Gamma voltage adjusting device for TFT (Thin Film Transistor) display screen

Abstract

The utility model provides a TFT display screen Gamma voltage adjusting device which comprises a TFT screen, an optical sensor, a controller and a base, a positioning seat used for bearing the TFT screen is installed on the base, the optical sensor is installed on the base through a support, the optical sensor is located above the positioning seat, and the controller is installed in the base. According to the device, the cost can be reduced on the premise of realizing Gamma adjustment and correction, after the to-be-tested TFT screen is borne by the base, the TFT screen is controlled by the controller to alternately display a plurality of gray-scale pictures in sequence, the brightness data is collected by the light sensor, the controller acquires the Gamma voltage of the current screen according to the brightness data, and the Gamma voltage is adjusted and corrected. The Gamma voltage of the current screen is adjusted by the controller, whether the Gamma voltage of the current screen is in a preset range or not is judged, if the Gamma voltage of the current screen is not in the preset range, the controller adjusts the reference Gamma voltage parameter in the register, and therefore Gamma voltage adjustment is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of display voltage regulation, in particular to a TFT display screen Gamma voltage regulation device. Background Art

[0002] Gamma curve is an important parameter of LCD. The formula of Gamma curve of LCD can be expressed as (x / 255)^r=(Lx-Lmin) / (Lmax-Lmin), where x is grayscale level, r is gamma value, Lx is the brightness of the corresponding x grayscale picture, Lmax is the brightness of the white picture, and Lmin is the brightness of the black picture. Since the brightness that the human eye can recognize is not linearly related to the actual brightness, when the Gamma value of the LCD is 2.2, the human eye recognizes that the progression of each grayscale brightness is equidistant. Therefore, the Gamma curve characteristics have a great influence on the grayscale reproduction and color white balance of the LCD.

[0003] Under normal circumstances, the voltage of each grayscale level, i.e., the Gamma voltage, is set before the LCD display driver IC leaves the factory, so that the Gamma curve of the LCD display meets the standard of 2.2±0.3. However, due to fluctuations in the process, there will always be certain differences in the photoelectric parameters between different batches or different displays in the same batch. Therefore, the display needs to be tested and calibrated to improve product consistency.

[0004] The existing method of adjusting the Gamma voltage is generally to use an optical lens developed by a professional equipment manufacturer in combination with a color analyzer to capture the image, and then perform Gamma correction. This adjustment method requires a high cost to purchase professional equipment, and the cost of using these equipment in production is too high. Utility Model Content

[0005] In order to overcome the problems existing in the related art, the utility model provides a TFT display screen Gamma voltage adjustment device, so as to reduce the cost under the premise of being able to achieve Gamma adjustment and correction.

[0006] The purpose of the utility model is to provide a TFT display screen Gamma voltage adjustment device, comprising:

[0007] A TFT screen having a register for storing a reference Gamma voltage;

[0008] Light sensor, used to obtain brightness data corresponding to different images of the TFT screen;

[0009] The controller is respectively connected to the light sensor and the TFT screen for obtaining the Gamma voltage of the current screen of the TFT screen according to the brightness data, driving the TFT screen to switch the screen, and adjusting the reference Gamma voltage parameter in the register according to the Gamma voltage of the current screen;

[0010] A base, a positioning seat for carrying a TFT screen is installed on the base, the light sensor is installed on the base via a bracket, the light sensor is located above the positioning seat, the controller is installed in the base, and a power-on interface, a power-on switch, a test button, and a screen connection port are provided on the base. The power-on interface, the power-on switch, and the test button are all electrically connected to the controller through wires, and the screen connection port is connected to the TFT screen via a connecting line.

[0011] In the preferred technical solution of the utility model, it also includes:

[0012] The host computer is a computer, which is connected to the controller for acquiring and storing the test data of the TFT screen. The base is provided with a communication interface, and the controller is connected to the host computer via the communication interface.

[0013] In the preferred technical solution of the utility model, it also includes:

[0014] The barcode scanner is connected to the host computer for scanning the label on the TFT screen to obtain the product serial number so that the host computer can bind the test data corresponding to the product serial number.

