TW202121392A - Display apparatus having display panel and humidity detection method thereof - Google Patents

Abstract

A display apparatus having a display panel and a humidity detection method thereof are provided. The humidity detection method includes: displaying a test pattern on the display panel; projecting an incident light to the test pattern of the display panel by a light source for generating a diffraction light; and detecting the diffraction light by a light detector for obtaining humidity information of the display panel.

Description

Display device with display panel and humidity detection method thereof

The present invention relates to a humidity detection method, in particular to a humidity detection method for a display panel.

With the development of display technology, liquid crystal on silicon (LCoS) panels have been equipped with high-resolution display capabilities, and thus liquid crystal on silicon panels have gradually become the mainstream in automotive head-up display (Automotive Head-up Display) design. trend. The silicon-based liquid crystal panel can modulate the phase of incident light through simple voltage control to generate a three-dimensional holographic image. The three-dimensional holographic image can be used as a display image of a vehicle dashboard. However, the phase modulation curve (that is, the characteristic curve of voltage versus phase) of the silicon-based liquid crystal panel is easily affected by environmental conditions such as temperature and humidity, which may cause deviation. Especially when the silicon-based liquid crystal panel is operated under high temperature or humidity, the display screen of the silicon-based liquid crystal panel will generate image noise due to the shift of the phase modulation curve, which will result in poor display quality.

The invention provides a display device with a display panel and a humidity detection method thereof. The display device can calibrate the gamma curve of the display panel according to the humidity information of the display panel.

An embodiment of the present invention provides a method for detecting humidity of a display panel. The humidity detection method includes: displaying a test pattern on the display panel; projecting incident light onto the test pattern of the display panel by a light source to generate diffracted light; and detecting the diffracted light by a photodetector to obtain the humidity of the display panel News.

Another embodiment of the present invention provides a display device. The display device includes a light source, a display panel, a light detector, and a controller. The light source is used to provide incident light. The display panel is used to display the test pattern. The incident light is projected to the test pattern of the display panel to generate diffracted light. The light detector is used to detect the diffracted light to generate the detection result. The controller is coupled to the display panel and the light detector, and obtains humidity information of the display panel according to the detection result of the light detector.

Another embodiment of the present invention provides a display device. The display device includes a display panel, a temperature sensor, and a controller. The temperature sensor is used to sense the temperature of the display panel to obtain temperature information. The controller is coupled to the display panel and the temperature sensor, and determines the humidity information of the display panel. The controller determines the gamma setting for the display panel based on the humidity information and temperature information.

Based on the above, in the embodiments of the present invention, the display device can obtain the humidity information of the display panel by detecting the diffracted light generated by the display panel. The display device can also obtain temperature information of the display panel through the temperature sensor. Therefore, the display device of the embodiments of the present invention can adjust the gamma setting of the display panel in real time according to the humidity information and the temperature information. Since the gamma setting of the display panel can be adjusted in real time as the operating conditions (temperature, humidity) of the display panel changes, the display screen of the display panel can maintain good image quality.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

The term "coupling (or connection)" used in the full text of the description of this case (including the scope of the patent application) can refer to any direct or indirect connection means. For example, if the text describes that the first device is coupled (or connected) to the second device, it should be interpreted as that the first device can be directly connected to the second device, or the first device can be connected through other devices or some This kind of connection means is indirectly connected to the second device. In addition, wherever possible, elements/components/steps with the same reference numbers in the drawings and embodiments represent the same or similar parts. Elements/components/steps that use the same reference numerals or use the same terms in different embodiments may refer to related descriptions.

FIG. 1A is a schematic diagram of a circuit block of a display device according to an embodiment of the invention. As shown in FIG. 1A, the display device 100 includes a light source 101, a display panel 102, a light detector 103 and a controller 104. The display panel 102 has a plurality of pixels (not shown). The display device 100 can drive the pixels at different positions on the display panel 102 according to design requirements, so that the display panel 102 can display a specific test pattern (not shown). The test pattern may be a pixel pattern that causes diffraction of light waves, such as a grating pattern.

