Backlight and driving method thereof

Abstract

The application 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 arranged in an array in the light emitting area; a plurality of first light sensing units arranged around the light emitting area, the first light sensing units being used for detecting external light intensity of the backlight source; a plurality of second light sensing units arranged in the light emitting area, the second light sensing units being used for detecting light emitting intensity of the light emitting units; and a processing unit electrically connected with the first light sensing units, the second light sensing units and the light emitting units, the processing unit being used for determining corresponding external light intensity of the light emitting units according to the light intensity detected by the first light sensing units, and determining driving current of the light emitting units based on the external light intensity and the light emitting intensity. The application can improve display effect.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of display technology, and in particular, to a backlight and a driving method thereof. BACKGROUND

[0002] The backlight has an important application in modern display technology, such as providing backlight for a liquid crystal display panel, so that the liquid crystal display panel can work normally.

[0003] However, the display panel prepared by the backlight in the related art is affected by the display effect under local strong light irradiation, so that the user cannot clearly distinguish the display content of the part irradiated by the strong light, causing the problem of poor display effect. SUMMARY

[0004] The present application provides a backlight and a driving method thereof to improve the display effect.

[0005] According to an aspect of the present application, a backlight is provided, the backlight comprising a light emitting area, the backlight further comprising:

[0006] a plurality of light emitting units arranged in an array in the light emitting area;

[0007] a plurality of first light sensing units arranged around the light emitting area, the first light sensing units being configured to detect an external light intensity of the backlight;

[0008] a plurality of second light sensing units arranged in the light emitting area, the second light sensing units being configured to detect a light emitting intensity of the light emitting units;

[0009] a processing unit electrically connected to the first light sensing units, the second light sensing units and the light emitting units, the processing unit being configured to determine the external light intensity corresponding to the light emitting units according to the light intensity detected by the first light sensing units, and determine a driving current of the light emitting units based on the external light intensity and the light emitting intensity.

[0010] Optionally, the first light sensing units are arranged on the first side and the second side opposite to each other in the column direction, and on the third side and the fourth side opposite to each other in the row direction.

[0011] The processing unit is configured to determine the external light intensity corresponding to the light emitting units 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] L1(x,y) is the external light intensity corresponding to the xth row and yth column light emitting unit; A(x,y) is the external light intensity corresponding to the yth column light emitting element position on the first side of the light emitting area; B(x,y) is the external light intensity corresponding to the yth column light emitting element position on the second side of the light emitting area; C(x,y) is the external light intensity corresponding to the xth row light emitting element position on the third side of the light emitting area; and D(x,y) is the external light intensity corresponding to the xth row light emitting element position on the fourth side of the light emitting area.

[0014]

[0015] 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 provided with two first light sensing units in the same row as the light emitting units and located at the third side and the fourth side, respectively.

[0017] Each column of the light emitting units is provided with two first light sensing units in the same column as the light emitting units and located at the first side and the second side, respectively.

[0018] Optionally, the plurality of second light sensing units are provided one-to-one with the plurality of light emitting units.

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

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

[0021] Optionally, the backlight source further comprises a driving unit and a decoding unit.

[0022] The decoding unit is electrically connected with the processing unit, and the decoding unit is configured to provide gray scale information to the processing unit.

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

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

[0025] obtaining the external light intensity and the light emitting 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 emitting intensity of the light emitting unit.

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

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

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

[0030] The driving current of the light emitting unit is determined according to the external light intensity of the light emitting unit, the light emitting intensity of the light emitting unit and a loss compensation coefficient of the light emitting unit.

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

[0032] The loss rate of the light emitting unit is determined according to the light emitting intensity of the light emitting unit and a preset light intensity.

[0033] It is determined whether the loss rate of the light emitting unit exceeds a preset threshold value.

