CN111766723A - Display device, humidity detection method of display panel and gamma curve correction method - Google Patents
Display device, humidity detection method of display panel and gamma curve correction method Download PDFInfo
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- CN111766723A CN111766723A CN201910262457.2A CN201910262457A CN111766723A CN 111766723 A CN111766723 A CN 111766723A CN 201910262457 A CN201910262457 A CN 201910262457A CN 111766723 A CN111766723 A CN 111766723A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/1306—Details
- G02F1/1309—Repairing; Testing
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/06—Adjustment of display parameters
- G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
Abstract
A humidity detection method and a gamma curve correction method for a display device and a display panel are provided. The humidity detection method comprises the following steps: displaying the test pattern by the display panel; projecting incident light to a test pattern of a display panel by a light source to generate diffracted light; and detecting the diffracted light by a light detector to obtain humidity information of the display panel. The humidity information of the display panel can be used to adjust the gamma setting of the display panel.
Description
Technical Field
The present invention relates to a humidity detection method, and more particularly, to a humidity detection method and a gamma curve correction method for a display panel.
Background
With the development of display technology, Liquid Crystal on Silicon (LCoS) panels have high resolution display capability, and thus are becoming the mainstream trend in the design of Automotive Head-up displays. The LCOS panel can modulate the phase of the incident light by simple voltage control to generate a stereoscopic holographic image. The stereoscopic holographic image can be used as a display image of an automobile instrument panel. However, the phase modulation curve (i.e. the characteristic curve of voltage versus phase) of the lcos panel is susceptible to temperature and humidity and is prone to shift. Especially, when the LCOS panel is operated at a higher temperature or humidity, the display image of the LCOS panel generates image noise due to the shift of the phase modulation curve, thereby resulting in a poor display quality.
Disclosure of Invention
The invention provides a display device with a display panel, a humidity detection method and a gamma curve correction method thereof. The display device can correct the gamma curve of the display panel according to the humidity information of the display panel.
An embodiment of the invention provides a humidity detection method for a display panel. The humidity detection method comprises the following steps: displaying the test pattern by the display panel; projecting incident light to a test pattern of a display panel by a light source to generate diffracted light; and detecting the diffracted light by a light detector to obtain humidity information of the display panel.
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 for providing incident light. The display panel is used for displaying the test pattern. Incident light is projected to a test pattern of the display panel to generate diffracted light. The light detector is used for detecting the diffracted light to generate a detection result. The controller is coupled to the display panel and the light detector, and obtains humidity information of the display panel according to a detection result of the light detector.
Another embodiment of the present invention provides a gamma curve correction method. The gamma curve correction method comprises the following steps: judging humidity information of the display panel; the temperature sensor senses the temperature of the display panel to obtain temperature information; and determining gamma setting for the display panel according to the humidity information and the temperature information.
Another embodiment of the present invention provides a display device. The display device comprises a display panel, a temperature sensor and a controller. The temperature sensor is used for sensing the temperature of the display panel to obtain temperature information. The controller is coupled with the display panel and the temperature sensor and judges the humidity information of the display panel. The controller determines a gamma setting for the display panel according to the humidity information and the temperature information.
In view of the above, in embodiments of the present invention, the display device may obtain the humidity information of the display panel by detecting the diffracted light generated by the display panel. The display device can also obtain the temperature information of the display panel through the temperature sensor. Therefore, the display device according to the embodiments of the 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 change, the display screen of the display panel can maintain good image quality.
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1A is a schematic circuit block diagram of a display device according to an embodiment of the invention.
Fig. 1B is a schematic diagram illustrating an optical path configuration of the display device 100 in fig. 1A according to an embodiment of the invention.
FIG. 2 is a flowchart illustrating a humidity detection method of a display panel according to an embodiment of the invention.
FIG. 3 is a diagram illustrating the humidity reference information built in the lookup table 105 of FIG. 1A according to an embodiment of the invention.
FIG. 4 is a diagram illustrating the display panel 102 of FIG. 1A generating a test pattern according to an embodiment of the invention.
FIG. 5A is a block diagram of a display device according to another embodiment of the invention.
FIG. 5B is a block diagram illustrating the display apparatus 500 of FIG. 5A according to an embodiment of the invention.
FIG. 6 is a flowchart illustrating a gamma curve calibration method according to an embodiment of the invention.
