EP2633511A1

EP2633511A1 - Device for actuating a display having a view angle dependent representation of different images and display comprising such a device

Info

Publication number: EP2633511A1
Application number: EP11770080.7A
Authority: EP
Inventors: Markus Lindner; Kitamura Kotaro
Original assignee: Robert Bosch GmbH; Epson Imaging Devices Corp
Current assignee: Robert Bosch GmbH; Epson Imaging Devices Corp
Priority date: 2010-10-27
Filing date: 2011-10-05
Publication date: 2013-09-04
Also published as: WO2012055683A1; CN103443842B; CN103443842A; DE102010043005A1

Abstract

The invention relates to a device (1) for actuating a display (7), which can provide a viewer with two different image contents from different viewing directions and has image points arranged in lines and columns, comprising a processor (7), an actuating unit (3, 6) for the display, and a correction system (5) having a storage unit, wherein correction means for a brightness correction of an image point depending on the brightness of a neighboring image point are implemented in the storage unit. According to the invention, temperature detection means (4) for detecting the temperature in the region of the display (7) and forwarding means for forwarding a temperature value to the correction installation are provided. The correction installation (5) is designed to correct the brightness of an image point depending on the temperature in the region of the display (7).

Description

description

title

DEVICE FOR CONTROLLING AN INDICATION OF AN INDICATIVE ILLUSTRATION OF DIFFERENT IMAGES AND DISPLAY WITH SUCH A DEVICE

State of the art

From the prior art so-called DualView displays in the automotive and automotive supply industry are known. A DualView display can be one

Viewers from different perspectives provide two different image content. This technique therefore makes it possible for a passenger to display moving pictures (DVD, video, TV) which are not visible to a driver and, because of the legal situation, may not be visible.

So that a clear separation of image content for z. B. a driver and a passenger is possible, efforts are made, in particular to avoid crosstalk optical and / or electrical nature of a passenger image on a driver's image or vice versa. The suppression of crosstalk also improves the overall image quality of a DualView display, since image content on one side does not disturb the other side.

For interference suppression z. For example, correcting a data content for a pixel based on the data content of its neighboring pixel via correction tables. A correction can also affect subpixels, called subpixels of a

Obtain color pixel or color pixels, wherein the color pixel subpixels for z. B. includes the colors red, green and blue.

Correction tables regularly hold a correction value for each brightness value of the pixel to be corrected with respect to a brightness value of a neighboring subpixel. Such correction tables are usually in hardware, FPGA (Field

Programmable Gate Array) or ASIC (Application Specific Integrated Circuit) are realized and are generally combined with a controller for the display or the display.

Disclosure of the invention

The invention is based on the object to provide a device for driving a display, in which an improved compensation of

Crosstalk artifacts is possible.

This object is solved by the features of claims 1 and 12. In the dependent claims advantageous and expedient developments of the invention are given.

The invention is based on a device for controlling a display, which can provide a viewer with two different image contents from two different viewing directions and has line-and column-shaped pixels, comprising a computer unit, a drive unit for the display and a correction device with a memory unit in the storage unit

Correction means for a brightness correction of a pixel in dependence on the brightness of an adjacent pixel are formed.

The essence of the invention lies in the fact that temperature detection means are provided for detecting the temperature in the region of the display and relaying means for transmitting a temperature value to the correction device, and in that the

Correction device is designed for a brightness correction of a pixel as a function of the temperature in the region of the display. The invention makes use of the knowledge that the crosstalk from pixel to pixel

is temperature dependent. Without a temperature-controlled correction, especially at low temperatures, a strong crosstalk of the image of a viewing direction to the image of the other viewing direction, although a conventional brightness correction occur.

Preferably, correction values for a brightness correction of a pixel are stored in a correction table. Depending on the temperature, parts of the correction device can be bypassed or, for example, by another, modified one Replace correction table, especially partial correction table. This is already effective, since it has been recognized in the invention that only a part of correction data has to be adapted via the temperature.

This also has the advantage that although a temperature consideration in the correction is not approximately a duplication of correction data and thus of

Memory is required, but an increase in memory requirements, if any, only a part of the original storage requirements. This scarce hardware resources are used sparingly in a control device such as space.

For an optimized use of resources at storage space, it is proposed that the correction device is designed to determine a correction value by means of a correction table, in particular in the sense of an assignment table or lookup table, depending on a measured temperature of the temperature detection means and on a brightness value of a pixel to be corrected. Thus, in principle, a structure is conceivable in which below a temperature threshold only for a part of brightness values a correction takes place and the others

Brightness values can not be corrected. Such a solution can in principle manage without additional expenditure with regard to a storage space size.

An improvement of the image quality can be achieved if all brightness values are corrected in principle.

The correction device and / or the input device can be realized with, for example, a field-programmable gate component (FPGA).

Preferably, the temperature of the temperature detecting means via a

Interface, e.g. B. transmitted an SPI interface to the FPGA.

However, it is also conceivable that a temperature sensor on a circuit board together with the FPGA and / or the computer unit, for. B. is a microcontroller.

In order to be able to detect the display temperature, which ultimately matters, with particular accuracy, it is also proposed that a temperature sensor be arranged on the display. In a further preferred embodiment of the invention, the correction device for correcting a brightness value of a pixel to the brightness value of this pixel to a row address of a correction table and the brightness value of an adjacent pixel to a column address or vice versa and reads a correction value for a control at the addressed position.

Conceivable are several correction tables for several temperature thresholds and / or different crosstalk causes.

drawings

Several embodiments of the invention are illustrated in the figures and are explained in more detail below, giving further details and advantages.