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

[0035] The technical scheme of the embodiment of the application adopts a backlight source comprising a light emitting area, and the backlight source further comprises: a plurality of light emitting units arranged in an array in the light emitting area; a plurality of first light sensing units arranged around the light emitting area, the first light sensing units being used for detecting the external light intensity of the backlight source; a plurality of second light sensing units arranged in the light emitting area, the second light sensing units being used for detecting the light emitting intensity of the light emitting units; and a processing unit electrically connected with the first light sensing units, the second light sensing units and the light emitting units, the processing unit being used for determining the corresponding external light intensity of the light emitting units according to the light intensity detected by the first light sensing units, and determining the driving current of the light emitting units based on the external light intensity and the light emitting intensity. The processing unit can adjust the driving current of the light emitting units according to the light intensity detected by the first light sensing units and the second light sensing units, so that the light emitting of the light emitting units is adjusted according to the different external ambient light, and then the corresponding driving current of the light emitting units is determined according to the corresponding external light intensity, so that the display panel has a better display effect under the irradiation of local strong light.

[0036] It is to be understood that the embodiments described herein are merely exemplary of the application and that a person skilled in the art can devise other embodiments without departing from the scope of the present application. It is also to be understood that not all of the benefits described herein need necessarily be realized in any particular embodiment of the application and that various embodiments of the present application can be directed to one or more particular benefits or be directed to no benefits at all. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

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

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

[0040] Figure 3 A flow chart of a driving method of a backlight source provided by an embodiment of the present application;

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

[0042] In order to make the technical personnel in the art better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without any creative effort should be within the scope of the present application.

[0043] It should be noted that the terms "first", "second", and the like in the description and claims of the present application and the above drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to the process, method, product or device.

[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 units 13 are arranged in the light-emitting area AA, and the second light-sensing units 13 are used to detect the light intensity of the light-emitting units 11; the processing unit is electrically connected to the first light-sensing units 12, the second light-sensing units 13, and the light-emitting units 11, and the processing unit is used to determine the external light intensity corresponding to the light-emitting unit 11 based on the light intensity detected by the first light-sensing units 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 the row direction X and the column direction Y. Each light-emitting unit 11 includes a plurality of light-emitting elements, which are the above-mentioned mini LEDs, OLEDs, or Micro LEDs. Different light-emitting units 11 can be controlled independently, that is, by driving different light-emitting units 11 to emit light of different brightness, the local brightness of the backlight source can be adjusted.

[0046] A plurality of first light-sensing units 12 surround the light-emitting area AA, and the light emitted from the display area AA will not be directly emitted onto the first light-sensing unit 12, so the first light-sensing 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 light-sensing 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-sensing surface of the first light-sensing unit 12 is oriented in the same direction as the light-emitting surface of the backlight source. In addition, in this embodiment, the first light-sensing unit 12 is not arranged inside the light-emitting area AA, which not only prevents the first light-sensing unit 12 from being affected by the light emitted by the light-emitting unit 11, but also prevents the first light-sensing unit 12 from affecting the uniformity of the light output of the backlight source.

[0047] The 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. Meanwhile, the second light sensing units 13 are arranged in the light emitting area, which can reduce the influence of external environment 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 light emitted by the light emitting units 11 in the backlight source. Preferably, the second light sensing units 13 can be arranged inside the backlight source, and can be arranged in the same layer as the light emitting units 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 first light sensing units 12, which will be described later. The processing unit can also determine the light emitting 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 emitting intensity and the external light intensity of each light emitting unit 11 according to the light intensity detected by the first light sensing units 12 and the second light sensing units 13. And can determine the driving current of the light emitting unit 11 in the next frame according to the light emitting intensity and the external light intensity, which will be described later. So that the light emitting of the light emitting unit 11 will be adjusted according to the different external environment 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 also has better display effect under the irradiation of local strong light. In addition, compared with the scheme of overall improving the brightness of the backlight source, the present embodiment can adjust each light emitting unit, which can improve the display effect, and will not reduce the contrast and display uniformity of the display panel, and will not increase the power consumption of the backlight source too much.

