined difference multiple corresponding to the preset illuminance level to obtain a target luminance value.

The adjustment subunit adjusts the brightness of the backlight of the display device to the target brightness value.

Optionally, the calculation subunit is specifically used for:

judging whether the actually measured light intensity value has increased by at least one level according to the determined preset illuminance level;

When the actually measured light intensity value has increased by at least one level, multiply the actually measured light intensity value by the determined difference multiple corresponding to the preset illuminance level to obtain a target brightness value.

Optionally, the calculation subunit is specifically used for:

judging whether the actually measured light intensity value has decreased by at least two levels according to the determined preset illuminance level;

When the actual measured light intensity value has decreased by at least two levels, multiply the actual measured light intensity value by the determined difference multiple corresponding to the preset illumination level to obtain a target brightness value .

Optionally, the adjustment subunit is specifically used for:

After a preset time delay, the brightness of the backlight of the display device is adjusted to the target brightness value.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the protection of the present invention. within range.

Claims (2)

1. A method for adjusting a backlight of a display device, comprising: Under each preset illuminance level, obtain the light intensity value measured by the ambient light sensor built in the terminal, the light intensity value measured by the illuminance meter, and the difference between the light intensity value measured by the illuminance meter and the ambient light sensor The difference multiple of the obtained light intensity value, and generate the difference multiple table corresponding to different preset illuminance levels; Acquiring the light intensity value actually measured by the ambient light sensor; determining the preset illuminance level at which the actually measured light intensity value is located; After obtaining the light intensity value actually measured by the ambient light sensor, compare the preset illuminance level with the preset illuminance level to determine the preset illuminance level where the light intensity value is located, so as to extract the difference multiple corresponding to the preset illuminance level ; multiplying the actually measured light intensity value by the determined difference multiple corresponding to the preset illuminance level to obtain a target brightness value; adjusting the backlight brightness of the display device to the target brightness value; The step of multiplying the actually measured light intensity value by the determined difference multiple corresponding to the preset illuminance level to obtain a target brightness value includes: According to the determined preset illuminance level, it is judged whether the actual measured light intensity value has decreased by at least two levels; when the actually measured light intensity value has decreased by at least two levels, the actual measured light intensity value Multiply the obtained light intensity value by the determined difference multiple corresponding to the preset illuminance level to obtain a target brightness value; after a preset time delay, adjust the brightness of the backlight of the display device at a first rate of change to the target brightness value; According to the determined preset illuminance level, it is judged whether the actually measured light intensity value has increased by at least one level; when the actually measured light intensity value has increased by at least one level, the actually measured light intensity value multiplying the light intensity value by the determined difference multiple corresponding to the preset illumination level to obtain a target brightness value; after a preset time delay, adjust the brightness of the backlight of the display device to the specified the target brightness value; Wherein, the first rate of change is smaller than the second rate of change. 2. A backlight adjustment device for a display device, comprising: The first acquisition unit is configured to respectively acquire the light intensity value measured by the ambient light sensor built in the terminal, the light intensity value measured by the illuminometer, and the difference between the two at each preset illuminance level, and generate different Table of difference multiples corresponding to preset illuminance levels; a second acquiring unit, configured to acquire the light intensity value actually measured by the ambient light sensor; An adjustment unit, configured to adjust the backlight brightness of the display device based on the actually measured light intensity value and the difference multiple corresponding to the preset illuminance level at which the light intensity value is located; A determining subunit, configured to determine the preset illuminance level at which the actually measured light intensity value is located; The calculation subunit and the adjustment subunit are used to multiply the actual measured light intensity value by the determined difference multiple corresponding to the preset illuminance level to obtain a target brightness value; adjusting the brightness of the backlight to the target brightness value; The calculation subunit is used to judge whether the actual measured light intensity value has increased by at least one level according to the determined preset illuminance level; when the actually measured light intensity value has increased by at least one level , multiplying the actually measured light intensity value by the determined difference multiple corresponding to the preset illuminance level to obtain a target luminance value; The adjustment subunit is configured to, after a preset time delay, adjust the backlight brightness of the display device to the target brightness value at a first rate of change; The calculation subunit is also used to judge whether the actual measured light intensity value has decreased by at least two levels according to the determined preset illuminance level; when the actually measured light intensity value has decreased by at least Two levels, multiplying the actual measured light intensity value by the determined difference multiple corresponding to the preset illumination level to obtain a target brightness value; The adjustment subunit is further configured to, after a preset time delay, adjust the brightness of the backlight of the display device to the target brightness value at a second speed of change; Wherein, the first rate of change is smaller than the second rate of change.