TWI553606B - Correction Method and Display Apparatus - Google Patents

Description

Correction method and display device

The invention relates to a calibration method and a display device, in particular to a method for correcting and compensating for the display brightness of a defect on a display device.

In order to facilitate the user to carry around, the weight and size of the mobile electronic device have become the most important consideration for the user. The development of the narrow-frame mobile electronic device has become a popular type in the market, and in order to realize the narrow-frame mobile electronic device, Corresponding to the gate drive circuit substrate technology (Gate or Array, GAO) to drive the display device, and the gate drive circuit is placed on the glass substrate of the display device to reduce the required design area and the relevant trace settings.

However, the use of non-single-crystal germanium to form a gate drive circuit is prone to process stability, uniformity, or reliability problems, and display devices using gate drive circuit substrate technology often have horizontal line defects in certain pixel units. Problems and led to a decline in the production yield of related products. In order to solve this problem, the conventional method can only start from the manufacturing process, material, equipment or quality control of the display device, so as to effectively maintain the production yield of the display device. Once the pixel unit of the display device has a horizontal line defect, it may include some display devices with less serious horizontal line defects, but the hardware conditions of the display devices cannot meet the needs of the client, which will result in The display device can only be discarded and cannot be recycled for reuse, thereby causing waste of costs.

Therefore, it has become an important subject in the art to provide a method of correcting and compensating for the display brightness of a defect on a display device.

Accordingly, it is a primary object of the present invention to provide a method of correcting and compensating for display brightness at a defect on a display device.

The invention discloses a correction method for correcting display brightness of a display device, the correction method comprising determining whether there is at least one correction area on a display panel of the display device; and determining that the display panel has the at least one correction And performing a compensation operation to match the display brightness in the at least one correction area to the preset brightness according to the difference between the display brightness of the at least one correction area and a preset brightness.

The present invention further discloses a display device including a processor for generating a control signal, a display panel coupled to the processor, and including a plurality of pixel units, and a storage device coupled to the processor. And storing a code for correcting display brightness of one of the plurality of pixel units according to the control signal, the display method comprising: determining whether there is at least one correction area on the display panel; and determining whether the display panel is on the display panel The at least one correction area is subjected to a compensation operation to match the display brightness to the preset brightness according to the difference between the display brightness of the correction area and a predetermined brightness.

Certain terms are used throughout the description and following claims to refer to particular elements. It should be understood by those of ordinary skill in the art that manufacturers may refer to the same elements by different nouns. The scope of this specification and the subsequent patent application do not use the difference of the names as the means for distinguishing the elements, but the differences in the functions of the elements as the basis for the distinction. The term "including" as used throughout the specification and subsequent claims is an open term and should be interpreted as "including but not limited to". In addition, the term "coupled" is used herein to include any direct and indirect electrical connection. Therefore, if a first device is coupled to a second device, it means that the first device can be directly connected to the second device or indirectly connected to the second device through other devices or connection means.

Please refer to FIG. 1 , which is a schematic diagram of a display device 10 according to an embodiment of the present invention. As shown in FIG. 1 , the display device 10 of the present embodiment includes a processor 100 , a display panel 102 , and a storage device 104 . Preferably, the processor 100 in this embodiment can integrate the functions of a central processing unit and/or an image processor, and is coupled with the display panel 102 and the storage device 104, and transmits related control signals and display materials. The display panel 102 and the storage device 104 are configured to provide a clock signal and a display signal. The display panel 102 includes a plurality of pixel units, and the control signal of the processor 100 can display or play a display data. The storage device 104 stores a code, and the code can be operated according to the control signal of the processor 100 to correct the display brightness of one of the plurality of pixel units on the display panel 102. Accordingly, when the manufacturer or product user finds that at least one horizontal line defect has appeared in one or more pixel units of the display panel 102 of the display device 10, a correction method provided by the embodiment may be used to correct the corresponding The display brightness of the pixel unit corresponding to at least one horizontal line defect to restore the normal display operation of the display device 10.

