Backlight source and driving method thereof

Abstract

The invention discloses a backlight source and a driving method thereof. The backlight source comprises a light-emitting area and further comprises a plurality of light-emitting units, and the light-emitting units are arranged in the light-emitting area and arranged in an array mode. A plurality of first light sensing units, the plurality of first light sensing units are arranged around the light emitting area, and the first light sensing units are used for detecting the external light intensity of the backlight source; the plurality of second light sensing units are arranged in the light emitting area, and the second light sensing units are used for detecting the light emitting intensity of the light emitting units; the processing unit is electrically connected with the first light sensing unit, the second light sensing unit and the light emitting unit, and the processing unit is used for determining the external light intensity corresponding to the light emitting unit according to the light intensity detected by the first light sensing unit and determining the driving current of the light emitting unit based on the external light intensity and the light emitting light intensity. The display effect can be improved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a backlight source and a driving method thereof. Background Art

[0002] Backlight sources have important applications in modern display technology. For example, they can provide backlight for liquid crystal display panels, so that the liquid crystal display panels can work normally.

[0003] However, the display panel prepared by the backlight source in the related art will affect the display effect when exposed to local strong light, making it impossible for the user to clearly identify the display content of the part exposed to the strong light, resulting in a problem of poor display effect. Summary of the invention

[0004] The invention provides a backlight source and a driving method thereof to improve display effect.

[0005] According to one aspect of the present invention, there is provided a backlight source, the backlight source comprising a light emitting area, the backlight source further comprising:

[0006] A plurality of light-emitting units, wherein the plurality of light-emitting units are disposed in the light-emitting area and arranged in an array;

[0007] A plurality of first light sensing units, the plurality of first light sensing units are arranged around the light emitting area, and the first light sensing units are used to detect the external light intensity of the backlight source;

[0008] A plurality of second light sensing units, wherein the plurality of second light sensing units are arranged in the light emitting area, and the second light sensing units are used to detect the light intensity of the light emitting units;

[0009] A processing unit is electrically connected to the first photosensitive unit, the second photosensitive unit and the light-emitting unit, and is used to determine the external light intensity corresponding to the light-emitting unit according to the light intensity detected by the first photosensitive unit, and determine the driving current of the light-emitting unit based on the external light intensity and the light intensity.

[0010] Optionally, the first light sensing unit is disposed on a first side and a second side opposite to each other along a column direction, and a third side and a fourth side opposite to each other along a row direction of the light emitting area;

[0011] The processing unit is used to determine the external light intensity corresponding to the light emitting unit according to a first preset formula; the first preset formula is:

[0012] L1(x, y)=a(x, y)*A(x, y)+b(x, y)*B(x, y)+c(x, y)*C(x, y)+d(x, y)*D(x, y);

[0013] Wherein, L1(x, y) is the external light intensity corresponding to the light-emitting unit in the xth row and yth column; A(x, y) is the external light intensity at the position of the light-emitting element in the yth column corresponding to the first side of the light-emitting area; B(x, y) is the external light intensity at the position of the light-emitting element in the yth column corresponding to the second side of the light-emitting area; C(x, y) is the external light intensity at the position of the light-emitting element in the xth row corresponding to the third side of the light-emitting area; D(x, y) is the external light intensity at the position of the light-emitting element in the xth row corresponding to the fourth side of the light-emitting area;

[0014]

[0015] Wherein, X is the total number of rows of the light emitting units, and Y is the total number of columns of the light emitting units.

[0016] Optionally, each row of the light-emitting units is correspondingly provided with two first light-sensing units which are in the same row as the light-emitting units and are respectively located on the third side and the fourth side;

[0017] Each column of the light-emitting units is correspondingly provided with two first light-sensing units which are in the same column as the light-emitting units and are respectively located on the first side and the second side.

[0018] Optionally, the plurality of second light sensing units are arranged in a one-to-one correspondence with the plurality of light emitting units.

[0019] Optionally, the processing unit is used to determine the driving current of the light-emitting unit based on the external light intensity, the luminous light intensity and a preset corresponding relationship, so as to make the visual effects of different light-emitting units uniform.

[0020] Optionally, the processing unit is further used to determine a consumption rate of the light emitting unit according to the light intensity, and compensate a driving current of the light emitting unit based on the consumption rate.

[0021] Optionally, the backlight source further includes a driving unit and a decoding unit;

[0022] The decoding unit is electrically connected to the processing unit, and the decoding unit is used to provide grayscale information to the processing unit;

[0023] The processing unit is electrically connected to the light emitting unit through the driving unit, and the driving unit is used to drive the light emitting unit.