The light source 101 can provide incident light 1011 and project the incident light 1011 to a test pattern (not shown) displayed on the display panel 102 to generate diffracted light DL. The light detector 103 can generate a detection result by detecting the diffracted light DL. For example, FIG. 1B is a schematic diagram illustrating the optical path configuration of the display device 100 of FIG. 1A according to an embodiment of the present invention. In the embodiment of FIG. 1B, the display panel 102 may display the grating pattern GR as the test pattern. According to design requirements, the display panel 102 in FIG. 1B may be a Liquid Crystal on Silicon (LCOS) panel or other liquid crystal panels, and the light source 101 in FIG. 1B may be a light projector for projecting a laser beam.

When the light source 101 projects the incident light 1011 to the grating pattern GR of the display panel 102, the display panel 102 will generate diffracted light DL. As shown in FIG. 1B, the diffracted light DL includes a first diffracted light component DL1 and a second diffracted light component DL2, and the diffraction order of the second diffracted light component DL2 is higher than that of the first diffracted light component DL1. In the embodiment of FIG. 1B, the first diffracted light component DL1 and the second diffracted light component DL2 detected by the photodetector 103 exhibit a higher correlation. For example, the diffraction order of the first diffracted light component DL1 may include at least one of 0, 1, and -1, and the diffraction order of the second diffracted light component DL2 may include 3. In other words, the first diffracted light component DL1 may include at least one of -1 order diffracted light C1, 0 order diffracted light C2, and +1 order diffracted light C3, and the second diffracted light component DL2 may include 3 order diffracted light .

As shown in FIG. 1B, an aperture 106 and a lens 107 are also arranged inside the display device 100. The aperture 106 is arranged between the display panel 102 and the lens 107. The aperture 106 can block the second diffracted light component DL2 and collect the first diffracted light component DL1 as signal light for forming a virtual display image. The lens 107 can make the first diffracted light component DL1 image on the outside of the display device 100 and improve the imaging field of view. The second diffracted light component DL2 can be received by the light detector 103 for light intensity detection.

Please refer to FIG. 1A again. The controller 104 is coupled to the light detector 103 so as to obtain the humidity information of the display panel 102 according to the detection result of the light detector 103. For example, the display device 100 may be configured with a look-up table 105. The look-up table 105 may be built with humidity reference information, for example, corresponding data between the light intensity of the second diffracted light component DL2 and the humidity value of the display panel 102. The controller 103 can obtain the light intensity of the second diffracted light component DL2 in the diffracted light DL by receiving the detection result of the light detector 103, and find the corresponding humidity value from the look-up table 105 for display Humidity information of the panel 102. In this way, the controller 103 can adjust the gamma setting of the display panel according to the humidity information of the display panel 102 to prevent the moisture inside the display panel 102 from affecting the image quality of the display screen.

It should be noted that, in the above embodiment, since the first diffracted light component DL1 is used as the signal light to form the virtual display image, and the second diffracted light component DL2 detected by the photodetector 103 is used for adjusting the display The gamma setting of the panel is the correction light, so if the correlation between the first diffracted light component DL1 and the second diffracted light component DL2 is higher, the gamma curve of the display panel can be corrected more accurately. Since the third-order diffracted light in the diffracted light DL has a high correlation with the first diffracted light component DL1, the embodiment of FIG. 1B selects the third-order diffracted light in the diffracted light DL as the second diffracted light component DL2. .

2 is a schematic flowchart of a method for detecting humidity of a display panel according to an embodiment of the present invention. 1 and 2, in step S200, the display panel 102 can display a test pattern. In step S210, the light source 101 may project the incident light 1011 to the test pattern of the display panel 102 to generate diffracted light DL. When the diffracted light DL is generated, the light detector 103 can detect the diffracted light DL in step S220, and provide the light intensity information of the diffracted light DL to the controller 104, so that the controller 104 can be based on the light intensity of the diffracted light DL The information and the humidity reference information in the lookup table 105 are used to obtain the humidity information of the display panel 102. The implementation details of step S200, step S210, and step S220 can be deduced by analogy with reference to the relevant description of the embodiment shown in FIG. 1A and FIG. 1B, and therefore will not be repeated.