Notably, this embodiment does not limit the mobile electronic products used to carry the display device 10, or the display device 10 itself can perform independent operations. In other words, according to different needs of users or product designers, this embodiment The display device 10 can be operated as an accessory device and integrated in an electronic product (for example, a mobile phone, a tablet device, a wearable electronic product, or a notebook computer) to increase the application range of the electronic product. 10 is also an electronic system (for example, a liquid crystal display) and is coupled to an electronic computing system (for example, a personal computer or a multimedia device) and provides a display operator when the two support each other.

Further, the calibration method applicable to the display device 10 of the present embodiment can be summarized into a calibration process 20, and is compiled into a code and stored in the storage device 104. As shown in FIG. 2, the calibration process 20 includes the following steps.

Step 200: Start.

Step 202: Determine whether there is at least one correction area on the display panel 102.

Step 204: If it is determined that there is at least one correction area on the display panel 102, according to the difference between the display brightness of the correction area and a preset brightness, a compensation operation is performed to make the display brightness conform to the preset brightness.

Step 206: End.

After the user initiates the display operation of the display device 10, the product yield verification/quality control operation may be performed to initiate the calibration process 20 (ie, step 200). In step 202, the user can determine whether there is at least one correction area on the display panel 102 through a visual inspection method, that is, visually check whether the pixel unit of the display device 10 has a horizontal line defect. Of course, in another embodiment, the user can also detect or detect whether the pixel unit of the display device 10 has a horizontal line defect by using a detection module coupled to the display device 10. Further, the detecting module can be used to capture the display brightness of the plurality of pixel units on the display panel 102 to obtain the actual display brightness values of the pixel units for subsequent operations.

Preferably, the detection module in this embodiment can simultaneously refer to the comparison result of a Golden Sample to determine whether the at least one pixel unit of the display device 10 has a horizontal line defect. In other words, since the hardware device corresponding to the best sample (ie, another defect-free display device) is the best setting and excellent product, that is, the plurality of pixel units of the optimal sample does not contain the pixel unit with horizontal line defects. According to the problem, the user can simultaneously operate the display device 10 and the optimal sample on a plurality of gray scale values to obtain a first gray scale value distribution of the display device 10 and a second gray scale value distribution of one of the best samples. And the processor 100 of the display device 10 refers to the difference between the first grayscale value distribution and the second grayscale value distribution to determine whether there is at least one correction region on the display panel 102.

Further, when the processor 100 determines that the difference between the first grayscale value distribution and the second grayscale value distribution exceeds a predetermined value, the corresponding determination display device 10 includes at least one correction region (ie, at least one of the display devices 10). The pixel unit has a horizontal line defect problem). In this case, the calibration process 20 of the embodiment may perform a positioning operation and a classification operation on one or a plurality of pixel units in the at least one correction area to determine one or a plurality of horizontal line defects in the correction area. The unit is the severity of its actual defects and related information. Preferably, the positioning operation in this embodiment can determine that at least one correction area is located at an absolute position of the display panel 102, and the classification operation can determine that one or a plurality of pixel units in the at least one correction area is a clustering mode. Or a decentralized mode, that is, the classification operation will further determine whether the pixel units are zero-distributed or clustered. According to this, the processor 100 further collects the absolute position and classification information corresponding to one or a plurality of pixel units of the horizontal line defect in at least one correction area (ie, determining that the pixel units are in a cluster mode or a dispersion mode), For subsequent operations.

In step 204, if the processor 100 has determined that there is at least one correction area on the display panel 102, the processor 100 compares the difference between the display brightness of the pixel unit on the correction area and the preset brightness to perform a compensation operation. Make the display brightness match the preset brightness. Preferably, the processor 100 in this embodiment collects the absolute position and classification information of one or a plurality of pixel units with horizontal line defects in step 202 (ie, determines that the pixel units are in a cluster mode or a dispersion mode). And comparing the difference between the display brightness of the one or more pixel units of the horizontal line defect and the preset brightness to determine the manner in which the processor 100 will perform the compensation operation of the display panel 102, and let The display brightness of one or a plurality of pixel units of the horizontal line defect can be restored to an ideal preset brightness, thereby optimizing the display operation of the display device 10 and correspondingly improving the recycling efficiency of the product.

