Method for respectively adjusting different-frequency VCOM (Virtual Component Object Model) of high-PPI HDM flicker

Abstract

The invention discloses a method for respectively adjusting different-frequency VCOM (Virtual Component Object Model) flickering of a high-PPI HDM (High-Density Multiplex Model), which is characterized by comprising the following steps of: adjusting a VCOM value of a flickering picture under 90Hz, confirming an optimal VCOM value and recording the VCOM value; power-off and power-on are switched to flicker images under 72 Hz, the VCOM value is adjusted for the second time, and an optimal VCOM value record is made; an optimal VCOM balance value of 72Hz and 90Hz is calculated by using an algorithm, and a VCOM value is recorded; the three VCOM values are respectively written into registers corresponding to the IC in an OTP mode; and according to different scenes of the whole machine, the optimal VCOM values with different corresponding frequencies are automatically switched for coverage. According to the method, on the basis of the existing material and process level of the high PPILCD of the HMD item, the optimal VCOM adjustment is performed by integrating the flicker characteristics of different frequencies and different frequencies, and the optimal VCOM adjustment is completely written into the IC, and a client performs automatic switching according to different use scenes and can autonomously select a proper application mode in combination with related flicker display evaluation results.

Description

Technical Field

[0001] The present invention relates to the field of liquid crystal panels, and in particular to a method for respectively adjusting different frequencies VCOM of high PPI HDM flashing. Background Art

[0002] HMD is also known as wearable head-mounted display. HMD is very sensitive to flicker, so new projects generally have higher requirements for flicker. In order to reduce the screen door effect (the degree to which the black BM around the pixels is visible to the naked eye), higher requirements are placed on the PPI of the display screen (currently reaching 1200+, and there is a need for further improvement).

[0003] In order to increase comfort and reduce battery weight as much as possible, the HMD project uses different refresh rates (60-120Hz) for different application scenarios to effectively control the power consumption of the entire device. The particularity of the experience mode of the HMD project (close distance) has high requirements for flicker, and different refresh rates need to meet customer specifications.

[0004] The main problem is that the size of the charging capacitor corresponding to the high PPI LCD is smaller, resulting in poorer charging and charge retention capabilities than mobile phone projects, and the traditional one-time VCOM burning method cannot meet the specification requirements of all frequencies. Figure 1 In the data in Table 1, taking the 1200+PPI project 72&90Hz as an example, the optimal values ​​corresponding to the two frequencies differ by 3-5 grids. Figure 2 From the data in Table 2, if the optimal VCOM deviation exceeds 3 steps, it may not meet the specification of -30dB. The traditional adjustment method with a frequency of 72Hz or 90Hz may not meet customer specifications. Summary of the invention

[0005] In view of the problems mentioned in the background technology, an object of the present invention is to provide a method for separately adjusting different frequencies VCOM of high PPI HDM flashing, so as to solve the problems mentioned in the background technology.

[0006] The above technical objectives of the present invention are achieved through the following technical solutions:

[0007] A method for adjusting different VCOM frequencies of high PPI HDM flashing respectively comprises the following steps:

[0008] Adjust the VCOM value when the screen flickers at 90Hz, confirm the best VCOM value and keep a record of the VCOM value;

[0009] Power off and then on again to switch to 72Hz flashing screen, adjust VCOM value for the second time, and make a record of the best VCOM value;

[0010] Use the algorithm to calculate the best VCOM balance value of 72Hz and 90Hz, and keep a record of the VCOM value;

[0011] Write the above three VCOM values ​​into the corresponding registers of IC through OTP respectively;

[0012] Automatically switch the optimal VCOM value of the corresponding frequency to cover different scenarios of the whole machine.

[0013] Preferably, the register is a digital register or a shift register.

[0014] Preferably, adjust the VCOM value when the image flickers at 90Hz. When confirming the best VCOM value, adjust VCOM and choose the best value based on the image effect.

[0015] Preferably, when using the algorithm to calculate the optimal VCOM balance value of 72Hz and 90Hz, take the average of the two endpoint Vcom values ​​as the test Vcom value, and obtain the test flicker value of the LCD screen under the test Vcom value; determine whether the test Flicker value is less than the preset threshold Flicker value; if so, determine that the test Vcom value is the optimal Vcom value of the LCD screen; if not, take one of the two endpoint Vcom values ​​and the test Vcom value as the new two endpoint Vcom values, and take the flat value as the optimal VCOM value.

[0016] Preferably, the register is connected to a cloud storage module, and the cloud storage module is connected to a cloud platform terminal.