FIG. 1 shows a schematic block diagram of a

Control device with temperature correction for a DualView display,

Figure 2 is a flow chart for a crosstalk correction;

Figures 3 and 4 show two further embodiments of a

Crosstalk correction in the form of a flowchart.

The exemplary embodiment of a device for driving a display 1 according to FIG. 1 comprises a microcontroller 2, an FPGA 3 and a temperature sensor 4.

The temperature sensor 4 is connected to the microcontroller 2. The FPGA module 3 contains a circuit block 5 for the correction of image data and a circuit block 6 for controlling a DualView display 8. The microcontroller 2 is connected via an interface 8 to the FPGA 3, via which the temperature is transmitted to the FPGA and there is evaluated by the correction block 5.

A correction of supplied video data (box 17) can proceed in accordance with the flowchart according to FIG.

For a brightness value Y to be corrected, regardless of the value, first Checks whether the temperature on the display or in the area of the display is greater than a predetermined threshold Thr. This is illustrated by a decision box 9. If the temperature is above the predetermined threshold temperature, a correction takes place in a correction table 11 according to branch y. If the temperature is below the predetermined threshold temperature, branching takes place in direction n. Now a decision is made on the basis of the brightness value Y (see

Decision box 10). If the brightness value Y is above a predetermined value, a correction takes place (branch y). If, on the other hand, the brightness value is smaller than the specified threshold value, no correction takes place (branch n). In this case, the original brightness value for the control of a display 7 is used.

About the correction table 11, the correction can run by a

Brightness value Y1 of a pixel as a function of the brightness value Y of the

adjacent pixels a correction value ΔΥ is added or subtracted. For this purpose, the brightness value Y1 of the pixel can be applied to a row address z in the correction table 1 1 and the brightness value Y2 of the neighboring pixel to a column address s, after which the correction value is read out at an addressed position and displayed in the display for driving the pixel which has been corrected 7 is used.

In a correction according to the flowchart of Figure 2, a correction of the brightness value is not made when the temperature of the display is below a predetermined threshold Thr and also the brightness value Y falls below a predetermined value. Therefore, no correction data is required for such combinations, as a result of which the memory space for the correction table 11 can remain small.

Optionally, no additional storage space is required in an FPGA compared to a conventional correction. However, by eliminating the correction of some brightness value combinations below a predetermined temperature worse than above the temperature threshold, for example at room temperature.

An improvement in quality can be achieved by taking the below

Threshold temperature Thr and at a brightness value below a predetermined value via an additional table 12 yet a correction takes place (see Figure 3).

An improvement in the correction can be achieved if an even more refined Decision based on the brightness value and / or of temperature thresholds, which illustrates the structure of Figure 4. In this case too, as in FIG. 3, all brightness values are fundamentally corrected, but in the decision below a certain brightness value, a differentiation takes place on the basis of the display temperature. In FIG. 4, two further temperature thresholds T1 and T2 are introduced in the decision boxes 15 and 16, which then branch to correction tables 13 and 14.

As can be seen from Figures 2 to 4, many different structures of the correction with different correction tables are conceivable, with different

Crosstalk causes can be received.

In the foreground, however, is a temperature-dependent correction for at least some of the pixels.

Claims

claims

1. Device (1) for controlling a display (7), which can provide a viewer from different viewing directions two different image content and has line and column-shaped pixels, comprising a computer unit (2), a drive unit (3, 6) for the Display (7) and a correction device (5) with a memory unit, wherein in the memory unit correcting means for a brightness correction of a pixel depending on the brightness of an adjacent pixel are realized, characterized in that temperature detecting means (4) for detecting the temperature in the Display and relay means (8) for passing a temperature value to the correction means (5) are provided, and that the correction means (5) is designed for the brightness correction of a pixel as a function of the temperature in the region of the display.

2. Apparatus according to claim 1, characterized in that correction values for a brightness correction of a pixel in a correction table (11, 12, 13, 14) are stored.

3. Device according to one of the preceding claims, characterized in that the correction device (5) is formed, depending on a measured temperature (T) of the temperature detection means and a brightness value (Y) of a pixel to be corrected a correction value by means of a correction table (11, 12, 13, 14).

4. Device according to one of the preceding claims, characterized in that the correction device (5) in an FPGA (3) is realized.

5. Device according to one of the preceding claims, characterized in that the drive means (6) for the display in an FPGA (3) is realized.

6. Device according to one of the preceding claims, characterized in that the temperature data (T) via an interface (8) to the FPGA (3) can be transmitted.

7. Device according to one of the preceding claims, characterized in that a temperature sensor (4) on a circuit board with an FPGA (3) and / or the computer unit (2).

8. Device according to one of the preceding claims, characterized in that a temperature sensor (4) is arranged on the display.

9. Device according to one of the preceding claims, characterized in that the correction device (5) for correcting a brightness value (Y) of a pixel, the brightness value (Y) of this pixel to a row address (z) a correction table (1 1, 12, 13, 14) and reads out the brightness value (Y) of an adjacent pixel to a column address (s) of the correction table (11, 12, 13, 14) or vice versa and a correction value for a drive at the addressed position.

10. Device according to one of the preceding claims, characterized in that a correction below a predetermined temperature threshold (Thr) and below a predetermined brightness value does not take place.

1 1. Device according to one of the preceding claims, characterized in that a correction for all brightness values (Y) of pixels takes place.

12. Display with a device according to one of the preceding claims.