In detail, the compensation method in this embodiment includes performing a digital image operation, and the digital image operation includes mapping a pixel or a plurality of pixel units with respect to different gray scale values on at least one correction area. Or performing a brightness compensation operation or a color compensation operation for different color gamut spaces, so that the processor 100 can perform a digital image operation to match the display brightness in the at least one correction area to the preset brightness. Please refer to FIG. 3, which is a schematic diagram of a digital image operation in an embodiment of the present invention. As shown in FIG. 3, the left graph has drawn a solid line C2 to indicate an ideal transmittance corresponding to a normal plurality of pixel units operating under different gray scale values, and a broken line C1 indicates that the operation is performed on different grays. The actual penetration rate of one of the pixel units in the correction area under the order value. According to the comparison result of the two, it can be correspondingly found that the transmittance of the specific pixel unit having the horizontal line missing line in the correction area will be higher than the transmittance of the normal operation pixel unit, so that the specific area in the correction area The display brightness produced by the pixel unit is greater than the preset brightness of the normal operating pixel unit. In this case, the embodiment may perform corresponding digital image operations to map the original grayscale value (ie, the right graph C4 in the right image of FIG. 3) to the corrected grayscale value (ie, the other dotted line C3 in the right image of FIG. 3). ), the corrected gray scale value to be output after the adjustment is lower than the original gray scale value, so that the corrected one or more pixel units in the correction area can correspondingly display the normal preset brightness.

Please refer to FIG. 4, which is a schematic diagram of another digital image operation in the embodiment of the present invention. As shown in FIG. 4, if a plurality of grayscale values can correspond to a value ranging from 0 to 255, this embodiment can further simplify the modification of the operation mode of the embodiment of FIG. 3, that is, the corresponding amount for every 16 grayscale values. Measure the penetration rate corresponding to a grayscale value (such as the multiple measurement points on the dotted line C5 drawn in the left image in Figure 4) to appropriately reduce the execution cost required by the calibration method, while other unmeasured graying The transmittance corresponding to the order value can be obtained by the internal difference method. According to this, the complete broken line C5 drawn in the left figure of FIG. 4 can be obtained, and the other solid line C6 drawn in the left figure of FIG. 4 is The ideal transmittance corresponding to a normal plurality of pixel units under different gray scale values. In this case, according to the comparison result of the broken line C5 and the solid line C6, the transmittance of the specific pixel unit having the horizontal line missing line in FIG. 4 is higher than the transmittance of the normal operating pixel unit by 1.5 times. According to this, the digital image operation performed in this embodiment can map the original grayscale value (ie, the solid line C8 in the right picture of FIG. 4) to the corrected grayscale value (ie, the other broken line C7 in the right figure of FIG. 4). Therefore, the corrected gray scale value to be output after the adjustment is lower than the original gray scale value, so that the corrected one or more pixel units in the correction area can correspondingly display the normal preset brightness.

Of course, in other embodiments, if the display device 10 is verified to include other correction regions that need to be corrected/compensated, each correction region further includes a plurality of pixel units that have been determined. When there is a problem of the horizontal line missing line, and the horizontal line of the pixel units is different in weight, the processor 100 in this embodiment can further refer to and determine the absolute position corresponding to the plurality of pixel units. It is also within the scope of the present invention to classify information to apply different digital image operations of different correction/compensation methods to the pixel units to perform gray scale value mapping operators with different defect levels. paragraph.