[0024] According to another aspect of the present invention, a backlight source driving method is provided, for driving the backlight source as described above, the backlight source driving method comprising:

[0025] Obtaining the external light intensity and the luminous light intensity corresponding to the light-emitting unit;

[0026] The driving current of the light emitting unit is determined according to the external light intensity of the light emitting unit and the light intensity of the light emitting unit.

[0027] Optionally, determining the driving current of the light emitting unit according to the external light intensity of the light emitting unit and the light intensity of the light emitting unit includes:

[0028] The driving current of the light emitting unit is determined according to the external light intensity of the light emitting unit, the light intensity of the light emitting unit and a preset corresponding relationship, so as to make the visual effects of different light emitting units uniform.

[0029] Optionally, determining the driving current of the light emitting unit according to the external light intensity of the light emitting unit and the light intensity of the light emitting unit includes:

[0030] Determining a driving current of the light emitting unit according to the external light intensity of the light emitting unit, the light intensity of the light emitting unit and the loss compensation coefficient of the light emitting unit;

[0031] Before determining the driving current of the light emitting unit according to the external light intensity of the light emitting unit and the light intensity of the light emitting unit, the method further includes:

[0032] Determining the consumption rate of the light emitting unit according to the light intensity of the light emitting unit and a preset light intensity;

[0033] Determining whether the light emitting unit consumption rate exceeds a preset threshold;

[0034] If the loss rate of the light emitting unit exceeds the preset threshold, the loss compensation coefficient is increased.

[0035] The technical solution of the embodiment of the present invention adopts a backlight source including a light-emitting area, and the backlight source also includes: a plurality of light-emitting units, the plurality of light-emitting units are arranged in the light-emitting area and arranged in an array; a plurality of first light-sensing units, the plurality of first light-sensing units are arranged around the light-emitting area, and the first light-sensing units are used to detect the external light intensity of the backlight source; a plurality of second light-sensing units, the plurality of second light-sensing units are arranged in the light-emitting area, and the second light-sensing units are used to detect the light intensity of the light-emitting units; a processing unit, which is electrically connected to the first light-sensing unit, the second light-sensing unit and the light-emitting unit, and the processing unit is used to determine the external light intensity corresponding to the light-emitting unit according to the light intensity detected by the first light-sensing unit, and determine the driving current of the light-emitting unit based on the external light intensity and the light intensity of the light-emitting unit. The processing unit can adjust the driving current of the light-emitting unit according to the light intensity detected by the first light-sensing unit and the second light-sensing unit, so that the light emission of the light-emitting unit can be adjusted according to the different external ambient light, and then determine the corresponding driving current for different light-emitting units according to the corresponding external light intensity, so that the display panel has a better display effect under local strong light irradiation.

[0036] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A schematic diagram of the structure of a backlight source provided by an embodiment of the present invention;

[0039] Figure 2 A schematic diagram of a circuit structure of a backlight source provided by an embodiment of the present invention;

[0040] Figure 3 A flowchart of a backlight source driving method provided by an embodiment of the present invention;

[0041] Figure 4 A driving flow chart of a backlight source provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0044] Figure 1A schematic diagram of a backlight source according to an embodiment of the present invention is provided. Figure 1 The backlight source includes a light-emitting area AA, and the backlight source also includes: a plurality of light-emitting units 11, a plurality of first light-sensing units 12, a plurality of second light-sensing units 13, and a processing unit (not shown). The plurality of light-emitting units 11 are arranged in the light-emitting area AA and are arranged in an array; the plurality of first light-sensing units 12 are arranged around the light-emitting area AA, and the first light-sensing units 12 are used to detect the external light intensity of the backlight source; the second light-sensing unit 13 is arranged in the light-emitting area AA, and the second light-sensing unit 13 is used to detect the light intensity of the light-emitting unit 11; the processing unit is electrically connected to the first light-sensing unit 12, the second light-sensing unit 13, and the light-emitting unit 11, and the processing unit is used to determine the external light intensity corresponding to the light-emitting unit 11 according to the light intensity detected by the first light-sensing unit 12, and determine the driving current of the light-emitting unit 11 based on the external light intensity and the light intensity.