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

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

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

[0052] Optionally, continuing to refer to Figure 1 The emitting area AA comprises a first side and a second side opposite along the column direction Y, and a third side and a fourth side opposite along the row direction Y, and the first light sensing unit 12 is disposed on each of the first side, the second side, the third side and the fourth side; the processing unit is configured to determine the external light intensity corresponding to the 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 xth row and yth column emitting unit; A(x, y) is the external light intensity corresponding to the yth column emitting element position on the first side of the emitting area; B(x, y) is the external light intensity corresponding to the yth column emitting element position on the second side of the emitting area; C(x, y) is the external light intensity corresponding to the xth row emitting element position on the third side of the emitting area; D(x, y) is the external light intensity corresponding to the xth row emitting element position on the fourth side of the emitting area;

[0054]

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

[0056] Specifically, in the present embodiment, the first light sensing units 12 located on the same side of the emitting area AA can be disposed on the same straight line. A(x, y) can be understood as the light intensity of the external ambient light irradiating on the first side of the emitting area AA and at the position on the same column as the yth column (defined as a first reference position), B(x, y) can be understood as the light intensity of the external ambient light irradiating on the second side of the emitting area AA and at the position on the same column as the yth column (defined as a second reference position), C(x, y) can be understood as the light intensity of the external ambient light irradiating on the third side of the emitting area AA and at the position on the same row as the xth row (defined as a third reference position), and D(x, y) can be understood as the light intensity of the external ambient light irradiating on the fourth side of the emitting area AA and at the position on the same row as the xth row (defined as a fourth reference position). That is, 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 xth row and yth column emitting unit. yThe position of the 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 to the light emitting unit, the smaller the difference between the light intensity at the position of the light emitting unit, and thus the larger the corresponding weighting coefficient can be set; and the farther the reference position from the light emitting unit, the larger the difference between the light intensity at the position of the light emitting unit, and thus the smaller the weighting coefficient can be set. The weighting coefficient is a(x, y), b(x, y), c(x, y) and d(x, y) described in the embodiment. And due to the nature of light scattering, the distance between the light intensity at the position to be solved and the reference position is inversely proportional. In addition, since 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 after weighted summation, and 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 after weighted summation, therefore, the coefficient of 1 / 2 can be combined into the weighting coefficient. Finally, the above-mentioned weighting coefficients are obtained, so that the calculated light intensity at the position of the light emitting unit is closer to the true external light intensity of the light emitting unit. It should be noted that the decomposition of the external light intensity at the position of the light emitting unit 11 into the superposition of the column direction light intensity and the row direction light intensity in the embodiment is only for convenience of calculation.

[0057] The scheme of the embodiment can calculate the external light intensity corresponding to the light emitting unit 11 by detecting the light intensity of the first light sensing unit 12 outside the light emitting area AA. And the light intensity calculated by the calculation method of the embodiment is closer to the true external light intensity at the position of the light emitting unit 11.

[0058] Optionally, in the above-mentioned embodiments, for the light intensity at each reference position, the light intensity of one or more first light sensing units 12 adjacent to the reference position can be used for calculation. If no first light sensing unit 12 is arranged at the reference position, the light intensity of the two first light sensing units 12 located on both sides of the reference position can be used, and the sum of the light intensity multiplied by the weighting coefficient respectively is obtained. The weighting coefficient is inversely proportional to the distance of the reference position, and the sum of the two weighting coefficients is 1.

[0059] Of course, in other embodiments, other ways can also be used to calculate the light intensity at the position of the light emitting unit, such as using different reference positions and different weighting coefficients. Or, more reference positions are used to calculate the external light intensity at the position of the light emitting unit, which is not limited in the embodiment.

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

[0061] Specifically, in the embodiment, each row of the light emitting units 11 is provided with first light sensing units 12 at the opposite sides, and each column of the light emitting units 11 is provided with first light sensing units 12 at the opposite sides. Therefore, the light intensity at the first reference position can be the light intensity detected by the first light sensing unit 12 which is in the same column as the light emitting unit and is located at the first side. The light intensity at the second reference position can be the light intensity detected by the first light sensing unit 12 which is in the same column as the light emitting unit and is located at the second side. The light intensity at the third reference position can be the light intensity detected by the first light sensing unit 12 which is in the same row as the light emitting unit and is located at the third side. The light intensity at the fourth reference position can be the light intensity detected by the first light sensing unit 12 which is in the same row as the light emitting unit and is located at the fourth side. In order to make the light intensity at the reference position more accurate, the light intensity at the reference position can be the average of the light intensities of the first light sensing unit 12 at the reference position and the two first light sensing units 12 located at the opposite sides of the first light sensing unit 12.

