High PPI HDM flicker adjustment process

Abstract

The invention discloses a high PPI HDM flicker adjustment process, and the key points of the technical scheme are that the high PPI HDM flicker adjustment process comprises the following steps: utilizing a PWM output signal of an IC body to be linked with a backlight driving chip, carrying out the expression control of an LCD module, and outputting a duty backlight control signal which is the same as a client mainboard; whether the backlight duty ratio meets the set specification or not is determined through a jig duty ratio checking loop; whether the LED loop has open circuit and short circuit conditions or not is confirmed through the voltage checking loop; after the related confirmation is OK, the signal source is automatically switched to a flicker adjustment picture; after the flicker picture is represented, the CA410 is linked to capture a flicker curve after a short time, and a VCOM setting parameter corresponding to the minimum flicker value is recorded; and after optical parameter adjustment, the recorded VCOM value is subjected to OTP burning. On the basis of the existing material and process level of the LCD, the characteristics of the flicker are considered, the use scene of an HMD project is effectively combined, the flicker value is obviously increased, and the specification requirements of customers are met.

Description

Technical Field

[0001] The invention relates to the field of liquid crystal panels, and in particular to a high PPI HDM flicker adjustment process. 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] The pixel size corresponding to high PPI LCD will become smaller, and the smaller the pixel, the smaller the size of the charging capacitor, and the corresponding flicker value will become worse. The traditional flicker adjustment results of the 1200+ppi project are confirmed to not meet customer specifications, and due to the limitations of existing technology and process of process and materials, it is difficult to increase the capacity of the charging capacitor in the short term for 1200+ppi, and related changes will reduce the yield of the LCD screen. Summary of the invention

[0004] In view of the problems mentioned in the background technology, an object of the present invention is to provide a high PPI HDM flicker adjustment process to solve the problems mentioned in the background technology.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A process for adjusting HDM flicker with high PPI, comprising the following steps:

[0007] Use the IC's built-in PWM output signal to link the backlight driver chip to control the LCD module display and output the same duty backlight control signal as the customer's mainboard;

[0008] Use the jig duty cycle check circuit to confirm whether the backlight duty ratio meets the set specifications;

[0009] Check the voltage circuit to see if the LED circuit is open or short-circuited;

[0010] After the relevant confirmation is OK, the signal source automatically switches to the flashing adjustment screen;

[0011] After the flickering screen is displayed, after a short period of time, the CA410 is linked to capture the flickering curve and the VCOM setting parameters corresponding to the lowest flickering value are recorded;

[0012] After adjusting the optical parameters, the recorded VCOM value is burned into the OTP;

[0013] After OTP burning, power off and then on, and the flashing screen will be displayed to read the OTP burning parameters and make a judgment.

[0014] Preferably, after the flickering image is displayed, a flickering curve is captured after a short period of time or by optical exploration, and the VCOM setting parameter corresponding to the minimum flickering value is recorded.

[0015] Preferably, the duty backlight control signal is sent by a duty module, which receives a PWM signal transmitted from a display driver chip CABC module, calculates its duty value and a gate threshold Y with a duty value preset in advance, and when it is calculated that the duty value of the PWM signal transmitted from the display driver chip CABC module is lower than the gate threshold Y, the control signal is transmitted to the backlight driver IC module through a data transmission protocol to reduce the screen brightness.

[0016] Preferably, when recording the VCOM setting parameters corresponding to the minimum flicker value, a storage recording module is used to record the VCOM setting parameters, and an encryption module is used to encrypt the data.

[0017] Preferably, the setting of OTP burning includes the following steps: setting OTP key settings, lighting the module, obtaining RAW image, obtaining AWB data, AWB data checking, LSC data checking, OTP burning, and OTP checking.

[0018] In summary, the present invention mainly has the following beneficial effects:

[0019] Based on the existing materials and process level of LCD, the present invention considers the characteristics of flicker and effectively combines the use scenario of HMD project to significantly improve the flicker value and meet the customer's specification requirements. To avoid the high incidence of other defects caused by traditional flicker changes in LCD screen design and lead to a decrease in yield, the current DC backlight mode is changed to a duty 10% setting, and the flicker data is improved to meet the customer's specification requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Adjust the DC mode graph for normal flicker;

[0021] Figure 2 Adjusted Duty mode graph for new flashes;

[0022] Figure 3 Comparison of VCOM values ​​in DC / Duty10% mode. DETAILED DESCRIPTION

[0023] 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.