[0045] Specifically, the backlight source is, for example, a mini LED (mini Light Emitting Diode) backlight source, an OLED (Organic Light Emitting Diode) backlight source, or a Micro LED (Micro Light Emitting Diode) backlight source. The backlight source includes a plurality of light-emitting units 11 arranged in an array along a row direction X and a column direction Y, and each light-emitting unit 11 includes a plurality of light-emitting elements, and the light-emitting elements are the above-mentioned mini LED, OLED or Micro LED. Different light-emitting units 11 can be controlled independently, that is, different light-emitting units 11 can be driven to emit light of different brightness, thereby achieving adjustment of the local brightness of the backlight source.

[0046] A plurality of first photosensitive units 12 surround the light emitting area AA, and the emitted light of the display area AA will not be directly emitted to the first photosensitive unit 12, so the first photosensitive unit 12 can detect the external ambient light of the backlight source. It should be noted that the external ambient light detected by the first photosensitive unit 12 is the ambient light incident on the light emitting surface of the display panel, that is, the ambient light incident on the light emitting surface of the backlight source. Therefore, the light sensitive surface of the first photosensitive unit 12 is oriented in the same direction as the light emitting surface of the backlight source. In addition, in the present embodiment, the first photosensitive unit 12 is not arranged inside the light emitting area AA, which can not only prevent the first photosensitive unit 12 from being affected by the emitted light of the light emitting unit 11, but also prevent the first photosensitive unit 12 from affecting the uniformity of the light emitted by the backlight source.

[0047] A plurality of second light sensing units 13 are arranged in the light emitting area AA, and can be used to detect the light intensity of each light emitting unit 11 in the backlight source. At the same time, the second light sensing units 13 are arranged in the light emitting area, which can reduce the influence of the external ambient light on the second light sensing units 13, so that the light intensity detected by the second light sensing units 13 mainly comes from the emitted light of the light emitting unit 11 in the backlight source. Preferably, the second light sensing units 13 can be arranged inside the backlight source, and can be arranged on the same layer as the light emitting unit 11.

[0048] The processing unit receives the external light intensity detected by all the first light sensing units 12, and can calculate the corresponding external light intensity at the position of the corresponding light emitting unit 11 according to the light intensity detected by the corresponding multiple first light sensing units 12, and the specific calculation method will be described later. The processing unit can also determine the light intensity of the corresponding light emitting unit 11 according to the light intensity detected by one or more second light sensing units 13. In other words, the processing unit can determine the light intensity of each light emitting unit 11 and the external light intensity received according to the light intensity detected by the first light sensing unit 12 and the second light sensing unit 13. And the driving current of the light emitting unit 11 in the next frame can be determined according to the light intensity and the external light intensity, and the specific determination method will be described later, so that the light emission of the light emitting unit 11 will be adjusted according to the different external ambient light, and then the corresponding driving current is determined according to the corresponding external light intensity for different light emitting units 11, so that the display panel has a better display effect under local strong light irradiation. In addition, compared with the solution of improving the overall backlight brightness, this embodiment can adjust each light-emitting unit, which can improve the display effect without reducing the contrast and display uniformity of the display panel, and at the same time will not excessively increase the power consumption of the backlight.

[0049] The technical solution of this embodiment adopts a backlight source including a light-emitting area, and the backlight source also includes: a plurality of light-emitting units, the plurality of light-emitting units are arranged in the light-emitting area and arranged in an array; a plurality of first light-sensing units, the plurality of first light-sensing units are arranged around the light-emitting area, and the first light-sensing units are used to detect the external light intensity of the backlight source; a plurality of second light-sensing units, the plurality of second light-sensing units are arranged in the light-emitting area, and the second light-sensing units are used to detect the light intensity of the light-emitting units; a processing unit, which is electrically connected to the first light-sensing unit, the second light-sensing unit and the light-emitting unit, and the processing unit is used to determine the external light intensity corresponding to the light-emitting unit according to the light intensity detected by the first light-sensing unit, and determine the driving current of the light-emitting unit based on the external light intensity and the light intensity of the light-emitting unit. The processing unit can adjust the driving current of the light-emitting unit according to the light intensity detected by the first light-sensing unit and the second light-sensing unit, so that the light emission of the light-emitting unit will be adjusted according to the different external ambient light, and then determine the corresponding driving current for different light-emitting units according to the corresponding external light intensity, so that the display panel has a better display effect under local strong light irradiation.

[0050] Optionally, in the above embodiment, the first light sensing unit 12 can be implemented by a light sensing element such as a photodiode. The second light sensing unit 13 can also be implemented by a light sensing element such as a photodiode. The first light sensing unit 12 and the second light sensing unit 13 can use the same or different light sensing elements.

