摘要:
A liquid crystal display device 100 includes thermistors 28 provided separately from light-emitting diodes 22 in an area where the light-emitting diodes 22 are arranged, and a light emission control section 201 for controlling a voltage to be applied to the light-emitting diodes 22. Based on temperature information obtained from the thermistors 28, the light emission control section 201 decreases a target value v1 of the voltage to be applied to the light-emitting diodes 22 as the temperature increases and increases the target value v1 of the voltage to be applied to the light-emitting diodes 22 as the temperature decreases.
摘要:
In a method of controlling power of a light emitting device for image display that irradiates illumination light from divided regions, light emission brightness data of each light emitting element of the light emitting device is determined based on image data for image display (S20). Power in each region and total light emission power are computed based on the light emission brightness data of each light emitting element for each region (S40). If the computed total light emission power exceeds predetermined allowable power, the power in each region is limited so that the total light emission power is equal to or less than the predetermined allowable power (S50).
摘要:
Specifically provided is a light emitting device for image display, wherein each of light emitting elements, a PWM control unit which PWM-controls a current to be supplied to the light emitting element, a control condition setting unit which, according to the APL of image data, determines and updatably sets the PWM limiting condition for limiting the PWM value that is the duty ratio of the PWM control, and the reference current value that is the value of the current flowing to the light emitting element in response to turn-on of the PWM control, and a PWM value calculation unit which on the basis of the image data, the PWM limit condition, and the reference current value, calculates the PWM value of each area, and the PWM control unit performs the PWM control on the basis of the reference current value and the calculated PWM value.
摘要:
Specifically provided is a light emitting device for image display, wherein each of light emitting elements, a PWM control unit which PWM-controls a current to be supplied to the light emitting element, a control condition setting unit which, according to the APL of image data, determines and updatably sets the PWM limiting condition for limiting the PWM value that is the duty ratio of the PWM control, and the reference current value that is the value of the current flowing to the light emitting element in response to turn-on of the PWM control, and a PWM value calculation unit which on the basis of the image data, the PWM limit condition, and the reference current value, calculates the PWM value of each area, and the PWM control unit performs the PWM control on the basis of the reference current value and the calculated PWM value.
摘要:
A micon unit (11) performs, along at least one direction within the plane of planar light, brightness correction processing for adjusting brightness distribution of the planar light on light source color video signals (RSd, Gsd and BSd) so as to change them into light source color video signals (RSd′, GSd′ and BSd′), and the micon unit (11) further calculates the total light emission power of all LEDs (52) based on the light source color video signals (RSd′, GSd′ and BSd′), and performs, when the total light emission power exceeds an allowable light emission power, light emission power correction processing on the light source color video signals (RSd′, GSd′ and BSd′).
摘要:
The light emitting device is divided into a plurality of areas, and has, as main configuration elements, an area drive circuit (2), which generates LED data and LCD data, an LED controller (4), and a backlight unit (5), which is provided with a plurality of LEDs (52) corresponding to each of the areas. The power calculating unit of the LED controller (4) is mainly configured of a power calculating circuit (42), a power limiter circuit (43), and a limit value updating circuit (45), and the emission power to be supplied to each of the LEDs (52) is calculated for each are on the basis of image data. The power calculating unit performs the calculation such that the sum (Psum) of the emission power does not exceed a power limit value (Plimit) currently set, and updates the power limit value (Plimit) by following a previously set pattern.
摘要:
Disclosed is a liquid crystal display device including: a VA-IPS mode liquid crystal display panel; a backlight unit incorporating a PWM dimming type light source; and a control unit that controls the liquid crystal display panel and the backlight unit, in which the control unit obtains response speed data of orientation change of liquid crystal molecules, and changes a duty factor of a PWM dimming signal according to the response speed data. In a case where the response speed of the liquid crystal molecules is relatively high, LEDs are driven with a relatively small duty factor. In a case where the response speed of the liquid crystal molecules is relatively low, the LEDs are driven with a relatively large duty factor, and black insertion is not performed. The liquid crystal display device prevents an image quality malfunction (multiple outlines).
摘要:
Under management by a main microcomputer, an LED controller performs, along at least two directions within a plane of planar light formed by LEDs arranged in a matrix, brightness correction processing for adjusting the distribution of brightness of the planar light on light source color video signals to convert them into light source color video signals.
摘要:
An image display apparatus comprising: a driver apparatus; and a total of N device groups of a first group to an N-th group (2≦N) each of which includes one or a plurality of light emitting devices, the image display apparatus uses the driver apparatus to make each of the device groups emit light preventing light emission capable periods from overlapping one another and displays an image by using the obtained light as backlight; wherein the driver apparatus includes: a power output circuit that outputs light emission power used for the light emission of the light emitting device; and a switch mechanism that switches, in accordance with arrival of the light emission capable period of a device group K (1≦K≦N), an output destination of the light emission power output from the power output circuit to the device group K.
摘要:
Disclosed is a backlight unit (16) for supplying backlight to a liquid crystal panel (15a), the backlight unit being provided with a plurality of LEDs (16b) that function as a light source of the backlight, and an LED driver (5) that comprises a plurality of control channels (1-12 ch) to each of which one or more of the LEDs are connected, and that PWM-controls lighting of the connected LEDs. The LED driver (5) can set the frequency or phase of the PWM control independently for each of the control channels (1-12 ch). Consequently, the flexibility of control of LEDs can be increased while the number of necessary LED drivers is reduced to a minimum.