[0062] Optionally, continuing to refer to Figure 1 The plurality of second light sensing units 13 are provided one by one corresponding to 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 can be arranged 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 configured to determine the driving current of the light emitting unit based on the external light intensity, the light emitting light intensity and the preset corresponding relationship, so that the visual effects of different light emitting units 11 are uniform.

[0065] Specifically, the external light intensity is L1, the emitting light intensity is L2, and the preset corresponding relationship outputs F(L1, L2) according to L1 and L2. In some embodiments, in a normal case, the driving current corresponding to the light emitting unit 11 is I (normal), that is, the driving current corresponding to the light emitting unit 11 without any compensation is I (normal). When there is compensation, the actual driving current of the light emitting unit 11 is I (actual) =I (normal) *K, wherein K is the final compensation coefficient. Then F(L1, L2) can be understood as a light sense compensation coefficient, that is, if only the light sense compensation is considered, I (actual) =I (normal) *F(L1, L2). Of course, the backlight also needs to consider the gray scale compensation to compensate for the display unevenness of different light emitting units at the same gray scale, so I (actual) =I (normal) *F(L1, L2) *I (gray scale compensation), wherein the specific determination method of the gray scale compensation and I (normal) is known to those skilled in the art, and will not be repeated here. The present embodiment only introduces the determination method of the light sense compensation.

[0066] Exemplarily, the preset corresponding relationship can be determined according to experiments or simulation, for example, L1 and L2 corresponding to part of the light emitting units (defined as first light emitting units) can be fixed, and then at least one of L1 and L2 corresponding to part of the light emitting units (defined as second light emitting units) is changed, and F(L1, L2) is adjusted constantly, so that the visual effects of the first light emitting units and the second light emitting units are consistent, that is, the visual effects of all the light emitting units of the backlight are uniform. Through a plurality of L1, L2 and F(L1, L2), the preset corresponding relationship can be fitted. Of course, the above visual effect can be determined by a computer or by multiple people, and the present embodiment does not make specific limitation thereto.

[0067] In the present embodiment, through the preset corresponding relationship, the driving currents of different light emitting units are compensated by the first light sensing unit and the second light sensing unit, so that different light emitting units have the same visual effect under different environmental brightness.

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

[0069] Specifically, in the embodiment, I (real) =I (normal) *F (L1, L2) *I (gray scale compensation) *I (wear compensation), wherein I (wear compensation) is a compensation value due to wear of the light emitting unit. In a normal case, i.e. no wear of the light emitting unit, the value of I (wear compensation) is 1. In the embodiment, the brightness of the light emitting unit can be calibrated before the backlight source is shipped (at this time, the light emitting unit can be considered to have no wear). For example, the brightness of the light emitting unit corresponding to each gray scale is detected by the second light sensing unit 13 as a preset light intensity corresponding to each gray scale. When the light emitting unit is working, the processing unit calculates the wear rate of the light emitting unit by comparing the light intensity of the light emitting unit detected by the second light sensing unit 13 with the preset light intensity, and compares whether the wear rate exceeds a preset threshold. If the wear rate exceeds the preset threshold, it means that the wear rate is too high, and the driving current corresponding to the light emitting unit can be increased. If the wear rate does not exceed the preset threshold, it means that the wear 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 wear rate can be (light intensity of the light emitting unit-preset light intensity) / preset light intensity, and the absolute value is taken.

[0070] Of course, it needs to be explained that the preset light intensity is the preset light intensity corresponding to I (real), not the preset light intensity corresponding to I (normal).