[0051] Optionally, the backlight source further includes a border area NAA surrounding the light emitting area AA, and the first light sensing unit 12 is disposed in the border area NAA.

[0052] Optionally, continue to refer to Figure 1 The light-emitting area AA includes a first side and a second side opposite to each other along the column direction Y, and a third side and a fourth side opposite to each other along the row direction, each of which is provided with a first light sensing unit 12; the processing unit is used to determine the external light intensity corresponding to the light-emitting unit 11 according to a first preset formula; the first preset formula is L1(x, y)=a(x, y)*A(x, y)+b(x, y)*B(x, y)+c(x, y)*C(x, y)+d(x, y)*D(x, y);

[0053] Wherein, L1(x, y) is the external light intensity corresponding to the light-emitting unit in the xth row and yth column; A(x, y) is the external light intensity at the position of the light-emitting element in the yth column corresponding to the first side of the light-emitting area; B(x, y) is the external light intensity at the position of the light-emitting element in the yth column corresponding to the second side of the light-emitting area; C(x, y) is the external light intensity at the position of the light-emitting element in the xth row corresponding to the third side of the light-emitting area; D(x, y) is the external light intensity at the position of the light-emitting element in the xth row corresponding to the fourth side of the light-emitting area;

[0054]

[0055] Wherein, X is the total number of rows of light-emitting units, and Y is the total number of columns of light-emitting units.

[0056] Specifically, in the present embodiment, the first photosensitive unit 12 located on the same side of the light-emitting area AA can be arranged on the same straight line. A(x, y) can be understood as the light intensity of the external ambient light irradiated on the first side of the light-emitting area AA and located in the same column as the y-th column (defined as the first reference position), B(x, y) can be understood as the light intensity of the external ambient light irradiated on the second side of the light-emitting area AA and located in the same column as the y-th column (defined as the second reference position), C(x, y) can be understood as the light intensity irradiated on the third side of the light-emitting area AA and located in the same row as the x-th row (defined as the third reference position), and D(x, y) can be understood as the light intensity irradiated on the fourth side of the light-emitting area AA and located in the same row as the x-th row (defined as the fourth reference position). That is to say, the intersection of the line connecting the first reference position and the second reference position, and the line connecting the third reference position and the fourth reference position is the x-th row and the fourth reference position. yThe position of the column light-emitting unit 11. The first reference position and the second reference position corresponding to different light-emitting units 12 are different, or the third reference position and the fourth reference position corresponding to different light-emitting units 12 are different. The external light intensity at the position of the light-emitting unit 11 has a corresponding relationship with the light intensity of the first reference position, the second reference position, the third reference position and the fourth reference position. Among them, the closer the reference position is to the light-emitting unit, the smaller the difference in light intensity with the position of the light-emitting unit, so the corresponding weighting coefficient can be set to be larger; and the farther the reference position is from the light-emitting unit, the greater the difference in light intensity with the position of the light-emitting unit, so the corresponding weighting coefficient can be set to be smaller. Among them, the weighting coefficients are also a(x, y), b(x, y), c(x, y) and d(x, y) described in this embodiment. And due to the nature of light scattering, it can be approximated that the light intensity at the desired position is inversely proportional to the distance from the reference position. In addition, since the weighted sum of the light intensity corresponding to the first reference position and the second reference position is approximately twice the light intensity in the column direction of the light-emitting unit, and similarly, the weighted sum of the light intensity corresponding to the third reference position and the fourth reference position is approximately twice the light intensity in the row direction of the light-emitting unit, the coefficient of 1 / 2 can be incorporated into the weighted coefficient. Finally, the above-mentioned weighted coefficients are obtained, so that the calculated light intensity at the position of the light-emitting unit is closer to the actual external light intensity of the light-emitting unit. It should be noted that in this embodiment, the external light intensity at the position of the light-emitting unit 11 is decomposed into the superposition of the light intensity in the column direction and the light intensity in the row direction only for the convenience of calculation.

[0057] In the solution of this embodiment, the external light intensity corresponding to the light emitting unit 11 can be calculated by the light intensity detected by the first light sensing unit 12 outside the light emitting area AA. And the light intensity calculated by the calculation method of this embodiment is closer to the actual external light intensity at the position of the light emitting unit 11.