In other embodiments, the controller 104 of FIG. 1A can also adjust at least one driving voltage of the display panel 102, and obtain the second diffracted light component DL2 in the diffracted light DL through the detection result provided by the light detector 103 In order to further obtain the voltage versus phase characteristic curve. In other words, during the adjustment period of the driving voltage, the controller 104 can obtain the voltage versus phase characteristic curve according to the light intensity changes caused by different driving voltages. According to the voltage versus phase characteristic curve, the controller 104 can find the corresponding humidity value from the look-up table 105 as the humidity information of the display panel 102.

In detail, the controller 104 can adjust at least one driving voltage of the display panel 102 to detect multiple light intensities of the second diffracted light component DL2 during the adjustment period of the driving voltage. The controller can calculate multiple phase values corresponding to the light intensities according to the light intensities (for example, calculate the phase value through a built-in conventional algorithm), and generate a voltage versus phase characteristic curve based on these phase values. After the controller 104 generates a voltage-to-phase characteristic curve by adjusting the driving voltage of the display panel 102, the controller 104 can compare the voltage-to-phase characteristic curve with the humidity reference information built in the look-up table 105 , In order to find the humidity value corresponding to the voltage versus phase characteristic curve from the look-up table 105, so as to determine the humidity state of the display panel 102.

For example, the look-up table 105 of FIG. 1A can be pre-built with multiple reference curves of voltage versus phase under different humidity conditions to serve as the humidity reference information of the look-up table 105. FIG. 3 is a schematic diagram illustrating the humidity reference information built in the lookup table 105 of FIG. 1A according to an embodiment of the present invention. In Fig. 3, the vertical axis represents the phase, and the horizontal axis represents the voltage. In the embodiment of FIG. 3, the humidity reference information of the look-up table 105 includes the first reference curve curve 1, the second reference curve curve 2, and the third reference curve curve 3. The first reference curve curve 1 corresponds to the humidity value H1, the second reference curve curve 2 corresponds to the humidity value H2, and the third reference curve curve 3 corresponds to the humidity value H3. The humidity values H1, H2, and H3 represent different humidity states respectively.

The controller 104 can apply a relatively large driving voltage to some or all pixels of the display panel 102 to change the light intensity of the second diffracted light component DL2. The controller 104 can also apply a small driving voltage to some or all pixels of the display panel 102 to change the light intensity of the second diffracted light component DL2. After the controller 104 generates a voltage-to-phase characteristic curve by adjusting the driving voltage of the display panel 102, the controller 104 can compare the voltage-to-phase characteristic curve with the reference curve in the look-up table 105 (ie, the first reference curve curve). 1. The second reference curve curve 2. The third reference curve curve 3) Compare one by one. Assuming that the voltage versus phase characteristic curve has a high degree of correlation with the first reference curve curve 1, the controller 104 can determine that the display panel 102 has a humidity value H1. Similarly, if the voltage-to-phase characteristic curve is highly correlated with the second reference curve curve 2, the controller 104 can determine that the display panel 102 has a humidity value H2.

4 is a schematic diagram illustrating the generation of test patterns on the display panel 102 of FIG. 1A according to an embodiment of the present invention. As shown in FIG. 4, the display panel 102 can display a grating pattern GR as a test pattern. The raster pattern GR includes a first row (column) pixel P1, a second row pixel P2, a third row pixel P3, a fourth row pixel P4, and a fifth row pixel P5 adjacent to each other. The adjacent row pixels in the grating pattern GR can be driven by different driving voltages (ie, V1, V2, V3, V4, V5). For example, the first driving voltage V1 of the pixel P1 in the first row may be different from the second driving voltage V2 of the pixel P2 in the second row, and the second driving voltage V2 of the pixel P2 in the second row may be different from the pixel in the third row. The third driving voltage V3 of P3, and so on. In the embodiment of FIG. 4, the first driving voltage V1 of the pixel P1 in the first row, the third driving voltage V3 of the pixel P3 in the third row, and the fifth driving voltage V5 of the pixel P5 in the fifth row may be greater than those of the second row. The second driving voltage V2 of the pixel P2 and the fourth driving voltage V4 of the fourth row pixel P4 (that is, V1, V3, V5 are all greater than V2, V4). Therefore, the display panel 102 can display the grating pattern GR of "bright/dark/bright/dark/bright".