[0071] In the embodiment, the wear rate of the light emitting unit is considered in the compensation of the driving current, and the display unevenness caused by different wear rates of the light emitting units can be compensated.

[0072] Optionally, Figure 2 A circuit structure schematic diagram of a backlight source provided by the embodiment of the present application is shown in FIG. 2. 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 with the processing unit 21, and the decoding unit 23 is used for receiving a display signal and outputting the display signal after decoding to the processing unit 21. The decoded signal contains the I (normal) information described above. The processing unit 21 receives the light intensity information detected by the first light sensing unit 12 and the second light sensing unit 13, and comprehensively processes the decoded signal, so as to generate corresponding F (L1, L2), I (gray scale compensation) and I (wear compensation). Then, I (real) is generated by the driving unit 23, and finally the corresponding light emitting unit is driven to emit light by 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 the embodiment, the backlight source can realize automatic compensation, so that the backlight source can realize compensation and have a relatively consistent visual effect when the light emitting units have different wear and the external ambient light of the light emitting units is different.

[0075] The application further provides a driving method of the backlight source. Figure 3 Figure 3 A flowchart of the driving method of the backlight source is provided in the embodiment of the application. The driving method of the backlight source comprises the following steps.

[0076] In step S301, the external light intensity corresponding to the light emitting unit and the light emitting intensity are obtained.

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

[0078] In step S302, the driving current of the light emitting unit is determined according to the external light intensity of the light emitting unit and the light emitting intensity of the light emitting unit.

[0079] Specifically, the processing unit can determine the light emitting intensity of each light emitting unit 11 and the external light intensity received by the light emitting unit 11 according to the light intensity detected by the first light sensing unit 12 and the second light sensing unit 13. The driving current of the light emitting unit 11 in the next frame can be determined according to the light emitting intensity and the external light intensity. The specific determination method will be described later, so that the light emitting of the light emitting unit 11 can be adjusted according to the different external ambient light. In addition, compared with the scheme of improving the brightness of the backlight source as a whole, the display effect can be improved by adjusting each light emitting unit in the embodiment, without reducing the contrast and display uniformity of the display panel, and without increasing the power consumption of the backlight source too much.

[0080] The technical scheme of the embodiment, 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 emitting of the light emitting unit can be adjusted according to the different external ambient light. In addition, the corresponding driving current of each light emitting unit can be determined according to the corresponding external light intensity, so that the display panel also has a better display effect under the irradiation of local strong light.

[0081] Optionally, the driving current of the light emitting unit is determined according to the external light intensity of the light emitting unit and the light emitting intensity of the light emitting unit.

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

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

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

[0085] determining the driving current of the light emitting unit according to the external light intensity of the light emitting unit, the light emitting 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 emitting intensity of the light emitting unit, the method further comprises:

[0087] determining the loss rate of the light emitting unit according to the light emitting intensity of the light emitting unit and the preset light intensity;

[0088] determining whether the loss rate of the light emitting unit exceeds a preset threshold value;

[0089] if the loss rate of the light emitting unit exceeds the preset threshold value, increasing the loss compensation coefficient.

[0090] Specifically, in the embodiment, the loss compensation coefficient is also referred to as I (loss compensation), and the specific determination 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 application. When the loss rate of the light emitting unit exceeds the preset threshold value, the loss compensation coefficient can be increased by a preset gradient every frame, for example, if the incremental gradient is 0.01, if the loss rate of the light emitting unit exceeds the preset threshold value, the loss coefficient is updated to I (loss compensation) + 0.01 in the next frame.