In another embodiment, the digital image processing mode performed by the processor 100 can also perform a brightness compensation operation or a color compensation operation according to different color gamut spaces, for example, correcting and compensating operations for the RGB color gamut space, or Correction and compensation operations are performed in HSV, YCbCr or other gamut spaces. In addition, the embodiment does not limit the execution details of the correction and compensation operations. For example, the color brightness of each color in the above gamut space may be selected for correction and compensation operations, or only for specific parameters such as the brightness parameter V in the gamut space HSV. Correction and compensation operations are performed, and correction and compensation operations can also be performed for specific parameters in the gamut space YCbCr, such as the brightness parameter Y. Of course, other embodiments may also select correction and compensation operations for other parameters of a particular color gamut space, and are not intended to limit the scope of the present invention. Furthermore, since the visual perception of the human eye refers to the average value of a plurality of imaging parameters in the combined space, if the plurality of pixel units having horizontal line defects in the correction area are too close to each other, and the human eye is caused When the visual perception generates a discontinuity, in this case, the correction and compensation operations performed in this embodiment may also adjust the mapping curve corresponding to the pixel units to correspondingly perform interpolation/compensation of another curve. This also belongs to the scope of the invention.

In addition, the compensation method in this embodiment further includes performing a gamma compensation operation to obtain a gamma setting curve of a specific gray level value on at least one correction area, and using an analog gamma The compensating operation is such that the display brightness of one or a plurality of pixel units in at least one correction area coincides with the preset brightness. Please refer to FIG. 5, which is a schematic diagram of a gamma compensation operation according to an embodiment of the present invention. As shown in Fig. 5, the left diagram of the present embodiment depicts a broken line C5 similar to the left figure of Fig. 4 (i.e., a transmittance curve of a pixel unit to be subjected to correction and compensation operations) and a solid line C6 ( That is, the transmittance curve of the ideal pixel unit), that is, the transmittance of the specific pixel unit having the horizontal line missing line is 1.5 times higher than that of the normal operating pixel unit. Accordingly, the analog gamma compensation operation provided in this embodiment will refer to a voltage adjustment curve C9 drawn on the right side of FIG. 5 to appropriately adjust the voltage value of a specific pixel unit having a horizontal line missing line, thereby allowing The display brightness of the specific pixel unit having the horizontal line defect in the correction area can be adjusted to the preset brightness.

Please refer to FIG. 6A to FIG. 6C. FIG. 6A to FIG. 6C are schematic diagrams showing a compensation operation of a display screen according to an embodiment of the present invention. In this embodiment. 6A is a defect area DL1 generated in the center of a display screen, that is, for a Normally White display panel, the defect area DL1 represents that the pixel units are undercharged, and correspondingly, it is assumed to correspond to a Normally Black. For the display panel, the defective area DL1 represents that the pixel units are overcharged (or may also indicate that the pixel units at other positions on the display panel are undercharged). In this case, since the display luminance displayed by the pixel unit having the horizontal line defect is higher than the preset brightness, the present embodiment can adaptively pass the above various correction and compensation operations, and the horizontal line is missing in advance. The grayscale value of the pixel unit is appropriately adjusted (as shown in FIG. 6B) as a correction area DL2, and then the display screen after the correction and compensation operation is obtained (as shown in FIG. 6C), that is, the display screen will contain a normal picture. The display area DL3, that is, restores the display brightness of one or a plurality of pixel units in the correction areas on the display panel 102 to a preset brightness.