1 and 4, suppose that the first driving voltage V1 is greater than the second driving voltage V2. The controller 104 can adjust the voltage difference between the first driving voltage V1 and the second driving voltage V2, so as to know that the second diffracted light component DL2 of the diffracted light DL is at the driving voltage through the detection result provided by the photodetector 103 Adjust multiple light intensities during the period. For example, the controller 104 may not adjust the first driving voltage V1 and increase the second driving voltage V2, so that the voltage difference between the first driving voltage V1 and the second driving voltage V2 is gradually reduced. The controller 104 may also not adjust the second driving voltage V2 and adjust the first driving voltage V1 so that the voltage difference between the first driving voltage V1 and the second driving voltage V2 is gradually reduced.

Since the voltage difference between the first driving voltage V1 and the second driving voltage V2 is changed, the brightness of the grating pattern GR will also be changed, thereby changing the light intensity of the second diffracted light component DL2. In other words, every time the voltage difference between the first driving voltage V1 and the second driving voltage V2 is changed, a corresponding light intensity of the second diffracted light component DL2 will be generated. Therefore, during the adjustment period of the voltage difference between the first driving voltage V1 and the second driving voltage V2, the photodetector 103 can detect a plurality of light intensities of the second diffracted light component DL2.

The controller 104 may calculate a plurality of phase values corresponding to the light intensities according to the plurality of light intensities detected by the light detector 103 (for example, calculate the phase values through a built-in conventional algorithm). The controller 104 can then generate a voltage versus phase characteristic curve based on these phase values.

For example, suppose that the look-up table 105 has been built with a reference curve of voltage versus phase as shown in FIG. 3. The controller 104 may compare the voltage versus phase characteristic curve with the reference curves in the lookup table 105 (ie, the first reference curve curve 1, the second reference curve curve 2, and the third reference curve curve 3) one by one. Assuming that the voltage versus phase characteristic curve has a high degree of correlation with the first reference curve curve 1, the controller 104 can determine that the display panel 102 has a humidity value H1. Similarly, if the voltage-to-phase characteristic curve is highly correlated with the second reference curve curve 2, the controller 104 can determine that the display panel 102 has a humidity value H2.

5A is a circuit block diagram of a display device according to another embodiment of the invention. As shown in FIG. 5A, the display device 500 includes a display panel 502, a controller 504, and a temperature sensor 506. The display panel 502 has a plurality of pixels (not shown). The display device 500 can drive the pixels in different positions on the display panel 502 according to design requirements, so that the display panel 502 can display a specific test pattern. The temperature sensor 506 may be disposed on the surface or inside of the display panel 502 to sense the temperature of the display panel 502. The controller 504 is coupled to the display panel 502 and the temperature sensor 506. The controller 504 can determine the humidity information of the display panel 502. Hereinafter, FIG. 5B will be used to illustrate how the controller 504 determines the humidity information of the display panel 502.

FIG. 5B is a circuit block diagram illustrating the display device 500 of FIG. 5A according to an embodiment of the present invention. As shown in FIG. 5B, the display device 500 further includes a light source 501, a light detector 503, and a look-up table 505. The light source 501 can provide incident light 5011 to the display panel 502. The display panel 502 can display a test pattern (not shown). The test pattern is, for example, a grating pattern that can cause diffraction of light waves. When the light source 501 projects the incident light 5011 onto the test pattern (not shown) of the display panel 502, the display panel 502 will generate diffracted light DL. The diffracted light DL includes a first diffracted light component DL1 and a second diffracted light component DL2, and the diffraction order of the second diffracted light component DL2 is higher than the diffraction order of the first diffracted light component DL1.