[0058] Optionally, in the above embodiment, the light intensity at each reference position can be calculated using the light intensity of one or more first light sensing units 12 adjacent to the reference position. If no first light sensing unit 12 is provided at the reference position, the light intensity of two first light sensing units 12 located on both sides of the reference position can be used, and each of them is multiplied by a weighting coefficient and then summed up. The weighting coefficient is inversely proportional to the distance from the reference position, and the sum of the two weighting coefficients is 1.

[0059] Of course, in some other embodiments, other methods may be used to calculate the light intensity at the light emitting unit position, such as using different reference positions and different weighting coefficients, etc. Alternatively, more reference positions may be used to calculate the external light intensity at the light emitting unit position, which is not specifically limited in this embodiment.

[0060] Optionally, continue to refer to Figure 1Each row of light-emitting units 11 is correspondingly provided with two first light-sensing units 12 that are in the same row as the light-emitting units 11 and are respectively located on the third side and the fourth side; each column of light-emitting units 11 is correspondingly provided with two first light-sensing units 12 that are in the same column as the light-emitting units 11 and are respectively located on the first side and the second side.

[0061] Specifically, in the present embodiment, first photosensitive units 12 are disposed on opposite sides of each row of light-emitting units 11, and first photosensitive units 12 are disposed on opposite sides of each column of light-emitting units 11. Therefore, the light intensity at the first reference position may be the light intensity detected by the first photosensitive unit 12 in the same column as the light-emitting unit and located on the first side. The light intensity at the second reference position may be the light intensity detected by the first photosensitive unit 12 in the same column as the light-emitting unit and located on the second side. The light intensity at the third reference position may be the light intensity detected by the first photosensitive unit 12 in the same column as the light-emitting unit and located on the third side. The light intensity at the fourth reference position may be the light intensity detected by the first photosensitive unit 12 in the same column as the light-emitting unit and located on the fourth side. And in order to make the light intensity at the reference position more accurate, the light intensity corresponding to the reference position may be set to be the average of the light intensities of the first photosensitive unit 12 at the reference position and the two first photosensitive units 12 located on both sides of the first photosensitive unit 12.

[0062] Optionally, continue to refer to Figure 1 The plurality of second light sensing units 13 are arranged in one-to-one correspondence with the plurality of light emitting units 11 .

[0063] Specifically, each light emitting unit 11 includes a plurality of light emitting elements, and the second light sensing unit 13 may be disposed at the center of the light emitting unit 11 , so that the light intensity detected by the second light sensing unit 13 is closer to the light intensity emitted by the second light sensing unit 13 .

[0064] Optionally, the processing unit is used to determine the driving current of the light-emitting unit based on the external light intensity, the luminous light intensity and a preset corresponding relationship, so as to make the visual effects of different light-emitting units 11 uniform.

[0065] Specifically, the external light intensity is, for example, L1, and the luminous light intensity is, for example, L2. The preset corresponding relationship finally outputs F(L1, L2) according to L1 and L2. In some embodiments, under normal circumstances, the driving current corresponding to the light-emitting unit 11 is, for example, I(normal), that is, the driving current corresponding to the light-emitting unit 11 is I(normal) without any compensation. When there is compensation, the actual driving current of the light-emitting unit 11 is I(real)=I(normal)*K, where K is the final compensation coefficient. Then F(L1, L2) can be understood as the light sensitivity compensation coefficient, that is, if only light sensitivity compensation is considered, then I(real)=I(normal)*F(L1, L2). Of course, the backlight source also needs to consider grayscale compensation to compensate for the uneven display of different light-emitting units under the same grayscale, then I(real)=I(normal)*F(L1, L2)*I(grayscale compensation), where the specific determination method of grayscale compensation and I(normal) is well known to those skilled in the art and will not be repeated here. This embodiment only introduces the method for determining light sensitivity compensation.

[0066] Exemplarily, the preset correspondence relationship can be determined by experiment or simulation. For example, L1 and L2 corresponding to some light-emitting units (such as defined as the first light-emitting unit) can be fixed, and at least one of L1 and L2 corresponding to some light-emitting units (such as defined as the second light-emitting unit) can be changed, and then F(L1, L2) is continuously adjusted so that the visual effect of the first light-emitting unit is consistent with the visual effect of the second light-emitting unit, that is, the visual effect of all light-emitting units of the backlight source is uniform. The preset correspondence relationship can be fitted by multiple L1, L2 and F(L1, L2). Of course, the above-mentioned visual effect can be, for example, determined by a computer or by multiple people, and this embodiment does not specifically limit this.

