In order to maintain the brightness of the really match, at the same time, achieve integral panel dimming, higher order provide individual cache BC LED drive, in order to achieve the overall individual point correction utility panel light. As well as point correction, brightness control is through the simulation of the dimming. The difference of the two is that point correction can be adjusted for individual leds, and brightness control multiple leds can be adjusted at the same time. Point correction and brightness control and the number of cache configuration are related to the IC.
Drive, for example, the eight LED three leds used in the group of a group of 24 channel LED drive contains 24 point correction cache (each one for individual leds), which contains three brightness control cache, each one is used for individual leds group. There are sixteen output LED driver can drive sixteen of the same color leds, which contains 16 interior point correction cache, and includes a brightness controller cache, all sixteen output can be adjusted at the same time. The mark correction and brightness control function helps to accurately control the LED brightness matching, the dimming of integral panel can be at the same time. In contains point correction and brightness control IC, LED current is defined by two cache value: set the maximum output current of the Imax is RSET, DCX is output X point revised, n is point revised figures, BC is global brightness values, m is brightness revised figures.
Accurate brightness control is just a link of the high-definition video, the second part is the right color matching. The old analog dimming device used to set the color combination of LED brightness, had a negative effect on the color quality. Color change and the relationship forward current PWM dimming can be called grayscale PWM dimming, can eliminate the LED dimming on colour change. This kind of light energy to render high quality video set the desired low brightness, maintain the correct LED color. Regardless of the brightness of LED, PWM dimming can make consistent with current through the LED, to eliminate the LED color change. Each color display pixels is composed of three leds, red, green, and blue, respectively. By simultaneously, red, green, and blue leds pulse and mixed pixels as many as sixty-eight billion seven hundred million kinds of colour can appear. The following example will illustrate the PWM dimming.

To be simple and clear, this example USES only three PWM dimming. 3 bits equal to 23 = 8 shadow colour, so each

 LED can be set to 0 ~ 7 PWM gray-scale level. At the beginning of each video frame, all leds are all put out. In the first rising edge of the PWM frequency, all leds will light up, only to 0 gray-scale values set by the LED lights up. The PWM frequency cycle begins, IC will increase the gray-scale counter. All leds will light up continuously, until the PWM PWM gray-scale counter LED more than set value. Set to four of the grey-scale values of green LED will rise in the first cycle of PWM frequency edge lights up, and after four complete PWM frequency cycle continues to light up. The three PWM dimming paradigm to the pixels generate five hundred and twelve (23 * 23 * 23) kind of colour. For 16 LED drive, can produce two hundred and eighty-one (216 * 216 * 216) kind of colour.

Use appropriate collocation point correction, brightness control and PWM dimming, the big screen's image is more perfect. So perfect design, makes the image of the masses for the big screen playing to respond, for in order to achieve brightness matching between pixels, the display brightness with ambient light conditions, mixed color to render the concern and efforts of the perfect image, etc, are quietly hidden in the dazzling fluorescent behind the scenes. Thus, the importance of LED dimming technology, LED dimming technology processing of good, for the LED display screen picture quality has a direct relationship.

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