[0024] refer to Figures 1 to 3 , a process for high PPI HDM flicker adjustment, comprising the following steps:

[0025] Use the IC's built-in PWM output signal to link the backlight driver chip to control the LCD module display and output the same duty backlight control signal as the customer's mainboard;

[0026] Use the jig duty cycle check circuit to confirm whether the backlight duty ratio meets the set specifications;

[0027] Check the voltage circuit to see if the LED circuit is open or short-circuited;

[0028] After the relevant confirmation is OK, the signal source automatically switches to the flashing adjustment screen;

[0029] After the flickering screen is displayed, after a short period of time, the CA410 is linked to capture the flickering curve and the VCOM setting parameters corresponding to the lowest flickering value are recorded;

[0030] After adjusting the optical parameters, the recorded VCOM value is burned into the OTP;

[0031] After OTP burning, power off and then on, and the flashing screen will be displayed to read the OTP burning parameters and make a judgment.

[0032] refer to Figures 1 to 3 After the flickering image is displayed, a flickering curve is captured after a short period of time or by optical exploration, and the VCOM setting parameter corresponding to the minimum flickering value is recorded.

[0033] refer to Figures 1 to 3 The duty backlight control signal is sent by the duty module. The duty module receives the PWM signal transmitted by the display driver chip CABC module, and calculates its duty value and a gate threshold Y with a preset duty value. When it is calculated that the duty value of the PWM signal transmitted by the display driver chip CABC module is lower than the gate threshold Y, the control signal is transmitted to the backlight driver IC module through the data transmission protocol to reduce the screen brightness.

[0034] refer to Figures 1 to 3When recording the VCOM setting parameters corresponding to the minimum flicker value, a storage recording module is used to record the VCOM setting parameters, and an encryption module is used to encrypt the data.

[0035] refer to Figures 1 to 3 The OTP burning setting includes the following steps: setting OTP key settings, lighting the module, obtaining RAW images, obtaining AWB data, AWB data checking, LSC data checking, OTP burning, and OTP checking.

[0036] refer to Figures 1 to 3 Based on the existing materials and process level of LCD, the present invention considers the characteristics of flicker and effectively combines the use scenario of HMD project to significantly improve the flicker value and meet the customer's specification requirements. To avoid the high incidence of other defects caused by traditional flicker changes in LCD screen design and lead to a decrease in yield, the current DC backlight mode is changed to a duty 10% setting, and the flicker data is improved to meet the customer's specification requirements.

[0037] 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 process for high PPI HDM flicker adjustment, characterized by: The following steps are involved: Use the IC's built-in PWM output signal to link the backlight driver chip to control the LCD module display and output the same duty backlight control signal as the customer's mainboard; Use the jig duty cycle check circuit to confirm whether the backlight duty ratio meets the set specifications; Check the voltage circuit to see if the LED circuit is open or short-circuited; After the relevant confirmation is OK, the signal source automatically switches to the flashing adjustment screen; After the flickering screen is displayed, after a short period of time, the CA410 is linked to capture the flickering curve and the VCOM setting parameters corresponding to the lowest flickering value are recorded; After adjusting the optical parameters, the recorded VCOM value is burned into the OTP; After OTP burning, power off and then on, and the flashing screen will be displayed to read the OTP burning parameters and make a judgment.

2. A high PPI HDM flicker adjustment process according to claim 1, characterized in that: After the flickering image is displayed, a flickering curve is captured after a short period of time or by optical exploration, and the VCOM setting parameter corresponding to the minimum flickering value is recorded.

3. A high PPI HDM flicker adjustment process according to claim 1, characterized in that: The duty backlight control signal is sent by the duty module, and the duty module receives the PWM signal transmitted by the display driver chip CABC module, calculates its duty value and a gate threshold Y with a duty value preset in advance, and when it is calculated that the duty value of the PWM signal transmitted by the display driver chip CABC module is lower than the gate threshold Y, the control signal is transmitted to the backlight driver IC module through the data transmission protocol to reduce the screen brightness.

4. A high PPI HDM flicker adjustment process according to claim 1, characterized in that: When recording the VCOM setting parameters corresponding to the minimum flicker value, a storage and recording module is used to record the VCOM setting parameters, and an encryption module is used to encrypt the data.

5. A high PPI HDM flicker adjustment process according to claim 4, characterized in that: The OTP burning setting includes the following steps: setting OTP key settings, lighting the module, obtaining RAW images, obtaining AWB data, AWB data checking, LSC data checking, OTP burning, and OTP checking.

Images