Description of reference numerals:
100. 500: display device
101. 501: light source
102. 502: display panel
103. 503: light detector
104. 504, a step of: controller
105. 505: lookup table
106: aperture
107: lens and lens assembly
506: temperature sensor
1011. 5011: incident light
5021: gamma buffer
C1: diffracted light of order-1
C2: diffracted light of 0 order
C3: +1 st order diffracted light
cure 1: first reference curve
curve 2: second reference curve
curve 3: third reference curve
DL: diffracted light
DL 1: a first diffracted light component
DL 2: a second diffracted light component
G11, G12, G13: gamma parameter
G21, G22, G23: gamma parameter
G31, G32, G33: gamma parameter
GR: raster pattern
H1, H2, H3: humidity value
P1: first column of pixels
P2: second column of pixels
P3: third column of pixels
P4: fourth column of pixels
P5: fifth column of pixels
T1, T2, T3: temperature value
V1: first driving voltage
V2: second driving voltage
V3: third driving voltage
V4: fourth drive voltage
V5: fifth driving voltage
S200, S210, S220, S600, S610, S620: method step
Detailed Description
The term "coupled" as used throughout this specification, including the claims, may refer to any direct or indirect connection means. For example, if a first device couples (or connects) to a second device, it should be construed that the first device may be directly connected to the second device or the first device may be indirectly connected to the second device through another device or some connection means. Further, wherever possible, the same reference numbers will be used throughout the drawings and the description to refer to the same or like parts. Elements/components/steps in different embodiments using the same reference numerals or using the same terms may be referred to one another in relation to the description.
Fig. 1A is a schematic circuit block diagram 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), and 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, such as a grating pattern, that diffracts light waves.
The light source 101 may 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 photodetector 103 may generate a detection result by detecting the diffracted light DL. For example, fig. 1B is a schematic diagram illustrating an optical path configuration of the display device 100 of fig. 1A according to an embodiment of the invention. In the embodiment of fig. 1B, the display panel 102 can display the grating pattern GR as a test pattern. According to design requirements, the display panel 102 of fig. 1B may be a Liquid Crystal on Silicon (LCoS) panel or other Liquid Crystal panels, and the light source 101 of fig. 1B may be a light projector for projecting laser beams.
When the light source 101 projects incident light 1011 onto 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 DL 1. In the embodiment of fig. 1B, a higher correlation (higher coherence) is shown between the first diffracted light component DL1 and the second diffracted light component DL2 detected by the photodetector 103. For example, the diffraction order of the first diffractive light component DL1 can include at least one of 0, 1 and-1, and the diffraction order of the second diffractive light component DL2 can include 3. In other words, the first diffractive light component DL1 may include at least one of-1 st order diffractive light C1, 0 th order diffractive light C2 and +1 st order diffractive light C3, and the second diffractive light component DL2 may include 3 rd order diffractive light.
As shown in fig. 1B, an aperture 106 and a lens 107 are disposed inside the display device 100. The aperture 106 is disposed between the display panel 102 and the lens 107. The diaphragm 106 may block the second diffracted light component DL2 and collect the first diffracted light component DL1 as signal light forming a virtual display image. The lens 107 can make the first diffracted light component DL1 image outside the display device 100 and improve the imaging field of view. The second diffracted light component DL2 may then be received by the photodetector 103 for detection of light intensity.
Referring 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 lookup table 105 may be built with humidity reference information, such as 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 know the light intensity of the second diffracted light component DL2 in the diffracted light DL via the detection result of the receiving light detector 103 and find out the corresponding humidity value from the look-up table 105 as the humidity information of the display 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, so as to prevent 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 for forming the virtual display image and the second diffracted light component DL2 detected by the photodetector 103 is used as the correction light for adjusting the gamma setting of the display panel, the higher the correlation (correlation) between the first diffracted light component DL1 and the second diffracted light component DL2, the more accurately the gamma curve of the display panel can be corrected. Since the correlation between the 3 rd order diffracted light in the diffracted light DL and the first diffracted light component DL1 is high, the embodiment of fig. 1B selects the 3 rd order diffracted light in the diffracted light DL as the second diffracted light component DL 2.