[0015] In a preferred technical solution of the present utility model, the label is a barcode or a QR code recording product information.

[0016] In a preferred technical solution of the utility model, a power conversion module is installed in the base, and the power interface is connected to the controller via the power conversion module.

[0017] In a preferred technical solution of the utility model, an interface conversion module is installed in the base, and the host computer is connected to the controller via the interface conversion module.

[0018] In a preferred technical solution of the utility model, an indicator light is installed on the base, and the indicator light is connected to the controller. When the host computer and the controller complete the communication connection, the indicator light lights up.

[0019] In a preferred technical solution of the utility model, the positioning seat includes a movable plate that slides with the base along the first horizontal direction and a positioning support block for supporting the four corners of the TFT display, and the positioning support block is provided with a notch for accommodating the corners of the TFT display;

[0020] Two positioning support blocks are arranged on each movable plate, and the positioning support blocks are slidably matched with the movable plate along the second horizontal direction;

[0021] The first horizontal direction is perpendicular to the second horizontal direction.

[0022] In a preferred technical solution of the utility model, two longitudinal slide rails are symmetrically arranged on the base, and the movable plate is slidably mounted on the longitudinal slide rails;

[0023] The movable plate is provided with a transverse slide rail, and the positioning support block is slidably mounted on the transverse slide rail.

[0024] In a preferred technical solution of the utility model, a first locking member is installed on the movable plate for locking the movable plate and the longitudinal slide rail;

[0025] The positioning support block is provided with a second locking member for locking the positioning support block and the transverse slide rail.

[0026] Preferably, the first locking member and the second locking member are both locking nails.

[0027] The beneficial effects of the utility model are:

[0028] The structure is simple and easy to operate. It can reduce costs while achieving Gamma adjustment and correction. After the TFT screen to be tested is carried by the base, the controller controls the TFT screen to alternately display multiple grayscale images in sequence, and uses the light sensor to collect brightness data. The controller obtains the Gamma voltage of the current screen according to the brightness data, and determines whether the Gamma voltage of the current screen is within the preset range. If the Gamma voltage of the current screen is not within the preset range, the controller adjusts the reference Gamma voltage parameters in the register to achieve Gamma voltage adjustment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is the electrical schematic diagram of the Gamma voltage adjustment device for the TFT display.

[0030] Figure 2 It is a structural diagram of the Gamma voltage adjustment device of the TFT display.

[0031] Figure 3 It is a structural schematic diagram of the positioning seat.

[0032] Reference numerals:

[0033] 100, TFT screen; 200, controller; 210, power conversion module; 220, indicator light; 230, interface conversion module; 240, power switch; 250, test button; 300, light sensor; 400, host computer; 500, barcode scanner; 600, base; 700, bracket; 800, positioning seat; 810, longitudinal slide rail; 820, moving plate; 830, transverse slide rail; 840, positioning support block. DETAILED DESCRIPTION

[0034] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0035] Gamma curve is an important parameter of liquid crystal display. Under normal circumstances, the voltage of each gray scale, i.e. Gamma voltage, is set before the LCD display driver IC leaves the factory, so that the Gamma curve of the liquid crystal display meets the standard of 2.2±0.3. However, due to the fluctuation of process technology, there will always be certain differences in the photoelectric parameters between different batches or different display screens in the same batch. Therefore, it is necessary to detect and calibrate the display screen to improve the consistency of the product. The existing method of adjusting Gamma voltage is generally to use an optical lens developed by a professional equipment manufacturer to capture the picture with a color analyzer, and then perform Gamma correction. This adjustment method requires a high cost to purchase professional equipment, and the cost of using these equipment in production is too high.

[0036] Example

[0037] In view of the above problems, this embodiment provides a TFT display screen Gamma voltage adjustment device to reduce the cost while achieving Gamma adjustment and correction.