The light detector 503 can detect the second diffracted light component DL2 of the diffracted light DL, and provide the detection result to the controller 504. The controller 504 can obtain the humidity information of the display panel 502 according to the detection result. For example, the controller 504 can directly find the corresponding humidity value from the look-up table 505 according to the light intensity of the second diffracted light component DL2. The humidity information of the panel 502 is displayed. The controller 504 can also obtain the voltage versus phase characteristic curve related to the second diffracted light component DL2 by adjusting the driving voltage of the display panel 502. According to the voltage versus phase characteristic curve, the controller 504 can find the corresponding humidity value from the look-up table 505 as the humidity information of the display panel 502. The implementation details of the controller 504 obtaining the humidity information of the display panel 502 through the lookup table 505 can be deduced by analogy with the related descriptions of FIG. 1A, FIG. 1B and FIG.

Please refer to FIG. 5B again, the display panel 502 further includes a gamma buffer 5021. The gamma buffer 5021 can store the gamma settings of the display panel 502. For example, the gamma buffer 5021 can store the original gamma parameters of the display panel 502 for future calibration. In the embodiment of FIG. 5B, the temperature sensor 506 is disposed inside the display panel 502 to obtain temperature information of the display panel 502. The controller 504 can determine the gamma setting for the display panel 502 according to the humidity information of the display panel 502 and the temperature information of the display panel 502.

In some embodiments, the controller 504 may receive the temperature information provided by the temperature sensor 506 so as to adjust the gamma setting of the display panel 502 according to the temperature information of the display panel 502. In other embodiments, the controller 504 may also receive the detection result provided by the light detector 503, and find the humidity value corresponding to the detection result through the look-up table 505, thereby obtaining the display panel 502 The humidity information is used to adjust the gamma setting of the display panel 502 according to the humidity information of the display panel 502. In addition, the controller 504 can also adjust the gamma setting of the display panel 502 according to the humidity information of the display panel 502 and the temperature information of the display panel 502 at the same time.

For example, the lookup table 505 of FIG. 5B can be built with gamma information as shown in Table 1 below. T1, T2, and T3 shown in Table 1 respectively represent different temperature values. H1, H2, and H3 shown in Table 1 respectively represent different humidity values. G11, G12, G13, G21, G22, G23, G31, G32, G33 shown in Table 1 respectively represent the gamma parameters of the display panel 502 operating at a specific temperature and a specific humidity. For example, when the display panel 502 is operated at the humidity value H1 and the temperature value T1, the display panel 502 has a gamma parameter G11. When the display panel 502 is operated at the humidity value H1 and the temperature value T2, the display panel 502 has a gamma parameter G12, and so on. Table 1 temperature humidity T1 T2 T3 H1 G11 G12 G13 H2 G21 G22 G23 H3 G31 G32 G33

Please refer to FIG. 5B again. Assume that the controller 504 determines that the display panel 502 has a humidity value H1 according to the detection result of the light detector 503, and the controller 504 knows the display according to the sensing result of the temperature sensor 506 The panel 502 has a temperature value T2. According to the humidity value H1 and the temperature value T2, the controller 504 can determine that the display panel 502 has the gamma parameter G12 through the lookup table 505 (as shown in Table 1).

Since the gamma buffer 5021 stores the original gamma parameters of the display panel 502, the controller 504 can obtain the original gamma parameters of the display panel 502 through the gamma buffer 5021. The controller 504 can adjust the gamma parameter G12 according to the original gamma parameter, so as to correct the gamma curve of the display panel 502 at the humidity value H1 and the temperature value T2 to the original gamma curve. Through the above-mentioned calibration method, the controller 504 can adjust the gamma setting of the display panel in real time according to the humidity information and temperature information of the display panel 502. Therefore, the display panel 502 can maintain good display quality without being affected by operating conditions (temperature, humidity).

FIG. 6 is a schematic flowchart of a gamma curve correction method according to an embodiment of the present invention. Referring to FIGS. 5A and 6, in step S600, the controller 504 can determine the humidity information of the display panel 502. In step S610, the temperature sensor 506 can sense the temperature of the display panel 502 to obtain temperature information. After the controller 504 receives the temperature information provided by the temperature sensor 506, the controller 504 can determine the gamma setting for the display panel 502 according to the humidity information and the temperature information in step S620. The implementation details of step S600, step S610, and step S620 can be deduced by analogy with reference to the relevant description of the embodiment shown in FIG. 5A and FIG. 5B, and therefore will not be repeated.

