Display system and backlight control method thereof

Abstract

The invention provides a display system and a backlight control method thereof. The display system is provided with a backlight module, a light-emitting surface of the backlight module is divided into a plurality of light-emitting areas, and each light-emitting area corresponds to at least one light-emitting unit. The backlight control method includes the steps of: receiving, by a display module of a display system, input image data; performing regional dimming on the backlight module according to the input image data, wherein the light-emitting unit corresponding to each light-emitting region has a regional dimming value; acquiring a brightness peak value of each light-emitting area; determining a compensation brightness peak value of each light-emitting area according to a brightness enhancement comparison table and the brightness peak values corresponding to the light-emitting areas; and using each compensation brightness peak value in each corresponding light-emitting area in the backlight module.

Description

Technical Field

[0001] The present invention relates to a display system and a backlight control method thereof, and in particular to a display system and a backlight control method thereof applied to medical treatment. Background Art

[0002] Endoscopes are increasingly used in the medical field, especially in surgery. The basic structure of an endoscope is that an LED light is set at the front end of the lens to provide lighting, so that doctors can observe and operate in narrow and poorly lit human cavities. However, due to the limited lighting distance, the image obtained by the endoscope usually only has a better lighting effect in the part close to the lens (near view), while the part farther away (distant view) is relatively dim. Such image quality problems will cause difficulties for doctors' diagnosis and operation.

[0003] For the above problem, the existing solution is mainly based on the overall brightness of the picture and then makes adjustments. Specifically, the existing backlight control method increases the overall brightness of the entire image frame to make the darker distant scene appear brighter, which will also cause the originally brighter near scene to be overexposed, which also makes it difficult to interpret.

[0004] Therefore, how to provide a display system and a backlight control method thereof is one of the current important topics. Summary of the invention

[0005] The present invention provides a display system and a backlight control method thereof, which are used to independently control the backlight corresponding to a specific area of ​​an image frame, so as to improve the brightness difference between a near view and a far view in an image.

[0006] To achieve the above-mentioned purpose, the present invention provides a backlight control method for a display system. The display system has a backlight module, and a light-emitting surface of the backlight module is divided into a plurality of light-emitting areas, and each light-emitting area corresponds to at least one light-emitting unit. The backlight control method comprises the following steps: a display module of the display system receives input image data; regional dimming is performed on the backlight module according to the input image data, wherein the light-emitting unit corresponding to each light-emitting area has a regional dimming value; the brightness peak value of each light-emitting area is obtained; the compensation brightness peak value of each light-emitting area is determined according to the brightness enhancement comparison table and the brightness peak values ​​corresponding to these light-emitting areas; and each light-emitting area corresponding to each compensation brightness peak value in the backlight module is used.

[0007] In one embodiment of the present invention, the brightness enhancement comparison table includes compensation brightness peak values ​​corresponding to different brightness peak ranges.

[0008] In one embodiment of the present invention, when the above-mentioned brightness peak is in the range of 10% to 20%, the corresponding compensation brightness peak is 50% to 70%.

[0009] In one embodiment of the present invention, the display screen corresponding to the input image data has at least one bright area and at least one dark area, wherein the bright area is distributed in a ring-shaped bright area, and the dark area is distributed in a central dark area.

[0010] In one embodiment of the present invention, the local dimming procedure includes compensating the local dimming value corresponding to the dark area based on the halo level of the dark area.

[0011] In one embodiment of the present invention, the above-mentioned compensation brightness peak value is calculated by multiplying the brightness peak value by a brightness adjustment ratio.

[0012] In addition, to achieve the above-mentioned purpose, the present invention provides a display system, which includes a display module, a backlight module and a driving unit. The display module is used to receive input image data. The backlight module has a light-emitting surface divided into a plurality of light-emitting areas, and each light-emitting area is provided with at least one light-emitting unit, wherein the light-emitting unit corresponding to each light-emitting area has a regional dimming value. The driving unit is coupled to the display module and the backlight module respectively, and the driving unit performs regional dimming on the backlight module according to the input image data, and uses a plurality of compensation brightness peaks in each light-emitting area corresponding to the backlight module. Each compensation brightness peak is obtained according to a brightness enhancement comparison table and a brightness peak corresponding to each light-emitting area.

[0013] In one embodiment of the present invention, the local dimming value is determined based on the halo level of the dark area.

[0014] As mentioned above, the display system and backlight control method of the present invention adjust the brightness compensation for a specific brightness range through a brightness enhancement comparison table. When applied to a medical endoscope display system, brightness compensation can be performed separately for a darker specific area to facilitate medical staff to interpret the displayed image.