FIG. 2 is a flowchart illustrating a humidity detection method of a display panel according to an embodiment of the invention. Referring to fig. 1 and 2, in step S200, the display panel 102 may 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 the diffracted light DL. When the diffracted light DL is generated, the light detector 103 may detect the diffracted light DL in step S220 and provide the light intensity information of the diffracted light DL to the controller 104, so as to allow the controller 104 to obtain the humidity information of the display panel 102 according to the light intensity information of the diffracted light DL and the humidity reference information in the look-up table 105. The implementation details of step S200, step S210 and step S220 can be analogized with reference to the related descriptions of the embodiments shown in fig. 1A and fig. 1B, and therefore, the details are not repeated.
In other embodiments, the controller 104 of fig. 1A may further adjust at least one driving voltage of the display panel 102, and obtain the light intensity of the second diffracted light component DL2 in the diffracted light DL according to the detection result provided by the photodetector 103, so as to further obtain a 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 variation caused by different driving voltages. According to the voltage-to-phase characteristic curve, the controller 104 can find out the corresponding humidity value from the look-up table 105 as the humidity information of the display panel 102.
In detail, the controller 104 may adjust at least one driving voltage of the display panel 102 so as to detect a plurality of light intensities of the second diffracted light component DL2 during the adjustment of the driving voltage. The controller may calculate a plurality of phase values corresponding to the light intensities according to the light intensities (for example, calculate the phase values through a built-in conventional algorithm), and generate a voltage-to-phase characteristic curve according to the phase values. After the controller 104 generates the voltage-to-phase characteristic curve by adjusting the driving voltage of the display panel 102, the controller 104 may compare the voltage-to-phase characteristic curve with the humidity reference information built in the lookup table 105, so as to find out a humidity value corresponding to the voltage-to-phase characteristic curve from the lookup table 105, thereby determining the humidity state of the display panel 102.
For example, the lookup table 105 of fig. 1A may be pre-configured with a plurality of voltage versus phase reference curves under different humidity conditions as the humidity reference information of the lookup table 105. FIG. 3 is a diagram illustrating the humidity reference information built in the lookup table 105 of FIG. 1A according to an embodiment of the invention. The vertical axis in fig. 3 represents phase and the horizontal axis represents voltage. In the embodiment of fig. 3, the humidity reference information of the lookup table 105 includes a first reference curve1, a second reference curve2 and a third reference curve 3. The first reference curve1 corresponds to a humidity value H1, the second reference curve2 corresponds to a humidity value H2, and the third reference curve 3 corresponds to a humidity value H3. The humidity values H1, H2, H3 represent different humidity states, respectively.
The controller 104 may apply a larger driving voltage to some or all of the pixels of the display panel 102 to change the light intensity of the second diffracted light component DL 2. The controller 104 may also apply a smaller driving voltage to some or all of the pixels of the display panel 102 to change the light intensity of the second diffracted light component DL 2. After the controller 104 generates the voltage-to-phase characteristic curve by adjusting the driving voltage of the display panel 102, the controller 104 may compare the voltage-to-phase characteristic curve with the reference curves (i.e., the first reference curve1, the second reference curve2, and the third reference curve 3) in the lookup table 105 one by one. Assuming that the voltage versus phase characteristic curve is highly correlated with the first reference curve1, the controller 104 may determine that the display panel 102 has a humidity value H1. Similarly, if the voltage versus phase characteristic curve is highly correlated with the second reference curve2, the controller 104 may determine that the display panel 102 has the humidity value H2.
FIG. 4 is a diagram illustrating the display panel 102 of FIG. 1A generating a test pattern according to an embodiment of the invention. As shown in fig. 4, the display panel 102 may display the grating pattern GR as a test pattern. The raster pattern GR includes a first column (column) of pixels P1, a second column of pixels P2, a third column of pixels P3, a fourth column of pixels P4, and a fifth column of pixels P5, which are adjacent to each other. Adjacent column pixels in the raster pattern GR may be driven by different driving voltages (i.e., V1, V2, V3, V4, V5). For example: the first driving voltage V1 of the first column of pixels P1 may be different from the second driving voltage V2 of the second column of pixels P2, the second driving voltage V2 of the second column of pixels P2 may be different from the third driving voltage V3 of the third column of pixels P3, and so on. In the embodiment of fig. 4, the first driving voltage V1 of the first row of pixels P1, the third driving voltage V3 of the third row of pixels P3 and the fifth driving voltage V5 of the fifth row of pixels P5 may be greater than the second driving voltage V2 of the second row of pixels P2 and the fourth driving voltage V4 of the fourth row of pixels P4 (i.e., V1, V3 and V5 are all greater than V2 and V4). Accordingly, the display panel 102 may display a "bright/dark/bright" raster pattern GR.