[0038] like Figure 1-3 As shown, a TFT display screen Gamma voltage adjustment device comprises:

[0039] A TFT screen having a register for storing a reference Gamma voltage;

[0040] The light sensor is used to obtain the brightness data corresponding to different pictures of the TFT screen. Specifically, the pictures include grayscale pictures, white pictures and black pictures;

[0041] The controller is respectively connected to the light sensor and the TFT screen for communication, and is used to obtain the Gamma voltage of the current screen of the TFT screen according to the brightness data, drive the TFT screen to switch the screen, and adjust the reference Gamma voltage parameter in the register according to the Gamma voltage of the current screen. For example, the controller model is stm32f429igt6;

[0042] A base, a positioning seat for carrying a TFT screen is installed on the base, the light sensor is installed on the base via a bracket, the detection end of the light sensor faces the base, the light sensor is located above the positioning seat, the controller is installed in the base, and a power-on interface, a power-on switch, a test button, and a screen connection port are provided on the base. The power-on interface, the power-on switch, and the test button are all electrically connected to the controller through wires, and the screen connection port is connected to the TFT screen via a connecting line.

[0043] In this embodiment, it also includes:

[0044] The host computer is a computer, which is connected to the controller for acquiring and storing the test data of the TFT screen. The base is provided with a communication interface, and the controller is connected to the host computer via the communication interface.

[0045] In this embodiment, it also includes:

[0046] The barcode scanner is connected to the host computer for scanning the label on the TFT screen to obtain the product serial number so that the host computer can bind the test data corresponding to the product serial number.

[0047] In this embodiment, the label is a barcode or a QR code recording product information.

[0048] Specifically, the steps are as follows:

[0049] S1: Scan the label on the TFT screen with a barcode scanner to obtain the product serial number;

[0050] S2: Install the TFT screen on the base and connect the TFT screen to the screen connection port;

[0051] S3: Connect the power interface to the power supply, press the power switch, and start the TFT screen;

[0052] S4: Press the test button, the controller controls the TFT screen to alternately display multiple images (the multiple images include at least one grayscale image, one white image, and one black image), and at the same time the light sensor collects brightness data and transmits the brightness data to the controller;

[0053] S5: The controller obtains the Gamma voltage of the current screen according to the brightness data;

[0054] S7: The controller checks whether the current screen Gamma voltage is within a preset range;

[0055] If the current screen Gamma voltage is not within the preset range, the controller adjusts the reference Gamma voltage parameter in the register and repeats steps S4-S7 to continue the test. It should be noted that there is no need to press the test button again at this time.

[0056] If the current screen's Gamma voltage is within the preset range, the test is completed and the controller turns off the TFT screen;

[0057] S8: After the test is completed, the host computer obtains the test data of the tested TFT screen and stores it after binding it with the product serial number.

[0058] The device has a simple structure and is easy to operate and use. It can reduce costs while achieving Gamma adjustment and correction. After the TFT screen to be tested is carried by the base, the controller controls the TFT screen to alternately display multiple grayscale images in sequence, and uses the light sensor to collect brightness data. The controller obtains the Gamma voltage of the current screen according to the brightness data, and determines whether the Gamma voltage of the current screen is within a preset range. If the Gamma voltage of the current screen is not within the preset range, the controller adjusts the reference Gamma voltage parameters in the register to achieve Gamma voltage adjustment.

[0059] In this embodiment, a power conversion module is installed in the base, and the power interface is connected to the controller via the power conversion module. Exemplarily, the power conversion module model is LM1117-3.3.

[0060] In this embodiment, an interface conversion module is installed in the base, and the host computer is connected to the controller via the interface conversion module. Exemplarily, the model of the interface conversion module is FT232RL.

[0061] In this embodiment, an indicator light is installed on the base, and the indicator light is connected to the controller. When the host computer and the controller complete the communication connection, the indicator light lights up.

[0062] In this embodiment, in order to adapt and fix screens of different models and sizes, the positioning seat is designed as an adjustable structure. Specifically, the positioning seat includes a moving plate that slides with the base along the first horizontal direction and a positioning support block for supporting the four corners of the TFT display. The positioning support block is provided with a notch for accommodating the corners of the TFT display.