[0015] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the structure of a display system according to a preferred embodiment of the present invention;

[0017] Figure 2 is a schematic structural diagram of a display device according to a preferred embodiment of the present invention;

[0018] Figure 3 A schematic diagram of the layout of the light-emitting units of the backlight module of the present invention;

[0019] Figure 4 is a schematic diagram of the light emitting area of ​​the backlight module of the present invention;

[0020] Figure 5 is a flow chart of a backlight control method according to a preferred embodiment of the present invention;

[0021] Figure 6 A schematic diagram of a display screen corresponding to input image data; and

[0022] Figure 7 A schematic diagram of a brightness enhancement comparison table. DETAILED DESCRIPTION

[0023] See also Figure 1 As shown, a display system in one preferred embodiment of the present invention is an endoscope display system applied in the medical field, which includes an endoscope assembly 10 and a display device 12. The endoscope assembly 10 includes a lens module 101, a light emitting module 102, a housing 103 and a transmission line 104. The display device 12 includes a backlight module 121, a display module 122 and a driving module 123.

[0024] In the endoscope assembly 10, the lens module 101 and the light module 102 are housed in the housing 103 and are electrically connected to the transmission line 104. The transmission line 104 can transmit power, image signals, drive signals, etc. in one direction or two directions, which is not limited here. Among them, the light module 102 is, for example, a light emitting diode, which can be embedded in the housing 103 and located at the front end of the endoscope assembly 10, for example, around the lens module 101. The light module 102 provides a light source for the image acquisition range direction of the lens module 101.

[0025] See also Figure 2 As shown, in the display device 12, the driving module 123 is coupled to the backlight module 121 and the display module 122, and can drive the backlight module 121 and the display module 122 respectively, so that the light L01 emitted by the backlight module 121 passes through the display module 122 and then displays an image on a display panel 1221, and controls the dimming and compensation process of the light-emitting unit 1211 of the backlight module 121.

[0026] The backlight module 121 is a direct-type backlight module. Figure 3As shown, the backlight module 121 has a plurality of light-emitting units 1211 arranged in an array, such as but not limited to light-emitting diodes (LEDs), organic light-emitting diodes (OLEDs), sub-millimeter light-emitting diodes (Mini-LEDs) or micro-light-emitting diodes (Micro-LEDs). This embodiment takes Mini-LEDs as an example. The so-called array arrangement refers to the arrangement and combination of the light-emitting units 1211 in rows and columns, which is not limited to an aligned arrangement or a staggered arrangement. Figure 3 and Figure 4 As shown, the array-arranged light-emitting units 1211 are divided into a plurality of groups, each of which constitutes a light-emitting area. This embodiment takes 12 light-emitting areas A01 to A12 as an example, but is not limited thereto. It can also be divided into, for example, 512 light-emitting areas or 1024 areas. Furthermore, each light-emitting area can include only one light-emitting unit.

[0027] Next, please also refer to Figure 1 as well as Figures 3 to 5 As shown, a backlight control method of a display system according to a preferred embodiment of the present invention is described. Figure 5 The flowchart of the backlight control method of the preferred embodiment of the present invention is shown. The backlight control method includes steps S01 to S06.

[0028] Step S01 generates input image data after the endoscope assembly 10 is inserted into the cavity and transmits it to the display device 12. In this embodiment, the endoscope assembly 10 can be operated by a doctor and inserted into, for example, large intestine tissue. In the large intestine cavity, the light module 102 provides light to the front of the endoscope assembly 10, and the lens module 101 collects the corresponding image to generate input image data.

[0029] In step S02, the display module 122 of the display device 12 receives input image data. The display screen corresponding to the input image data has a distribution of bright areas and dark areas. In this embodiment, since the light emitting module 102 of the endoscope assembly 10 surrounds the lens module 101, when the endoscope assembly 10 is extended into the large intestine cavity, it can be understood that Figure 6 As shown, the near view portion near the lens module 101 is brighter and clearer because it receives more light, while the area near the center of the image belongs to the far view and receives less light, so it displays a darker image. Figure 6 In the example of FIG. 1 , the bright area of ​​the embodiment presents a distribution of annular bright areas, while the dark area presents a distribution of central dark areas.

[0030] Back to Figure 5As shown, step S03 performs a regional dimming procedure on the backlight module 121 according to the input image data. Among them, the light-emitting units 1211 corresponding to each light-emitting area A01~A12 respectively have a regional dimming value. In this embodiment, the regional dimming procedure performs a regional dimming procedure on the backlight module 121 according to the gamma value (e.g., Gamma 2.2) of the display device 12. The regional dimming procedure includes the backlight module 121 independently adjusting the luminous brightness of each light-emitting unit 1211 according to the brightness of each part of the display screen. In this way, the brightness of the corresponding light-emitting unit 1211 can be reduced when displaying a dark image to increase the depth of black, and the brightness of the corresponding light-emitting unit 1211 can be increased when displaying a bright image to enhance the brightness of the image. The above-mentioned regional dimming procedure can apply AmLED technology, using an active matrix drive circuit to control the opening and closing of each sub-millimeter light-emitting diode, or to perform precise brightness control on each light-emitting area. In other words, this embodiment compensates for gamma when executing the local dimming process, and maintains the gamma value at 2.2 by adjusting the backlight brightness under different display areas. In addition, the local dimming process also includes compensating the local dimming value corresponding to the dark area based on the halo degree of the dark area to reduce the halo effect.