In other embodiments, if the pixel units of the horizontal line defects are in a cluster mode, and the display brightness of the pixel units deviates from the preset brightness by a fixed value, the correction of the embodiment is The compensation operation will judge that it only contains a single defective object, and further, it will refer to a coordinate range of one of the defective objects to perform corresponding correction and compensation operations; if the pixel elements of the horizontal line defects are in a decentralized mode, it is judged When a plurality of defective objects are included, the embodiment may also refer to the coordinate range of the defective objects recorded and the degree of defects included in the defective objects to perform the correction and compensation operations of the defective objects. Please refer to FIG. 7. FIG. 7 is a schematic diagram of a defect display screen 70 according to an embodiment of the present invention, wherein the defect display screen 70 includes a plurality of correction regions and each corresponds to a different defect degree. As shown in FIG. 7, since the defect display screen 70 already includes a plurality of correction regions corresponding to different defect levels, the processor 100 in this embodiment will correspondingly determine and record related information of a plurality of defective objects in the defect display screen 70. For the following Table 1, the coordinate range and the defect degree corresponding to the defective objects are clearly illustrated, and the processor 100 can further compare the difference between the display brightness of the pixel units of different defect levels and the preset brightness, Corresponding to the correction and compensation operations required to determine the pixel units of the defective objects, corresponding to different methods 1 to 3, and the detailed operation modes of the methods 1 to 3, for example, respectively, adjusting different gray scale values The mapping curve, the brightness compensation operation for different color gamut spaces, or the analog gamma compensation operation, etc., are not intended to limit the scope of the present invention. In other words, the present embodiment can perform different types of correction and compensation operations for a plurality of defective objects at the same time, so as to shorten the execution time and efficiency required for the correction process, and further cooperate with the design and application of different display devices. Table 1         <TABLE border="1" borderColor="#000000" width="_0005"><TBODY><tr><td> Defect object number</td><td> Starting position</td><td> Width< /td><td> Height of pixel unit</td><td> Compensation method</td></tr><tr><td> 1 </td><td> (200, 0) </td ><td> 480 </td><td> 1 </td><td> Method 1 </td></tr><tr><td> 2 </td><td> (400, 0) < /td><td> 480 </td><td> 10 </td><td> Mode 2 </td></tr><tr><td> 3 </td><td> (600, 0 ) </td><td> 480 </td><td> 2 </td><td> Method 3 </td></tr></TBODY></TABLE>

In short, the correction method for the display device 10 in this embodiment can correspondingly determine whether the display device 10 has a correction area for performing correction and compensation operations of the display brightness through the detection module and the visual inspection mode. If there is a correction area, the embodiment can appropriately determine the defect degree, absolute position and classification information of one or more pixel units in the correction area, so as to perform various types of digital image operations and/or analog gamma. The horse compensates for the operation until the display brightness of one of the horizontal line defects or the plurality of pixel units in the correction area is restored to the preset brightness and the display device 10 is caused to perform the normal display operation. Certainly, the calibration method for the display device 10 in this embodiment may also be independently presented by using a software, a firmware or a hardware, and correspondingly combined with other electronic hardware products or display software operations, etc., Limit the scope of the invention. In addition, those skilled in the art may also adapt the display operation performance or application range of the display device 10 to different visual environments by appropriately adding other types of optical image adjustment parameters or visual model adjustment parameters. Etc. also falls within the scope of the present invention.

In summary, the embodiments of the present invention provide a display device and a correction method for correcting and compensating a pixel unit having a horizontal line defect to appropriately adjust the display brightness of a pixel unit having a horizontal line defect. Accordingly, the embodiment can reduce the production cost by recovering the display devices with the horizontal line defects being less serious. On the other hand, the embodiment can also improve the service life of the electronic products carrying the display device, so as to correspondingly improve the electronic products. Product application range and hardware scalability. The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

10‧‧‧ display device
100‧‧‧ processor
102‧‧‧ display panel
104‧‧‧Storage device
20‧‧‧Display process
200, 202, 204, 206‧ ‧ steps
70‧‧‧ Defect display screen
C1, C3, C5, C7‧‧‧ dotted lines
C2, C4, C6, C8‧‧‧ solid line
C9‧‧‧ voltage adjustment curve
DL1‧‧‧ Defected area
DL2‧‧ ‧ calibration area
DL3‧‧‧Normal display area

FIG. 1 is a schematic diagram of a display device according to an embodiment of the present invention. FIG. 2 is a flow chart of a calibration process according to an embodiment of the present invention. FIG. 3 is a schematic diagram of a digital image operation in an embodiment of the present invention. FIG. 4 is a schematic diagram of another digital image operation in the embodiment of the present invention. Figure 5 is a schematic diagram of a type of gamma compensation operation in an embodiment of the present invention. 6A to 6C are schematic diagrams showing a compensation operation of a display screen in the embodiment of the present invention. FIG. 7 is a schematic diagram showing a defect display screen in the embodiment of the present invention.

