CN116092419A - A method for automatic adjustment of LED display driver chip current gain - Google Patents

Abstract

The invention discloses an automatic current gain adjusting method for an LED display driving chip, and belongs to the field of LED display. Setting N-gear current gain adjustment, wherein N is any positive integer; setting an integer n, wherein the value range is [0, N-1]]The method comprises the steps of carrying out a first treatment on the surface of the Dividing the time of one frame of picture into 2 according to the bit number C of binary gray data ^C A number of CLK cycles; maximum gray value 2 represented by binary gray data of C bits ^C 1 is divided into N sections, and the separation values of two adjacent sections are written into a register through an upper computer; according to the interval of the gray value of the binary gray data to be displayed, automatically changing the current gain to the corresponding gear; determining the channel opening cycle number according to the interval of the gray value to be displayed, wherein the channel opening cycle number is the gray value to be displayed multiplied by a coefficient K, and the coefficients corresponding to the N-N th grade are as follows: k=2 ⁿ . The invention can improve the refresh rate when displaying the low-gray-scale picture, and improve the display effect of the low-gray-scale picture under the condition that the display brightness is kept unchanged.

Description

A method for automatic adjustment of LED display driver chip current gain

technical field

The invention relates to the technical field of LED display, in particular to a method for automatically adjusting the current gain of an LED display driving chip.

Background technique

Existing LED display driver chips generally support the current gain adjustment function, but because the current-brightness curve of LED lamps is nonlinear, simply adjusting the current gain will lead to nonlinear changes in the brightness values of different gray scale intervals, and the color will change. Rendering is distorted. Therefore, there is a need for an effective current gain adjustment method, which can set different current gains for different gray scale values, so as to ensure a constant change trend of brightness values in each gray scale interval and solve the problem of color distortion.

Contents of the invention

The purpose of the present invention is to provide a method for automatically adjusting the current gain of an LED display driver chip to solve the problems in the background technology.

In order to solve the above technical problems, the present invention provides a method for automatically adjusting the current gain of an LED display driver chip, comprising:

Step 1. Set N gears for current gain adjustment, where N is any positive integer; set an integer n, and its value range is [0, N-1];

Step 2. Divide the time of one frame into 2 ^C CLK cycles according to the number of digits C of the binary grayscale data; divide the maximum grayscale value 2 ^C −1 represented by the binary grayscale data of C bits into N pieces Interval, the separation value of two adjacent intervals is written into the register through the host computer;

Step 3. According to the interval of the gray value of the binary gray data to be displayed, automatically change the current gain to the corresponding gear;

Step 4. Determine the number of channel open cycles according to the interval of the gray value to be displayed. The number of channel open cycles is the gray value to be displayed multiplied by the coefficient K, and the coefficient corresponding to the Nnth gear is: K=2 ⁿ .

In one embodiment, the current gain corresponding to the Nnth gear is: 100% current gain × 2 ^-n , that is: the Nth gear corresponds to a 100% current gain, the N-1th gear corresponds to a 50% current gain, and the N-th gear corresponds to a 50% current gain. Level 2 corresponds to 25% current gain, and so on.

In one embodiment, the minimum gray value of the binary gray data is located in interval 1, the maximum gray value is located in interval N, and the gray value gradually increases from interval 1 to interval N.

In one embodiment, the separation value of the two adjacent intervals is determined according to the current-brightness characteristic curves of different LED lamps, and the variable interval separation value can enable the chip to support LED lamps with different current-brightness characteristic curves. , to improve the universality of the algorithm.

In one embodiment, in the step 4, the coefficient corresponding to the data whose grayscale value is in the interval N is K=2 ⁰ =1; the coefficient corresponding to the data whose grayscale value is in the interval N-1 is K=2 ¹ =2; the coefficient corresponding to the data whose gray value is in the interval N-2 is K=2 ² =2, and so on.

In one embodiment, the product of the coefficient K of the Nth gear in the step 4 and the current gain of the Nth gear is fixed at 1.

In a method for automatically adjusting the current gain of an LED display driver chip provided by the present invention, the driving current gain is automatically adjusted according to the gray value of the input gray data, and the number of channel opening cycles is changed, and the current gain is reduced in the low gray range And the method of increasing the number of channel opening cycles increases the refresh rate when displaying low-gray-scale images, and improves the display effect of low-gray-scale images while the display brightness remains unchanged.

Description of drawings

FIG. 1 is a schematic diagram of current gain gears and gray value intervals provided by the present invention.