[0067] In this embodiment, by presetting the corresponding relationship, the first light sensing unit and the second light sensing unit are used to compensate the driving currents of different light emitting units, so that different light emitting units can have the same visual effect under different ambient light brightness.

[0068] Optionally, the processing unit is further used to determine a consumption rate of the light emitting unit according to the light intensity, and compensate the driving current of the light emitting unit based on the consumption rate.

[0069] Specifically, in this embodiment, I(actual)=I(normal)*F(L1, L2)*I(grayscale compensation)*I(loss compensation), wherein I(loss compensation) is a compensation value generated due to the loss of the light-emitting unit. Under normal circumstances, that is, when the light-emitting unit is not lost, the value of I(loss compensation) is 1. In this embodiment, the brightness of the light-emitting unit can be calibrated before the backlight source leaves the factory (at this time, the light-emitting unit can be considered to be not lost). For example, the second photosensitive unit 13 is used to detect the brightness corresponding to the light-emitting unit at each grayscale as the preset light intensity corresponding to each grayscale. When the light-emitting unit is working, the processing unit calculates the loss rate using the light intensity of the light-emitting unit detected by the second photosensitive unit 13 and the preset light intensity, and compares whether the loss rate exceeds the preset threshold value. If it exceeds the preset threshold value, it indicates that the loss rate is too high, and the driving current corresponding to the light-emitting unit can be increased; if it does not exceed the preset threshold value, it indicates that the loss rate is low, and the driving current of the light-emitting unit can be maintained unchanged. The preset threshold is, for example, 5%, wherein the consumption rate may be the absolute value of (light intensity of the light emitting unit-preset light intensity) / preset light intensity.

[0070] Of course, it should be noted that the preset light intensity is the preset light intensity corresponding to I (actual), rather than the preset light intensity corresponding to I (normal).

[0071] In this embodiment, the consumption rate of the light emitting unit is taken into consideration in the compensation of the driving current, so that the display unevenness problem caused by the different consumption rates of each light emitting unit can be compensated.

[0072] Optionally, Figure 2 A schematic diagram of a circuit structure of a backlight source provided by an embodiment of the present invention, referring to Figure 2 The backlight source includes a processing unit 21 , a driving unit 22 , a decoding unit 23 and a power supply unit 24 .

[0073] The decoding unit 23 is electrically connected to the processing unit 21, and the decoding unit 23 is used to receive the display signal, and output the decoded display signal to the processing unit 21. The decoded signal includes the above-mentioned I (normal) information. The processing unit 21 receives the light intensity information detected by the first photosensitive unit 12 and the second photosensitive unit 13, and combines it with the decoded signal to generate corresponding F (L1, L2), I (grayscale compensation) and I (loss compensation). Then I (real) is generated through the driving unit 23, and finally the corresponding light-emitting unit is driven to emit light with I (real). The power supply unit 24 can supply power to the decoding unit 23, the processing unit 21 and the driving unit 22.

[0074] In this embodiment, the backlight source can realize automatic compensation, so that the backlight source can realize compensation when the light emitting units have different consumption and the external ambient light where the light emitting units are located is different, that is, the backlight source has a relatively consistent visual effect.

[0075] The present invention also provides a backlight source driving method, which is used to drive the backlight source provided by any embodiment of the present invention, such as Figure 3 As shown, Figure 3 A flowchart of a backlight driving method provided by an embodiment of the present invention, the backlight driving method comprising:

[0076] Step S301, obtaining the external light intensity and the luminous light intensity corresponding to the light-emitting unit.

[0077] Specifically, the external light intensity may be first detected by the first light sensing unit 12, the internal light intensity may be detected by the second light sensing unit 13, and the external light intensity corresponding to each light emitting unit may be calculated by the output of the first light sensing unit 12. The luminous light intensity corresponding to each light emitting unit may be calculated by the output of the second light sensing unit 13. The external light intensity and luminous light intensity corresponding to the light emitting unit may be calculated by the processing unit.

[0078] Step S302, determining the driving current of the light emitting unit according to the external light intensity of the light emitting unit and the light intensity of the light emitting unit.

[0079] Specifically, the processing unit can determine the light intensity of each light-emitting unit 11 and the external light intensity received according to the light intensity detected by the first light-sensing unit 12 and the second light-sensing unit 13. And the driving current of the light-emitting unit 11 in the next frame can be determined according to the light intensity and the external light intensity. The specific determination method will be described later, so that the light emission of the light-emitting unit 11 will be adjusted according to the different external ambient light, and then the corresponding driving current is determined for different light-emitting units 11 according to the corresponding external light intensity, so that the display panel has a better display effect under local strong light irradiation. In addition, compared with the solution of improving the brightness of the backlight source as a whole, this embodiment can be adjusted for each light-emitting unit, which can improve the display effect without reducing the contrast and display uniformity of the display panel, and at the same time will not increase the power consumption of the backlight source too much.

