LED display driving device and LED display device
AssigneeLx Semicon Co., Ltd.
InventorsJin Ho Choi, Jang Su Kim, Ji Hwan Kim
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Abstract
An embodiment relates to a technique for driving an LED display. In a method of controlling grayscale of pixels dividedly by N subframes (N is a natural number of 2 or greater), a pulse width modulation (PWM) control value of each subframe may be calculated by a precalculator disposed at a front end of latches, thereby simplifying a circuit.
Claims14
An LED (light emitting diode) display driving device that controls grayscale of a pixel by distributing the grayscale to N subframes (N is a natural number of 2 or greater), the LED display driving device comprising:
- a memory configured to store grayscale values of pixels;
- a plurality of channel circuits, each configured to perform pulse width modulation (PWM) control on power supplied to each pixel according to a PWM control value;
- and
- a precalculator configured to read K grayscale values at a time (K is a natural number), to calculate PWM control values in one subframe from the grayscale values, and to forward the PWM control values to the channel circuits,
- wherein the precalculator comprises K sub-precalculators and each sub-precalculator calculates one PWM control value from one grayscale value and forwards the one PWM control value to one channel circuit.
A light emitting diode (LED) display device comprising:
- a data processing device configured to transmit image data comprising grayscale values of a plurality of pixels, each comprising an LED;
- and
- a driving device, configured to control grayscale of a pixel by distributing the grayscale to N subframes (N is a natural number of 2 or greater), comprising a memory configured to store the grayscale values of pixels, a plurality of channel circuits, each configured to perform pulse width modulation (PWM) control on power supplied to each pixel according to a PWM control value, and a precalculator configured to read K grayscale values at a time (K is a natural number), to calculate PWM control values in one subframe from the grayscale values, and to forward the PWM control values to the channel circuits
- wherein the precalculator comprises K sub-precalculators and each sub-precalculator calculates one PWM control value from one grayscale value and forwards the one PWM control value to one channel circuit.
Dependencies are inferred from the claim text.