[0091] Exemplarily, as shown in Figure 4 , the loss compensation coefficient is increased by a preset gradient every frame, for example, if the incremental gradient is 0.01, if the loss rate of the light emitting unit exceeds the preset threshold value, the loss coefficient is updated to I (loss compensation) + 0.01 in the next frame. Figure 4A flow chart of a driving process of a backlight is provided in the embodiments of the present application. The driving process of the backlight comprises: a first light sensing unit detecting external light intensity, a second light sensing unit detecting light emitting intensity; then a processing unit calculating light sensing compensation coefficient, i.e. the processing unit calculates F(L1, L2) according to the external light intensity detected by the first light sensing unit and the light emitting intensity detected by the second light sensing unit. On the other hand, a decoding unit decodes display information, and the processing unit determines gray scale compensation coefficient I(gray scale compensation) according to the display information. Then the processing unit determines the first coefficient K1 by synthesizing the light sensing compensation coefficient and the gray scale compensation coefficient, wherein K1=F(L1, L2)*I(gray scale compensation). On the other hand, the processing unit determines the loss rate according to the light emitting unit and the preset light intensity, and then determines whether the loss rate exceeds the preset threshold. If yes, the current loss compensation coefficient is increased and then I(real) is determined based on the increased loss compensation coefficient (wherein the initial value of the loss compensation coefficient is 1, and the loss compensation coefficient is updated during the driving process). If the loss rate does not exceed the preset threshold, I(real) is determined by using the current loss compensation coefficient, wherein I(real)=K1*I(loss compensation). After I(real) is determined, a driving unit generates corresponding driving current according to I(real), and then the backlight emits light.

[0092] In addition, 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 environment light corresponding to the light emitting unit. The first light sensing unit can be as described above, or can be integrated on the glass or other places, etc.

[0093] It should be understood that the various forms of flow shown above can be reordered, added or deleted steps. For example, the steps described in the present application can be executed in parallel, or in sequence, or in different order, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0094] The above detailed description does not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application.

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 being arranged around the light emitting area, the first light sensing units being used to detect external light intensity of the backlight source; a plurality of second light sensing units, the plurality of second light sensing units being arranged in the light emitting area, the second light sensing units being used to detect the light intensity of the light emitting units; a processing unit electrically connected to the first light sensing unit, the second light sensing unit, and the light emitting unit, the processing unit being configured to determine an external light intensity corresponding to the light emitting unit based on the light intensity detected by the first light sensing unit, and to determine a driving current for the light emitting unit based on the external light intensity, the light emitting intensity, and a preset corresponding relationship, so as to provide a uniform visual effect for different light emitting units; the processing unit being further configured to determine a consumption rate of the light emitting unit based on the light emitting intensity, and to compensate for the driving current of the light emitting unit based on the consumption rate; Among them, the calculation formula of the actual driving current I(real) after compensation of the light-emitting unit is: I(real) = I(normal)*F(L1, L2)*I(grayscale compensation)*I(loss compensation); I(normal) is the driving current corresponding to the light-emitting unit without any compensation, I(grayscale compensation) is the compensation value corresponding to the grayscale compensation, I(loss compensation) is the compensation value caused by the loss of the light-emitting unit, L1 is the external light intensity, L2 is the luminous intensity, and F(L1, L2) is the output of L1 and L2 according to the preset corresponding relationship.

2. The backlight source according to claim 1, wherein: The first light sensing units are provided on the first side and the second side opposite to each other in the column direction, and on the third side and the fourth side opposite to each other in the row direction of the light emitting area; The processing unit is configured 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)+b9x,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 x-th row and y-th column; A(x, y) is the external light intensity at the position of the light-emitting element in the y-th 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 y-th 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 x-th 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 x-th 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, wherein: Each row of the light-emitting units is correspondingly provided with two first light-sensing units that 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 that 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, wherein: The plurality of second light sensing units are arranged in a one-to-one correspondence with the plurality of light emitting units.

5. The backlight source according to claim 1, wherein: The backlight source further 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.

6. A method for driving a backlight source, for driving the backlight source according to any one of claims 1 to 5, characterized in that: The backlight driving method includes: Obtaining the external light intensity and the luminous 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.

7. The backlight driving method according to claim 6, wherein: The determining of 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: 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.

8. The driving method according to claim 6, wherein: The determining of 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: 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 a 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 a 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 consumption rate of the light emitting unit exceeds a preset threshold; If the loss rate of the light emitting unit exceeds the preset threshold, the loss compensation coefficient is increased.

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