Abstract:
A method for driving an image display device (110) comprising at least one backlight lamp (111) and a display screen (112) is described. The method comprises the steps of: receiving an image data signal (D); on the basis of the image data signal (D), calculating a content-related backlight control signal (S CL (D)) for the backlight lamp (111) for setting the intensity of the backlight; generating an average signal (S AV ) that represents a time-average of the power consumed by the backlight lamp (111); comparing the average signal (S AV ) with a reference signal (S REF ); on the basis of the calculated content-related backlight control signal (S CL (D)), taking into account the result of the said comparison, generating an actual backlight control signal (S CL (A)) for the backlight lamp (111).
Abstract translation:描述了一种用于驱动包括至少一个背光灯(111)和显示屏(112)的图像显示装置(110)的方法。 该方法包括以下步骤:接收图像数据信号(D); 基于图像数据信号(D),计算用于设置背光的强度的背光灯(111)的与内容有关的背光控制信号(S SUB CL(D)); 产生表示由背光灯(111)消耗的功率的时间平均值的平均信号(S SUB> AV); 将平均信号(S SUB)与参考信号(S SUB> REF)进行比较; 基于计算出的与内容有关的背光控制信号(S SUB CL(D)),考虑到所述比较的结果,生成实际的背光控制信号(S CL> (A))。
Abstract:
An apparatus (200) for driving a display (310, 320) including an array of display elements (20), each element (20) comprising a plurality of sub-pixels of red (R), green (G), blue (B) and white (W) colors. The apparatus (200) comprising a processor (300) operable: (a) to receive input signals (RI, GI, BI) for controlling red, green and blue colors of each element (20) of the display (320); (b) to process the input signals (RI, GI, BI) to generate corresponding red, green, blue and white output drive signals for the red (R), green (G), blue (B) and white (W) sub- pixels of each element (20), said output drive signals being enhanced according to a gain factor (HS) for increasing element luminosity subject to potential color saturation occurring at one or more of the elements (20) being addressed by selectively reducing color saturation at said one or more of said elements (20); and (c) to apply said output drive signals to respective sub-pixels (R; G, B, W) for each element (20) of the display (320).
Abstract:
This invention relates to a method for driving a display panel (DP) having pixels (P). The display panel (DP) is driven with a sequence of image frames. The image frames are converted to a drive signal (V2) comprising refresh frames with a refresh frame period (TR) shorter than the image frame period. A pixel (P) of the display panel (DP) is driven with an adapted drive signal having a first polarity during a first group of refresh frame periods, and having a reversed polarity during a subsequent second group of refresh frame periods. The first group and the second group each comprise at least two refresh frame periods.
Abstract:
The invention is related to a receiver for a television signal, such as a PAL signal, the receiver comprising a color information retrieving unit (8, 9, 11, 13) arranged to separate color information from a composite signal to retrieve color information. The receiver contains a filter (13) for selecting the decoded color signal from a plurality of signals, under control of a first value (b) of the color information from the central linerelative to second and third values (a, c) of the color information at corresponding position on further lines at an odd number of lines from the central line on a first and second, mutually opposite side of the central line respectively. An average is selected in which the first value (b) is weighed equally with information from a line or lines at an odd number of lines from the central line, when the first value (b) is more than a predetermined factor outside a range between the second and third value (a, c). A signal derived from the color information is selected in which at least no information (a, c) is weighed from the first or second side when the first value (b) is in the range or less than said factor outside the range and closer to the third or second value (a, c) respectively.
Abstract:
The invention relates to a backlighting arrangement for a light valve display device, such as an LCD-display. The backlighting arrangement comprises a number of elongated light emitting structures (9) arranged in a layer (5), extending in a plane, which structures emit light along their lengths in the direction of a light valve layer (1). An optics layer (7), comprising a number of elongated lenses (11), is placed between the light emitting structures (9) and the light valve layer (1). Each such lens (11) concentrates light emitted by a number of light emitting structures (9) onto a number of elongated areas on the light valve layer (1). Preferably, each light emitting structure (9) emits light of one primary colour only, and the elongated lenses concentrate the light emitted from each light emitting structure onto sub-pixel areas intended for a corresponding colour, so that a colour display may be provided without the use of colour filters.