[0031] Step S04 obtains the peak brightness (Area Peak Luminance, APL) of each light-emitting area A01-A12. In the backlight module 121 of the display device 12, the peak brightness of each light-emitting area A01-A12 can be obtained by a light detection element, such as a photodiode. The number of light detection elements can be one or more, and there is no limitation here.

[0032] like Figure 7 As shown, step S05 determines the compensation brightness peak value of each luminous area according to the brightness enhancement comparison table T11 and the brightness peak value corresponding to each luminous area obtained in the above steps. In this embodiment, the brightness enhancement comparison table T11 contains compensation brightness peak values ​​corresponding to different brightness peak ranges. For example, when the brightness peak value is in the range of 10% to 20%, the corresponding compensation brightness peak value is 50% to 70%, and no adjustment is made when the brightness peak value is 1% or 100%. In other words, the brightness enhancement comparison table of the present invention only adjusts and compensates for part of the brightness interval. The above-mentioned brightness peak value and compensation brightness peak value values ​​are only examples and are not restrictive.

[0033] Step S06 uses each compensation brightness peak value in each corresponding light-emitting area A01-A12 in the backlight module 121. In this embodiment, the above-mentioned compensation brightness peak value is calculated by multiplying the brightness peak value of the light-emitting area and its corresponding brightness adjustment ratio. For example, assuming that the brightness peak value of the light-emitting area A06 is 20% and its brightness adjustment ratio is 3.5, the multiplication results in a compensation brightness peak value of 70%.

[0034] In summary, the display system and backlight control method of the present invention perform brightness compensation for a specific brightness range in the display screen. Generally speaking, a near-view image has a better brightness performance due to strong illumination, while a distant view image has a darker brightness performance due to weak illumination. Therefore, by performing brightness compensation for a specific brightness range, the distant view image can also have a better performance.

[0035] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the methods and technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A backlight control method for a display system, wherein the display system has a backlight module, a light-emitting surface of the backlight module is divided into a plurality of light-emitting areas, each of the light-emitting areas corresponds to at least one light-emitting unit, characterized in that: include: Receiving input image data by a display module of the display system; Performing a regional dimming procedure on the backlight module according to the input image data, wherein at least one light-emitting unit corresponding to each light-emitting area has a regional dimming value; Obtaining a brightness peak value of each of the light-emitting areas; Determine a compensation brightness peak value of each of the light-emitting areas according to a brightness enhancement comparison table and the brightness peak values ​​corresponding to the plurality of light-emitting areas; as well as Each of the compensation brightness peaks is used in each of the corresponding light-emitting areas in the backlight module.

2. The backlight control method according to claim 1, characterized in that: The brightness enhancement comparison table includes the compensation brightness peak values ​​corresponding to different brightness peak ranges.

3. The backlight control method according to claim 2, characterized in that: When the brightness peak is in the range of 10% to 20%, the corresponding compensation brightness peak is 50% to 70%.

4. The backlight control method according to claim 1, wherein: A display frame corresponding to the input image data has at least one bright area and at least one dark area.

5. The backlight control method according to claim 4, characterized in that: The bright area presents a distribution of annular bright areas, and the dark area presents a distribution of central dark areas.

6. The backlight control method according to claim 4, characterized in that: The local dimming procedure includes compensating the local dimming value corresponding to the dark area based on the halo level of the dark area.

7. The backlight control method according to claim 1, characterized in that: The compensation brightness peak value is calculated by multiplying the brightness peak value by a brightness adjustment ratio.

8. A display system, characterized in that: include: A display module, used for receiving an input image data; A backlight module having a light-emitting surface divided into a plurality of light-emitting areas, each of the light-emitting areas being provided with at least one light-emitting unit, wherein the at least one light-emitting unit corresponding to each of the light-emitting areas has a regional dimming value; as well as a driving unit, coupled to the display module and the backlight module respectively, and the driving unit performs a regional dimming procedure on the backlight module according to the input image data, and uses a plurality of compensation brightness peaks to correspond to the light-emitting areas in the backlight module; Wherein, each of the compensation brightness peaks is obtained according to a brightness enhancement comparison table and a brightness peak corresponding to each of the light-emitting areas.

9. The display system according to claim 8, characterized in that: The light emitting area is divided into at least one bright area and at least one dark area, and the compensation brightness peak is applied to the dark area.

10. The display system according to claim 9, characterized in that: When the brightness peak of the light-emitting area is in the range of 10% to 20%, the corresponding compensation brightness peak is 50% to 70%.

11. The display system according to claim 9, characterized in that: The bright area presents a distribution of annular bright areas, and the dark area presents a distribution of central dark areas.

12. The display system according to claim 9, characterized in that: The local dimming value is determined based on a halo level of the dark area.

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