In summary, in the embodiments of the present invention, the display device can obtain the humidity information of the display panel by detecting the diffracted light generated by the display panel. The display device can also obtain temperature information of the display panel through the temperature sensor. Therefore, the display device of the embodiments of the present invention can adjust the gamma setting of the display panel in real time according to the humidity information and the temperature information. Since the gamma setting of the display panel can be adjusted in real time as the operating conditions (temperature, humidity) of the display panel changes, the display screen of the display panel can maintain good image quality.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone with ordinary knowledge in the relevant technical field can make some changes and modifications without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be subject to those defined by the attached patent application scope.

100,500: display device 101,501: light source 102,502: display panel 103,503: Light detector 104,504: Controller 105, 505: lookup table 106: Aperture 107: lens 506: temperature sensor 1011, 5011: incident light 5021: Gamma buffer C1: -1 order diffracted light C2:0-order diffracted light C3: +1 order diffracted light curve 1: the first reference curve curve 2: the second reference curve curve 3: the third reference curve DL: Diffracted light DL1: The first diffracted light component DL2: The second diffracted light component G11, G12, G13: Gamma parameters G21, G22, G23: Gamma parameters G31, G32, G33: Gamma parameters GR: raster pattern H1, H2, H3: humidity value P1: the first row of pixels P2: second row of pixels P3: The third row of pixels P4: The fourth row of pixels P5: The fifth row of pixels T1, T2, T3: temperature value V1: first drive voltage V2: second drive voltage V3: Third drive voltage V4: Fourth driving voltage V5: Fifth driving voltage S200, S210, S220, S600, S610, S620: method steps

FIG. 1A is a schematic diagram of a circuit block of a display device according to an embodiment of the invention. FIG. 1B is a schematic diagram illustrating the optical path configuration of the display device 100 of FIG. 1A according to an embodiment of the present invention. 2 is a schematic flowchart of a method for detecting humidity of a display panel according to an embodiment of the present invention. FIG. 3 is a schematic diagram illustrating the humidity reference information built in the lookup table 105 of FIG. 1A according to an embodiment of the present invention. 4 is a schematic diagram illustrating the generation of test patterns on the display panel 102 of FIG. 1A according to an embodiment of the present invention. 5A is a circuit block diagram of a display device according to another embodiment of the invention. FIG. 5B is a circuit block diagram illustrating the display device 500 of FIG. 5A according to an embodiment of the present invention. FIG. 6 is a schematic flowchart of a gamma curve correction method according to an embodiment of the present invention.

S200, S210, S220: method steps

Claims (20)