Referring to fig. 1 and fig. 4, it is assumed that the first driving voltage V1 is greater than the second driving voltage V2. The controller 104 may adjust the voltage difference between the first driving voltage V1 and the second driving voltage V2 so as to know a plurality of light intensities of the second diffracted light component DL2 of the diffracted light DL during the driving voltage adjustment period via the detection result provided by the photodetector 103. For example, the controller 104 may not adjust the first driving voltage V1, but adjust the second driving voltage V2 such that the voltage difference between the first driving voltage V1 and the second driving voltage V2 gradually decreases. The controller 104 may also adjust the first driving voltage V1 to decrease the voltage difference between the first driving voltage V1 and the second driving voltage V2 without adjusting the second driving voltage V2.
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 is also changed, and the light intensity of the second diffracted light component DL2 is changed. In other words, each 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 is 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 DL 2.
The controller 104 may calculate a plurality of phase values corresponding to the plurality of light intensities detected by the light detector 103, respectively (e.g., calculate the phase values by a built-in known algorithm). The controller 104 may then generate a voltage versus phase characteristic based on the phase values.
For example, assume that the look-up table 105 has been built with a voltage versus phase reference curve as shown in FIG. 3. The controller 104 can compare the characteristic curve of the voltage versus the phase with the reference curves (i.e. the first reference curve1, the second reference curve2, and the third reference curve 3) in the lookup table 105 one by one. Assuming that the voltage versus phase characteristic curve is highly correlated with the first reference curve1, the controller 104 may determine that the display panel 102 has a humidity value H1. Similarly, if the voltage versus phase characteristic curve is highly correlated with the second reference curve2, the controller 104 may determine that the display panel 102 has the humidity value H2.
FIG. 5A is a 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), and the display device 500 can drive the pixels at 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 of or inside 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 may determine humidity information of the display panel 502. How the controller 504 determines the humidity information of the display panel 502 will be described with reference to fig. 5B.
FIG. 5B is a block diagram illustrating the display apparatus 500 of FIG. 5A according to an embodiment of the invention. As shown in fig. 5B, the display device 500 further includes a light source 501, a light detector 503, and a lookup table 505. The light source 501 may provide incident light 5011 to the display panel 502. The display panel 502 may display a test pattern (not shown). The test pattern is, for example, a grating pattern that diffracts light waves. When the light source 501 projects incident light 5011 to a 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 that of the first diffracted light component DL 1.
The photodetector 503 may detect the second diffracted light component DL2 of the diffracted light DL and provide the detection result to the controller 504. The controller 504 may obtain the humidity information of the display panel 502 according to the detection result, for example, the controller 504 may directly find out a corresponding humidity value from the lookup table 505 as the humidity information of the display panel 502 according to the light intensity of the second diffracted light component DL 2. The controller 504 can also obtain a voltage-versus-phase characteristic curve associated with the second diffracted light component DL2 by adjusting the driving voltage of the display panel 502. According to the voltage-to-phase characteristic curve, the controller 504 can find a corresponding humidity value from the lookup table 505 as the humidity information of the display panel 502. The details of the implementation of obtaining the humidity information of the display panel 502 by the controller 504 through the lookup table 505 can be analogized with reference to the related descriptions of fig. 1A, 1B and 3, and therefore will not be described again.
Referring to fig. 5B, the display panel 502 further includes a gamma buffer 5021. The gamma buffer 5021 may store gamma settings of the display panel 502, for example, the gamma buffer 5021 may store raw gamma parameters of the display panel 502 for later calibration. In the embodiment of FIG. 5B, the temperature sensor 506 is disposed inside the display panel 502 to obtain the temperature information of the display panel 502. The controller 504 may 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 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 lookup table 505, thereby obtaining the humidity information of the display panel 502, and then 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 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 may be built with gamma information as shown in table 1 below. T1, T2, and T3 shown in table 1 represent different temperature values, respectively. H1, H2, and H3 shown in table 1 each represent a different humidity value. G11, G12, G13, G21, G22, G23, G31, G32, and G33 shown in table 1 respectively indicate gamma parameters of the display panel 502 operated at a specific temperature and a specific humidity. For example, when the display panel 502 operates at the humidity value H1 and the temperature value T1, the display panel 502 has the gamma parameter G11. When the display panel 502 operates at the humidity value H1 and the temperature value T2, the display panel 502 has the gamma parameter G12, and so on.