20‧‧‧ Calibration process

200, 202, 204, 206‧ ‧ steps

Claims (10)

A calibration method for correcting display brightness of a display device, the correction method comprising: determining whether at least one correction area is displayed on a display panel of the display device; and determining that the display panel has the at least one correction area, And performing a compensation operation to match the display brightness in the at least one correction area to the preset brightness according to the difference between the display brightness of the at least one correction area and a preset brightness; wherein determining the display device The step of displaying the at least one calibration area on the display panel comprises: using a detection module to capture the display brightness; and operating the display device and the optimal sample according to a best sample (Golden Sample) Obtaining a first gray scale value distribution of one of the display devices and a second gray scale value distribution of the one of the optimal samples, and further referring to the first gray scale value distribution and the second gray scale value The difference between the distributions determines whether the at least one correction area is present on the display panel. The method of claim 1, wherein determining the difference between the first grayscale value distribution and the second grayscale value distribution to determine whether there is the at least one correction region further comprises: if the first When the difference between the grayscale value distribution and the second grayscale value distribution exceeds a predetermined value, determining that the display device has the at least one correction region; and performing one positioning operation and a classification operation corresponding to the at least one correction region . The method of claim 2, wherein the positioning operation determines that the at least one correction area is located at an absolute position of the display panel, and the classification operation determines the at least one correction area The plurality of pixel units are a cluster mode or a dispersion mode. The method of claim 1, wherein the compensation method comprises performing a digital image operation, the digital image operation comprising: mapping a curve with respect to one of different grayscale values on the at least one correction region, for different colors The field space performs a brightness compensation operation or a color compensation operation, and the digital image operation is used to match the display brightness in the at least one correction area to the preset brightness. The calibration method of claim 1, wherein the compensation method comprises performing an analog gamma compensation operation to obtain a gamma setting curve of a specific grayscale value on the at least one correction region, and using the The analog gamma compensation operation operates to match the display brightness in the at least one correction area to the preset brightness. A display device includes: a processor for generating a control signal; a display panel coupled to the processor and including a plurality of pixel units; and a storage device coupled to the processor and stored Having a code, the code corrects display brightness of one of the plurality of pixel units according to the control signal, the display method includes: determining whether there is at least one correction area on the display panel; and determining that the display panel has The at least one correction area performs a compensation operation to match the display brightness to the preset brightness according to the difference between the display brightness of the correction area and a preset brightness; wherein the display method determines the display panel Whether there is at least one correction area step includes: Using a detection module to capture the display brightness, wherein the detection module is coupled to the display device; and operating the display device and the optimal sample in a plurality of measurements according to an optimal sample (Golden Sample) Obtaining a first gray scale value distribution of one of the display devices and a second gray scale value distribution of the one of the optimal samples, and determining the first gray scale value distribution and the second gray scale value distribution The difference is used to determine whether there is at least one correction area. The display device of claim 6, wherein the step of determining the difference between the first grayscale value distribution and the second grayscale value distribution to determine whether there is the at least one correction region is further included in the display method, further comprising: If the difference between the first grayscale value distribution and the second grayscale value distribution exceeds a predetermined value, determining that the display device has the at least one correction region; and performing one of the positioning operations corresponding to the at least one correction region Operate with a classification. The display device of claim 7, wherein the positioning operation determines that the at least one correction area is located at an absolute position of the display panel, and the classification operation determines that the plurality of pixel units in the at least one correction area is a Cluster mode or a decentralized mode. The display device of claim 6, wherein the compensation method comprises performing a digital image operation, the digital image operation comprising: mapping a curve with respect to one of different grayscale values on the at least one correction region, for different colors The field space performs a brightness compensation operation or a color compensation operation, and the digital image operation is used to match the display brightness in the at least one correction area to the preset brightness. The display device of claim 6, wherein the compensation method comprises performing an analog gamma compensation operation to obtain a gamma setting curve of a specific grayscale value on the at least one correction region, and using the The analog gamma compensation operation operates to match the display brightness in the at least one correction area to the preset brightness.