Abstract:
A gamma correction circuit for correcting a digital video signal, the circuit comprising first (6) and second (8) lookup tables for storing discrete output intensity data and the associated slope data of a non-linear transfer function, respectively, for each of the discrete input video signal intensities, an adder (10) having a first input connected to the output of the first lookup table, a multiplier (12) having a first input connected to the output of the second look-up table (8), characterized by a quantizer (4) for providing the most significant bits of the incoming video signal to address the first (6) and second (8) lookup tables and to transfer the corresponding output intensity data to the adder (10) and the associated slope data to the multiplier (12), the quantizer (4) transmitting the remaining least significant bits of the input video signal to the second input of the multiplier (12), the multiplier (12) multiplying the slope data with the remaining least significant bits and feeding the multiplication result to the second input of the adder (10), the adder (10) adding the output intensity data and the multiplication result to generate a corrected video signal.
Abstract:
The invention relates to a TV-receiver 220 for receiving and decoding a broadcasted TV-signal representing an image and control data wherein the control data defines a vector indicating a location of a partition of important subject matter within said image. The invention further relates to an image display apparatus 200 and to a TV-system comprising the TV-receiver and to a method for operating the TV-receiver. It is the object of the present invention to improve a known TV-receiver 220, an image display apparatus, a TV-system and a method for displaying an image such that at least a partition of important subject matter within the original broadcasted image can entirely be shown on a screen even if the size of said screen is smaller than the size of said partition with only a minimal loss of details. This object is solved in that the control data further defines the size of said partition showing said important subject matter and that the TV-receiver 220 further comprises a re-sampling unit being adapted to extract a re-sampled image to be displayed on the screen of a display device 200 from said decoded image by re-sampling said decoded image at a variable re-sampling rate defined at the receiving end such that the size of the partition of important subject matter in the re-sampled image is adapted according to a criterion.
Abstract:
A method for displaying images on a display having backlight is disclosed, where the images is updated periodically with a period. The method comprises the steps of: generating a signal with a pulse pattern for each period depending on the contents of an image to be displayed in that period; and activating backlight in accordance with the signal. Further, a display (100) comprising a display panel (102) and a backlight unit, wherein the backlight unit comprises a controller (104) and a lighting device is disclosed. The controller (104) is arranged to generate a control signal, and the lighting device is arranged to provide backlight to the display panel (102) according to the control signal, wherein the control signal comprises a pulse pattern depending on contents of displayed images.
Abstract:
A display device (DD) comprises a light source (LS); a display panel (DP) with display pixels for modulating light originating from the light source (LS); and processing circuitry (P) coupled to the display panel (DP) and the light source (LS). The processing circuitry (P) has an input for receiving an input signal (V1) representing gray levels of pixels of an image to be displayed on the display panel (DP) and comprises: an amplifier (A) for amplifying the input signal (VI) to provide an output signal (V2) for driving the display pixels, a detector (S) for detecting whether within a part of the image a property of the output signal (V2), and - control circuitry (CM) for controlling a gain of the amplifier (A) and a brightness level of the light source (LS) in dependence on the property. The property may be that a first number of pixels of the output signal (V2) exceed a first predetermined number, wherein the first number of pixels is the number of pixels having a gray level exceeding a first predetermined gray level.
Abstract:
A scanning backlight unit (BU) for a matrix display comprises a plurality of light sources (L1, ...,Ln). A driver (2) supplies drive signals (D1, ...,Dn) to the light sources (L1, ...,Ln). A controller (3) controls the driver (2) to separately activate the light sources (L1, ...,Ln) to obtain light-emitting regions (5) being active. A light sensor (4) is associated with a group of at least two of the light sources (L1, ...,Ln) to supply a sensor signal (SES) which indicates a luminance (LU) of the group. The controller (3) reads the sensor signal (SES) at different instants (ts1, ..., tsn) at which mutually different subsets of the light sources (L1, ...,Ln) of the group are active to control the driver (2) to supply power levels to the light sources (L1, ...,Ln) of the group to obtain a luminance (LU1, ...,LUn) of each one of the light sources (L1, ...,Ln) of the group in dependence on the sensor signal (SES).