[0063] Two positioning support blocks are arranged on each movable plate, and the positioning support blocks are slidably matched with the movable plate along the second horizontal direction;

[0064] The first horizontal direction is perpendicular to the second horizontal direction.

[0065] In this embodiment, two longitudinal slide rails are symmetrically arranged on the base, and the movable plate is slidably mounted on the longitudinal slide rails;

[0066] The movable plate is provided with a transverse slide rail, and the positioning support block is slidably mounted on the transverse slide rail.

[0067] In this embodiment, the movable plate is provided with a first locking member for locking the movable plate and the longitudinal slide rail;

[0068] The positioning support block is provided with a second locking member for locking the positioning support block and the transverse slide rail.

[0069] Preferably, the first locking member and the second locking member are both locking nails.

[0070] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the application. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a restriction. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in the subsequent accompanying drawings.

[0071] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0072] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0073] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0074] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A TFT display screen Gamma voltage adjustment device, characterized in that: include: A TFT screen having a register for storing a reference Gamma voltage; Light sensor, used to obtain brightness data corresponding to different images of the TFT screen; The controller is respectively connected to the light sensor and the TFT screen for obtaining the Gamma voltage of the current screen of the TFT screen according to the brightness data, driving the TFT screen to switch the screen, and adjusting the reference Gamma voltage parameter in the register according to the Gamma voltage of the current screen; A base, a positioning seat for carrying a TFT screen is installed on the base, the light sensor is installed on the base via a bracket, the light sensor is located above the positioning seat, the controller is installed in the base, and a power-on interface, a power-on switch, a test button, and a screen connection port are provided on the base. The power-on interface, the power-on switch, and the test button are all electrically connected to the controller through wires, and the screen connection port is connected to the TFT screen via a connecting line.

2. The TFT display screen Gamma voltage adjustment device according to claim 1, characterized in that: Also includes: The host computer is connected to the controller for acquiring and storing the test data of the TFT screen. The base is provided with a communication interface, and the controller is connected to the host computer via the communication interface.

3. The TFT display screen Gamma voltage adjustment device according to claim 2, characterized in that: Also includes: The barcode scanner is connected to the host computer for scanning the label on the TFT screen to obtain the product serial number so that the host computer can bind the test data corresponding to the product serial number.

4. The TFT display screen Gamma voltage adjustment device according to claim 3, characterized in that: The label is a barcode or a QR code recording product information.

5. The TFT display screen Gamma voltage adjustment device according to claim 2, characterized in that: A power conversion module is installed in the base, and the power-on interface is connected to the controller via the power conversion module.

6. The TFT display screen Gamma voltage adjustment device according to claim 2, characterized in that: An interface conversion module is installed in the base, and the host computer is connected to the controller via the interface conversion module.

7. The TFT display screen Gamma voltage adjustment device according to claim 2, characterized in that: An indicator light is installed on the base, and the indicator light is connected to the controller. When the host computer and the controller complete the communication connection, the indicator light lights up.

8. The TFT display screen Gamma voltage adjustment device according to claim 1, characterized in that: The positioning seat comprises a movable plate that is slidably matched with the base along a first horizontal direction and a positioning support block for supporting four corners of the TFT display, wherein the positioning support block is provided with a notch for accommodating the corners of the TFT display; Two positioning support blocks are arranged on each movable plate, and the positioning support blocks are slidably matched with the movable plate along the second horizontal direction; The first horizontal direction is perpendicular to the second horizontal direction.

9. The TFT display screen Gamma voltage adjustment device according to claim 8, characterized in that: Two longitudinal slide rails are symmetrically arranged on the base, and the movable plate is slidably mounted on the longitudinal slide rails; The movable plate is provided with a transverse slide rail, and the positioning support block is slidably mounted on the transverse slide rail.

10. The TFT display screen Gamma voltage adjustment device according to claim 8, characterized in that: The movable plate is provided with a first locking member for locking the movable plate and the longitudinal slide rail; The positioning support block is provided with a second locking member for locking the positioning support block and the transverse slide rail.

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