Detailed ways

A method for automatically adjusting the current gain of an LED display driver chip proposed by the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that all the drawings are in very simplified form and use inaccurate scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

The invention provides a method for automatically adjusting the current gain of an LED display driver chip, comprising the following steps:

Step 1. Set N gear current gain adjustment, N can be any positive integer in theory; set integer n, the value range of n is [0, N-1]; the current gain corresponding to the Nth gear is: 100% current gain ×2 ^-n , that is: the Nth gear corresponds to 100% current gain, the N-1st gear corresponds to 50% current gain, the N-2nd gear corresponds to 25% current gain, and so on;

Step 2. Divide the time of one frame into 2 ^C CLK cycles according to the number of digits C of the binary grayscale data; divide the maximum grayscale value 2 ^C −1 represented by the binary grayscale data of C bits into N pieces Interval, the separation value of two adjacent intervals is written into the register through the host computer; the minimum gray value is located in interval 1, the maximum gray value is located in interval N, and the gray value gradually increases from interval 1 to interval N; wherein, the The separation value of two adjacent intervals is determined according to the current-brightness characteristic curve of different LED lamps. Using a variable interval separation value can enable the chip to support LED lamps with different current-brightness characteristic curves, which improves the universality of the algorithm;

Step 3. According to the interval of the gray value to be displayed, automatically change the current gain to the corresponding gear;

Step 4, according to the interval x where the gray value to be displayed is located, determine the number of channel opening cycles (i.e. the number of CLK cycles), the number of channel opening cycles is the gray value to be displayed multiplied by the coefficient K, and the coefficient corresponding to the Nnth gear is : K=2 ⁿ , that is: the coefficient corresponding to the data whose gray value is in the interval N is K=2 ⁰ =1; the coefficient corresponding to the data whose gray value is in the interval N-1 is K=2 ¹ =2; The coefficient corresponding to the data whose value is in the interval N-2 is K=2 ² =2, and so on, as shown in FIG. 1 .

The product of the coefficient K of the Nth gear in the step 4 and the current gain of the Nth gear is fixed at 1.

According to the gray value of the input gray data, the present invention automatically adjusts the driving current gain and changes the number of channel open cycles, and improves the display time of low gray screen by reducing the current gain and increasing the number of channel open cycles in the low gray range. With a higher refresh rate, the display effect of low-gray-scale images can be improved while the display brightness remains unchanged.

The above description is only a description of the preferred embodiments of the present invention, and does not limit the scope of the present invention. Any changes and modifications made by those of ordinary skill in the field of the present invention based on the above disclosures shall fall within the protection scope of the claims.

Claims (6)

1. A method for automatically adjusting the current gain of an LED display driver chip, characterized in that it comprises: Step 1. Set N gears for current gain adjustment, where N is any positive integer; set an integer n, and its value range is [0, N-1]; Step 2. Divide the time of one frame into 2 ^C CLK cycles according to the number of digits C of the binary grayscale data; divide the maximum grayscale value 2 ^C −1 represented by the binary grayscale data of C bits into N pieces Interval, the separation value of two adjacent intervals is written into the register through the host computer; Step 3. According to the interval of the gray value of the binary gray data to be displayed, automatically change the current gain to the corresponding gear; Step 4. Determine the number of channel open cycles according to the interval of the gray value to be displayed. The number of channel open cycles is the gray value to be displayed multiplied by the coefficient K, and the coefficient corresponding to the Nnth gear is: K=2 ⁿ . 2. The method for automatically adjusting the current gain of the LED display driver chip according to claim 1, wherein the current gain corresponding to the Nnth gear is: 100% current gain × 2 ^-n , that is: the Nth gear corresponds to 100% current Gain, gear N-1 corresponds to 50% current gain, gear N-2 corresponds to 25% current gain, and so on. 3. The LED display driver chip current gain automatic adjustment method according to claim 1, wherein the minimum gray value of the binary gray data is located in interval 1, the maximum gray value is located in interval N, and the gray value ranges from Interval 1 to interval N gradually increases. 4. The LED display driver chip current gain automatic adjustment method as claimed in claim 1, wherein the separation value of the two adjacent intervals is determined according to the current-brightness characteristic curves of different LED lamps, and a variable interval is adopted. Separated values can enable the chip to support LED lamps with different current-brightness characteristic curves, so as to improve the universality of the algorithm. 5. The LED display driver chip current gain automatic adjustment method as claimed in claim 1, characterized in that, in said step 4, the coefficient corresponding to the data whose grayscale value is located in interval N is K=2 ⁰ =1; grayscale The coefficient corresponding to the data whose value is in the interval N-1 is K=2 ¹ =2; the corresponding coefficient to the data whose gray value is in the interval N-2 is K=2 ² =2, and so on. 6. The method for automatically adjusting the current gain of the LED display driver chip according to claim 5, wherein the product of the coefficient K of the Nth gear in the step 4 and the current gain of the Nth gear is fixed at 1.

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