Image processing circuit and light illumination module
An image processing circuit and a light illumination module are provided. The light illumination module has an integrated circuit and a plurality of light emitting diode (LED) strings connected in parallel. The integrated circuit could be the image processing circuit. Each of the LED strings has a plurality of LEDs connected in series. The integrated circuit has a driving circuit coupled to the LED strings. The driving circuit supplies a driving voltage to first ends of the LED strings to drive the LED strings. The driving circuit is also configured to maintain a voltage value of the driving voltage obtained while all of the strings of the light emitting diodes are turned on, until all of the LED strings are turned on again. Accordingly, the interference of the LED strings is decreased, and the LED strings operate more stably.
1. A light illumination module, comprising:
a plurality of light emitting diode (LED) strings connected in parallel, wherein each of the LED strings comprises a plurality of light emitting diodes (LEDs) connected in series; and
an integrated circuit, comprising:
a driving circuit, coupled to the LED strings, and supplying a driving voltage to first ends of the LED strings to drive the LED strings, wherein the driving circuit is configured to obtain a voltage value of the driving voltage when all of the LED strings are turned on and to maintain the voltage value of the driving voltage until all of the LED strings are turned on again.
2. The light illumination module as claimed in claim 1 , wherein the integrated circuit further comprises:
a scaler, coupled to the driving circuit, and processing an image signal to generate and output a control signal to the driving circuit, wherein the driving circuit controls operations of the LED strings according to the control signal.
3. The light illumination module as claimed in claim 2 , wherein the scaler converts a resolution of the image signal from a first resolution to a second resolution.
4. The light illumination module as claimed in claim 2 , wherein the scaler comprises:
a register, storing data,
wherein when the driving circuit detects operation abnormity of the LED strings, the driving circuit stores abnormal information of the LED strings to the register.
5. The light illumination module as claimed in claim 2 , wherein when the driving circuit detects the operation abnormity of the LED strings, the driving circuit turns off the LED strings, and the scaler continually operates.
6. The light illumination module as claimed in claim 2 , wherein the scaler comprises:
a reference voltage circuit, providing a reference voltage to the driving circuit, wherein the driving circuit generates the driving voltage according to the reference voltage.
7. The light illumination module as claimed in claim 2 , wherein the driving circuit controls a duty cycle of each of the LED strings according to the control signal.
8. The light illumination module as claimed in claim 2 , wherein the integrated circuit is a single chip.
9. The light illumination module as claimed in claim 1 , wherein the driving circuit comprises:
a sampling circuit, sampling voltages of second ends of the LED strings when all of the LED strings are turned on, and generating a control voltage according to the sampled voltages; and
a pulse width modulation (PWM) circuit, controlling the voltage value of the driving voltage according to the control voltage.
10. The light illumination module as claimed in claim 1 , wherein the light illumination module is used for providing a backlight for a liquid crystal display (LCD).
11. An image processing circuit, adapted to drive a plurality of light emitting diode (LED) strings, the image processing circuit comprising:
a driving circuit, coupled to the LED strings, and supplying a driving voltage to first ends of the LED strings to drive the LED strings, wherein the driving circuit is configured to obtain a voltage value of the driving voltage when all of the LED strings are turned on and to maintain the voltage value of the driving voltage until all of the LED strings are turned on again.
12. The image processing circuit as claimed in claim 11 , further comprising:
a scaler, coupled to the driving circuit, and processing an image signal to generate and output a control signal to the driving circuit, wherein the driving circuit controls operations of the LED strings according to the control signal.
13. The image processing circuit as claimed in claim 12 , wherein the scaler converts a resolution of the image signal from a first resolution to a second resolution.
14. The image processing circuit as claimed in claim 12 , wherein the scaler comprises:
a register, storing data,
wherein when the driving circuit detects operation abnormity of the LED strings, the driving circuit stores abnormal information of the LED strings to the register.
15. The image processing circuit as claimed in claim 11 , wherein the driving circuit comprises:
a sampling circuit, sampling voltages of second ends of the LED strings when all of the LED strings are turned on, and generating a control voltage according to the sampled voltages; and
a pulse width modulation (PWM) circuit, controlling the voltage value of the driving voltage according to the control voltage.