[0080] According to the technical solution of this embodiment, the processing unit can adjust the driving current of the light-emitting unit according to the light intensity detected by the first light-sensitive unit and the second light-sensitive unit, so that the light emission of the light-emitting unit can be adjusted according to the different external ambient light, and then the corresponding driving current is determined for different light-emitting units according to the corresponding external light intensity, so that the display panel has a better display effect even under local strong light irradiation.

[0081] Optionally, determining the driving current of the light emitting unit according to the external light intensity of the light emitting unit and the light intensity of the light emitting unit includes:

[0082] The driving current of the light-emitting unit is determined according to the external light intensity of the light-emitting unit, the light intensity of the light-emitting unit and a preset corresponding relationship, so as to make the visual effects of different light-emitting units uniform.

[0083] Specifically, the specific determination method and effect of the preset corresponding relationship can refer to the description of the backlight source structure of the present invention, which will not be repeated here.

[0084] Optionally, determining the driving current of the light emitting unit according to the external light intensity of the light emitting unit and the light intensity of the light emitting unit includes:

[0085] Determining a driving current of the light emitting unit according to the external light intensity of the light emitting unit, the light intensity of the light emitting unit and the loss compensation coefficient of the light emitting unit;

[0086] Before determining the driving current of the light emitting unit according to the external light intensity of the light emitting unit and the light intensity of the light emitting unit, the method further includes:

[0087] Determining the consumption rate of the light emitting unit according to the light intensity of the light emitting unit and the preset light intensity;

[0088] Determining whether the light emitting unit consumption rate exceeds a preset threshold;

[0089] If the loss rate of the light-emitting unit exceeds a preset threshold, the loss compensation coefficient is increased.

[0090] Specifically, in this embodiment, the loss compensation coefficient is also referred to as I (loss compensation), and the specific judgment method of whether the loss rate of the light-emitting unit exceeds the preset threshold value can refer to the description of the backlight structure part of the present invention. When the loss rate of the light-emitting unit exceeds the preset threshold value, the loss compensation coefficient can be increased in each frame according to the preset gradient. For example, if the incremental gradient is 0.01, if the loss rate of the light-emitting unit exceeds the preset threshold value, in the next frame, the loss coefficient is updated to I (loss compensation) + 0.01.

[0091] For example, Figure 4 As shown, Figure 4A driving flow chart of a backlight source provided by an embodiment of the present invention. The driving process of the backlight source includes: a first photosensitive unit detects external light intensity, and a second photosensitive unit detects luminous light intensity; then the processing unit calculates a light sensitivity compensation coefficient, that is, the processing unit calculates F(L1, L2) according to the external light intensity detected by the first photosensitive unit and the luminous light intensity detected by the second photosensitive unit. And on the other hand, the decoding unit decodes the display information, and the processing unit determines the grayscale compensation coefficient I (grayscale compensation) according to the display information. Then the processing unit determines the first coefficient K1 by combining the light sensitivity compensation coefficient and the grayscale compensation coefficient, wherein K1=F(L1, L2)*I(grayscale compensation). On the other hand, the processing unit determines the loss rate according to the luminous unit and the preset light intensity, and then determines whether the loss rate exceeds the preset threshold. If so, it increases the current loss compensation coefficient and determines I(real), (wherein the initial value of the loss compensation coefficient is 1 and is continuously updated during the driving process). If the loss rate does not exceed the preset threshold, the current loss compensation coefficient is used to determine I(real). Wherein I(real)=K1*I(loss compensation). After I(real) is determined, the driving unit generates a corresponding driving current according to I(real), thereby causing the backlight source to emit light.

[0092] It should be noted that the first light sensing unit can also be implemented in other forms as long as it can collect the external ambient light of the corresponding light emitting unit. The first light sensing unit can be as described above, or can be integrated on the glass or other places.

[0093] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps described in the present invention can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solution of the present invention can be achieved, and this document does not limit this.