[0017] In summary, the present invention mainly has the following beneficial effects:

[0018] Based on the existing materials and process level of high PPI LCD, the HMD of the present invention integrates the flicker characteristics of different frequencies, makes the best VCOM adjustment for different frequencies and writes all of them into the IC, and customers can automatically switch according to different usage scenarios. In addition, the third balanced value customer can also use the traditional VCOM usage method for customers. Customers can independently select the appropriate application method based on the relevant flicker display evaluation results. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the best VCOM difference chart for 72 / 90Hz;

[0020] Figure 2 This is the flicker value chart corresponding to the optimal VCOM value ±5 steps;

[0021] Figure 3 The optimum VCOM values ​​for all three adjustments meet the 72 / 90Hz customer -30dB specification chart. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] refer to Figures 1 to 3 , a method for adjusting different VCOM frequencies of high PPI HDM flashing respectively, comprising the following steps:

[0024] Adjust the VCOM value when the screen flickers at 90Hz, confirm the best VCOM value and keep a record of the VCOM value;

[0025] Power off and then on again to switch to 72Hz flashing screen, adjust VCOM value for the second time, and make a record of the best VCOM value;

[0026] Use the algorithm to calculate the best VCOM balance value of 72Hz and 90Hz, and keep a record of the VCOM value;

[0027] Write the above three VCOM values ​​into the corresponding registers of IC through OTP respectively;

[0028] Automatically switch the optimal VCOM value of the corresponding frequency to cover different scenarios of the whole machine.

[0029] refer to Figures 1 to 3 , wherein the register is a digital register or a shift register; wherein the VCOM value is adjusted for the flickering picture at 90Hz, and when the best VCOM value is confirmed, the best value is selected according to the image effect by adjusting VCOM; wherein when the algorithm is used to calculate the balance value of the best VCOM of 72Hz and 90Hz, the average value of the two endpoint Vcom values ​​is taken as the test Vcom value, and the test flicker degree value of the liquid crystal display under the test Vcom value is obtained; it is determined whether the test Flicker value is less than the preset threshold Flicker value; if so, the test Vcom value is determined to be the best Vcom value of the liquid crystal display; if not, one of the two endpoint Vcom values ​​and the test Vcom value are taken as the new two endpoint Vcom values, and the flat value is taken as the best VCOM value.

[0030] refer to Figures 1 to 3, wherein the register is connected to a cloud storage module, and the cloud storage module is connected to a cloud platform terminal; based on the existing materials and process levels of the HMD project high PPI LCD, the flicker characteristics of different frequencies are comprehensively considered, and the optimal VCOM adjustment is made for different frequencies and all are written into the IC, and the customer automatically switches according to different usage scenarios. In addition, the third balanced value customer can also apply the traditional VCOM usage method for customers. Customers can independently select the appropriate application method based on the relevant flicker display evaluation results.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for adjusting VCOM of different frequencies of HDM flashing with high PPI respectively, characterized in that: The following steps are involved: Adjust the VCOM value when the screen flickers at 90Hz, confirm the best VCOM value and keep a record of the VCOM value; Power off and then on again to switch to 72Hz flashing screen, adjust VCOM value for the second time, and make a record of the best VCOM value; Use the algorithm to calculate the best VCOM balance value of 72Hz and 90Hz, and keep a record of the VCOM value; Write the above three VCOM values ​​into the corresponding registers of IC through OTP respectively; Automatically switch the optimal VCOM value of the corresponding frequency to cover different scenarios of the whole machine.

2. The method for adjusting VCOM of different frequencies of high PPI HDM flashing according to claim 1, characterized in that: The register is a digital register or a shift register.

3. The method for adjusting VCOM of different frequencies of high PPI HDM flashing according to claim 1, characterized in that: Adjust the VCOM value when the screen flickers at 90Hz. When confirming the best VCOM value, adjust VCOM and choose the best value based on the image effect.

4. The method for adjusting VCOM of different frequencies of high PPI HDM flashing according to claim 1, characterized in that: When using the algorithm to calculate the optimal VCOM balance value of 72Hz and 90Hz, take the average value of the two endpoint Vcom values ​​as the test Vcom value, and obtain the test flicker value of the LCD screen under the test Vcom value; determine whether the test Flicker value is less than the preset threshold Flicker value; if so, determine that the test Vcom value is the optimal Vcom value of the LCD screen; if not, take one of the two endpoint Vcom values ​​and the test Vcom value as the new two endpoint Vcom values, and take the flat value as the optimal VCOM value.

5. The method for adjusting VCOM of different frequencies of high PPI HDM flashing according to claim 1, characterized in that: The register is connected to a cloud storage module, and the cloud storage module is connected to a cloud platform terminal.

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