TABLE 1
Referring to fig. 5B, it is assumed that the controller 504 determines that the display panel 502 has the humidity value H1 according to the detection result of the photodetector 503, and the controller 504 knows that the display panel 502 has the temperature value T2 according to the sensing result of the temperature sensor 506. 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 raw gamma parameters of the display panel 502, the controller 504 can obtain the raw gamma parameters of the display panel 502 via the gamma buffer 5021. The controller 504 may 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 calibration, the controller 504 can adjust the gamma setting of the display panel in real time according to the humidity information and the temperature information of the display panel 502. Therefore, the display panel 502 can maintain good display quality without being affected by operating conditions (temperature and humidity).
FIG. 6 is a flowchart illustrating a gamma curve calibration method according to an embodiment of the invention. Referring to fig. 5A and fig. 6, in step S600, the controller 504 may determine humidity information of the display panel 502. In step S610, the temperature sensor 506 may 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 may 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 analogized with reference to the related descriptions of the embodiments shown in fig. 5A and fig. 5B, and therefore, the description is omitted.
In summary, in the embodiments of the 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 the temperature information of the display panel through the temperature sensor. Therefore, the display device according to various 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 change, the display screen of the display panel can maintain good image quality.
Although the present invention has been described with reference to the above embodiments, the above embodiments are not intended to limit the present invention, and one of ordinary skill in the art may make certain changes and modifications without departing from the spirit and scope of the present invention, so that the scope of the present invention shall be defined by the appended claims.
Claims (44)
1. A humidity detection method of a display panel comprises the following steps:
displaying a test pattern by the display panel;
projecting an incident light to the test pattern of the display panel by a light source to generate a diffraction light; and
the diffracted light is detected by a photodetector to obtain humidity information of the display panel.
2. The humidity detecting method as claimed in claim 1, wherein said step of detecting the diffracted light comprises:
detecting a light intensity of the diffracted light; and
according to the light intensity of the diffracted light, a corresponding humidity value is found out from a lookup table to serve as the humidity information of the display panel.
3. The humidity detecting method as claimed in claim 1, wherein said step of detecting the diffracted light comprises:
adjusting at least one driving voltage of the display panel and detecting the light intensity of the diffracted light to obtain a voltage-phase characteristic curve; and
according to the voltage-to-phase characteristic curve, a corresponding humidity value is found from a lookup table to serve as the humidity information of the display panel.
4. The humidity sensing method as claimed in claim 3, wherein said step of obtaining the voltage versus phase characteristic comprises:
adjusting the at least one driving voltage of the display panel so as to detect a plurality of light intensities of the diffracted light in a driving voltage adjustment period;
calculating a plurality of phase values corresponding to the plurality of light intensities according to the plurality of light intensities; and
and generating the voltage-to-phase characteristic curve according to the plurality of phase values.
5. The humidity sensing method as claimed in claim 1, wherein the display panel comprises a liquid crystal on silicon panel.
6. The humidity detecting method as claimed in claim 1, wherein the diffracted light includes a first diffracted light component and a second diffracted light component, the diffraction order of the second diffracted light component is higher than that of the first diffracted light component, the first diffracted light component is for imaging outside a display device having the display panel, and the second diffracted light component is for providing to the photodetector to perform the detection of the light intensity.
7. The humidity sensing method as claimed in 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 includes 3.
8. The method of moisture detection as in claim 1, wherein the test pattern comprises a grating pattern.
9. The humidity sensing method as recited in claim 8, wherein the raster pattern includes a first column of pixels and a second column of pixels adjacent to each other, a first driving voltage of the first column of pixels being different from a second driving voltage of the second column of pixels, wherein said 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 adjusting period;
calculating a plurality of phase values corresponding to the plurality of light intensities according to the plurality of light intensities;
generating a voltage versus phase characteristic curve according to the plurality of phase values; and
according to the voltage-to-phase characteristic curve, a corresponding humidity value is found from a lookup table to serve as the humidity information of the display panel.