A method for detecting humidity of a display panel includes: A test pattern is displayed by the display panel; A light source projects an incident light onto the test pattern of the display panel to generate a diffracted light; and A light detector detects the diffracted light to obtain humidity information of the display panel. The humidity detection method according to claim 1, wherein the step of detecting the diffracted light includes: Detecting a light intensity of the diffracted light; and According to the light intensity of the diffracted light, a corresponding humidity value is found from a look-up table as the humidity information of the display panel. The humidity detection method according to claim 1, wherein the step of detecting the diffracted light includes: Adjusting at least one driving voltage of the display panel and detecting the light intensity of the diffracted light to obtain a voltage versus phase characteristic curve; and According to the voltage versus phase characteristic curve, a corresponding humidity value is found from a look-up table as the humidity information of the display panel. The humidity detection method according to claim 3, wherein the step of obtaining the voltage versus phase characteristic curve includes: Adjusting the at least one driving voltage of the display panel to detect a plurality of light intensities of the diffracted light in a driving voltage adjustment period; Respectively calculating a plurality of phase values corresponding to the light intensities according to the light intensities; and The voltage versus phase characteristic curve is generated according to the phase values. The humidity detection method according to claim 1, wherein the display panel includes a silicon-based liquid crystal panel. The humidity detection method according to claim 1, wherein the diffracted light includes a first diffracted light component and a second diffracted light component, and the second diffracted light component has a higher order of diffraction than the first diffracted light component The first diffracted light component is used to image the outside of a display device with the display panel, and the second diffracted light component is used to provide the light detector for light intensity detection Measurement. The humidity detection method according to claim 6, wherein the diffraction order of the first diffracted light component includes at least one of 0, 1, and -1, and the diffraction order of the second diffracted light component The firing order includes 3. The humidity detection method according to claim 1, wherein the test pattern includes a grating pattern. The humidity detection method according to claim 8, wherein the grating pattern includes a first row of pixels and a second row of pixels adjacent to each other, and a first driving voltage of the first row of pixels is different from the A second driving voltage for the second row of pixels, wherein the step of detecting the diffracted light includes: Adjusting a voltage difference between the first driving voltage and the second driving voltage, so as to detect a plurality of light intensities of the diffracted light in a driving voltage adjustment period; Calculate multiple phase values corresponding to the light intensities according to the light intensities; Generating a voltage versus phase characteristic curve based on the phase values; and According to the voltage versus phase characteristic curve, a corresponding humidity value is found from a look-up table as the humidity information of the display panel. A display device includes: A light source for providing an incident light; A display panel for displaying a test pattern, wherein the incident light is projected to the test pattern of the display panel to generate a diffracted light; A light detector for detecting the diffracted light to generate a detection result; and A controller is coupled to the display panel and the light detector, and is used for obtaining humidity information of the display panel according to the detection result of the light detector. The display device according to claim 10, wherein the controller receives the detection result of the light detector to obtain the light intensity of the diffracted light, and the controller obtains the light intensity of the diffracted light from a Find a corresponding humidity value in the lookup table as the humidity information of the display panel. The display device according to claim 10, wherein The controller adjusts at least one driving voltage of the display panel, and obtains the light intensity of the diffracted light according to the detection result provided by the light detector to obtain a voltage versus phase characteristic curve; and The controller finds a corresponding humidity value from a look-up table according to the voltage versus phase characteristic curve as the humidity information of the display panel. The display device according to claim 12, wherein The controller adjusts the at least one driving voltage of the display panel, so as to obtain a plurality of lights of the diffracted light in a driving voltage adjustment period of the at least one driving voltage through the detection result provided by the light detector strength; The controller respectively calculates a plurality of phase values corresponding to the light intensities according to the light intensities; and The controller generates the voltage versus phase characteristic curve according to the phase values. The display device according to claim 10, wherein the display panel includes a silicon-based liquid crystal panel. The display device according to claim 10, wherein the diffracted light includes a first diffracted light component and a second diffracted light component, and the diffraction order of the second diffracted light component is higher than that of the first diffracted light component. The order of radiation, the first diffracted light component is used to image the outside of the display device, and the second diffracted light component is used to provide the light detector for light intensity detection. The display device according to claim 15, wherein the diffraction order of the first diffracted light component includes at least one of 0, 1, and -1, and the diffraction order of the second diffracted light component The number includes 3. The display device according to claim 15, further comprising: An aperture is used to block the second diffracted light component. The display device according to claim 17, further comprising: A lens for improving an imaging field of view, wherein the aperture is arranged between the display panel and the lens. The display device according to claim 10, wherein the test pattern includes a grating pattern. The display device according to claim 19, wherein The grating pattern includes a first row of pixels and a second row of pixels adjacent to each other, and a first driving voltage of the first row of pixels is different from a second driving voltage of the second row of pixels; The controller adjusts a voltage difference between the first driving voltage and the second driving voltage, so as to obtain the amount of the diffracted light in a driving voltage adjustment period through the detection result provided by the photodetector Light intensity The controller respectively calculates a plurality of phase values corresponding to the light intensities according to the light intensities; The controller generates a voltage versus phase characteristic curve according to the phase values; and The controller finds a corresponding humidity value from a look-up table according to the voltage versus phase characteristic curve as the humidity information of the display panel.

Images