[0094] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A backlight source, characterized in that: The backlight source includes a light emitting area, and the backlight source further includes: A plurality of light-emitting units, wherein the plurality of light-emitting units are disposed in the light-emitting area and arranged in an array; A plurality of first light sensing units, the plurality of first light sensing units are arranged around the light emitting area, and the first light sensing units are used to detect the external light intensity of the backlight source; A plurality of second light sensing units, wherein the plurality of second light sensing units are arranged in the light emitting area, and the second light sensing units are used to detect the light intensity of the light emitting units; A processing unit is electrically connected to the first photosensitive unit, the second photosensitive unit and the light-emitting unit, and is used to determine the external light intensity corresponding to the light-emitting unit according to the light intensity detected by the first photosensitive unit, and determine the driving current of the light-emitting unit based on the external light intensity and the light intensity.

2. The backlight source according to claim 1, characterized in that: The first light sensing unit is disposed on a first side and a second side opposite to each other in the column direction, and a third side and a fourth side opposite to each other in the row direction of the light emitting area; The processing unit is used to determine the external light intensity corresponding to the light emitting unit according to a first preset formula; the first preset formula is: L1(x,y)=a(x,y)*A(x,y)+b(x,y)*B(x,y)+c(x,y)* C(x,y)+d(x,y)*D(x,y); Wherein, L1(x, y) is the external light intensity corresponding to the light-emitting unit in the xth row and yth column; A(x, y) is the external light intensity at the position of the light-emitting element in the yth column corresponding to the first side of the light-emitting area; B(x, y) is the external light intensity at the position of the light-emitting element in the yth column corresponding to the second side of the light-emitting area; C(x, y) is the external light intensity at the position of the light-emitting element in the xth row corresponding to the third side of the light-emitting area; D(x, y) is the external light intensity at the position of the light-emitting element in the xth row corresponding to the fourth side of the light-emitting area; Wherein, X is the total number of rows of the light emitting units, and Y is the total number of columns of the light emitting units.

3. The backlight source according to claim 2, characterized in that: Each row of the light-emitting units is correspondingly provided with two first light-sensing units which are in the same row as the light-emitting units and are respectively located on the third side and the fourth side; Each column of the light-emitting units is correspondingly provided with two first light-sensing units which are in the same column as the light-emitting units and are respectively located on the first side and the second side.

4. The backlight source according to claim 1, characterized in that: The plurality of second light sensing units are arranged in one-to-one correspondence with the plurality of light emitting units.

5. The backlight source according to claim 1, characterized in that: The processing unit is used to determine the driving current of the light-emitting unit based on the external light intensity, the luminous light intensity and a preset corresponding relationship, so as to make the visual effects of different light-emitting units uniform.

6. The backlight source according to claim 1, characterized in that: The processing unit is further configured to determine a consumption rate of the light emitting unit according to the light intensity, and compensate a driving current of the light emitting unit based on the consumption rate.

7. The backlight source according to claim 1, characterized in that: The backlight source also includes a driving unit and a decoding unit; The decoding unit is electrically connected to the processing unit, and the decoding unit is used to provide grayscale information to the processing unit; The processing unit is electrically connected to the light emitting unit through the driving unit, and the driving unit is used to drive the light emitting unit.

8. A method for driving a backlight source, used for driving the backlight source according to any one of claims 1 to 7, characterized in that: The driving method of the backlight source comprises: Obtaining the external light intensity and the luminous light intensity corresponding to the light-emitting unit; The driving current of the light emitting unit is determined according to the external light intensity of the light emitting unit and the light intensity of the light emitting unit.

9. The backlight driving method according to claim 8, characterized in that: The step of determining the driving current of the light emitting unit according to the external light intensity of the light emitting unit and the light intensity of the light emitting unit comprises: The driving current of the light emitting unit is determined according to the external light intensity of the light emitting unit, the light intensity of the light emitting unit and a preset corresponding relationship, so as to make the visual effects of different light emitting units uniform.

10. The driving method according to claim 8, characterized in that: The step of determining the driving current of the light emitting unit according to the external light intensity of the light emitting unit and the light intensity of the light emitting unit comprises: Determining a driving current of the light emitting unit according to the external light intensity of the light emitting unit, the light intensity of the light emitting unit and the loss compensation coefficient of the light emitting unit; Before determining the driving current of the light emitting unit according to the external light intensity of the light emitting unit and the light intensity of the light emitting unit, the method further includes: Determining the consumption rate of the light emitting unit according to the light intensity of the light emitting unit and a preset light intensity; Determining whether the light emitting unit consumption rate exceeds a preset threshold; If the loss rate of the light emitting unit exceeds the preset threshold, the loss compensation coefficient is increased.

Images