10. A display device, comprising:
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 diffraction light;
a light detector for detecting the diffracted light to generate a detection result; and
and the controller is coupled with the display panel and the light detector and used for obtaining humidity information of the display panel according to the detection result of the light detector.
11. The display apparatus of 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 finds a corresponding humidity value from a lookup table as the humidity information of the display panel according to the light intensity of the diffracted light.
12. The display device of 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 photodetector so as to obtain a voltage-phase characteristic curve; and
the controller finds out a corresponding humidity value from a lookup table as the humidity information of the display panel according to the voltage-to-phase characteristic curve.
13. The display device of claim 12, wherein:
the controller adjusts the at least one driving voltage of the display panel so as to obtain a plurality of light intensities of the diffracted light in a driving voltage adjustment period of the at least one driving voltage through the detection result provided by the photodetector;
the controller respectively calculates a plurality of phase values corresponding to the plurality of light intensities according to the plurality of light intensities; and
the controller generates the voltage-to-phase characteristic curve according to the plurality of phase values.
14. The display device of claim 10, wherein the display panel comprises a liquid crystal on silicon panel.
15. The display device of claim 10, wherein the diffracted light includes a first diffracted light component and a second diffracted light component, the second diffracted light component having a higher diffraction order than the first diffracted light component, the first diffracted light component for imaging outside the display device, and the second diffracted light component for providing to the photodetector for light intensity detection.
16. The display device of claim 15 wherein the diffraction order of the first diffractive light component comprises at least one of 0, 1, or-1 and the diffraction order of the second diffractive light component comprises 3.
17. The display device of claim 15, further comprising:
an aperture for blocking the second diffracted light component.
18. The display device of claim 17, further comprising:
and the lens is used for improving an imaging field of view, wherein the aperture is arranged between the display panel and the lens.
19. The display device of claim 10, wherein the test pattern comprises a raster pattern.
20. The display device of claim 19, wherein
The raster pattern comprises a first row of pixels and a second row of pixels which are adjacent to each other, wherein 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 a plurality of light intensities of the diffracted light in a driving voltage adjusting period through the detection result provided by the photodetector;
the controller respectively calculates a plurality of phase values corresponding to the plurality of light intensities according to the plurality of light intensities;
the controller generates a voltage-to-phase characteristic curve according to the plurality of phase values; and
the controller finds out a corresponding humidity value from a lookup table as the humidity information of the display panel according to the voltage-to-phase characteristic curve.
21. A gamma curve correction method, comprising:
judging humidity information of a display panel;
sensing the temperature of the display panel by a temperature sensor to obtain temperature information; and
determining a gamma setting for the display panel according to the humidity information and the temperature information.
22. The gamma curve correcting method of claim 21, wherein the step of determining the humidity information of the display panel comprises:
displaying a test pattern by the display panel;
projecting an incident light to the test pattern of the display panel by a light source to generate a diffraction light; and
the diffracted light is detected by a photodetector to obtain the humidity information of the display panel.
23. The gamma curve correcting method of claim 22, wherein the step of detecting the diffracted light comprises:
detecting the light intensity of the diffracted light; and
according to the light intensity of the diffracted light, a corresponding humidity value is found out from a lookup table to serve as the humidity information of the display panel.
24. The gamma curve correcting method of claim 22, wherein the step of detecting the diffracted light comprises:
adjusting at least one driving voltage of the display panel and detecting the light intensity of the diffracted light to obtain a voltage-phase characteristic curve; and
according to the voltage-to-phase characteristic curve, a corresponding humidity value is found from a lookup table to serve as the humidity information of the display panel.
25. The gamma curve correction method of claim 24, wherein the step of obtaining the voltage versus phase characteristic comprises:
adjusting the at least one driving voltage of the display panel so as to detect a plurality of light intensities of the diffracted light in a driving voltage adjustment period;
calculating a plurality of phase values corresponding to the plurality of light intensities according to the plurality of light intensities; and
and generating the voltage-to-phase characteristic curve according to the plurality of phase values.
26. The gamma curve correcting method of claim 22, wherein the diffracted light includes a first diffracted light component and a second diffracted light component, the diffraction order of the second diffracted light component is higher than that of the first diffracted light component, the first diffracted light component is used for imaging outside a display device having the display panel, and the second diffracted light component is provided to the photodetector for light intensity detection.
27. The gamma curve correcting method of claim 26 wherein the diffraction order of the first diffracted light component comprises at least one of 0, 1, and-1, and the diffraction order of the second diffracted light component comprises 3.
28. The gamma curve correcting method of claim 22, wherein the test pattern comprises a raster pattern.
29. The method of claim 28, wherein the raster pattern comprises a first column of pixels and a second column of pixels adjacent to each other, a first driving voltage of the first column of pixels being different from a second driving voltage of the second column of pixels, wherein said detecting the diffracted light comprises:
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 adjusting period;
calculating a plurality of phase values corresponding to the plurality of light intensities according to the plurality of light intensities;
generating a voltage versus phase characteristic curve according to the plurality of phase values; and
according to the voltage-to-phase characteristic curve, a corresponding humidity value is found from a lookup table to serve as the humidity information of the display panel.
30. The method of claim 21, wherein the display panel comprises a liquid crystal on silicon panel.
31. The method of claim 21, wherein the determining the gamma setting for the display panel comprises:
according to the humidity information and the temperature information, finding out corresponding gamma setting information from a lookup table as the gamma setting.
32. A display device, comprising:
a display panel;
a temperature sensor for sensing the temperature of the display panel to obtain temperature information; and
a controller coupled to the display panel and the temperature sensor for determining a humidity information of a display panel, wherein the controller determines a gamma setting for the display panel according to the humidity information and the temperature information.
33. The display device of claim 32, further comprising:
a light source for providing an incident light, wherein the display panel displays a test pattern, and the incident light is projected to the test pattern of the display panel to generate a diffraction light; and
a light detector coupled to the controller for detecting the diffracted light to generate a detection result;
wherein the controller obtains the humidity information of the display panel according to the detection result of the photodetector.
34. The display device of claim 33, wherein the controller receives the detection result of the light detector to obtain the light intensity of the diffracted light, and the controller finds a corresponding humidity value from a lookup table as the humidity information of the display panel according to the light intensity of the diffracted light.
35. The display device of claim 33, wherein
The controller adjusts at least one driving voltage of the display panel and obtains the light intensity of the diffracted light through the detection result provided by the photodetector to obtain a voltage-phase characteristic curve; and
the controller finds out a corresponding humidity value from a lookup table as the humidity information of the display panel according to the voltage-to-phase characteristic curve.
36. The display device of claim 35, wherein
The controller adjusts at least one driving voltage of the display panel so as to obtain a plurality of light intensities of the diffracted light in a driving voltage adjusting period through the detection result provided by the photodetector;
the controller respectively calculates a plurality of phase values corresponding to the plurality of light intensities according to the plurality of light intensities; and
the controller generates the voltage-to-phase characteristic curve according to the plurality of phase values.
37. The display device of claim 33, wherein the diffracted light comprises a first diffracted light component and a second diffracted light component, the diffraction order of the second diffracted light component is higher than that of the first diffracted light component, the first diffracted light component is for imaging outside of a display device having the display panel, and the second diffracted light component is for providing to the photodetector to perform detection of light intensity.
38. The display device of claim 37 wherein the diffraction order of the first diffractive light component comprises at least one of 0, 1, or-1 and the diffraction order of the second diffractive light component comprises 3.
39. The display device of claim 37, further comprising:
an aperture for blocking the second diffracted light component.
40. The display device of claim 39, further comprising:
and the lens is used for improving an imaging field of view, wherein the aperture is arranged between the display panel and the lens.
41. The display device of claim 33, wherein the test pattern comprises a raster pattern.
42. The display device of claim 41, wherein
The raster pattern comprises a first row of pixels and a second row of pixels which are adjacent to each other, wherein 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 a plurality of light intensities of the diffracted light in a driving voltage adjusting period through the detection result provided by the photodetector;
the controller respectively calculates a plurality of phase values corresponding to the plurality of light intensities according to the plurality of light intensities;
the controller generates a voltage-to-phase characteristic curve according to the plurality of phase values; and
the controller finds out a corresponding humidity value from a lookup table as the humidity information of the display panel according to the voltage-to-phase characteristic curve.
43. The display device of claim 32, wherein the display panel comprises a liquid crystal on silicon panel.
44. The display apparatus of claim 32, wherein the controller is configured to find a corresponding gamma setting information from a lookup table as the gamma setting according to the humidity information and the temperature information.
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